Magnetostriction liquid level sensor shell capable of preventing strong acid corrosion and strong alkali corrosion
By adopting the thread interference matching design of PP and PFA shells in the magnetostrictive liquid level sensor, the problem of poor sealing in strong acid and alkali liquids is solved, and a higher sealing and longer service life is achieved.
Patent Information
- Application Number
- CN202421936420.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-09
AI Technical Summary
Existing magnetostrictive liquid level sensors are prone to sealing problems in strong acid and alkali liquids, resulting in corrosion of internal components and affecting the normal use of the sensor.
The design includes a PP shell and a PFA shell. The PFA shell has an upper end opening and a lower end sealing accommodation cavity. The outer wall of the PP shell is interfered with the threads of the inner wall of the receiving cavity to form a tight sealing structure.
It effectively improves the sealing of the sensor, prevents the corrosion of strong acid and strong alkali liquids, extends the service life, reduces the requirements for processing and mold accuracy, and improves production efficiency.
Smart Images
Figure CN223050711U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of magnetostrictive liquid level sensors, and in particular to a magnetostrictive liquid level sensor housing resistant to strong acid and strong alkali corrosion. Background Art
[0002] With the development of industries such as photovoltaic, pharmaceutical, food, petrochemical, offshore engineering, shipbuilding, military, and environmental protection water treatment, the application of magnetostrictive liquid level sensors in the foregoing fields is becoming more and more extensive. Especially in the photovoltaic industry, in the process of polysilicon production, a mixed acid of hydrofluoric acid and nitric acid is used. Since PFA material has good strong acid and strong alkali corrosion resistance, the magnetostrictive liquid level sensor made of PFA material is widely used for the detection and precise control of the ratio of strong acid and strong alkali liquids in the cleaning and texturing equipment during the production process of photovoltaic wafers.
[0003] Currently, there are two main structural forms of magnetostrictive liquid level sensors made of PFA material:
[0004] 1. The entire sensor housing is made of PFA material. Although the sealing performance can be guaranteed, the price of PFA material is expensive, and the product has no competitive advantage.
[0005] 2. The housing in contact with strong acid and strong alkali liquids is made of PFA material, and the non-contact part is made of low-cost PP material. Although the product cost is greatly reduced and it has strong market competitiveness. However, there are the following technical problems: The annular PP material housing is sleeved on the columnar PFA material housing and then fixedly connected by bolts, resulting in an annular connection gap between the two on the strong acid and strong alkali liquid contact surface. When immersed in strong acid and strong alkali liquids for a long time, the water vapor containing the mixed acid enters the connection gap and then enters the electronic compartment, causing corrosion of the internal components and affecting the normal use of the sensor. Moreover, the sleeved connection method requires the PP material housing and the PFA material housing to be closely matched, with high precision requirements for both, and thus high precision requirements for the housing mold, complex process, and low production efficiency.
[0006] In view of this, the present utility model is specifically proposed. Content of the Utility Model
[0007] The purpose of the present utility model is to provide a magnetostrictive liquid level sensor housing resistant to strong acid and strong alkali corrosion, so as to solve the technical problems existing in the prior art that the design of the sensor housing has defects, there are connection gaps on the liquid contact surface, poor sealing performance, and it is easy to affect the normal use of the sensor. The many technical effects that can be produced by the preferred technical solutions provided by the present utility model are described in detail below.
[0008] To achieve the above purpose, the present utility model provides the following technical solutions:
[0009] A magnetostrictive liquid level sensor housing that resists strong acid and strong alkali corrosion provided by the present utility model includes a PP outer shell and a PFA outer shell. The PFA outer shell has a receiving cavity with an open upper end and a closed lower end. The outer wall of the PP outer shell is in interference fit with the inner wall of the receiving cavity by threads.
[0010] Preferably, an external thread section is provided on the outer wall of the PP outer shell, and an internal thread section is provided on the inner wall of the receiving cavity. The external thread section and the internal thread section are in interference fit by threads.
[0011] Preferably, a first flange and a second flange are sequentially provided above the external thread section. The diameter of the second flange is greater than that of the first flange. A third flange is provided above the internal thread section. The outer peripheral edge of the lower end surface of the second flange abuts against the upper end surface of the third flange, so as to form a closed receiving groove for receiving a seal between the inner peripheral edge of the lower end surface of the second flange, the first flange, the upper end surface of the internal thread section, and the third flange.
[0012] Preferably, a connecting pipe is provided on the PFA outer shell for installing a detection rod. A through hole for the connecting pipe to pass through is provided on the support plate of the PP outer shell. The connecting pipe is in interference fit with the through hole.
[0013] Preferably, the connecting pipe extends along the axial direction of the PFA outer shell.
[0014] Preferably, the PP outer shell, the PFA outer shell, and the seal are assembled into one body after being cryogenically treated.
[0015] Preferably, the support plate is located above the first flange and is used for installing components.
[0016] Preferably, grooves are provided on the outer wall of the PFA outer shell, and the grooves are evenly arranged along the circumferential direction of the PFA outer shell.
[0017] The preferred technical solution of the present utility model can at least further produce the following technical effects:
[0018] The utility model effectively avoids the technical problems existing in the design of the sensor housing, such as connection gaps on the liquid contact surface, poor sealing performance, and easy influence on the normal use of the sensor. The utility model provides a magnetostrictive liquid level sensor housing that is resistant to strong acids and alkalis, including a PP housing and a PFA housing. The PFA housing has a receiving cavity with an open upper end and a closed lower end. The outer wall of the PP housing is in interference fit with the inner wall of the receiving cavity by threads. Through the receiving cavity of the PFA housing with an open upper end and a closed lower end, the closed lower end surface is used to contact strong acid and alkali liquids. Due to the excellent corrosion resistance of the PFA housing, it can resist the erosion of corrosive liquids such as strong acids and alkalis, so as to improve the stability and reliability of the sensor during use. Then, the PFA housing is sleeved on the PP housing, so that the installation and combination position of the two is changed from the original strong acid and alkali contact surface to a non-contact surface, and the two are in interference fit by threads to form a tight sealing structure, improve the sealing performance of the sensor, extend the service life, and also reduce the requirements for processing and mold accuracy, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0020] Figure 1 FIG. 1 is a schematic structural diagram of a magnetostrictive liquid level sensor housing resistant to strong acids and alkalis provided by the present utility model;
[0021] Figure 2 FIG. 2 is a cross-sectional view of a magnetostrictive liquid level sensor housing resistant to strong acids and alkalis provided by the present utility model.
[0022] In the figure:
[0023] 1. PP housing; 11. External thread section; 12. First convex edge; 13. Second convex edge; 14. Support plate; 15. Through hole; 16. Threaded hole;
[0024] 2. PFA housing; 21. Receiving cavity; 22. Internal thread section; 23. Communication pipe; 24. Third convex edge; 25. Groove. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] To make the objectives, technical solutions, and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present utility model.
[0026] As Figure 1 - Figure 2 shown, the present utility model provides a magnetostrictive liquid level sensor housing resistant to strong acid and strong alkali corrosion, including a PP outer shell 1 and a PFA outer shell 2. The PFA outer shell 2 has a receiving cavity 21 with an upper opening and a lower closed end. The outer wall of the PP outer shell 1 is in interference fit with the inner wall of the receiving cavity 21 by threads.
[0027] Due to the receiving cavity 21 of the PFA outer shell 2 having an upper opening and a lower closed end, the closed lower end surface is used to contact strong acid and strong alkali liquids. Through the excellent corrosion resistance of the PFA outer shell 2, it can resist the erosion of corrosive liquids such as strong acids and strong alkalis, so as to improve the stability and reliability of the sensor during use. Then, the PFA outer shell 2 is sleeved on the PP outer shell 1, so that the installation and combination position of the two is changed from the original strong acid and strong alkali contact surface to a non-contact surface, and the two adopt an interference fit by threads to form a tight sealing structure, improve the sealing performance of the sensor, extend the service life, and also reduce the requirements for processing and mold accuracy, improving production efficiency.
[0028] As an optional implementation manner, an external thread section 11 is provided on the outer wall of the PP outer shell 1, and an internal thread section 22 is provided on the inner wall of the receiving cavity 21. The external thread section 11 and the internal thread section 22 are in interference fit by threads.
[0029] Through the interference fit of the external thread section 11 and the internal thread section 22, a tight sealing structure is formed at the connection between the PP outer shell 1 and the PFA outer shell 2, improving the connection stability and sealing performance of the two. Moreover, the connection method of interference fit by threads reduces the requirements for processing and mold accuracy, simplifies the production process, and improves production efficiency.
[0030] As an optional implementation manner, a first flange 12 and a second flange 13 are sequentially provided above the external thread section 11. The diameter of the second flange 13 is greater than that of the first flange 12. A third flange 24 is provided above the internal thread section 22. The outer peripheral edge of the lower end surface of the second flange 13 abuts against the upper end surface of the third flange 24, so as to form a closed receiving groove for receiving the sealing member between the inner peripheral edge of the lower end surface of the second flange 13, the first flange 12, the upper end surface of the internal thread section 22, and the third flange 24, further improving the sealing performance at the connection between the PP outer shell 1 and the PFA outer shell 2.
[0031] Further, the inner diameter of the third convex edge 24 gradually decreases from top to bottom.
[0032] The seal includes a sealing component in the prior art such as an O-ring or a gasket.
[0033] As an alternative embodiment, a communication pipe 23 is provided on the PFA housing 2 for installing a detection rod. A through hole 15 for the communication pipe 23 to pass through is provided on the support plate 14 of the PP housing 1, and the communication pipe 23 is in interference fit with the through hole 15.
[0034] Further, after the PP housing 1 and the PFA housing 2 are assembled into one body, the upper end surface of the communication pipe 23 is flush with the upper end surface of the through hole 15.
[0035] The communication pipe 23 and the through hole 15 are connected by an interference fit method, so that the two are closely fitted, improving the connection stability and reliability between the two.
[0036] As an alternative embodiment, the communication pipe 23 extends along the axial direction of the PFA housing 2.
[0037] Further, the communication pipe 23 protrudes from the third convex edge 24 and the lower end surface of the PFA housing 2, so that the detection rod can enter the interior of the PP housing 1 along the communication pipe 23 and be connected to the components. Moreover, with such a setting, the communication pipe 23 can be used as a positioning point during assembly, facilitating the assembly of the PP housing 1 and the PFA housing 2.
[0038] As an alternative embodiment, the PP housing 1, the PFA housing 2 and the seal are assembled into one body after being cryogenically treated.
[0039] If the PP housing 1 and the PFA housing 2 are directly assembled at room temperature, when the ambient temperature decreases, due to the principle of thermal expansion and contraction, gaps may be generated between the PP housing 1 and the PFA housing 2, resulting in liquid leakage.
[0040] However, the PP housing 1, the PFA housing 2 and the seal of the present utility model are assembled into one body after being cryogenically treated, which can ensure that the PP housing 1, the PFA housing 2 and the seal can maintain a tight connection in both low-temperature and high-temperature environments, improving the overall sealing performance and preventing liquid leakage. Among them, the freezing time and temperature can be set according to the usage requirements.
[0041] As an alternative embodiment, the support plate 14 is located above the first convex edge 12 for installing components.
[0042] Further, the function of the support plate 14 is to provide an installation platform for the components. Threaded holes 16 are provided on the upper end surface of the support plate 14. The number of the threaded holes 16 is multiple and they are arranged around the through hole 15.
[0043] Pass the bolts through the mounting holes and threaded holes 16 of the component in sequence to firmly mount the component on the support plate 14.
[0044] As an alternative implementation, a groove 25 is provided on the outer wall of the PFA housing 2, and the grooves 25 are evenly arranged along the circumferential direction of the PFA housing 2.
[0045] The function of the groove 25 is to enable the user to rotate the PFA housing 2 more easily and smoothly.
[0046] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be referred to the same or similar content in other embodiments.
[0047] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0048] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "mounting", "connecting", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0049] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "one example" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0050] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.
Claims
1. A magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion, characterized in that: It comprises a PP shell and a PFA shell. The PFA shell is provided with a containing cavity which is open at the upper end and closed at the lower end. The outer wall of the PP shell is thread-interference-fitted with the inner wall of the containing cavity.
2. The magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion according to claim 1, characterized in that: An external thread section is arranged on the outer wall of the PP shell, and an internal thread section is arranged on the inner wall of the accommodating cavity. The external thread section and the internal thread section are in thread interference fit.
3. The magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion according to claim 2, characterized in that: A first flange and a second flange are sequentially arranged above the external thread section, wherein the diameter of the second flange is larger than the diameter of the first flange, and a third flange is arranged above the internal thread section, wherein the outer peripheral edge of the lower end face of the second flange abuts against the upper end face of the third flange, so that a closed receiving groove for receiving a seal is formed between the inner peripheral edge of the lower end face of the second flange, the first flange, the upper end face of the internal thread section and the third flange.
4. The magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion according to claim 3, characterized in that: The PFA shell is provided with a connecting pipe for installing the detection rod, and the supporting plate of the PP shell is provided with a through hole for the connecting pipe to pass through, and the connecting pipe is interference fit with the through hole.
5. The magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion according to claim 4, characterized in that: The communication pipe extends in an axial direction of the PFA housing.
6. The magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion according to claim 3, characterized in that: The PP shell, the PFA shell and the sealing element are assembled into one body after being frozen.
7. The magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion according to claim 4, characterized in that: The support plate is located above the first convex edge and is used for mounting components.
8. The magnetostrictive liquid level sensor housing resistant to strong acid and alkali corrosion according to claim 1, characterized in that: Grooves are arranged on the outer wall of the PFA shell, and the grooves are evenly arranged along the circumference of the PFA shell.