CN219121477U - Vortex shedding flowmeter probe with wire joint seal - Google Patents

Abstract

The utility model discloses a vortex shedding flowmeter probe with a wire joint seal, which comprises a probe shell, a core column piezoelectric sheet assembly and a wire harness, wherein the probe shell is provided with a wire joint; the lower ends of four wires of the wire harness are respectively connected with the upper ends of four core wires of the core column piezoelectric sheet assembly to form four wire joints; the method is characterized in that: also comprises an outer sealing assembly; the outer sealing assembly comprises a cross insulating partition plate, an inner insulating sleeve and an outer pressing sleeve; the four wire connectors are positioned in the inner insulating sleeve and are mutually separated by the cross insulating partition board; the lower hole Duan Waitao in the outer pressing sleeve is the inner insulating sleeve, and the outer pressing sleeve is filled with sealant. The utility model can realize the strict sealing and separation insulation protection of four wire joints formed by respectively connecting the lower ends of four wires of the wire harness with the upper ends of four core wires of the core column piezoelectric sheet assembly, can prevent the four wire joints from loosening and contacting each other, can assemble and seal the wire joints through the external sealing assembly, has simple operation and can ensure the tightness and signal stability during use.

Description

Vortex shedding flowmeter probe with wire joint seal

Technical Field

The utility model belongs to the technical field of vortex shedding flowmeter, and relates to a vortex shedding flowmeter probe with a wire joint seal.

Background

The vortex street flowmeter (or vortex street flow meter) is a speed type flow meter which is manufactured by using the natural vibration principle of fluid (gas or liquid) and using piezoelectric crystal or differential capacitor as a detection component according to the Karman vortex street theory.

The vortex flowmeter probe as one of its cores converts the pressure signal of the vortex into an electric signal (frequency signal). And then the flow is processed and calculated by circuits such as an amplifying plate, an integrating instrument and the like, and finally the purposes of outputting and displaying the flow metering result are obtained.

A vortex shedding flowmeter probe (see fig. 1-2) commonly adopted in the prior art comprises a probe shell 1, a core column piezoelectric sheet assembly 2 and a wire harness 3; the probe shell 1 is internally provided with a containing cavity 1-1; the stem piezoelectric sheet assembly 2 is inserted into the accommodating cavity 1-1, and an insulating material 4 is filled in a gap between the inner wall of the accommodating cavity 1-1 and the stem piezoelectric sheet assembly 2; the lower ends of four wires 3-1 of the wire harness 3 are respectively connected with the upper ends of four core wires 2-1 of the core column piezoelectric sheet assembly 2 to form four wire joints K; an outer sleeve 7 is fixed at the upper end of the probe shell 1, the four wire joints K are sleeved outside the outer sleeve 7, and the wire harness 3 passes through the outer sleeve 7 upwards and extends outwards; and the outer sleeve 7 is filled with sealant 5-4. The structure can realize that the four wire joints K are sealed and fixed in the outer sleeve 7 at the same time, and the external water or steam can not enter to interfere or influence the performance of the wire joints K and the core column piezoelectric sheet assembly 2. It still has the following disadvantages to be improved:

first, since the four wire joints K have a limited space in the jacket 7, the mutual distance between the four wire joints K is small and the outer shape is thick, and the four wires 3-1 and the four core wires 2-1 are very thin and soft; so that the four wire joints K are pressed by the flow when the sealant 5-4 is injected into the outer sheath 7 so as to be close to each other and not to be seen internally; after the sealant 5-4 is solidified, the four wire joints K are positioned too close to each other (see figure 2) so as to cause unstable performance in use, and the later stage can possibly break down and influence the service life;

secondly, if the outer sleeve 7 is made of stainless steel, the outer sleeve 7 is welded and fixed to the upper end of the probe housing 1 (see fig. 1-2), so that the inner wall of the outer sleeve 7 and the four wire connectors K have the same problems of approaching or contacting each other, and there is a risk of leakage from the outside. If the outer sleeve 7 is made of insulating material, the outer sleeve 7 cannot be welded with the upper end of the probe housing 1 and can only be fixed by using the bolts 5-5 (see fig. 3), but the bolts 5-5 loose after being stressed and vibrated for a long time.

Disclosure of Invention

In order to solve one or more of the above-mentioned problems of the prior art, the present utility model provides a vortex shedding flowmeter probe with a wire joint seal.

In order to achieve the above purpose, the utility model provides a vortex shedding flowmeter probe with a wire joint seal, which comprises a probe shell, a core column piezoelectric plate assembly and a wire harness; the probe shell is internally provided with an accommodating cavity; the core column piezoelectric sheet assembly is inserted into the accommodating cavity, and an insulating material is filled in a gap between the inner wall of the accommodating cavity and the core column piezoelectric sheet assembly; the lower ends of four wires of the wire harness are respectively connected with the upper ends of four core wires of the core column piezoelectric sheet assembly to form four wire joints; the method is characterized in that: also comprises an outer sealing assembly; the outer sealing assembly comprises a cross insulating partition plate, an inner insulating sleeve and an outer pressing sleeve; the four wire connectors are positioned in the inner insulating sleeve and are mutually separated by the cross insulating partition board; a step hole is formed in the outer pressure sleeve, and comprises an upper hole section and a lower hole section; the lower hole Duan Waitao is the inner insulating sleeve, and the wire harness passes through the upper hole section; the lower end of the outer pressure sleeve is fixedly connected with the upper end of the probe shell in a welding way; and the external pressure sleeve is internally filled with sealant.

By adopting the scheme, the lower ends of the four wires of the wire harness are respectively connected with the upper ends of the four wires of the core column piezoelectric sheet assembly to form four wire joints, and the four wire joints are covered by the inner insulating sleeve and the outer insulating sleeve and filled and sealed in the sealing glue, so that external media such as water, steam or liquid and the like can be completely prevented from entering the vortex shedding flowmeter probe to be in conductive contact with the wire joints, the four wires and the core column piezoelectric sheet assembly to interfere signals or short circuit;

secondly, the four wire joints (comprising the lower ends of the four wires and the upper ends of the four core wires of the core column piezoelectric sheet assembly) are mutually separated by four plate parts of the cross insulating partition board, the four wire joints (comprising the lower ends of the four wires and the upper ends of the four core wires of the core column piezoelectric sheet assembly) cannot approach or contact with each other, signals at the wire joints can be ensured to be stable at the same time and isolated from each other and cannot approach or contact with each other to short circuit, and meanwhile, the peripheries of the four wire joints are surrounded by an inner insulating sleeve made of insulating materials to prevent conduction or leakage with an outer pressure sleeve and the outside;

in addition, because the external pressing sleeve is fixedly connected with the probe shell in a welding way, the external pressing sleeve can firmly press the cross insulating partition plate, the internal insulating sleeve and the like which are arranged in the external pressing sleeve without vibration loosening, so that the performance can be kept stable for a long time, and the service life can be prolonged. The inner hole of the outer pressing sleeve adopts a step hole, and the inner insulating sleeve and the cross insulating partition plate are restrained and fixed in the lower hole section of the step hole at the same time so as not to be loose axially.

Further, four anti-rotation grooves are formed in the inner wall of the inner insulating sleeve; the cross insulating partition plates are inserted into the four anti-rotation grooves. Because the four plates of the cross insulating partition plate are respectively inserted into the four anti-rotation grooves of the inner insulating sleeve and are limited to relatively rotate, the assembly can be conveniently carried out, the working efficiency is improved, meanwhile, the relative looseness is prevented, the extrusion acting force can not be generated on the sealant, and the long-term stable sealing can be kept.

Preferably, the cross insulating partition board is made of ceramic materials.

Preferably, the inner insulating sleeve is made of ceramic materials.

Preferably, the outer pressure sleeve is made of stainless steel.

Preferably, the inner diameter of the upper hole section is 5-6mm.

The utility model has the beneficial effects that:

the utility model adopts a structure different from the prior art, can realize that four wire joints formed by connecting the lower ends of four wires of a wire harness with the upper ends of four core wires of a core column piezoelectric sheet assembly are strictly sealed and isolated and insulated, can prevent the four wire joints from loosening and contacting each other, can be assembled and sealed by an external sealing assembly after wire connection, has simple operation and can ensure the tightness and signal stability during use;

secondly, the lower ends of the four wires of the wire harness are respectively connected with the upper ends of the four core wires of the core column piezoelectric sheet assembly to form four wire joints, the four wire joints are covered with the inner and outer double layers of the outer pressure sleeve through the outer insulating sleeve and the inner and outer double layers of the outer pressure sleeve and are filled and sealed through the sealing glue, so that external media such as water, steam or liquid and the like can be completely prevented from entering the vortex street flowmeter probe to be in conductive contact with the wire joints, the four wires, the four core wires and the core column piezoelectric sheet assembly to interfere signals or short circuit;

thirdly, the four wire connectors (comprising the lower ends of the four wires and the upper ends of the four core wires of the core column piezoelectric sheet assembly) are insulated by the cross insulating partition board and are separated from each other, the four wire connectors (comprising the lower ends of the four wires and the upper ends of the four core wires of the core column piezoelectric sheet assembly) are not close to or contacted with each other, so that signals at the wire connectors are stable at the same time and are isolated from each other so as not to be close to or contacted with each other for short circuit, and meanwhile, the peripheries of the four wire connectors are prevented from being conducted with an external pressure sleeve and the outside for electric leakage due to the fact that the peripheries of the four wire connectors are covered by an internal insulating sleeve;

fourth, because the external pressing sleeve is fixedly connected with the probe shell in a welding way, the external pressing sleeve can firmly press the cross insulating partition plate, the internal insulating sleeve and the like which are arranged in the external pressing sleeve without vibration loosening, so that the long-term stability of the performance can be maintained, and the service life of the probe can be prolonged. The inner hole of the outer pressing sleeve adopts a step hole, and the inner insulating sleeve and the cross insulating partition plate are simultaneously restrained and fixed in the lower hole section of the step hole and cannot axially loosen;

fifthly, the utility model is characterized in that the inner wall of the inner insulating sleeve is provided with four anti-rotation grooves; the cross insulating partition plates are inserted into the four anti-rotation grooves. Because the four plates of the cross insulating partition plate are respectively inserted into the four anti-rotation grooves of the inner insulating sleeve and are limited to relatively rotate, the assembly can be conveniently carried out, the working efficiency is improved, meanwhile, the relative looseness is prevented, the extrusion acting force can not be generated on the sealant, and the long-term stable sealing can be kept.

Drawings

Fig. 1 is a schematic structural view of a vortex shedding flowmeter probe in the prior art (when the outer sleeve is welded and fixed with the stainless steel probe housing).

Fig. 2 is an enlarged view at a in fig. 1.

Fig. 3 is a schematic structural diagram of a vortex shedding flowmeter probe in the prior art (when the outer sleeve is fastened with the ceramic probe shell by bolts).

Fig. 4 is a schematic structural view of a vortex shedding flowmeter probe (i.e., the outer seal assembly is assembled and sealed).

Fig. 5 is an enlarged view at B in fig. 4.

Fig. 6 is a view showing a state in which a vortex shedding flowmeter probe according to the present utility model is operated in the first step when the outer seal assembly is assembled.

Fig. 7 is a view (one) showing a state of a vortex shedding flowmeter probe according to the present utility model when the outer seal assembly is assembled in the second step.

Fig. 8 is a state diagram (two) of a vortex shedding flowmeter probe according to the present utility model in a second step of operation when the outer seal assembly is assembled.

Fig. 9 is a view (one) showing a state of a vortex shedding flowmeter probe according to the present utility model when the third step operation is performed in assembling the external seal assembly.

Fig. 10 is a state diagram (two) of a vortex shedding flowmeter probe according to the present utility model in a third step of operation in assembling an external seal assembly.

Fig. 11 is a view showing a state in which a vortex shedding flowmeter probe according to the present utility model is subjected to a fourth step operation when an external seal assembly is assembled.

Fig. 12 is a perspective view of a vortex shedding flowmeter probe of the present utility model in a second step of operation in assembling an external seal assembly.

Fig. 13 is an enlarged view at C in fig. 12.

Fig. 14 is a perspective view of a vortex shedding flowmeter probe according to the present utility model in a fourth step of operation in assembling an external seal assembly.

Detailed Description

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

examples: referring to fig. 4-5, a vortex shedding flowmeter probe with wire-bonded joint seal includes a probe housing 1, a stem piezoelectric patch assembly 2, a wire harness 3, and an external seal assembly 5.

Referring to fig. 4-5, the probe shell 1 is provided with a containing cavity 1-1; the stem piezoelectric sheet assembly 2 is inserted into the accommodating cavity 1-1, and an insulating material 4 is filled in a gap between the inner wall of the accommodating cavity 1-1 and the stem piezoelectric sheet assembly 2; the lower ends of four wires 3-1 of the wire harness 3 are respectively connected with the upper ends of four core wires 2-1 of the core column piezoelectric sheet assembly 2 in a one-to-one winding way, and four wire joints K are formed. Since this part of the structure belongs to the prior art, it is not described in detail (fig. 1-3 can be combined).

Referring to fig. 4-5, the outer seal assembly 5 includes a cross-shaped insulating spacer 5-1, an inner insulating jacket 5-2, and an outer pressure jacket 5-3; the four wire connectors K are located within the inner insulating sleeve 5-2 and are separated from each other by the cross insulating barrier 5-1 (see fig. 12-13). Referring to fig. 13, the cross-shaped insulating spacer 5-1 has four plate portions and is distributed in a cross shape.

Referring to fig. 4-5, a step hole is arranged in the outer pressure sleeve 5-3, and the step hole comprises an upper hole section 5-31 and a lower hole section 5-32; the lower hole section 5-32 is sleeved outside the inner insulating sleeve 5-2, and the wire harness 3 penetrates out of the upper hole section 5-31; the lower end of the outer pressure sleeve 5-3 is fixedly connected with the upper end of the probe shell 1 in a welding way; and the outer pressure sleeve 5-3 is internally filled with sealant 5-4.

Referring to fig. 4-5 or 12, in particular, the inner insulating sleeve 5-2 is of equal length to the lower bore section 5-32, while the outer diameter of the inner insulating sleeve 5-2 matches the inner diameter of the lower bore section 5-32.

Referring to fig. 13, in addition, four anti-rotation grooves 5-21 are uniformly distributed along the circumferential direction of the inner wall of the inner insulating sleeve 5-2; the four plate portions of the cross insulating spacer 5-1 are respectively inserted into the four anti-rotation grooves 5-21 at the time of assembly (see fig. 5). The four plates of the cross insulating partition board 5-1 are respectively inserted into the four anti-rotation grooves 5-21 of the inner insulating sleeve 5-2, so that the cross insulating partition board is limited to relatively rotate, the assembly is convenient, the working efficiency is improved, meanwhile, the cross insulating partition board is prevented from relatively loosening, and extrusion acting force is not generated on the sealant, so that the cross insulating partition board can be stably sealed for a long time.

Preferably, the cross insulating partition 5-1 is made of ceramic material. It can realize insulation, and is high temperature resistant and intensity simultaneously.

Preferably, the inner insulating sleeve 5-2 is made of ceramic. It can realize insulation, and is high temperature resistant and intensity simultaneously.

Preferably, the outer pressure sleeve 5-3 is made of stainless steel. It can prevent rust and can be welded and fixed with the probe housing 1 (also made of steel or iron).

Preferably, the upper hole section 5-31 has an inner diameter of 5-6mm. Since the outer diameter of the complete section (unpeeled section) of the wire harness 3 is 3mm and passes through the upper hole section 5-3, an optimal gap (width 2-3 mm) channel for convenient sealant injection is provided between the wire harness 3 and the upper hole section 5-3.

Specifically, the sealant is preferably an inorganic adhesive and is resistant to high temperatures. For example, model JL-767C is purchased from Dongguan adhesive products Co., ltd.

When the external sealing component 5 is assembled, the utility model comprises the following steps:

the first step, the lower ends of the four wires 3-1 of the wire harness 3 are respectively connected with the upper ends of the four core wires 2-1 of the core column piezoelectric sheet assembly 2 in a one-to-one winding way to form four wire joints K, and the cross insulating partition board 5-1 can be inserted into and separate the four wire joints K from each other in the winding process (see FIG. 6);

secondly, sleeving the inner insulating sleeve 5-2 from top to bottom through the wire harness 3 (see fig. 7 and 12-13), and sleeving the inner insulating sleeve 5-2 on the cross insulating partition 5-1 downwards, wherein the lower end surface of the inner insulating sleeve 5-2 is contacted with the upper end surface of the probe shell 1 (see fig. 8);

thirdly, sleeving the outer pressing sleeve 5-3 on the inner insulating sleeve 5-2 from top to bottom through the wire harness 3 (see fig. 9), and sleeving the outer pressing sleeve 5-3 on the inner insulating sleeve 5-2 downwards, wherein the lower end face of the outer pressing sleeve 5-3 is contacted with the upper end face of the probe shell 1 (see fig. 10);

and fourthly, circumferentially welding and fixing (circumferentially fixing and sealing) the contact part of the lower end face of the outer pressing sleeve 5-3 and the lower end face of the outer pressing sleeve 5-3, and then injecting the sealant 5-4 from the upper port of the upper hole section 5-31 and filling the inside until the sealant 5-4 is solidified to complete the assembly (see fig. 11). And at this time, the four wire connectors (and including the lower ends of the four wires 3-1 of the wire harness 3 and the upper ends of the four core wires 2-2 of the core rod piezoelectric sheet assembly 2), the cross insulating spacer 5-1, the inner insulating bush 5-2, the outer pressing bush 5-3 and the probe housing 1 are simultaneously bonded and fixed as one body by the sealant 5-4 (see fig. 11 and 5).

The utility model has the following characteristics and is analyzed as follows:

firstly, because the lower ends of four wires 3-1 of the wire harness 3 are respectively connected with the upper ends of four core wires 2-1 of the core column piezoelectric sheet assembly 2 to form four wire joints K, the four wire joints K are covered with the inner and outer layers of the outer pressure sleeve 5-3 through the outer and inner insulating sleeve 5-2 and are filled and sealed in the sealing glue 5-4, external media such as water, steam or liquid and the like can be completely prevented from entering the vortex shedding flowmeter probe to be in conductive contact with the wire joints K, the four wires 3-1, the four core wires 2-1 and the probe shell of the core column piezoelectric sheet assembly 2 so as to interfere signals or short circuits;

the second wire connector and the four wire connectors comprise the lower ends of four wires and the upper ends of four core wires of the core column piezoelectric sheet assembly, which are mutually separated by a cross insulation baffle 5-1 in an insulation way, the lower ends of the four wires and the upper ends of the four core wires of the core column piezoelectric sheet assembly are not close to or contacted with each other, signals at the positions of the wire connectors K can be ensured to be stable at the same time and isolated from each other and not close to or contacted with each other to be short-circuited, and meanwhile, the periphery of the four wire connectors K can be prevented from being conducted with the outer pressure sleeve 5-3 and the outside to cause electric leakage due to the fact that the peripheries of the four wire connectors K are covered by the inner insulation sleeve 5-2;

thirdly, because the outer pressing sleeve 5-3 is fixedly connected with the probe shell 1 in a welding way, the outer pressing sleeve 5-3 can firmly press the cross insulating partition plate 5-1, the inner insulating sleeve 5-2 and the like which are arranged in the outer pressing sleeve without vibration loosening, so that the performance can be kept stable for a long time and the service life can be prolonged. The inner hole of the outer pressing sleeve 5-3 adopts a step hole, and the inner insulating sleeve 5-2 and the cross insulating partition plate 5-1 are restrained and fixed in the lower hole section 5-32 of the step hole at the same time and cannot be loosened axially.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (6)

1. A vortex shedding flowmeter probe with a wire joint seal comprises a probe shell (1), a core column piezoelectric sheet assembly (2) and a wire harness (3); the probe shell (1) is internally provided with a containing cavity (1-1); the core column piezoelectric sheet assembly (2) is inserted into the accommodating cavity (1-1), and the lower ends of the four wires (3-1) of the wire harness (3) are respectively connected with the upper ends of the four core wires (2-1) of the core column piezoelectric sheet assembly (2) to form four wire joints (K); the method is characterized in that: also comprises an outer sealing assembly;

the outer sealing assembly comprises a cross insulating partition plate (5-1), an inner insulating sleeve (5-2) and an outer pressing sleeve (5-3); the four wire connectors (K) are positioned in the inner insulating sleeve (5-2) and are mutually separated by the cross insulating partition board (5-1);

a step hole is arranged in the outer pressure sleeve (5-3), and comprises an upper hole section (5-31) and a lower hole section (5-32);

the lower hole section (5-32) is sleeved outside the inner insulating sleeve (5-2), and the wire harness (3) penetrates out of the upper hole section (5-31);

the lower end of the outer pressure sleeve (5-3) is fixedly connected with the upper end of the probe shell (1) in a welding way; and the outer pressure sleeve (5-3) is filled with sealant (5-4).

2. A sealed vortex shedding flowmeter probe with a wire connector as claimed in claim 1, wherein: four anti-rotation grooves (5-21) are formed in the inner wall of the inner insulating sleeve (5-2); the cross insulating partition plates (5-1) are inserted into the four anti-rotation grooves (5-21).

3. A sealed vortex shedding flowmeter probe with a wire connector as claimed in claim 1, wherein: the cross insulating partition board (5-1) is made of ceramic materials.

4. A sealed vortex shedding flowmeter probe with a wire connector as claimed in claim 1, wherein: the inner insulating sleeve (5-2) is made of ceramic materials.

5. A sealed vortex shedding flowmeter probe with a wire connector as claimed in claim 1, wherein: the outer pressure sleeve (5-3) is made of stainless steel.

6. A sealed vortex shedding flowmeter probe with a wire connector as claimed in claim 1, wherein: the inner diameter of the upper hole section (5-31) is 5-6mm.

Images