An ultra-high temperature tuning fork level switch probe

Abstract

The present invention relates to the technical field of point measurement, and specifically provides an ultra-high temperature tuning fork level switch probe, which aims to solve the problem that the existing tuning fork level switch probe is difficult to adapt to the detection of high temperature media. To this end, the ultra-high temperature tuning fork level switch probe of the present invention includes a shell, a fork body and an excitation source. The shell is provided with a cavity along the axial direction. The shell includes a front cylinder, a mounting member and a rear cylinder connected in sequence, and the rear cylinder is inserted into the measured medium; the mounting member is provided with a flexible isolator, and the isolator includes an inner ring, an outer ring and a flexible buffer body located between the inner ring and the outer ring. The inner ring is sleeved and fixed on the outside of the fork body, and the outer ring is fixed to the mounting member; the fork body is located in the cavity, and the excitation source is located at one end of the front cylinder away from the rear cylinder. The isolator can block the cavities on both sides of the isolator, reduce the rate of heat transfer through the air in the cavity, thereby reducing the temperature of the front cylinder and the excitation source, so that the tuning fork level switch probe has the possibility of adapting to the detection of high temperature media.

Description

Technical Field

[0001] The invention relates to the technical field of point position measurement, and specifically provides an ultra-high temperature tuning fork level switch probe. Background Art

[0002] The tuning fork level switch probe is also often called a tuning fork level meter or a tuning fork level controller. This is mainly because the tuning fork level switch probe appears in different links of industrial production and actually plays different key roles, so people habitually call it many different names. The tuning fork level switch probe has the characteristics of long service life, stable performance, safety and reliability, strong adaptability, no need for adjustment and maintenance-free. It is widely used in process control of material level in metallurgy, building materials, chemical industry, light industry, grain and other industries. In addition, the tuning fork level switch probe is not affected by foam, eddy current and gas, and is suitable for fixed-point alarm or control of the material level of solid materials in various silos and the liquid level in various containers. For example, for solid materials, it mainly measures medium-density solid powders or particles that can flow freely, such as fly ash, cement, sand, stone powder, plastic particles, salt, sugar, etc.; for liquid materials, it mainly measures explosive and non-explosive dangerous liquids, corrosive liquids and high-viscosity liquids, such as water, acid, alkali, mud, pulp, dyes, oils, milk, wine, beverages, etc.

[0003] The working principle of the tuning fork level switch probe is to make the tuning fork vibrate at a certain resonant frequency through an excitation source installed on the tuning fork base. When the tuning fork contacts the measured medium, the frequency and amplitude of the tuning fork will change. These changes are detected, processed and converted into a switch signal by the intelligent circuit. The measurement results of the tuning fork level switch probe are highly accurate and applicable to a wide range of occasions. It is one of the most widely used products in point monitoring products. And the tuning fork level switch probe can ensure the highest detection reliability after being equipped with a self-detection function.

[0004] The current tuning fork level switch probe is often used for detecting media at room temperature or sub-high temperature (for example, below 260 degrees Celsius). If it is used to detect ultra-high temperature media (for example, 260 degrees Celsius to 500 degrees Celsius), the temperature will gradually be transmitted to the excitation source in the tuning fork level switch probe, causing the excitation source to fail or be distorted.

[0005] Therefore, there is an urgent need for an ultra-high temperature tuning fork level switch probe to solve the problem that the existing tuning fork level switch probe is difficult to adapt to high temperature medium detection. Summary of the invention

[0006] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing tuning fork level switch probe is difficult to adapt to high-temperature medium detection.

[0007] In a first aspect, the present invention provides an ultra-high temperature tuning fork level switch probe, comprising: a shell, which is provided with a cavity along the axial direction, comprising a front cylinder, a mounting member and a rear cylinder connected in sequence, and the rear cylinder is inserted into the measured medium; the mounting member is provided with a flexible isolation member, which is configured to isolate the cavities on both sides of the isolation member; a fork body is located in the cavity; an excitation source is located at one end of the front cylinder away from the rear cylinder, and is configured to drive the fork body to resonate; the isolation member comprises an inner ring, an outer ring and a flexible buffer body located between the inner ring and the outer ring, the inner ring is sleeved and fixed on the outside of the fork body, and the outer ring is fixed to the mounting member.

[0008] By adopting the above technical solution, the excitation source is located at the front cylinder away from the high-temperature medium, which can reduce the speed of the excitation source temperature increase and facilitate auxiliary heat dissipation, so that the tuning fork level switch probe can adapt to high-temperature medium detection.

[0009] In a specific embodiment of the above-mentioned ultra-high temperature tuning fork level switch probe, a first hole is opened at one end of the front cylinder away from the rear cylinder, and the first end of the fork body is located in the first hole and exceeds the end of the front cylinder away from the rear cylinder; the excitation source is located at the first end of the fork body, and a heat insulating member is arranged between the excitation source and the fork body.

[0010] By adopting the above technical solution, a heat insulating member is arranged between the fork body and the excitation source, which can reduce the rate of heat transfer from the fork body to the excitation source and the rate of temperature increase of the excitation source, so that the tuning fork level switch probe can more easily adapt to high-temperature medium detection.

[0011] In a specific embodiment of the ultra-high temperature tuning fork level switch probe, the excitation source is a piezoelectric ceramic sleeved on the first end of the fork body, and the thermal insulation member is a thermal insulation sleeve sleeved on the first end of the fork body.

[0012] By adopting the above technical solution, the piezoelectric ceramics can more easily drive the fork body to resonate.

[0013] In a specific implementation of the above-mentioned ultra-high temperature tuning fork level switch probe, the ultra-high temperature tuning fork level switch probe further includes a thermal insulation pad, and the thermal insulation pad is located between the excitation source and the front cylinder.

[0014] By adopting the above technical solution, the thermal insulation pad can reduce the heat transfer rate between the front cylinder and the excitation source, thereby reducing the rate of temperature increase of the excitation source, so that the tuning fork level switch probe can more easily adapt to high-temperature medium detection.

[0015] In a specific implementation of the ultra-high temperature tuning fork level switch probe, a heat sink is provided on the outer peripheral surface of the front cylinder.

[0016] By adopting the above technical solution, the heat sink can reduce the temperature of the front cylinder, thereby reducing the temperature of the excitation source, so that the tuning fork level switch probe can more easily adapt to high-temperature medium detection.

[0017] In a specific implementation of the ultra-high temperature tuning fork level switch probe, the mounting member is provided with a flexible isolating member configured to isolate the cavities on both sides of the isolating member.

[0018] By adopting the above technical solution,

[0019] In a specific embodiment of the above-mentioned ultra-high temperature tuning fork level switch probe, the isolating member includes an inner ring, an outer ring and a flexible buffer body located between the inner ring and the outer ring, the inner ring is sleeved and fixed on the outside of the fork body, and the outer ring is fixed to the mounting member.

[0020] In a specific embodiment of the ultra-high temperature tuning fork level switch probe, the front cylinder is provided with a liquid inlet joint and a liquid outlet joint connected to the cavity of the front cylinder, and the side of the isolating member facing the front cylinder is coated with a deformable waterproof coating.

[0021] By adopting the above technical solution, coolant is introduced into the liquid inlet joint and flows through the cavity of the front cylinder and then flows out from the liquid outlet joint, thereby cooling the front cylinder and the fork body, reducing the temperature of the front cylinder and the fork body, and then reducing the temperature of the excitation source, so that the tuning fork level switch probe can more easily adapt to high-temperature medium detection.

[0022] In a specific embodiment of the ultra-high temperature tuning fork level switch probe, the mounting member includes a first mounting portion and a second mounting portion, and an end of the first mounting portion facing the second mounting portion and an end of the second mounting portion facing the first mounting portion are both coated with oxide ceramics.

[0023] By adopting the above technical solution, the oxide ceramic coated on the first mounting part and the second mounting part can reduce the heat transfer rate between the first mounting part and the second mounting part, thereby reducing the temperature of the first mounting part and other components connected to the first mounting part, so that the tuning fork level switch probe can more easily adapt to high-temperature medium detection.

[0024] In a specific embodiment of the ultra-high temperature tuning fork level switch probe, a baffle is provided at the second end of the fork body, and the baffle is located at an end of the rear cylinder away from the front cylinder for closing the rear cylinder.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] The ultra-high temperature tuning fork level switch probe of the present invention comprises a shell, a fork body and an excitation source. The shell is provided with a cavity along the axial direction. The shell comprises a front cylinder, a mounting member and a rear cylinder connected in sequence, and the rear cylinder is inserted into the measured medium; the mounting member is provided with a flexible isolator, which is configured to isolate the cavities on both sides of the isolator; the isolator comprises an inner ring, an outer ring and a flexible buffer body located between the inner ring and the outer ring, the inner ring is sleeved and fixed on the outside of the fork body, and the outer ring is fixed to the mounting member; the fork body is located in the cavity, and the excitation source is located at one end of the front cylinder away from the rear cylinder, and is configured to drive the fork body to resonate. The excitation source is located at the front cylinder away from the high temperature medium, which can reduce the speed of the excitation source temperature rise and facilitate auxiliary heat dissipation; at the same time, the isolator can block the cavities on both sides of the isolator, reduce the rate of heat transfer through the air in the cavity, thereby reducing the temperature of the front cylinder and the excitation source, so that the tuning fork level switch probe can more easily adapt to high temperature medium detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a cross-sectional view of a tuning fork level switch probe provided by the present invention;

[0029] Figure 2 is an exploded view of the tuning fork level switch probe provided by the present invention;

[0030] Figure 3 It is a cross-sectional view of the mounting piece of the tuning fork level switch probe provided by the present invention.

[0031] Description of reference numerals:

[0032] 11. Front cylinder; 111. First cavity; 112. First hole; 113. Heat sink; 12. Mounting piece; 121. First mounting portion; 122. Second mounting portion; 123. Second cavity; 13. Rear cylinder; 131. Third cavity; 2. Fork body; 21. Baffle; 22. Nut; 23. Gasket; 3. Excitation source; 4. Heat insulation piece; 5. Heat insulation pad; 6. Isolation piece; 61. Inner ring; 62. Outer ring; 63. Flexible buffer. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0034] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0036] In order to solve the problem that the existing tuning fork level switch probe is difficult to adapt to high temperature medium detection, the present invention provides an ultra-high temperature tuning fork level switch probe. Figure 1 As shown, the tuning fork level switch probe includes a shell, a fork body 2 and an excitation source 3. The shell is provided with a cavity along the axial direction, the fork body 2 is located in the cavity, and both ends of the fork body 2 extend out of the shell. The excitation source 3 is arranged at one end of the shell and is configured to drive the fork body 2 to resonate. When the tuning fork level switch probe is in use, the end where the excitation source 3 is not arranged is placed in the measured medium, so that one end of the fork body 2 can contact the measured medium. At this time, the excitation source 3 can be as far away from the measured medium as possible to reduce the speed of the temperature rise of the excitation source 3, and facilitate auxiliary heat dissipation, so that the tuning fork level switch probe can adapt to high-temperature medium detection.

[0037] like Figure 1 and Figure 2 As shown, the shell includes a front cylinder 11, a mounting member 12 and a rear cylinder 13 connected in sequence, and the parts of the cavity in the front cylinder 11, the mounting member 12 and the rear cylinder 13 are respectively a first cavity 111, a second cavity 123 and a third cavity 131. Generally speaking, the mounting member 12 is fixed to the side wall of a container such as a silo, the rear cylinder 13 is inserted into a container such as a silo, and the front cylinder 11 is located in the air. In a specific embodiment of the present invention, the front cylinder 11, the mounting member 12 and the rear cylinder 13 are all connected in a detachable fixed manner (such as a threaded connection) to facilitate assembly and maintenance. Of course, in other possible embodiments, the front cylinder 11, the mounting member 12 and the rear cylinder 13 can also be connected by welding or the like, or be set as an integrated structure.

[0038] A first hole 112 is provided at one end of the front cylinder 11 away from the rear cylinder 13, and the first hole 112 is connected to the first cavity 111. The first end of the fork body 2 is located in the first hole 112 and extends out of the end of the front cylinder 11 away from the rear cylinder 13, and the excitation source 3 is located at the end of the front cylinder 11 away from the rear cylinder 13 and in contact with the fork body 2, so that the excitation source 3 can drive the fork body 2 to resonate. A heat insulating member 4 is provided between the excitation source 3 and the fork body 2. Since the second end of the fork body 2 (i.e., the end extending out of the end of the rear cylinder 13) is placed in the measured medium, the heat in the measured medium is easily and gradually conducted to the excitation source 3 through the fork body 2, wherein the heat insulating member 4 can reduce the rate of heat transfer from the fork body 2 to the excitation source 3, thereby reducing the rate of temperature increase of the excitation source 3, and reducing the rate of temperature increase of the excitation source 3. As the temperature of the excitation source 3 increases, under the same conditions, the heat dissipation rate of the excitation source 3 increases, while the heat absorption rate decreases. Once the heat dissipation rate of the excitation source 3 is equal to the heat absorption rate, the temperature of the excitation source 3 can be kept within a specific range. By using the heat insulation 4 to reduce the heat absorption rate of the excitation source 3, the temperature at which the excitation source 3 maintains thermal stability can be reduced, so that the excitation source 3 in the tuning fork level switch probe can be more easily adapted to high-temperature medium detection.

[0039] A baffle 21 is disposed at the second end of the fork body 2. The baffle 21 is located at one end of the rear cylinder 13 away from the front cylinder 11 and is used to seal the rear cylinder 13 to prevent high-temperature media from entering the cavity.

[0040] A heat insulation pad 5 is arranged between the front cylinder 11 and the excitation source 3. The heat insulation pad 5 can reduce the heat transfer efficiency between the front cylinder 11 and the excitation source 3, thereby reducing the rate of temperature rise of the excitation source 3, and further reducing the temperature at which the excitation source 3 maintains thermal stability, so that the excitation source 3 of the tuning fork level switch probe can more easily adapt to high-temperature medium detection. In addition, a part of the heat insulation pad 5 is inserted into the first hole 112 to facilitate the positioning and installation of the heat insulation pad 5. The material of the heat insulation pad 5 can specifically be ceramic or plastic with low thermal conductivity efficiency. The heat insulation pad 5 and the excitation source 3 are both sleeved on the first end of the fork body 2, and a nut 22 and a gasket 23 are arranged on the end of the excitation source 3 away from the heat insulation sleeve, wherein the nut 22 is threadedly connected to the first end of the fork body 2, thereby squeezing the excitation source 3 and the heat insulation pad 5 close to the front cylinder 11, and at the same time driving the baffle 21 close to the rear cylinder 13 to reliably close the rear cylinder 13.

[0041] In addition, a heat sink 113 can be provided on the outer peripheral surface of the front cylinder 11, and the heat sink 113 is used to reduce the temperature of the front cylinder 11, thereby reducing the rate of heat transfer from the front cylinder 11 to the excitation source 3, thereby reducing the temperature at which the excitation source 3 maintains thermal stability, so that the excitation source 3 in the tuning fork level switch probe can more easily adapt to high-temperature medium detection.

[0042] In a specific example of the present invention, the excitation source 3 is a piezoelectric ceramic sleeved on the first end of the fork body 2, and the piezoelectric ceramic can be vibrated by inputting an electrical signal to the piezoelectric ceramic, wherein the vibration frequency of the piezoelectric ceramic is related to the input electrical signal. The thermal insulation member 4 is a thermal insulation sleeve sleeved on the first end of the fork body 2, and the material can be a heat-resistant plastic, such as PEEK (polyetheretherketone), PVDF (polyvinylidenedifluoride, polyvinylidene fluoride), etc.

[0043] In summary, the tuning fork level switch probe provided in the embodiment of the present invention can adapt to high temperature medium detection mainly relying on the following designs:

[0044] (1) The excitation source 3 is set at the end farthest from the measured medium to reduce the temperature rise rate of the excitation source 3 and facilitate auxiliary heat dissipation, so that the tuning fork level switch probe can adapt to high-temperature medium detection;

[0045] (2) A heat insulating sleeve is provided between the excitation source 3 and the fork body 2 to reduce the heat transfer rate between the fork body 2 and the excitation source 3, thereby reducing the temperature at which the excitation source 3 maintains thermal stability, so that the excitation source 3 in the tuning fork level switch probe can more easily adapt to high-temperature medium detection;

[0046] (3) A heat insulation pad 5 is provided between the front cylinder 11 and the excitation source 3 to reduce the heat transfer efficiency between the front cylinder 11 and the excitation source 3, thereby reducing the temperature at which the excitation source 3 maintains thermal stability, so that the excitation source 3 in the tuning fork level switch probe can more easily adapt to high-temperature medium detection;

[0047] (4) A heat sink 113 is provided on the front cylinder 11 to reduce the temperature of the front cylinder 11, thereby reducing the rate of heat transfer from the front cylinder 11 to the excitation source 3, thereby reducing the temperature at which the excitation source 3 maintains thermal stability, so that the excitation source 3 in the tuning fork level switch probe can more easily adapt to high-temperature medium detection. Example

[0048] The embodiment of the present invention provides a tuning fork level switch probe, and its structure is substantially the same as that of the tuning fork level switch probe provided in the first embodiment, except that the structure of the mounting member 12 is different.

[0049] Specifically, Figure 3 As shown, the mounting member 12 includes a first mounting portion 121 and a second mounting portion 122 connected to each other, the first mounting portion 121 is connected to the front barrel 11, and the second mounting portion 122 is connected to the rear barrel 13. One end of the first mounting portion 121 facing the second mounting portion 122 is coated with oxide ceramics, and one end of the second mounting portion 122 facing the first mounting portion 121 is also coated with oxide ceramics, and the first mounting portion 121 and the second mounting portion 122 are connected by threads.

[0050] In addition, a flexible isolator 6 is provided in the mounting member 12, and the isolator 6 is configured to block the cavity on both sides of the isolator 6, reduce the rate of heat transfer through the air in the cavity, thereby reducing the temperature of the front cylinder 11 and the excitation source 3, so that the tuning fork level switch probe can more easily adapt to high temperature medium detection. For example, the isolator 6 can be a material with certain buffering properties such as graphite.

[0051] At the same time, it can be predicted that the more parts that are in rigid contact with the fork body 2, the more parts that resonate with the fork body 2 and the excitation source 3, and the smaller the change in the vibration frequency of the fork body 2 after contacting the measured medium. The flexible isolation member 6 can prevent the fork body 2 from being in rigid contact with the mounting member 12. When the measured medium contacts and separates from the fork body 2, the vibration frequency of the fork body 2 changes more, making it easier to distinguish whether the material level of the measured medium drops below the position of the tuning fork level switch probe, and the accuracy is higher.

[0052] As a specific solution, the isolating member 6 includes an inner ring 61, an outer ring 62, and a flexible buffer body 63 located between the inner ring 61 and the outer ring 62. The inner ring 61 is sleeved and fixed on the outer side of the fork body 2, and the outer ring 62 is fixed to the mounting member 12. For example, the outer ring 62 is fixed between the first mounting portion 121 and the second mounting portion 122, and is clamped by the first mounting portion 121 and the second mounting portion 122 for fixing. The inner ring 61 and the outer ring 62 are both made of hard materials (such as high temperature resistant plastic or metal), and the flexible buffer body 63 can be woven from flexible materials such as ceramic fiber or glass fiber to ensure that the isolating member 6 can withstand high temperature environments without deformation or damage.

[0053] Furthermore, the side of the isolating member 6 facing the front cylinder 11 is coated with a deformable waterproof coating, and the front cylinder 11 is provided with a liquid inlet joint and a liquid outlet joint connected to the first cavity 111 of the front cylinder 11. For example, a rubber coating is coated on the side of the flexible buffer body 63 close to the front cylinder 11. Cooling liquid is introduced into the liquid inlet joint and flows through the first cavity 111 and then flows out from the liquid outlet joint, thereby cooling the front cylinder 11 and the fork body 2, reducing the temperature of the front cylinder 11 and the fork body 2, and then reducing the temperature of the excitation source 3, so that the tuning fork level switch probe can more easily adapt to high temperature medium detection. At the same time, sealing members such as O-rings can also be provided between the thermal insulation pad 5 and the front cylinder 11 and between the thermal insulation pad 5 and the fork body 2 for sealing to prevent leakage.

[0054] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An ultra-high temperature tuning fork level switch probe, characterized in that: include: The housing has a cavity formed in the axial direction, and comprises a front cylinder (11), a mounting member (12) and a rear cylinder (13) connected in sequence, wherein the rear cylinder (13) is inserted into the measured medium; A fork body (2), located in the cavity; An excitation source (3) is located at an end of the front cylinder (11) away from the rear cylinder (13) and is configured to drive the fork body (2) to resonate; The mounting member (12) is provided with a flexible isolating member (6) configured to isolate the cavities on both sides of the isolating member (6); the isolating member (6) comprises an inner ring (61), an outer ring (62) and a flexible buffer body (63) located between the inner ring (61) and the outer ring (62); the inner ring (61) is sleeved and fixed on the outer side of the fork body (2), and the outer ring (62) is fixed to the mounting member (12); The front cylinder (11) is provided with a liquid inlet joint and a liquid outlet joint which are in communication with the cavity of the front cylinder (11), and a deformable waterproof coating is coated on the side of the isolation member (6) facing the front cylinder (11).

2. The ultra-high temperature tuning fork level switch probe according to claim 1, characterized in that: A first hole (112) is formed at one end of the front cylinder (11) away from the rear cylinder (13); the first end of the fork body (2) is located in the first hole (112) and exceeds the end of the front cylinder (11) away from the rear cylinder (13); the excitation source (3) is located at the first end of the fork body (2), and a heat insulating member (4) is provided between the excitation source (3) and the fork body (2).

3. The ultra-high temperature tuning fork level switch probe according to claim 2, characterized in that: The excitation source (3) is a piezoelectric ceramic sleeved on the first end of the fork body (2), and the heat insulating member (4) is a heat insulating sleeve sleeved on the first end of the fork body (2).

4. The ultra-high temperature tuning fork level switch probe according to claim 2, characterized in that: The ultra-high temperature tuning fork level switch probe further comprises a heat insulating pad (5), wherein the heat insulating pad (5) is located between the excitation source (3) and the front cylinder (11).

5. The ultra-high temperature tuning fork level switch probe according to claim 1, characterized in that: The outer peripheral surface of the front cylinder (11) is provided with heat sinks (113).

6. The ultra-high temperature tuning fork level switch probe according to claim 1, characterized in that: The mounting member (12) comprises a first mounting portion (121) and a second mounting portion (122), and an end of the first mounting portion (121) facing the second mounting portion (122) and an end of the second mounting portion (122) facing the first mounting portion (121) are both coated with oxide ceramics.

7. The ultra-high temperature tuning fork level switch probe according to claim 1, characterized in that: A baffle (21) is provided at the second end of the fork body (2); the baffle (21) is located at an end of the rear cylinder (13) away from the front cylinder (11) and is used to close the rear cylinder (13).

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