CN216524223U - Diaphragm type differential pressure liquid level transmitter - Google Patents
Diaphragm type differential pressure liquid level transmitter Download PDFInfo
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- CN216524223U CN216524223U CN202122369723.7U CN202122369723U CN216524223U CN 216524223 U CN216524223 U CN 216524223U CN 202122369723 U CN202122369723 U CN 202122369723U CN 216524223 U CN216524223 U CN 216524223U
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Abstract
The utility model relates to the technical field of pressure transmitters, in particular to a diaphragm type differential pressure liquid level transmitter, which comprises a transmitter body and a flange used for installing the transmitter body in a closed tank, wherein positive pressure capillary holes and negative pressure guide holes which penetrate through two sides of the flange and are arranged at intervals are arranged on the flange; the negative pressure guide hole is communicated with the transmitter body through a negative pressure side pressure guide pipe; the base pipe is arranged between the flange and the transmitter body and is provided with a capillary channel which is communicated up and down, the upper end of the capillary channel is communicated to the positive pressure side of the transmitter body, the lower end of the capillary channel is communicated to the positive pressure capillary hole, and the lower end of the positive pressure capillary hole is communicated to a positive side pressure sensing part below the liquid level through a positive pressure side pressure guide pipe. The utility model simplifies the structure of the differential pressure liquid level transmitter and can be used for liquid level measurement of high-temperature liquid with strong liquid level fluctuation.
Description
Technical Field
The utility model relates to the technical field of pressure transmitters, in particular to a diaphragm type differential pressure liquid level transmitter.
Background
The diaphragm pressure transmitter is an automatic instrument for measuring fluid pressure in the industrial field, and mainly comprises a pressure measuring probe, a capillary tube, filling liquid and a pressure transmitting head, wherein an elastic metal diaphragm is arranged at one end of the pressure measuring probe, and a closed cavity is formed between the elastic metal diaphragm and the pressure measuring probe; the pressure measuring probe is provided with a filling port for filling liquid into the closed cavity; one end of the capillary tube is communicated with the closed cavity.
At present, drop-in level transmitters are mainly used for level measurement of open tanks or closed tanks. For the liquid level measurement of the closed tank, the gas phase at the upper part of the closed tank has pressure, so that the adoption of the input type liquid level timing relies on the differential pressure principle, namely the upper end gas is connected with the negative pressure side of the transmitter body, the lower end liquid is connected with the positive pressure side of the transmitter body (the pressure value sensed by the positive side is the sum of the pressure of the liquid level and the pressure of the gas phase), and the liquid level height measurement is carried out according to the difference value of the positive pressure side and the negative pressure side.
CN 209197846U discloses a diaphragm type drop-in level transmitter, which can solve the liquid level measurement of the closed container in some common situations, but still has the following disadvantages: (1) the capillary tube is flexible and is immersed in liquid, the capillary tube is bent (because the capillary tube needs to leave allowance when the liquid level meter is manufactured, otherwise, the protective cover cannot sink to the bottom of the container), when the liquid level in the tank fluctuates greatly, the capillary tube can shake, so that the measured value of the transmitter fluctuates, the measured result has errors, and the shaking can cause the breakage possibly caused after repeated bending among the connection part of the upper part of the capillary tube and the hot melt adhesive of the air guide tube, the lower part of the capillary tube and the pressure sensing part; (2) the surface of the capillary is coated with PVC, and if the PVC surface is damaged during construction, the capillary can not be used easily due to medium corrosion and filling liquid leakage; (3) the PVC material coated on the surface of the capillary and the hot melt adhesive sleeve for fixing the capillary are non-metallic materials, the temperature resistance of which is generally not more than 200 ℃, so that the non-metallic materials cannot be used in occasions with relatively high medium temperature; (4) the end protective cover is large and is not suitable for being installed on occasions with liquid level meter wave guide tubes; (5) still need set up coplane fixing base between changer body and the flange, the structure is complicated.
In conclusion, the existing diaphragm type differential pressure liquid level transmitter adopts a flexible capillary tube, the structure is complex, the measurement result is greatly influenced by the environment in the tank, and the problems that the connection position is easy to break and the application range is narrow exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art, the positive pressure side structure of the existing diaphragm type input liquid level transmitter is complex, and when the height of the fluctuation liquid level in a closed container is measured, the measurement result is unstable and the temperature application range is narrow.
In order to achieve the aim, the utility model provides a diaphragm type differential pressure liquid level transmitter, which comprises a transmitter body, wherein the transmitter body is arranged on one side of a flange, and a positive pressure capillary hole and a negative pressure guide hole are respectively and independently arranged on the flange; the diaphragm type differential pressure liquid level transmitter also comprises a negative pressure side pressure guide pipe, one end of the negative pressure side pressure guide pipe is communicated with the negative pressure guide hole, and the other end of the negative pressure side pressure guide pipe is communicated with the negative pressure side of the transmitter body;
the flange passes through basic union coupling with the changer body, be provided with capillary canal in the basic union coupling, positive side sense splenium that connects through malleation side pressure pipe is installed to the opposite side of flange, the one end in capillary canal and the malleation side intercommunication of changer body, the other end and malleation capillary pore intercommunication, positive side sense splenium still communicates to malleation capillary via malleation side pressure pipe.
Preferably, the positive pressure side pressure guide pipe is made of rigid material; or a rigid sleeve is coated outside the positive pressure side pressure guide pipe.
Preferably, the pore diameter of the negative pressure guide pore is larger than that of the positive pressure capillary pore.
Preferably, the outer diameter of the positive pressure side pressure guide pipe is 6-22 mm.
Preferably, a first joint is arranged at an orifice of one side of the negative pressure guide hole, which is close to the transmitter body, and the first joint is communicated to the negative pressure side of the transmitter body through a negative pressure side pressure guide pipe; the negative pressure side pressure guide pipe is connected to the negative pressure side of the transmitter body through a second connector.
Preferably, the positive side pressure sensing part comprises a diaphragm seat, an isolation diaphragm is arranged at the bottom end of the diaphragm seat, a vertically through flow channel is arranged on the diaphragm seat, and the upper end of the flow channel is communicated to the positive pressure side pressure guide pipe.
Preferably, the membrane seat comprises a circular truncated cone-shaped upper membrane seat and a lower membrane seat connected with the upper membrane seat.
Preferably, the ratio of the outer diameter to the inner diameter of the positive pressure side pressure pipe 7 is 3 to 44: 1.
preferably, the top end of the positive pressure side pressure guide pipe and the bottom end of the flange are fixed through welding.
Preferably, the bottom end of the positive pressure side pressure pipe is fixed with the diaphragm seat through welding.
Through the technical scheme, the base pipe is directly adopted to communicate the transmitter body and the flange, connection structures such as a coplanar fixing seat and the like are not needed, the structure of the diaphragm type differential pressure liquid level transmitter is simplified, and the positive pressure side pressure pipe is made of metal materials, so that the positive pressure side pressure pipe can be used for liquid level measurement of high-temperature liquid and strong liquid level fluctuation.
Drawings
FIG. 1 is a schematic diagram of a diaphragm type differential pressure level transmitter in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural view of a positive pressure sensing unit according to an embodiment of the present invention.
Description of the reference numerals
1. Transmitter body 2, parent tube
3. Flange 4, negative pressure side pressure pipe
5. Second joint 6, first joint
7. Positive pressure side pressure pipe 8, diaphragm seat
9. Isolating diaphragm 21 and capillary channel
31. Positive pressure capillary hole 32 and negative pressure guide hole
81. Accommodating space 82 and flow passage
83. An upper die holder 84 and a lower die holder
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic diagram of a diaphragm type differential pressure level transmitter in accordance with an embodiment of the present invention; as shown in fig. 1, the present invention provides a diaphragm type differential pressure liquid level transmitter, which comprises a transmitter body 1, wherein the transmitter body 1 is installed on one side of a flange 3, and the flange 3 is respectively and independently provided with a positive pressure capillary hole 31 and a negative pressure guide hole 32; the diaphragm type differential pressure liquid level transmitter further comprises a negative pressure side pressure guide pipe 4, one end of the negative pressure side pressure guide pipe 4 is communicated with the negative pressure guide hole 32, and the other end of the negative pressure side pressure guide pipe is communicated with the negative pressure side of the transmitter body 1;
the flange 3 is connected with the transmitter body 1 through a base pipe 2, a capillary channel 21 is arranged in the base pipe 2, a positive side pressure sensing part connected through a positive pressure side pressure guide pipe 7 is installed on the other side of the flange 3, one end of the capillary channel 21 is communicated with the positive pressure side of the transmitter body 1, the other end of the capillary channel is communicated with the positive pressure capillary hole 31, and the positive side pressure sensing part is communicated to the positive pressure capillary hole 31 through the positive pressure side pressure guide pipe 7.
In the utility model, the bottom end of the transmitter body 1 can be directly connected with the flange 3 through the base pipe 2 without using connecting pieces such as a fixed seat and the like, thereby simplifying the structure of the liquid level transmitter.
In the present invention, the positive pressure side conductive pipe 7 is filled with a filling liquid, which is known to those skilled in the art and may be, for example, silicone oil.
In the utility model, the first pressure sensing probe is arranged in the positive pressure sensing part and can acquire the pressure P of the liquid phase in the closed tankLiquid for treating urinary tract infectionAnd pressure P of the gas phaseQi (Qi)Pressure sum P ofGeneral assembly(ii) a A second pressure sensing probe is arranged in the negative pressure guide hole 32 and can acquire the pressure P of the gas phase in the closed tankQi (Qi)(ii) a According to PGeneral assemblyAnd PQi (Qi)The difference of (A) can be used to calculate the pressure P of the liquid phaseLiquid for treating urinary tract infectionAt a pressure P in accordance with the liquid phaseLiquid for treating urinary tract infectionAnd obtaining the liquid level height of the liquid phase by quantitative relation with the liquid level height.
In the present invention, in order to avoid the blockage of the negative pressure leading pipe, it is preferable that the negative pressure leading hole is larger than the pore diameter of the positive pressure capillary pore 31.
In some preferred embodiments of the present invention, the positive pressure side pressure pipe 7 is made of a rigid material, or a rigid sleeve is wrapped around the positive pressure side pressure pipe 7. Under the preferable conditions, the positive pressure side pressure guide pipe 7 has better rigidity, and when the liquid level fluctuates, the positive pressure side pressure guide pipe 7 cannot shake along with the fluctuation of the liquid level, so that the accuracy of the measurement result is improved; in addition, the rigid material can resist high temperature, so that the rigid material can measure the liquid level of high-temperature liquid, and the high-temperature limit of the rigid material is only limited by the temperature limit of the filling liquid. Under the optimal condition, the positive pressure side pressure conducting pipe 7 is made of stainless steel; further, when the liquid in the closed tank is corrosive, other corrosion-resistant rigid materials can be selected.
In the present invention, the outer diameter of the positive pressure side pressure pipe 7 may be selected so that the positive pressure side pressure pipe 7 maintains appropriate rigidity according to the height of the measured liquid level and the fluctuation of the liquid level in the tank, and is preferably 6 to 22mm, more preferably 10 to 18mm, and may be, for example, any value in the range of 10mm, 12mm, 14mm, 16mm, 18mm, or any two of the above values.
In some preferred embodiments of the present invention, a first joint 6 is disposed at a side port of the negative pressure guide hole 32 adjacent to the transmitter body, and the first joint 6 is communicated to the negative pressure side of the transmitter body 1 through a negative pressure side pressure guide pipe 4; further preferably, the negative pressure side pressure pipe 4 is connected to the negative pressure side of the transmitter body 1 through a second joint 5.
In some preferred embodiments of the present invention, the positive pressure sensing portion includes a diaphragm seat 8, an isolation diaphragm 9 is disposed at a bottom end of the diaphragm seat 8, a flow passage 82 is disposed on the diaphragm seat 8 and extends vertically, and an upper end of the flow passage 82 is communicated to the positive pressure side pressure pipe 7.
According to the utility model, the bottom of the diaphragm seat 8 and the isolation diaphragm 9 preferably form an accommodating space 81. Further preferably, the accommodating space 81 and the flow channel 82 are filled with filling liquid, which is known to those skilled in the art and may be, for example, silicone oil.
According to the utility model, under a preferable condition, the diaphragm seat comprises a circular truncated cone-shaped upper diaphragm seat 83 and a lower diaphragm seat 84 connected with the upper diaphragm seat 83, the outer diameter of the lower diaphragm seat 84 is 76mm, and the ratio of the outer diameter to the inner diameter of the positive pressure side pressure pipe 7 is 3-44: 1; further preferably, the outer diameter of the positive pressure side pressure pipe 7 is 6 to 22mm, and the inner diameter of the positive pressure side pressure pipe 7 is 0.5 to 2.5 mm. In the above preferred embodiment, the bottom of the positive pressure sensing unit does not need to be provided with a protective cover, and can be used for measuring a liquid level in a closed tank having a small diameter, for example, a liquid level in a tank having a waveguide.
In order to enable the diaphragm type differential pressure level transmitter to be used for level measurement of high temperature liquid, the upper diaphragm seat 83 and the lower diaphragm seat 84 are preferably made of metal, such as stainless steel.
In order to avoid the influence on the service life of the diaphragm type differential pressure liquid level transmitter caused by the fracture of the joint of each component when liquid shakes violently, under the optimal condition, the top end of the positive pressure side pressure pipe 7 and the bottom end of the flange 3 are fixed by welding; further preferably, the bottom end of the positive pressure side pressure pipe 7 and the diaphragm seat 8 are fixed by welding.
In the present invention, since the positive pressure side pressure pipe 7 and the diaphragm seat 8 are both made of rigid metal materials, the diaphragm type differential pressure liquid level transmitter can be used for liquid level measurement of high temperature liquid.
In the utility model, a processor is also arranged in the transmitter body 1, and the processor is respectively electrically connected with the first pressure sensing probe and the second pressure sensing probe and is used for acquiring the pressure P of the liquid phase according to the first pressure sensing probeLiquid for medical purposeAnd pressure P of the gas phaseQi (Qi)Pressure sum P ofGeneral assemblyAnd the pressure P of the gas phase obtained by the second pressure sensing probeQi (Qi)Calculating the liquid phase pressure PLiquid for treating urinary tract infection(ii) a And according to PLiquid for treating urinary tract infectionThe level of the liquid phase is calculated, the type of processor being well known to those skilled in the art.
When the diaphragm type differential pressure liquid level transmitter provided by the utility model is adopted to measure the liquid level of the closed tank, the method comprises the following steps: placing a positive pressure side pressure guide pipe 7 below the flange 3 in the closed tank, wherein the positive pressure sensing part is placed below the liquid level and is used for acquiring the pressure P of the liquid phaseLiquid for treating urinary tract infectionAnd pressure P of the gas phaseQi (Qi)Pressure sum P ofGeneral assembly；
The flange 3 and the part above the flange are arranged above the liquid level, and the second pressure sensing probe in the negative pressure guide hole can acquire the pressure P of the gas phase in the closed tankQi (Qi)；
The processor in the transmitter body 1 can be according to PGeneral assemblyAnd PQi (Qi)Calculating the pressure P of the liquid phaseLiquid for treating urinary tract infectionAnd according to PLiquid for treating urinary tract infectionAnd calculating to obtain the liquid level of the liquid phase.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical spirit of the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A diaphragm type differential pressure liquid level transmitter comprises a transmitter body (1), wherein the transmitter body (1) is arranged on one side of a flange (3), and a positive pressure capillary hole (31) and a negative pressure guide hole (32) are respectively and independently arranged on the flange (3); the diaphragm type differential pressure liquid level transmitter is characterized by further comprising a negative pressure side pressure guide pipe (4), wherein one end of the negative pressure side pressure guide pipe (4) is communicated with a negative pressure guide hole (32), and the other end of the negative pressure side pressure guide pipe is communicated with the negative pressure side of the transmitter body (1);
flange (3) are connected through parent tube (2) with changer body (1), be provided with capillary pore (21) in parent tube (2), the positive side sense splenium of connecting through malleation side pressure pipe (7) is installed to the opposite side of flange (3), the one end in capillary pore (21) and the malleation side intercommunication of changer body (1), the other end and malleation capillary hole (31) intercommunication, positive side sense splenium still communicates to malleation capillary hole (31) via malleation side pressure pipe (7).
2. The diaphragm-type differential pressure liquid level transmitter according to claim 1, wherein the positive pressure side pressure pipe (7) is made of a rigid material; or a rigid sleeve is coated outside the positive pressure side pressure guide pipe (7).
3. The diaphragm-type differential pressure level transmitter according to claim 1, wherein the pore diameter of the negative pressure pilot hole (32) is larger than the pore diameter of the positive pressure capillary hole (31).
4. The diaphragm-type differential pressure liquid level transmitter according to claim 3, wherein the positive pressure side pressure pipe (7) has an outer diameter of 6 to 22 mm.
5. The diaphragm type differential pressure liquid level transmitter according to claim 1, wherein the negative pressure pilot hole (32) is provided with a first joint (6) near an orifice at one side of the transmitter body, and the first joint (6) is communicated to the negative pressure side of the transmitter body (1) through a negative pressure side pressure guide pipe (4);
and the negative pressure side pressure guide pipe (4) is connected to the negative pressure side of the transmitter body (1) through a second connector (5).
6. The diaphragm type differential pressure liquid level transmitter according to claim 1, wherein the positive side pressure sensing portion comprises a diaphragm seat (8), an isolation diaphragm (9) is provided at a bottom end of the diaphragm seat (8), a flow passage (82) is provided in the diaphragm seat and extends vertically therethrough, and an upper end of the flow passage (82) is communicated to the positive pressure side pressure pipe (7).
7. The diaphragm type differential pressure liquid level transmitter of claim 6, wherein the diaphragm seat (8) comprises a truncated cone shaped upper diaphragm seat (83) and a lower diaphragm seat (84) connected with the upper diaphragm seat (83).
8. The diaphragm-type differential pressure liquid level transmitter according to claim 7, wherein the ratio of the outer diameter to the inner diameter of the positive pressure side pressure pipe (7) is 3 to 44: 1.
9. the diaphragm-type differential pressure liquid level transmitter according to claim 8, wherein the top end of the positive pressure side pressure pipe (7) and the bottom end of the flange (3) are fixed by welding.
10. The diaphragm type differential pressure liquid level transmitter according to any one of claims 6 to 9, wherein a bottom end of the positive pressure side pressure pipe (7) is fixed to the diaphragm seat (8) by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122369723.7U CN216524223U (en) | 2021-09-28 | 2021-09-28 | Diaphragm type differential pressure liquid level transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122369723.7U CN216524223U (en) | 2021-09-28 | 2021-09-28 | Diaphragm type differential pressure liquid level transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216524223U true CN216524223U (en) | 2022-05-13 |
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ID=81520166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122369723.7U Active CN216524223U (en) | 2021-09-28 | 2021-09-28 | Diaphragm type differential pressure liquid level transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216524223U (en) |
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2021
- 2021-09-28 CN CN202122369723.7U patent/CN216524223U/en active Active
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