Liquid level meter probe rod

Abstract

The utility model relates to the technical field of liquid level meters, and provides a liquid level meter probe rod which comprises a mounting sleeve, a connecting axis, a measuring guide rod and a signal transmitting and receiving structure, the signal transmitting and receiving structure is fixed in the mounting sleeve, one end of the connecting axis is inserted into the signal transmitting and receiving structure, and the other end of the connecting axis is connected with the measuring guide rod. One end of the connecting shaft center extends out of the mounting sleeve and is coaxially connected with the measuring guide rod in a sleeving manner, the other end of the connecting shaft center extends out of the mounting sleeve and is coaxially connected with the measuring guide rod in a sleeving manner, a heat insulation filler is filled between the connecting shaft center and the mounting sleeve, a transceiver facing the axis of the connecting shaft center is arranged on the signal transceiving structure, and a steam reflecting plate is convexly arranged on the outer surface of the measuring guide rod; the utility model solves the problem of deviation caused by the influence of saturated steam during liquid level measurement, and has the advantages of simple structure and low manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level gauges, and particularly to a liquid level gauge probe rod. Background Technique

[0002] With the continuous development of process industries such as electric power, chemical industry and medicine, the guided wave radar liquid level gauge has been widely used in the liquid level measurement of various liquid media at present. The measurement principle of the guided wave radar liquid level gauge is to adopt microwave signals, which are emitted through an antenna and transmitted along a waveguide to the surface of the medium. Part of the electromagnetic waves are reflected by the liquid surface and received by the antenna, and then converted into electrical signals. After processing this electrical signal, the height of the liquid level can be obtained.

[0003] When the guided wave radar liquid level gauge is used for liquid level measurement under steam conditions, the vapor side in the container is filled with saturated steam of liquid medium boiling or volatilizing. The speed of the radar wave is slowed down by the influence of the medium steam during the conduction on the vapor side, resulting in an extension of the time from the meter head to receiving the radar wave reflected from the liquid surface. If the variable of the conduction speed being delayed by steam is not calculated into the compensation parameter when the meter head calculates the empty height, it will cause the output liquid level value to be lower than the actual liquid level value. Under typical working conditions of a power plant heat exchanger, the deviation value will reach more than 10% of the measurement range. Content of the Utility Model

[0004] Based on this, in order to solve the problem that the deviation will be caused by the influence of saturated steam during liquid level measurement, the utility model provides a liquid level gauge probe rod, and its specific technical solution is as follows:

[0005] A liquid level gauge probe rod includes a mounting sleeve, a connecting axis, a measuring guide rod and a signal transceiver structure. The signal transceiver structure is fixed in the mounting sleeve. One end of the connecting axis is inserted into the signal transceiver structure, and the other end of the connecting axis extends outside the mounting sleeve and is coaxially sleeved with the measuring guide rod. Heat insulation filler is filled between the connecting axis and the mounting sleeve. A transceiver facing the axis of the connecting axis is provided on the signal transceiver structure. A steam reflector is convexly provided on the outer surface of the measuring guide rod.

[0006] The above liquid level gauge probe realizes high-temperature isolation by setting heat insulation packing, avoiding the problem that heat is transferred to the installation sleeve, which makes it difficult to contact the installation sleeve. By setting a transceiver, the reception and transmission of electromagnetic wave signals are realized. The electromagnetic wave signals are emitted from the transceiver and transmitted along the measuring guide rod to the liquid medium surface. Part of the electromagnetic waves are reflected by the liquid surface to form a reflected signal and received by the transceiver, so that the height information of the liquid level can be obtained. By setting a steam reflector, a reference reflection signal is obtained through the steam reflector with a fixed position. The value of the steam compensation parameter can be calculated by comparing the reception time between the reflection signal and the reference reflection signal, thus solving the problem that the deviation will occur when the liquid level is measured under the influence of saturated steam.

[0007] Further, one end of the signal transceiver structure is threadedly assembled in the installation sleeve, and the other end of the signal transceiver structure is threadedly connected to the connection axis. An insulating space is formed by the cooperation among the signal transceiver structure, the installation sleeve and the connection axis, and the heat insulation packing is filled in the insulating space.

[0008] Further, the signal transceiver structure includes an external thread block, an installation block and an internal thread block sleeved from the outside to the inside in sequence. The outer side wall of the external thread block is threadedly connected to the inner surface of the installation sleeve. The transceiver is arranged in the installation block. One end of the internal thread block is sleeved on the signal end of the transceiver, and a notch is formed in the other end of the internal thread block. The inner side wall of the notch is threadedly connected to the outer surface of the connection axis.

[0009] Further, the heat insulation packing includes upper packing, middle packing and lower packing filled in the insulating space in sequence.

[0010] Further, the liquid level gauge probe further includes a clamping module and a coaxial tube sleeved outside the measuring guide rod. One end of the clamping module is fitted on the outer surface of the installation sleeve, the coaxial tube is fitted on the outer side wall of the other end of the clamping module, a threaded installation interface is arranged on the outer side wall of the clamping module, and the coaxial tube is coaxially arranged with the measuring guide rod.

[0011] Further, a protective cap is threadedly connected to the outer surface of one end of the installation sleeve, and the outer surface of the other end of the installation sleeve is fitted in the clamping module.

[0012] Further, a probe nameplate is detachably fixed on the outer surface of the installation sleeve.

[0013] Further, the coaxial tube and the measuring guide rod are connected and fixed through a support member.

[0014] Further, the material of the connection axis is stainless steel.

[0015] Furthermore, the protective cap is made of plastic. Description of the Drawings

[0016] Figure 1 is a schematic cross-sectional structure diagram of a liquid level gauge probe rod according to an embodiment of the present invention;

[0017] Figure 2 is a partial cross-sectional structure diagram of a liquid level gauge probe rod according to an embodiment of the present invention.

[0018] Description of the Reference Numerals:

[0019] 1. Installation sleeve; 11. Protective cap; 12. Probe rod nameplate; 2. Connecting axis; 3. Measuring guide rod; 4. Signal transceiver structure; 41. Transceiver; 42. External thread block; 43. Installation block; 44. Internal thread block; 5. Heat insulation filler; 51. Upper filler; 52. Middle filler; 53. Lower filler; 6. Steam reflector; 7. Clamping module; 71. Threaded installation interface; 8. Coaxial tube; 9. Support member. Detailed Embodiments

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] In the present invention, the "first" and "second" do not represent specific quantities and sequences, but are only used for name distinction.

[0024] Such as Figure 1 and Figure 2As shown in the figure, a liquid level gauge probe rod in an embodiment of the present utility model includes an installation sleeve 1, a connection axis 2, a measurement guide rod 3, and a signal transceiver structure 4. The signal transceiver structure 4 is fixed inside the installation sleeve 1. One end of the connection axis 2 is inserted into the signal transceiver structure 4, and the other end of the connection axis 2 extends outside the installation sleeve 1 and is coaxially sleeved with the measurement guide rod 3. An insulating filler 5 is filled between the connection axis 2 and the installation sleeve 1. A transceiver 41 is provided on the signal transceiver structure 4 facing the axis of the connection axis 2, and a steam reflection plate 6 is convexly provided on the outer surface of the measurement guide rod 3.

[0025] For the above-mentioned liquid level gauge probe rod, by providing the insulating filler 5, high-temperature isolation is achieved, avoiding the problem that heat is transferred to the installation sleeve 1, resulting in difficulty in contacting the installation sleeve 1. By providing the transceiver 41, the reception and transmission of electromagnetic wave signals are realized. The electromagnetic wave signals are emitted from the transceiver 41 and transmitted along the measurement guide rod 3 to the liquid medium surface. Part of the electromagnetic waves are reflected by the liquid surface to form a reflected signal and received by the transceiver 41, so that the height information of the liquid level can be obtained. By providing the steam reflection plate 6, a reference reflection signal is obtained through the steam reflection plate 6 with a fixed position. The value of the steam compensation parameter can be calculated by comparing the reception time between the reflected signal and the reference reflection signal, thus solving the problem of deviation caused by the influence of saturated steam during liquid level measurement.

[0026] As Figure 1 shown, in one embodiment, one end of the signal transceiver structure 4 is threadedly assembled inside the installation sleeve 1, and the other end of the signal transceiver structure 4 is threadedly connected to the connection axis 2. An insulating space is formed by the cooperation among the signal transceiver structure 4, the installation sleeve 1, and the connection axis 2, and the insulating filler 5 is filled in the insulating space.

[0027] As Figure 1 and Figure 2 shown, in one embodiment, the signal transceiver structure 4 includes an external thread block 42, an installation block 43, and an internal thread block 44 sleeved from the outside to the inside in sequence. The outer side wall of the external thread block 42 is threadedly connected to the inner surface of the installation sleeve 1. The transceiver 41 is arranged inside the installation block 43. One end of the internal thread block 44 is sleeved on the signal end of the transceiver 41, and a notch is provided at the other end of the internal thread block 44. The inner side wall of the notch is threadedly connected to the outer surface of the connection axis 2.

[0028] As Figure 1 and Figure 2 shown, in one embodiment, the insulating filler 5 includes an upper filler 51, a middle filler 52, and a lower filler 53 filled in the insulating space in sequence.

[0029] As Figure 1 and Figure 2As shown, in one embodiment, the liquid level gauge probe further includes a clamping module 7 and a coaxial tube 8 sleeved outside the measuring guide rod 3. One end of the clamping module 7 is fitted on the outer surface of the mounting sleeve 1, the coaxial tube 8 is fitted on the outer side wall of the other end of the clamping module 7, and a threaded mounting interface 71 is provided on the outer side wall of the clamping module 7. The coaxial tube 8 is coaxially arranged with the measuring guide rod 3. By providing the threaded mounting interface 71, it is convenient for the disassembly and assembly of the liquid level gauge probe, which is beneficial for maintenance and repair.

[0030] As Figure 1 and Figure 2 shown, in one embodiment, a protective cap 11 is threadedly connected to the outer surface of one end of the mounting sleeve 1, and the outer surface of the other end of the mounting sleeve 1 is fitted inside the clamping module 7.

[0031] As Figure 1 and Figure 2 shown, in one embodiment, a probe nameplate 12 is detachably fixed on the outer surface of the mounting sleeve 1.

[0032] As Figure 1 shown, in one embodiment, the coaxial tube 8 and the measuring guide rod 3 are connected and fixed by a support member 9.

[0033] Preferably, the material of the connecting axis 2 is stainless steel. Stainless steel has the characteristics of high temperature resistance and corrosion resistance.

[0034] Preferably, the material of the protective cap 11 is plastic. Plastic has electrical insulation performance and heat insulation effect.

[0035] Working principle:

[0036] The electromagnetic wave signal is emitted from the transceiver 41 and transmitted along the measuring guide rod 3 to the liquid medium surface. Part of the electromagnetic wave is reflected by the liquid surface to form a reflected signal and received by the transceiver 41, so that the reflected signal is converted into an electrical signal. After processing the electrical signal, the height information of the liquid level can be obtained. Among them, when the liquid level gauge probe is used for liquid level measurement in a steam working condition, in order to obtain the compensation parameter for the change of the electromagnetic wave conduction speed under the saturated steam working condition, it is necessary to use the steam reflector 6 with a fixed position to obtain a reference reflected signal. By comparing the reception time between the reflected signal and the reference reflected signal, the value of the steam compensation parameter can be calculated, so as to solve the problem of deviation values caused by the influence of saturated steam during liquid level measurement.

[0037] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0038] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A liquid level gauge probe, characterized in that, It includes an installation sleeve, a connecting axis, a measuring guide rod and a signal transceiver structure. The signal transceiver structure is fixed inside the installation sleeve. One end of the connecting axis is inserted into the signal transceiver structure, and the other end of the connecting axis extends outside the installation sleeve and is coaxially sleeved with the measuring guide rod. An insulating filler is filled between the connecting axis and the installation sleeve. A transceiver facing the axis of the connecting axis is provided on the signal transceiver structure, and a steam reflector is convexly provided on the outer surface of the measuring guide rod.

2. The liquid level gauge probe according to claim 1, characterized in that, One end of the signal transceiver structure is threadedly assembled inside the installation sleeve, and the other end of the signal transceiver structure is threadedly connected to the connecting axis. An insulating space is formed by the cooperation among the signal transceiver structure, the installation sleeve and the connecting axis, and the insulating filler is filled in the insulating space.

3. The liquid level gauge probe according to claim 2, characterized in that, The signal transceiver structure includes an external thread block, an installation block and an internal thread block sleeved from outside to inside in sequence. The outer side wall of the external thread block is threadedly connected to the inner surface of the installation sleeve. The transceiver is arranged inside the installation block. One end of the internal thread block is sleeved on the signal end of the transceiver, and a notch is formed in the other end of the internal thread block. The inner side wall of the notch is threadedly connected to the outer surface of the connecting axis.

4. The liquid level gauge probe according to claim 2, characterized in that, The insulating filler includes an upper filler, a middle filler and a lower filler filled in the insulating space in sequence.

5. The level gauge probe according to claim 1, characterized in that, It further includes a clamping module and a coaxial tube covering the outside of the measuring guide rod. One end of the clamping module is fitted on the outer surface of the installation sleeve, the coaxial tube is fitted on the outer side wall of the other end of the clamping module, a threaded installation interface is provided on the outer side wall of the clamping module, and the coaxial tube is coaxially arranged with the measuring guide rod.

6. The liquid level gauge probe according to claim 5, wherein A protective cap is threadedly connected to the outer surface of one end of the installation sleeve, and the outer surface of the other end of the installation sleeve is fitted inside the clamping module.

7. The liquid level gauge probe according to claim 1, characterized in that, A probe nameplate is detachably fixed on the outer surface of the installation sleeve.

8. The liquid level gauge probe according to claim 5, characterized in that, The coaxial tube and the measuring guide rod are fixedly connected by a support member.

9. The liquid level gauge probe according to claim 1, characterized in that, The material of the connecting axis is stainless steel.

10. The liquid level gauge probe according to claim 6, characterized in that, The material of the protective cap is plastic.

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