CN215842913U - Constant pressure maintaining device for glass kettle - Google Patents
Constant pressure maintaining device for glass kettle Download PDFInfo
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- CN215842913U CN215842913U CN202121883175.3U CN202121883175U CN215842913U CN 215842913 U CN215842913 U CN 215842913U CN 202121883175 U CN202121883175 U CN 202121883175U CN 215842913 U CN215842913 U CN 215842913U
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Abstract
The utility model relates to the technical field of chemical product preparation, and discloses a constant pressure maintaining device for a glass kettle, which comprises a U-shaped communicating pipe, wherein the communicating pipe is filled with sealing liquid, an air inlet pipe at the air inlet end of the communicating pipe, a first liquid collecting pipe and a first backflow pipe are communicated with an air inlet of the glass kettle, the air outlet end of the communicating pipe is communicated with a subsequent treatment device through an air outlet pipe, a second liquid collecting pipe and a second backflow pipe, a first backflow valve is arranged on the first backflow pipe, a second backflow valve is arranged on the second backflow pipe, a nitrogen branch is arranged at the top of the second liquid collecting pipe, a liquid discharging valve is arranged at the bottom end of the communicating pipe, a liquid collecting tank is arranged below the liquid discharging valve, and a liquid feeding pump is communicated with the communicating pipe through a liquid inlet pipe and is used for feeding the sealing liquid in the liquid collecting tank into the liquid inlet pipe. The constant pressure maintaining device for the glass kettle realizes the dynamic balance of pressure in the glass kettle when the pressure is over-pressure, can also prevent the problem that the sealing liquid pollutes products when the glass kettle is vacuumized and sucked back or the air outlet is over-pressure, and has simple and reliable structure and strong practicability.
Description
Technical Field
The utility model relates to the technical field of chemical product preparation, in particular to a constant pressure maintaining device for a glass kettle.
Background
A series of glass kettles are required in the existing high-purity antimony production flow, antimony trichloride in the glass kettles and chlorine react with each other to release gas in the production flow, and meanwhile, the devices and pipelines can cause the solidification of materials to block the corresponding pipelines of the glass kettles due to inadequate heat preservation, so that the operation can cause the overpressure of the glass kettles. The pressure resistance of the glass kettle is low and is only about 0.1MPA, and the overpressure of the glass kettle can possibly cause the bursting of the glass kettle, so that highly toxic materials such as antimony trichloride, chlorine and the like in the glass kettle are leaked, and personnel injury and environmental pollution are caused.
Therefore, in order to protect the glass kettle in production and avoid production accidents, a proportional control valve, a flowmeter, a pressure gauge, a rupture disc and a nitrogen seal valve are usually adopted to control the overpressure problem of the glass kettle from the pressure resistance degree of the glass kettle and the chemical properties of dry chlorine and antimony trichloride for reaction, and the original scheme has higher cost and later maintenance cost due to higher requirements of the corresponding valve and instrument due to the strong corrosivity of the dry chlorine and the antimony trichloride; no nitrogen sealing valve aiming at corrosive materials exists in the market, the manufacturing cost is further improved by customizing the nitrogen sealing valve, and the effective use of the nitrogen sealing valve cannot be guaranteed; the pressure gauge and the rupture disk can also cause failure due to the condensation of antimony trichloride on the surface of the rupture disk, and great ammonia risk exists.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model aims to provide a constant pressure maintaining device for a glass kettle, which has the advantages of simple and reliable structure, strong practicability and the like.
Based on the above, the utility model provides a constant pressure maintaining device for a glass kettle, which comprises a communicating pipe arranged in a U shape, wherein the communicating pipe is filled with sealing liquid, the air inlet end of the communicating pipe is communicated with the air inlet of the glass kettle through an air inlet adjusting component, and the air outlet end of the communicating pipe is communicated with a subsequent processing device through an air outlet adjusting component;
the air inlet adjusting assembly comprises an air inlet pipe, a first liquid collecting pipe and a first return pipe, the first liquid collecting pipe is communicated with an air inlet of the glass kettle, the air inlet pipe and the first return pipe are used for communicating the first liquid collecting pipe and the communicating pipe, and a first return valve is arranged on the first return pipe;
the air outlet adjusting assembly comprises an air outlet pipe, a second liquid collecting pipe and a second return pipe, the second liquid collecting pipe is communicated with the subsequent treatment device, the air outlet pipe and the second return pipe are used for communicating the second liquid collecting pipe and the communicating pipe, and a second return valve is arranged on the second return pipe;
and a nitrogen branch is arranged at the top of the second liquid collecting pipe and used for introducing nitrogen into the second liquid collecting pipe.
In some embodiments of the present application, a liquid discharging valve is disposed at a bottom end of the communicating pipe.
In some embodiments of the present application, a liquid collecting tank for collecting the sealing liquid in the communicating pipe is disposed below the communicating pipe.
In some embodiments of the present application, a baffle is disposed within the sump.
In some embodiments of the present application, the baffle plates are provided in a plurality, and each of the baffle plates is disposed in parallel.
In some embodiments of this application, including the liquid feeding subassembly, the liquid feeding subassembly includes liquid feeding pump and feed liquor pipe, the one end of liquid feeding pump is inserted in the collecting tank, the other end of liquid feeding pump pass through the feed liquor pipe with the closed tube is linked together.
In some embodiments of the present application, a liquid inlet valve is disposed on the liquid inlet pipe.
In some embodiments of the present application, the charge pump is a diaphragm pump.
In some embodiments of the present application, a demister is disposed at a top of the second liquid collecting pipe.
In some embodiments of the present application, the communicating pipe is made of teflon.
The embodiment of the utility model provides a constant pressure maintaining device for a glass kettle, which has the following beneficial effects compared with the prior art:
the embodiment of the utility model provides a constant pressure maintaining device of a glass kettle, which comprises a U-shaped communicating pipe, wherein the communicating pipe is filled with sealing liquid, the air inlet end of the communicating pipe is communicated with the air inlet of the glass kettle through an air inlet adjusting component, the air outlet end of the communicating pipe is communicated with a subsequent processing device through an air outlet adjusting component, the air inlet adjusting component comprises an air inlet pipe, a first liquid collecting pipe and a first return pipe, the first liquid collecting pipe is communicated with the air inlet of the glass kettle, the air inlet pipe and the first return pipe are used for communicating the first liquid collecting pipe and the communicating pipe, the first return pipe is provided with a first return valve, the air outlet adjusting component comprises an air outlet pipe, a second liquid collecting pipe and a second return pipe, the second liquid collecting pipe is communicated with the subsequent processing device, the air outlet pipe and the second return pipe are used for communicating the second liquid collecting pipe and the communicating pipe, the second return valve is arranged on the second return pipe, the top of the second liquid collecting pipe is also provided with a nitrogen branch, used for introducing nitrogen into the second liquid collecting pipe. Based on the structure, before use, the whole constant pressure maintaining device of the glass kettle is arranged beside the glass kettle and fastened, sealing liquid is introduced into the communicating pipe, at the moment, because both ends of the communicating pipe are communicated with the outside, the liquid level of the sealing liquid at both sides of the communicating pipe is equal, then, the air inlet of the first liquid collecting pipe is communicated with the air outlet of the glass kettle, nitrogen is introduced into the glass kettle through the air inlet of the glass kettle, the pressure of the whole glass kettle is gradually increased along with the reaction in the glass kettle, when the glass kettle has overpressure, the nitrogen in the kettle enters the first liquid collecting pipe from the air outlet of the glass kettle and continuously reaches the position of the sealing liquid in the communicating pipe from the air inlet pipe, the sealing liquid in the communicating pipe flows to the second liquid collecting pipe along the air outlet pipe under the action of the nitrogen pressure and forms a certain liquid level difference in the communicating pipe, when the pressure of the sealing liquid formed by the liquid level difference is more than or equal to the pressure in the glass kettle, the gas in the glass kettle is blocked in the communicating pipe and cannot overflow, when the pressure in the glass kettle exceeds the pressure of the sealing liquid, the sealing liquid flows into the second liquid collecting pipe, redundant nitrogen in the glass kettle flows to the subsequent processing device through an outlet of the second liquid collecting pipe, meanwhile, the sealing liquid in the second liquid collecting pipe flows back into the communicating pipe through the second backflow pipe, the nitrogen in the glass kettle continuously flows out through the air inlet pipe, the communicating pipe and the air outlet pipe until the pressure in the glass kettle is smaller than or equal to the pressure of the sealing liquid, the liquid level in the communicating pipe does not change any more, the whole constant-pressure maintaining device of the glass kettle tends to be stable, a certain nitrogen seal is formed in the first liquid collecting pipe and the air inlet pipe, and the normal operation of the reaction in the glass kettle is ensured; furthermore, as a large amount of chlorine is consumed by chlorination reaction in the glass kettle, in order to ensure that nitrogen can be continuously introduced into the glass kettle in the pressure reaction process in the glass kettle, the situation that the nitrogen cannot be switched in time can occur at the end point of the reaction, a certain vacuum is generated in the glass kettle at the moment, the sealing liquid in the communicating pipe is sucked into the first liquid collecting sleeve, the air inlet pipe, the communicating pipe and the air outlet pipe are communicated again, in order to ensure the concentration of the nitrogen sucked from the air outlet, a nitrogen branch is connected to the second liquid collecting pipe to continuously introduce the nitrogen into the second liquid collecting pipe, the nitrogen supplemented by the air outlet is sucked into the glass kettle to break the vacuum, the sealing liquid in the first liquid collecting pipe also flows back to the communicating pipe through the first return pipe in the process, the pressure in the glass kettle is recovered to be normal at a certain time point along with the continuous increase of the introduction volume of the nitrogen, at the moment, the sealing liquid completely returns to the communicating pipe and cuts off the communication between the air inlet pipe and the air outlet pipe, and the constant-pressure protection device of the glass kettle automatically returns to the initial constant-pressure protection state. In addition, the first backflow valve arranged on the first backflow pipe and the second backflow valve arranged on the second backflow pipe can also reasonably control the time for the sealing liquid to return to the communicating pipe, and the rapid circulation of nitrogen is guaranteed. So, operating personnel only need can realize the adaptation to glass cauldron internal pressure fast through the liquid column height of adjusting sealed liquid, and the pressure in the glass cauldron can be guaranteed to this structure all the time and is in normal level simultaneously, avoids the glass cauldron to take place unexpected harm staff because of the superpressure, has promoted the stability of glass cauldron.
Drawings
FIG. 1 is a schematic structural view of a constant pressure maintaining apparatus for a glass tank according to an embodiment of the present invention.
In the figure, 1, a communicating pipe; 2. sealing liquid; 3. an air inlet pipe; 4. a first liquid collection pipe; 5. a first return pipe; 6. a first reflux valve; 7. a second liquid collecting pipe; 8. an air outlet pipe; 9. a second return pipe; 10. a second reflux valve; 11. a liquid adding pump; 12. a liquid inlet pipe; 13. a liquid inlet valve; 14. a tapping valve; 15. a liquid collecting tank; 16. a demister.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
It should be understood that the terms "front", "rear", and the like are used herein to describe various information, but the information should not be limited to these terms, which are used only to distinguish one type of information from another. For example, "front" information may also be referred to as "rear" information, and "rear" information may also be referred to as "front" information without departing from the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a constant pressure maintaining device for a glass kettle, which includes a U-shaped communicating pipe 1, wherein the communicating pipe 1 is filled with a sealing liquid 2, an air inlet end of the communicating pipe 1 is communicated with an air inlet of the glass kettle through an air inlet adjusting assembly, and an air outlet end of the communicating pipe 1 is communicated with a subsequent processing device through an air outlet adjusting assembly; particularly, the adjusting part admits air includes intake pipe 3, first collector tube 4 and first return pipe 5, first collector tube 4 is linked together with the air inlet of glass cauldron, intake pipe 3 and first return pipe 5 are used for communicateing first collector tube 4 and closed tube 1, be equipped with first reflux valve 6 on the first return pipe 5, the adjusting part of giving vent to anger includes outlet duct 8, second collector tube 7 and second return pipe 9, second collector tube 7 is linked together with follow-up processing apparatus, outlet duct 8 and second return pipe 9 are used for communicateing second collector tube 7 and closed tube 1, be equipped with second reflux valve 10 on the second return pipe 9, the top of second collector tube 7 still is equipped with the nitrogen gas branch road, be used for letting in nitrogen gas in to second collector tube 7.
Based on the structure, before use, the whole constant pressure maintaining device of the glass kettle is arranged beside the glass kettle and fastened, sealing liquid 2 is introduced into the communicating pipe 1, at the moment, because both ends of the communicating pipe 1 are communicated with the outside, the liquid level of the sealing liquid 2 at both sides of the communicating pipe 1 is equal, then the air inlet of the first liquid collecting pipe 4 is communicated with the air outlet of the glass kettle, nitrogen is introduced into the glass kettle through the air inlet of the glass kettle, the pressure of the whole glass kettle is gradually increased along with the reaction in the glass kettle, when the glass kettle has overpressure, the nitrogen in the kettle enters the first liquid collecting pipe 4 from the air outlet of the glass kettle and continuously reaches the position of the sealing liquid 2 in the communicating pipe 1 from the air inlet pipe 3, the sealing liquid 2 in the communicating pipe 1 flows to the second liquid collecting pipe 7 along the air outlet pipe 8 under the action of the nitrogen pressure and forms a certain liquid level difference in the communicating pipe 1, when the pressure of the sealing liquid 2 formed by the liquid level difference is more than or equal to the pressure in the glass kettle, the gas in the glass kettle is blocked in the communicating pipe 1 and cannot overflow, when the pressure in the glass kettle exceeds the pressure of the sealing liquid 2, the sealing liquid 2 flows into the second liquid collecting pipe 7, redundant nitrogen in the glass kettle flows to a subsequent processing device through an outlet of the second liquid collecting pipe 7, meanwhile, the sealing liquid 2 in the second liquid collecting pipe 7 flows back into the communicating pipe 1 through the second backflow pipe 9, the nitrogen in the glass kettle continuously flows out through the air inlet pipe 3, the communicating pipe 1 and the air outlet pipe 8 until the pressure in the glass kettle is smaller than or equal to the pressure of the sealing liquid 2, the liquid level in the communicating pipe does not change any more, the constant-pressure maintaining device of the whole glass kettle tends to be stable, a certain nitrogen seal is formed in the first liquid collecting pipe 4 and the air inlet pipe 3, and the normal operation of the reaction in the glass kettle is ensured; furthermore, as a large amount of chlorine is consumed by chlorination reaction in the glass kettle, in order to ensure that nitrogen can be continuously introduced into the glass kettle in the pressure reaction process in the glass kettle, and the situation that the nitrogen cannot be switched in time occurs at the end of the reaction, a certain vacuum is generated in the glass kettle at the moment, the sealing liquid 2 in the communicating pipe 1 is sucked into the first liquid collecting sleeve, the air inlet pipe 3, the communicating pipe 1 and the air outlet pipe 8 are communicated again, in order to ensure the concentration of the nitrogen sucked from the air outlet, a nitrogen branch is connected to the second liquid collecting pipe 7 to continuously introduce the nitrogen into the second liquid collecting pipe 7, the nitrogen supplemented by the air outlet is sucked into the glass kettle to break the vacuum, in the process, the sealing liquid 2 in the first liquid collecting pipe 4 also flows back to the communicating pipe 1 through the first return pipe 5, the pressure in the glass kettle is continuously increased along with the introduction volume of the nitrogen, and the pressure in the glass kettle is recovered to be normal at a certain time point, at the moment, the sealing liquid 2 completely returns to the communicating pipe 1 and cuts off the communication between the air inlet pipe 3 and the air outlet pipe 8, and the constant-pressure protection device of the glass kettle automatically returns to the initial constant-pressure protection state. In addition, the first reflux valve 6 arranged on the first reflux pipe 5 and the second reflux valve 10 arranged on the second reflux pipe 9 can also reasonably control the time for the sealing liquid 2 to return to the communicating pipe 1, thereby ensuring the rapid circulation of nitrogen. So, operating personnel only need can realize the adaptation to glass cauldron internal pressure fast through the liquid column height of adjusting sealed liquid 2, and this structure can guarantee that the pressure in the glass cauldron is in normal level all the time simultaneously, avoids the glass cauldron to take place unexpected harm staff because of the superpressure, has promoted the stability of glass cauldron.
Of course, it should be noted that, the sealing liquid 2 in the communicating pipe 1 is inevitably deteriorated due to contact with the moisture in the glass kettle and the reaction material evaporated in a trace amount after long-term use, and therefore, in order to ensure the normal operation of the device, the sealing liquid 2 in the communicating pipe 1 needs to be replaced regularly, and therefore, in order to ensure the smooth discharge of the sealing liquid 2 in the communicating pipe 1, the bottom end of the communicating pipe 1 is provided with the liquid discharge valve 14, and each time of use, an operator can discharge the sealing liquid 2 in the communicating pipe 1 through the liquid discharge valve 14 and replace a new sealing liquid 2, so as to ensure the sealing effect.
Further, the rotten sealing liquid 2 of outflow can cause the promotion of cost if directly abandoning unavoidably, therefore, in order to handle rotten sealing liquid 2, the below of closed tube 1 is equipped with the catch basin 15 that is used for collecting sealing liquid 2 in the closed tube 1, be equipped with the baffling baffle that the polylith is parallel to each other in the catch basin 15, through the rotten sealing liquid 2 of bleeder valve 14 from closed tube 1 inflow catch basin 15 in, then through baffling baffle subside handle fall the impurity in the sealing liquid 2, handle the sealing liquid 2 of accomplishing and squeeze into closed tube 1 again through the liquid feeding subassembly at last and use, so can realize the reuse of 2 long periods of sealing liquid.
Furthermore, to the liquid feeding subassembly of this application, it includes liquid feeding pump 11 and feed liquor pipe 12, and in liquid collecting tank 15 was inserted to one end of liquid feeding pump 11, the other end of liquid feeding pump 11 then was linked together through feed liquor pipe 12 and closed tube 1, and the sealed liquid 2 that the processing was accomplished was through liquid feeding pump 11 through feed liquor pipe 12 in the closed tube 1 of constantly sending into to realize sealed liquid 2's reuse. Obviously, in order to control the filling speed and the filling flow rate of the filling pump 11, the liquid inlet pipe 12 is also provided with a liquid inlet valve 13. Specifically, in the embodiment of the present invention, the liquid feeding pump 11 is preferably a diaphragm pump, and the liquid feeding pipe 12 is directly connected to the second return pipe 9, so as to further optimize the arrangement of the pipeline, which is beneficial to reducing the production cost.
It should be noted that, as the reaction proceeds, the nitrogen gas in the glass kettle inevitably carries part of the sealing liquid 2 when flowing, and in order to prevent the sealing liquid 2 from flowing into the glass kettle or a subsequent processing device and bringing other processing risks, the top parts of the first liquid collecting pipe 4 and the second liquid collecting pipe 7 are further provided with a demister 16. The demister 16 can separate the nitrogen gas from the gas, and solves the problem of insufficient gas-liquid separation.
In addition, in some embodiments of this application, the communicating pipe 1 adopts polytetrafluoroethylene material to make, and the communicating pipe 1 that translucent polytetrafluoroethylene material made can show the sealed liquid 2 liquid level condition in the communicating pipe 1, and overpressure bursting and the process of vacuum suck-back also can obviously be seen through the liquid level change of sealed liquid 2, have very strong visual effect, and the operating personnel of being convenient for is to the control of device, and the result of use is outstanding.
In summary, the utility model provides a constant pressure maintaining device for a glass kettle, which comprises a U-shaped communicating pipe, wherein the communicating pipe is filled with sealing liquid, an air inlet pipe at the air inlet end of the communicating pipe, a first liquid collecting pipe and a first backflow pipe are communicated with an air inlet of the glass kettle, the air outlet end of the communicating pipe is communicated with a subsequent treatment device through an air outlet pipe, a second liquid collecting pipe and a second backflow pipe, the first backflow pipe is provided with a first backflow valve, the second backflow pipe is provided with a second backflow valve, the top of the second liquid collecting pipe is also provided with a nitrogen branch for introducing nitrogen into the second liquid collecting pipe, the bottom end of the communicating pipe is provided with a liquid discharge valve, a liquid collecting tank is arranged below the liquid discharge valve, and a liquid feeding pump is communicated with the communicating pipe through a liquid inlet pipe and is used for introducing the sealing liquid in the liquid collecting tank into the liquid inlet pipe. Compared with the prior art, this glass cauldron constant voltage holding device has solved the effect of sealed liquid and superpressure gas separation, backflow valve and back flow can effectively collect the sealed liquid that breaks the liquid seal, make it flow back to in the UNICOM's pipe, guarantee the used repeatedly of sealed liquid, the top of collecting tube sets up the defroster, solve the insufficient problem of gas-liquid separation, the risk that sealed liquid smugglies secretly and enters into aftertreatment device has been avoided, the glass cauldron superpressure problem except can being solved to the collecting tube of symmetrical arrangement, the problem of sealed liquid pollution product when also can prevent that the glass cauldron from taking place vacuum suck-back or gas outlet superpressure. The constant pressure maintaining device for the glass kettle is simple in structure and high in practicability.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The constant-pressure maintaining device for the glass kettle is characterized by comprising a communicating pipe arranged in a U shape, wherein the communicating pipe is filled with sealing liquid, the air inlet end of the communicating pipe is communicated with the air inlet of the glass kettle through an air inlet adjusting component, and the air outlet end of the communicating pipe is communicated with a subsequent processing device through an air outlet adjusting component;
the air inlet adjusting assembly comprises an air inlet pipe, a first liquid collecting pipe and a first return pipe, the first liquid collecting pipe is communicated with an air inlet of the glass kettle, the air inlet pipe and the first return pipe are used for communicating the first liquid collecting pipe and the communicating pipe, and a first return valve is arranged on the first return pipe;
the air outlet adjusting assembly comprises an air outlet pipe, a second liquid collecting pipe and a second return pipe, the second liquid collecting pipe is communicated with the subsequent treatment device, the air outlet pipe and the second return pipe are used for communicating the second liquid collecting pipe and the communicating pipe, and a second return valve is arranged on the second return pipe;
and a nitrogen branch is arranged at the top of the second liquid collecting pipe and used for introducing nitrogen into the second liquid collecting pipe.
2. The constant pressure maintaining device for glass kettles as claimed in claim 1, wherein a tapping valve is provided at the bottom end of the communicating pipe.
3. The glass kettle constant pressure maintaining device as claimed in claim 1, wherein a liquid collecting tank for collecting the sealing liquid in the communicating pipe is arranged below the communicating pipe.
4. The glass kettle constant pressure maintaining device as claimed in claim 3, wherein a baffle is provided in the liquid collecting tank.
5. The glass kettle constant pressure maintaining device according to claim 4, wherein said baffle plates are provided in plural number, and each of said baffle plates is arranged in parallel.
6. The constant pressure maintaining device for the glass kettle according to claim 3, comprising a liquid feeding assembly, wherein the liquid feeding assembly comprises a liquid feeding pump and a liquid feeding pipe, one end of the liquid feeding pump is inserted into the liquid collecting tank, and the other end of the liquid feeding pump is communicated with the communicating pipe through the liquid feeding pipe.
7. The constant pressure maintaining apparatus for glass tank as claimed in claim 6, wherein the liquid inlet pipe is provided with a liquid inlet valve.
8. The glass kettle constant pressure maintaining device according to claim 6, wherein the liquid feeding pump is a diaphragm pump.
9. The glass kettle constant pressure maintaining device as claimed in claim 1, wherein a demister is provided at the top of the second header pipe.
10. The glass kettle constant pressure maintaining device as claimed in claim 1, wherein the communicating pipe is made of polytetrafluoroethylene material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121883175.3U CN215842913U (en) | 2021-08-12 | 2021-08-12 | Constant pressure maintaining device for glass kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121883175.3U CN215842913U (en) | 2021-08-12 | 2021-08-12 | Constant pressure maintaining device for glass kettle |
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| Publication Number | Publication Date |
|---|---|
| CN215842913U true CN215842913U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121883175.3U Active CN215842913U (en) | 2021-08-12 | 2021-08-12 | Constant pressure maintaining device for glass kettle |
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| CN (1) | CN215842913U (en) |
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2021
- 2021-08-12 CN CN202121883175.3U patent/CN215842913U/en active Active
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