Sensor shell air tightness detection tool

Abstract

The utility model relates to a sensor housing air tightness detection tool, which comprises a support, the support is provided with a positioning part, a first pressing mechanism and a second pressing mechanism, the positioning part is used for placing a sensor housing to be detected, and the first pressing mechanism comprises a first sealing stopper rod which is used for being inserted into a first blind hole of the sensor housing; the second pressing mechanism comprises a second sealing stopper rod used for being inserted into a second blind hole of the sensor shell, an air inlet channel is formed in the second sealing stopper rod, one end of the air inlet channel is located in the first blind hole, and the other end of the air inlet channel is used for being connected with a high-pressure gas pipeline. By means of the tool, the air tightness of the sensor shell can be conveniently detected, detection can be completed before the oil pipe is installed, even if the sensor shell is detected to be unqualified, other parts cannot be scrapped, the detection efficiency is improved, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor detection, in particular to a sensor housing air tightness detection tool. Background Art

[0002] The liquid level of the LNG cylinder is measured by installing a capacitive liquid level sensor on the LNG cylinder. The capacitive liquid level sensor generally includes the tube body part and the end part of the inner and outer tubes. The end part is used to install the processing chip, etc. The end part also transmits data to the display screen through a cable to facilitate the understanding of the liquid level of the cylinder. The measurement principle of the capacitive liquid level sensor is relatively mature. There are some differences in structure between the sensors made by different manufacturers. You can refer to one of them, such as the shell structure of a capacitive liquid level sensor for LNG cylinders disclosed in the authorization announcement number CN209027627U. Although the end part of the capacitive liquid level sensor can achieve the sealing of the original processed holes and grooves through the sealing structure at the threading point, the end part itself may also have the problem of poor airtightness. For example, if the shell of the end part is cast in one piece of aluminum alloy, there may be defects such as sand holes. In actual use, the oil and gas in the LNG cylinder may leak, which does not meet the requirements of environmental protection departments. Therefore, it is necessary to perform air tightness test on the end part. The existing method is to measure after the measuring liquid tube is installed on the end. If the shell has an air tightness problem, the measuring tube cannot be reused, which increases the manufacturer's cost. Utility Model Content

[0003] The utility model aims to provide a sensor housing air tightness detection tool, which can directly perform air tightness detection on the sensor housing.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The sensor housing air tightness detection tool comprises a bracket, on which a positioning portion, a first clamping mechanism and a second clamping mechanism are provided. The positioning portion is for placing the sensor housing to be tested. The first clamping mechanism comprises a first sealing plug rod for inserting into the first blind hole of the sensor housing; the second clamping mechanism comprises a second sealing plug rod for inserting into the second blind hole of the sensor housing. The second sealing plug rod is provided with an air inlet channel, one end of the air inlet channel is located in the first blind hole, and the other end is used to connect to a high-pressure gas pipeline.

[0006] Furthermore, the first pressing mechanism comprises a first driving rod arranged horizontally, the first sealing stopper rod is arranged at one end of the first driving rod, and the first sealing stopper rod is an elastic rod.

[0007] Furthermore, the other end of the first driving rod is connected to a manual tightener, and a base of the manual tightener is fixed on the bracket.

[0008] Furthermore, the second pressing mechanism comprises a cylinder for driving the second sealing stopper rod, the second sealing stopper rod is arranged vertically, and a cylinder body of the cylinder is fixed on the bracket.

[0009] Furthermore, the second sealing plug rod comprises an inner core and an outer sleeve, the outer sleeve is an elastic sleeve, the inner core is hollow to allow gas to pass through, and the outer sleeve is provided with an air inlet hole to form the air inlet channel with the inner core.

[0010] Furthermore, the high-pressure gas pipeline includes a gas tank and a gas pipe, and the gas pipe is connected to a pressure gauge.

[0011] Furthermore, the positioning portion is a positioning groove composed of a semicircular groove and a rectangular groove, and the semicircular groove is adapted to the circumference of the sensor housing.

[0012] Furthermore, a limit frame is provided on the bracket, and the limit frame is located outside the positioning groove. The limit frame is for the sensor housing to be placed in, and limits the sensor housing when the first clamping mechanism applies force to the sensor housing.

[0013] Beneficial effects of the utility model:

[0014] When in use, the sensor housing to be tested is installed on the positioning part of the bracket, and the first blind hole of the sensor housing is initially positioned toward the first sealing plug rod of the first clamping mechanism, and the second blind hole is toward the second sealing plug rod of the second clamping mechanism. First, the first clamping mechanism is used to operate so that the first sealing plug rod is inserted into the first blind hole, and the sensor housing is positioned again. Then, the second sealing plug rod of the second clamping mechanism is inserted downward into the second blind hole. The first blind hole and the second blind hole are both blocked, and then it is possible to detect whether the cavity therein is leaking. The high-pressure gas pipeline is used to supply gas to the air inlet channel of the second sealing plug rod. After the cavity to be tested is filled with a certain pressure gas, this state is maintained, and then the air tightness of the sensor housing is judged by observing whether the pressure value of the pressure gauge changes or by putting the tooling into the water tank to observe whether there are bubbles. Using this tooling, the air tightness of the sensor housing can be easily detected, and the detection can be completed before the oil pipe is installed. Even if the sensor housing fails the detection, other parts will not be scrapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the air tightness detection tooling of the sensor housing of the utility model;

[0016] Figure 2 It is a cross-sectional view of the air tightness detection tooling of the sensor housing of the utility model;

[0017] Figure 3 is a stereogram of a sensor housing to be tested;

[0018] Figure 4 It is a schematic diagram of the sensor housing after being placed in the sensor housing air tightness detection tooling.

[0019] 1. Bracket; 11. Vertical support plate; 12. Positioning part; 121. Semicircular groove; 13. Limiting frame; 2. First clamping mechanism; 21. First sealing plug rod; 22. First driving rod; 23. Bushing; 24. Handle; 25. Base; 26. First connecting rod; 31. Second sealing plug rod; 311. Air hole; 312. Inner core; 32. Cylinder; 4. Sensor housing; 41. First blind hole; 42. Second blind hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0021] Embodiments of the present utility model:

[0022] like Figure 1-Figure 4 As shown, the sensor housing air tightness detection tool includes a bracket 1, on which a positioning portion 12, a first clamping mechanism 2, and a second clamping mechanism are provided. The positioning portion 12 is used to place the sensor housing 4 to be tested, and has a certain positioning effect on it. The first clamping mechanism 2 includes a first sealing plug rod 21, which is used to be inserted into the first blind hole 41 of the sensor housing 4; the second clamping mechanism includes a second sealing plug rod 31, which is used to be inserted into the second blind hole 42 of the sensor housing 4. The first blind hole 41 and the second blind hole 42 are connected, and the connected cavity area is to be tested to detect whether there is air leakage through the cavity wall. The second sealing plug rod 31 is provided with an air inlet channel, and the air inlet channel is passed by external high-pressure gas (which can be slightly greater than the oil and gas pressure in the LNG cylinder).

[0023] like Figure 1As shown, the first clamping mechanism 2 includes a first driving rod 22 arranged horizontally, and a first sealing plug rod 21 is arranged at one end of the first driving rod 22. The first sealing plug rod 21 adopts an elastic rod, preferably a silicone rod, which has a certain elasticity and a certain taper on the outer peripheral surface, so that sealing is achieved after being inserted into the first blind hole 41. The other end of the first driving rod 22 is connected to a manual clamp, and the base 25 of the manual clamp is fixed on the bracket 1. The principle of the manual clamp is the existing technology. The manual clamp includes a base 25, a sleeve 23, a first connecting rod 26, and a handle 24. The sleeve 23 is for the first driving rod 22 to pass through and guide it, so that the first driving rod 22 moves in a straight line. The two ends of the first connecting rod 26 are respectively hinged to the bottom of the first driving rod 22 and the handle 24, and the bottom of the handle 24 is also hinged to the base 25 at another point. Figure 1 In the embodiment, the handle 24 is in a vertical state and the manual tightener is in a tightened state.

[0024] like Figure 1 , Figure 2 As shown, the second clamping mechanism includes a cylinder 32 for driving the second sealing plug rod 31. The second sealing plug rod 31 is vertically arranged, and the cylinder body of the cylinder 32 is fixed on the bracket 1. The second sealing plug rod 31 includes an inner core 312 and an outer sleeve. The outer sleeve adopts a silicone sleeve, and the inner core 312 is hollow to allow gas to pass through. An air inlet hole 311 is provided on the outer sleeve, forming an air inlet channel with the inner core 312. The inner core 312 adopts a rigid material such as stainless steel to prevent it from being squeezed and flattened by the entire silicone material to affect the air intake. The lower section of the second sealing plug rod 31 is also tapered, and the elastic characteristics of the outer silicone sleeve are used to achieve the effect of sealing and matching with the second blind hole 42. The second sealing plug rod 31 is driven by the cylinder 32 and moves in the vertical direction. In other embodiments, the second clamping mechanism can also adopt a manual clamping method similar to the first clamping mechanism 2.

[0025] When in use, one end of the air inlet passage is located in the first blind hole 41, and the other end is connected to the high-pressure gas pipeline through the air inlet hole 311. The high-pressure gas pipeline includes a gas tank and an air pipe, and a pressure gauge is connected to the air pipe. One end of the air pipe is connected to the air release valve of the gas tank, and the other end is connected to the air inlet hole 311 of the second sealing plug rod 31 through a quick connector.

[0026] The positioning portion 12 is arranged on the vertical support plate 11 of the bracket 1, and is a positioning groove composed of a semicircular groove 121 and a rectangular groove. The semicircular groove 121 is adapted to the circumference of the sensor housing 4. When the sensor housing 4 to be tested is installed, it is first pre-positioned by the positioning portion 12. The bracket 1 is also provided with a limit frame 13, which is located outside the positioning groove. The limit frame 13 is for the sensor housing 4 to be placed, and limits the sensor housing 4 when the first clamping mechanism 2 applies force to the sensor housing 4. The vertical support plate 11 is provided with a through hole, which can allow the first sealing plug rod 21 to pass through.

[0027] The use principle of the air tightness detection tooling of the sensor housing 4:

[0028] Before the test, the sealing plug rods of the first clamping mechanism 2 and the second clamping mechanism are both in a position far away from the test point. The sensor housing 4 to be tested is placed on the positioning portion 12 on the bracket 1, and the circumference of the sensor housing 4 is aligned with the positioning notch of the positioning portion 12, the second blind hole 42 faces upward, and the first blind hole 41 faces the first clamping mechanism 2. The sensor housing 4 is placed in the positioning portion 12 through the U-shaped limit frame 13. After being placed, there is an appropriate gap between the limit frame 13 and the sensor housing 4. The handle 24 of the first clamping mechanism 2 is manually moved to insert the first sealing plug rod 21 into the first blind hole 41, and then the cylinder 32 is actuated (can be controlled by a manual button), driving the second sealing plug rod 31 to be inserted downward into the second blind hole 42. At this time, the first blind hole 41 and the second blind hole 42 are both blocked, and it can be detected whether the cavity therein is leaking. Open the vent valve of the gas tank and observe the pressure gauge value. After the gas pipe is filled with a certain pressure gas, close the vent valve, and then observe whether the pressure value of the pressure gauge changes after a certain period of time. If there is a leak, the value of the pressure gauge will drop significantly. The tooling can be used to conveniently detect the air tightness of the sensor housing 4. The detection can be completed before installing the oil pipe. Even if the sensor housing 4 fails the detection, it will not cause other parts to be scrapped.

[0029] In other embodiments, the bubble observation method can also be used. After a certain pressure gas is introduced into the cavity between the first blind hole and the second blind hole, the tooling can be placed in a water tank with the water level submerging the sensor housing. Whether the sensor housing is leaking can be determined by observing whether there are bubbles.

Claims

1. Sensor housing air tightness detection tooling, characterized by: It includes a bracket, on which are provided a positioning portion, a first clamping mechanism, and a second clamping mechanism. The positioning portion is for placing a sensor housing to be tested. The first clamping mechanism includes a first sealing plug rod for inserting into a first blind hole of the sensor housing; the second clamping mechanism includes a second sealing plug rod for inserting into a second blind hole of the sensor housing. The second sealing plug rod is provided with an air intake channel, one end of the air intake channel is located in the first blind hole, and the other end is used to connect to a high-pressure gas pipeline.

2. The sensor housing air tightness detection tool according to claim 1, characterized in that: The first pressing mechanism comprises a first driving rod arranged horizontally, the first sealing plug rod is arranged at one end of the first driving rod, and the first sealing plug rod is an elastic rod.

3. The sensor housing air tightness detection tool according to claim 2, characterized in that: The other end of the first driving rod is connected to a manual tightener, and a base of the manual tightener is fixed on the bracket.

4. The sensor housing air tightness detection tool according to claim 1, characterized in that: The second pressing mechanism comprises a cylinder for driving the second sealing stopper rod. The second sealing stopper rod is arranged vertically, and a cylinder body of the cylinder is fixed on the bracket.

5. The sensor housing air tightness detection tool according to claim 4, characterized in that: The second sealing plug rod comprises an inner core and an outer sleeve, the outer sleeve is an elastic sleeve, the inner core is hollow to allow gas to pass through, and the outer sleeve is provided with an air inlet hole to form the air inlet channel with the inner core.

6. The sensor housing air tightness detection tool according to claim 1, characterized in that: The high-pressure gas pipeline comprises a gas tank and a gas pipe, and the gas pipe is connected with a pressure gauge.

7. The sensor housing air tightness detection tool according to any one of claims 1 to 6, characterized in that: The positioning portion is a positioning groove composed of a semicircular groove and a rectangular groove, and the semicircular groove is adapted to the circumference of the sensor housing.

8. The sensor housing air tightness detection tool according to claim 7, characterized in that: The bracket is also provided with a limiting frame, which is located outside the positioning groove. The limiting frame is for the sensor housing to be placed in, and limits the sensor housing when the first pressing mechanism applies force to the sensor housing.

Images