Electron tube assembly assembly structure of liquid level sensor

Abstract

The utility model provides a kind of electronic tube subassembly assembly structure of liquid level sensor, including sensor head, electronic tube and PP pipe, it is equipped with the communicating hole, electronic passage and electronic tube mounting hole that are sequentially communicated in sensor head, and the inner side wall of electronic passage is equipped with recess;The top of electronic tube is installed in electronic tube mounting hole, and the inside of electronic tube is equipped with the accommodation channel that is communicated with electronic passage;The top of PP pipe is equipped with rubber plug, and the bottom of PP pipe sequentially passes through communicating hole, electronic passage and inserts into accommodation channel, and drive rubber plug to be tightly passed through electronic passage and insert into accommodation channel inside.The utility model is by recess in the inner side wall of electronic passage, recess can be used as gas buffer and pressure relief space, recess is communicated with outside by electronic passage, so that the gas of extrusion can be discharged outward through recess, to release the pressure of compressed gas, avoid excessive increase of gas pressure in passage, greatly reduce the probability of occurrence of "trapped gas rebound floating" phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to an assembly structure of an electron tube component for a liquid level sensor. Background Technology

[0002] In the manufacturing of liquid level sensors, the electron tube assembly, as one of the core components, directly determines the sensor's detection accuracy and product yield through the rationality of its assembly structure. Currently, commonly used liquid level sensor electron tube assemblies on the market generally suffer from two major defects in both assembly design and practical application, as follows: Firstly, to prevent glue from seeping into the electron tube and damaging the core circuitry during assembly, existing structures typically design the rubber plug at the top of the PP tube (polypropylene tube) of the electron tube assembly, and the channel housing the assembly (which consists of the electronic channel of the sensor head and the internal channel of the electron tube connected sequentially), as a compression-sealed structure. This seal is achieved through the physical compression of the rubber plug. However, this design causes serious air entrapment problems in actual assembly: during assembly, the electron tube and sensor head must be pre-installed first, then the internal integrated circuit board and the PP tube with the rubber plug at the top are inserted through the connecting hole in the sensor head, pass through the electronic channel of the sensor head, and finally enter the internal channel of the electron tube; subsequently, glue must be applied to the designated dispensing area for sealing, and finally the encapsulation board is installed. However, from the moment the rubber stopper at the top of the PP tube enters the channel, it directly seals and compresses the gas within the electronic channel. As the assembly depth of the PP tube increases, the gas inside the electronic channel is continuously compressed, causing a sharp increase in gas density. This compressed gas eventually seeps into the gap between the PP tube and the electronic tube (after final assembly, the rubber stopper is located inside the electronic tube), resulting in a significantly higher gas pressure within this gap compared to the external pressure. When the gas pressure reaches a certain threshold, the rubber stopper experiences a "trapped gas rebound and rise" phenomenon due to the upward thrust of the gas. This rise of the rubber stopper directly alters the reference position for liquid level detection, causing inaccurate liquid level data and leading to a persistently high rate of product assembly defects. A large number of defective products require rework, increasing not only labor and material costs but also raising the risk of customer complaints due to poor product quality stability.

[0003] Secondly, when the rubber stopper is assembled too deeply, the aforementioned problem of "trapped gas rebounding and floating" will be further aggravated: a deeper assembly depth means that the gas in the electronic channel is compressed for a longer distance and with a greater amount of compression. The gas pressure in the gap between the PP tube and the electronic tube is higher, and the rubber stopper is subjected to a stronger upward thrust. The probability and magnitude of floating are significantly increased, resulting in a higher product defect rate. This also requires a large amount of rework, further increasing production costs. At the same time, the continuous quality problems also damage the product's market reputation and exacerbate the risk of customer complaints.

[0004] Therefore, it is necessary to provide at least one electron tube assembly structure for a liquid level sensor to reduce the probability of "trapped gas rebounding and floating" phenomenon, thereby improving product assembly yield, reducing production costs, and avoiding customer complaint risks. Utility Model Content

[0005] The purpose of this invention is to provide an assembly structure for the electron tube component of a liquid level sensor to reduce the probability of "trapped gas rebounding and floating" phenomenon, thereby improving product assembly yield, reducing production costs, and avoiding customer complaint risks.

[0006] To achieve the above objectives, this utility model provides an assembly structure for an electron tube component of a liquid level sensor, including a sensor head, an electron tube, and a PP tube. The sensor head has a connecting hole, an electron channel, and an electron tube mounting hole that are sequentially connected. The inner sidewall of the electron channel has a groove. The top of the electron tube is installed in the electron tube mounting hole, and the inside of the electron tube has a receiving channel that communicates with the electron channel. The top of the PP tube has a rubber stopper, and the bottom of the PP tube passes through the connecting hole and the electron channel in sequence and is inserted into the receiving channel, thereby causing the rubber stopper to pass tightly through the electron channel and be inserted into the receiving channel.

[0007] Preferably, the groove is arranged on the inner wall of the electronic channel along the length direction of the electronic channel. Preferably, a plurality of the grooves are arranged at intervals on the inner wall of the electronic channel along the circumferential direction of the electronic channel. Preferably, a stepped structure is formed between the groove and the inner wall of the electronic channel. Preferably, a dispensing area for dispensing adhesive is formed between the electronic channel and the top of the rubber stopper. Preferably, the electron tube assembly structure of the liquid level sensor further includes a sealing bushing assembly, which is sleeved on the top of the electron tube and used to seal between the electron tube and the inner wall of the electron tube mounting hole. Preferably, the sealing bushing assembly includes a bushing cap, a sealing ring, and a bushing sequentially fitted onto the electron tube along the axial direction of the electron tube, wherein the bushing cap, the sealing ring, and the bushing are all located within the electron tube mounting hole, the bushing cap is fitted onto the top end face of the electron tube, and the sealing ring seals between the electron tube and the inner sidewall of the electron tube mounting hole. Preferably, the distance between the rubber stopper and the top end face of the electron tube is 2 mm. Preferably, the PP tube has a circuit board inside. Preferably, the electron tube assembly structure of the liquid level sensor further includes an encapsulation plate, and the top surface of the sensor head is provided with an encapsulation groove communicating with the communication hole, and the encapsulation plate is encapsulated in the encapsulation groove. Compared with the prior art, this utility model provides a groove on the inner wall of the electronic channel. The groove serves as a gas buffer and pressure relief space. When the PP tube drives the rubber stopper downward along the electronic channel, the gas squeezed in front of the rubber stopper does not need to be completely compressed in the sealed space. It can partially flow into the groove for temporary storage. When the PP tube drives the rubber stopper past the position corresponding to the top of the groove, the groove connects to the outside through the electronic channel, allowing the squeezed gas to be discharged outward through the groove. This releases the pressure of the compressed gas, avoids excessive pressure rise in the channel, and prevents the compressed gas in the electronic channel from being carried into the gap between the PP tube and the electronic tube. This fundamentally weakens the upward thrust of the gas on the rubber stopper, significantly reducing the probability of "trapped gas rebounding and floating". At the same time, it can also improve the product assembly yield, reduce the labor and material input required for rework, directly reduce production costs, and avoid customer complaint risks. Attached Figure Description

[0008] Figure 1 This is a structural diagram of the electron tube assembly structure of the liquid level sensor of this utility model.

[0009] Figure 2 It is along Figure 1 A cross-sectional view along the AA direction.

[0010] Figure 3 yes Figure 2 The diagram shows the structure at the sensor head position.

[0011] Figure 4 yes Figure 3 Enlarged view of point B in the middle. Detailed Implementation

[0012] To explain in detail the technical content, structural features, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0013] Please see Figures 1 to 4The liquid level sensor of this utility model has an electron tube assembly structure 100 including a sensor head 1, an electron tube 2, and a PP tube 3. The sensor head 1 is provided with a connecting hole 11, an electron channel 12, and an electron tube mounting hole 13 connected in sequence. The inner side wall of the electron channel 12 is provided with a groove 121. The top of the electron tube 2 is installed in the electron tube mounting hole 13. The inside of the electron tube 2 is provided with a receiving channel 21 that communicates with the electron channel 12. The top of the PP tube 3 is provided with a rubber stopper 31. The bottom of the PP tube 3 passes through the connecting hole 11 and the electron channel 12 in sequence and is inserted into the receiving channel 21, thereby driving the rubber stopper 31 to pass through the electron channel 12 tightly and be inserted into the receiving channel 21.

[0014] The groove 121 on the inner wall of the electronic channel 12 can break the sealed space inside the electronic channel 12, providing a channel for gas to be temporarily stored and depressurized, avoiding excessive compression of the gas in the channel during the downward movement of the rubber plug 31, and reducing the occurrence of gas trapping from the root. The rubber plug 31 at the top of the PP tube 3 can play a sealing role, preventing external impurities or glue from entering the inside of the PP tube 3 and damaging the circuit. The way in which the rubber plug 31 moves close to the inner wall of the electronic channel 12 and the accommodating channel 21 can not only ensure the sealing effect, but also avoid the floating problem caused by gas compression with the cooperation of the groove 121, ensuring the stability of the position of the rubber plug 31 after the PP tube 3 is assembled.

[0015] Please see Figure 3 and Figure 4 In one embodiment, the groove 121 is arranged on the inner wall of the electronic channel 12 along the length direction of the electronic channel 12. The groove 121 arranged along the length direction can continuously provide pressure relief space for the gas throughout the entire process of the rubber stopper 31 descending along the electronic channel 12, further improving the solution to the problem of trapped gas, and preventing the gas in the electronic channel 12 from being compressed and eventually carried into the gap between the PP tube 3 and the electronic tube 2. At the same time, it can ensure that the rubber stopper 31 can maintain a stable downward state during the assembly process, avoiding the risk of floating due to excessive local gas pressure.

[0016] Please see Figure 3 and Figure 4In one embodiment, a plurality of grooves 121 are arranged at intervals along the circumferential direction of the electronic channel 12 on the inner sidewall of the electronic channel 12. The circumferentially spaced grooves 121 allow for effective release of gas from different locations within the electronic channel 12, avoiding localized gas accumulation caused by a single groove 121 and achieving a uniform pressure distribution within the channel. Simultaneously, the design of multiple grooves 121 enhances the overall pressure relief capacity of the grooves 121, further balancing the pressure within the channel, improving the suppression of the rubber stopper 31's upward movement, ensuring uniform force on the rubber stopper 31 in the circumferential direction, reducing tilting or displacement caused by uneven force, and guaranteeing assembly accuracy. Specifically, in this embodiment, the number of grooves 121 is four, but this is not a limitation. In other embodiments, the number of grooves 121 can be determined by those skilled in the art based on actual conditions.

[0017] Please see Figure 4 In one embodiment, a stepped structure 121a is formed between the groove 121 and the inner wall of the electronic channel 12. Furthermore, a dispensing area for potting adhesive is formed between the electronic channel 12 and the top of the rubber stopper 31. The formation of the stepped structure 121a facilitates the stable adhesion of the adhesive and prevents the adhesive from slipping off during product use. Please see Figure 3 and Figure 4 In one embodiment, the electron tube assembly structure 100 of the liquid level sensor further includes a sealing bushing assembly 4. The sealing bushing assembly 4 is sleeved on the top of the electron tube 2 and is used to seal between the electron tube 2 and the inner wall of the electron tube mounting hole 13. The addition of the sealing bushing assembly 4 can further enhance the sealing performance between the electron tube 2 and the sensor head 1, preventing external impurities such as liquid, dust, or glue from entering the sensor through the gap between the electron tube 2 and the electron tube mounting hole 13 and damaging the core components. At the same time, the sealing bushing assembly 4 can also improve the connection stability between the electron tube 2 and the sensor head 1, avoiding the electron tube 2 from loosening due to vibration or external force, and ensuring the reliability and service life of the entire assembly structure.

[0018] Specifically, in one embodiment, the sealing bushing assembly 4 includes a bushing 41, a sealing ring 42, and a bushing 43 sequentially fitted onto the electron tube 2 along the axial direction of the electron tube 2. The bushing 41, sealing ring 42, and bushing 43 are all located inside the electron tube mounting hole 13. The bushing 41 is fitted onto the top end face of the electron tube 2, which can protect the top of the electron tube 2 from collision damage during assembly. At the same time, it can also position the sealing ring 42 and bushing 43, ensuring that the three are arranged in an orderly manner in the axial direction. The sealing ring 42 seals between the electron tube 2 and the inner wall of the electron tube mounting hole 13. The sealing ring 42 has good elastic deformation ability and can tightly fit the inner wall of the electron tube 2 and the electron tube mounting hole 13 to achieve efficient sealing and prevent impurities from entering. The bushing 43 can enhance the structural strength between the electron tube 2 and the electron tube mounting hole 13, avoid wear or deformation caused by long-term use, and further improve the stability and sealing performance of the assembly structure.

[0019] Please see Figure 4 In one embodiment, the distance between the rubber plug 31 and the top end face of the electron tube 2 is 2mm, so the rubber plug 31 is only compressed and sealed by 2mm within the receiving channel 21 of the electron tube 2. Setting the distance between the rubber plug 31 and the top end face of the electron tube 2 to 2mm is the optimal distance verified by numerous experiments, reducing the risk of air entrapment due to excessive insertion depth of the rubber plug 31, while ensuring the installation effect of the rubber plug 31. Specifically, the distance from the top of the electron channel 12 to the rubber plug 31 can be set to 17mm. 17mm minus the length of the electron channel 12 equals 2mm, so that the distance between the rubber plug 31 and the top end face of the electron tube 2 is 2mm. Figure 4 As shown in the figure, D1 represents the distance between the rubber stopper 31 and the top end face of the electron tube 2, and D2 represents the distance from the top of the electron channel 12 to the rubber stopper 31. Therefore, the size of D2 is 17mm and the size of D1 is 2mm. However, this is not a limitation.

[0020] Please see Figures 2 to 4 In one embodiment, a circuit board 32 is disposed inside the PP tube 3. As the core control component of the liquid level sensor, the circuit board 32 is effectively protected by being disposed inside the PP tube 3, avoiding the influence of external environmental factors. The PP tube 3 has good insulation and corrosion resistance, which can provide a stable working environment for the circuit board 32, ensuring the normal operation of the electronic components on the circuit board 32, thereby ensuring the detection function of the liquid level sensor can be realized, and improving the overall performance and service life of the sensor. Please see Figure 3In one embodiment, the electron tube assembly structure 100 of the liquid level sensor further includes an encapsulation plate 5. The top surface of the sensor head 1 is provided with an encapsulation groove 14 communicating with the communication hole 11, and the encapsulation plate 5 is encapsulated in the encapsulation groove 14. The encapsulation plate 5, encapsulated in the encapsulation groove 14, can seal the communication hole 11, preventing external impurities from entering the sensor through the communication hole 11 and damaging components such as the PP tube 3 and the circuit board 32. At the same time, the encapsulation plate 5 can also protect the internal structure of the sensor head 1, improve the integrity and safety of the entire assembly structure, and ensure that the liquid level sensor can work normally in various complex environments.

[0021] Please see Figure 2 In one embodiment, the electron tube assembly structure 100 of the liquid level sensor further includes a float 6. The float 6 is sleeved on the electron tube 2 and located below the sensor head 1. As a sensing component for liquid level detection, the float 6 is sleeved on the electron tube 2 and located below the sensor head 1. It can move up and down along the axis of the electron tube 2 as the external liquid level changes. The movement of the float 6 can drive the relevant sensing elements to generate signal changes, thereby realizing the detection of the liquid level height.

[0022] Combination Figures 1 to 4 The specific principle of the electron tube assembly structure 100 of the liquid level sensor of this utility model is as follows: When assembling the electron tube 2 assembly of the liquid level sensor, the top of the electron tube 2 is first installed in the electron tube mounting hole 13 of the sensor head 1, and the sealing bushing assembly 4 is used to seal the electron tube 2 and the inner wall of the electron tube mounting hole 13, ensuring that the electron tube 2 and the sensor head 1 are firmly connected and well sealed. Next, the top of the PP tube 3, which has a circuit board 32 inside, is fitted with a rubber plug 31. Then, the bottom of the PP tube 3 is passed through the connecting hole 11 and the electronic channel 12 of the sensor head 1 in sequence, and inserted into the receiving channel 21 inside the electron tube 2. During this process, the PP tube 3 moves the rubber plug 31 close to the inner wall of the electronic channel 12 and the inner wall of the receiving channel 21. Since the inner wall of the electronic channel 12 has a groove 121, the gas squeezed by the rubber plug 31 can enter the groove 121 for temporary storage. The groove 121 is connected to the outside through the electronic channel 12, so that the squeezed gas can be discharged to the outside through the groove 121.

[0023] In summary, this invention provides a groove 121 on the inner wall of the electronic channel 12. The groove 121 serves as a gas buffer and pressure relief space. When the PP tube 3 drives the rubber stopper 31 downward along the electronic channel 12, the gas squeezed in front of the rubber stopper 31 does not need to be completely compressed in the sealed space and can partially flow into the groove 121 for temporary storage. When the PP tube 3 drives the rubber stopper 31 past the position corresponding to the top of the groove 121, the groove 121 is connected to the outside through the electronic channel 12, allowing the squeezed gas to be discharged outward through the groove 121, thereby releasing the pressure of the compressed gas, avoiding excessive increase in gas pressure in the channel, and preventing the gas in the electronic channel 12 from being compressed and eventually carried into the gap between the PP tube 3 and the electronic tube 2. This fundamentally weakens the upward pushing force of the gas on the rubber stopper 31, significantly reducing the probability of the "trapped gas rebound and floating" phenomenon. At the same time, it can also improve the product assembly yield, reduce the labor and material input required for rework, directly reduce production costs, and avoid customer complaint risks. Secondly, by setting a fixed distance of 2mm between the rubber stopper 31 and the top end face of the electron tube 2, the short depth compression assembly distance can effectively further improve the assembly air trapping phenomenon.

[0024] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. An assembly structure for an electron tube component of a liquid level sensor, characterized in that, include: The sensor head has a connecting hole, an electronic channel and an electronic tube mounting hole connected in sequence inside the sensor head, and the inner sidewall of the electronic channel has a groove. An electron tube, the top of which is installed in the electron tube mounting hole, and the interior of which is provided with a receiving channel communicating with the electron channel; A PP tube is provided with a rubber stopper at the top. The bottom of the PP tube passes through the connecting hole and the electronic channel in sequence and is inserted into the receiving channel, thereby driving the rubber stopper to pass through the electronic channel and be inserted into the receiving channel in a close fit.

2. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, The groove is arranged along the length of the electronic channel on the inner wall of the electronic channel.

3. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, Several of the grooves are arranged at intervals on the inner wall of the electronic channel along the circumferential direction.

4. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, A stepped structure is formed between the groove and the inner wall of the electronic channel.

5. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, A dispensing area for dispensing adhesive is formed between the electronic channel and the top of the rubber stopper.

6. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, It also includes a sealing bushing assembly, which is fitted onto the top of the electron tube and used to seal between the electron tube and the inner wall of the electron tube mounting hole.

7. The electron tube assembly structure of the liquid level sensor according to claim 6, characterized in that, The sealing bushing assembly includes a bushing cap, a sealing ring, and a bushing sequentially fitted onto the electron tube along its axial direction. The bushing cap, the sealing ring, and the bushing are all located inside the electron tube mounting hole. The bushing cap is fitted onto the top end face of the electron tube, and the sealing ring seals between the electron tube and the inner wall of the electron tube mounting hole.

8. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, The distance between the rubber stopper and the top end face of the electron tube is 2mm.

9. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, The PP pipe contains a circuit board.

10. The electron tube assembly structure of the liquid level sensor according to claim 1, characterized in that, It also includes a packaging plate, wherein the top surface of the sensor head is provided with a packaging groove communicating with the communication hole, and the packaging plate is packaged in the packaging groove.

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