Liquid oxygen mass metering device

Abstract

The utility model discloses a liquid oxygen mass metering device which comprises a connecting pipe, a low-temperature flow meter is arranged in the middle of the connecting pipe, a displayer is arranged at the upper end of the low-temperature flow meter, an isolation mechanism is arranged on the outer side surface of the low-temperature flow meter, and the isolation mechanism comprises an isolation cover, a fixing ring and a sealing gasket. Two isolation hoods are arranged on the outer side of the low-temperature flow meter, the two isolation hoods sleeve the outer side surface of the low-temperature flow meter in an up-down symmetrical state, and fixing rings are fixedly arranged on the two sides of the isolation hoods. The isolation structure is arranged on the outer side of the whole flow meter to isolate water vapor so as to prevent the frosting condition of the flow meter, the isolation structure of the device does not need to be in contact with a liquid oxygen medium, and most of the isolation structure is in approximate vacuum connection with a pipeline, so that most of temperature transfer can be prevented, and the safety of the device is improved. The isolation structure is not prone to frosting, and therefore the cleaning frequency of a traditional liquid oxygen low-temperature flowmeter can be remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metering devices, in particular to a liquid oxygen mass metering device. Background Art

[0002] Liquid oxygen mass metering device is a device used to measure the mass of liquid oxygen. In the production, storage and use of liquid oxygen, it is very important to accurately measure the mass of liquid oxygen, which helps to ensure safe and efficient operation.

[0003] When calculating the mass of liquid oxygen, weighing and cryogenic flowmeters are generally used to determine the delivery or usage of liquid argon. However, weighing cannot be used in all cases, because some equipment is large and weighing is inconvenient. At this time, a cryogenic flowmeter is needed. In the prior art, cryogenic flowmeters are generally provided with heat preservation and insulation structures to adapt to the ultra-low temperature of liquid oxygen. However, due to the low temperature, the flowmeter is still prone to frost in humid seasons. Once frosted, the flowmeter cannot be observed clearly and needs to be wiped frequently for each observation, which is very troublesome to use. Therefore, a liquid oxygen mass metering device is needed to improve this problem. Utility Model Content

[0004] The purpose of the utility model is to provide a liquid oxygen mass metering device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a liquid oxygen mass metering device, comprising a connecting pipe, a cryogenic flowmeter is arranged in the middle of the connecting pipe, a display is arranged at the upper end of the cryogenic flowmeter, an isolation mechanism is arranged on the outer surface of the cryogenic flowmeter, the isolation mechanism comprises an isolation cover, a fixing ring, and a sealing gasket, an isolation cover is arranged on the outer side of the cryogenic flowmeter, two isolation covers are arranged, and are symmetrically mounted on the outer surface of the cryogenic flowmeter in an upper and lower state, fixing rings are fixedly arranged on both sides of the isolation cover, and sealing gaskets are fixedly arranged on the outer surfaces of the isolation cover and the fixing ring.

[0006] Preferably, an isolation chamber is fixedly provided in the middle of the surface of the isolation cover at the upper end, and a visible glass window is fixedly provided on one side of the surface of the isolation chamber. The isolation chamber can be mounted on the outer surface of the display, and at this time, the visible glass window will not affect the user's observation of the specific values ​​of the display.

[0007] Preferably, an exhaust pipe is fixedly provided on one side of the surface of the isolation chamber, and a sealing ball is movably engaged inside the exhaust pipe. The exhaust pipe can cooperate with the pump body to evacuate the isolation cover and the interior of the isolation chamber into a nearly vacuum state, thereby preventing water vapor from contacting the display. If you are worried about the water vapor inside the remaining air forming frost, you can place a desiccant bag inside the isolation cover before fixing the isolation cover to absorb the only water vapor inside the isolation cover.

[0008] Preferably, a spring is fixedly provided on one side of the sealing ball inside the exhaust pipe, and the sealing ball can be pushed by the spring to move toward the isolation chamber, that is, the low-pressure side when the interior of the isolation cover is in a vacuum state; thereby ensuring that the exhaust pipe is in a sealed state when used, so as to maintain an approximately vacuum state inside the isolation chamber and the isolation cover; so as to prevent water vapor from contacting the outer surfaces of the display and the cryogenic flow meter.

[0009] Preferably, a connecting flange is provided between the connecting pipe and the cryogenic flow meter, and the connecting pipe and the cryogenic flow meter can be conveniently connected together through the connecting flange.

[0010] Preferably, locking screws are fixedly arranged between the fixing rings, and the isolation mechanism can be conveniently fixed by the locking screws, and the isolation mechanism can also be quickly disassembled at any time as needed.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The low-temperature flow meter and the display part of the device of the utility model are set up by an isolation cover and an isolation chamber isolation cover, and then the isolation cover and the isolation chamber can be evacuated to a nearly vacuum state through the exhaust pipe in cooperation with the pump body, so that water vapor can be prevented from contacting the display. If you are worried about the frost of the water vapor inside the remaining air, you can place a desiccant bag inside the isolation cover before fixing the isolation cover to absorb the only water vapor inside the isolation cover. In this way, the device is provided with an isolation structure on the outside of the entire flow meter to isolate water vapor and prevent the flow meter from frosting; thereby greatly reducing the frequency of defrosting.

[0013] 2. In the present invention, since the cryogenic flow meter needs to be connected to the connecting pipe, and liquid oxygen is generally in a high-pressure state when stored and flowing, the cryogenic flow meter generally has certain structural strength requirements, and is generally made of metal materials. Metal materials have better cooling effects. Although the isolation cover of the present device also has pressure resistance requirements, it is only an air pressure. Therefore, metal materials do not need to be used, and insulating materials can be used to reduce cooling. In addition, since the isolation chamber and the isolation cover of the present device are in a nearly vacuum state, not only can water vapor and the display be prevented from contacting, but also heat transfer can be significantly reduced, so that the temperature at the position of the visible glass window is closer to room temperature and is not easy to frost; thereby, the cleaning frequency of the traditional liquid oxygen cryogenic flow meter can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a liquid oxygen mass metering device of the utility model;

[0015] Figure 2 This is an exploded view of a liquid oxygen mass metering device of the utility model;

[0016] Figure 3 The utility model is a view of the internal structure of an exhaust pipe in a liquid oxygen mass metering device.

[0017] In the figure: 1. connecting pipe; 2. low temperature flow meter; 3. display; 4. isolation cover; 5. fixing ring; 6. sealing gasket; 7. isolation chamber; 8. visual glass window; 9. exhaust pipe; 10. sealing ball; 11. spring; 12. connecting flange; 13. locking screw. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-3The utility model provides a technical solution: a liquid oxygen mass metering device, including a connecting pipe 1, a cryogenic flowmeter 2 is arranged in the middle of the connecting pipe 1, a display 3 is arranged on the upper end of the cryogenic flowmeter 2, an isolation mechanism is arranged on the outer surface of the cryogenic flowmeter 2, the isolation mechanism includes an isolation cover 4, a fixing ring 5, and a sealing gasket 6, an isolation cover 4 is arranged on the outer side of the cryogenic flowmeter 2, two isolation covers 4 are arranged, and are symmetrically sleeved on the outer surface of the cryogenic flowmeter 2, fixing rings 5 ​​are fixedly arranged on both sides of the isolation cover 4, and sealing gaskets 6 are fixedly arranged on the outer surfaces of the isolation cover 4 and the fixing ring 5.

[0020] An isolation chamber 7 is fixedly arranged in the middle of the surface of the isolation cover 4 at the upper end, and a visual glass window 8 is fixedly arranged on one side of the surface of the isolation chamber 7. The isolation chamber 7 can be sleeved on the outer surface of the display 3, and at this time, the visual glass window 8 can not affect the user's observation of the specific value of the display 3;

[0021] A suction pipe 9 is fixedly arranged on one side of the surface of the isolation chamber 7, and a sealing ball 10 is movably engaged inside the suction pipe 9. The suction pipe 9 can cooperate with the pump body to evacuate the isolation cover 4 and the isolation chamber 7 into a nearly vacuum state, so that water vapor can be prevented from contacting the display 3. If you are worried about the frost of the water vapor inside the remaining air, you can place a desiccant bag inside the isolation cover 4 before fixing the isolation cover 4 to absorb the only water vapor inside the isolation cover 4;

[0022] A spring 11 is fixedly arranged on one side of the sealing ball 10 inside the exhaust pipe 9, and the sealing ball 10 can be pushed by the spring 11 to move toward the isolation chamber 7; that is, the low-pressure side when the isolation cover 4 is in a vacuum state; thereby ensuring that the exhaust pipe 9 is in a sealed state when used, so as to maintain a near-vacuum state inside the isolation chamber 7 and the isolation cover 4; so as to prevent water vapor from contacting the outer surfaces of the display 3 and the cryogenic flowmeter 2;

[0023] A connecting flange 12 is provided between the connecting pipe 1 and the cryogenic flow meter 2, and the connecting pipe 1 and the cryogenic flow meter 2 can be conveniently connected together through the connecting flange 12;

[0024] The fixing rings 5 ​​are fixedly provided with locking screws 13, and the isolating mechanism can be conveniently fixed by the locking screws 13, and the isolating mechanism can also be quickly disassembled at any time as needed.

[0025] Working principle: When using the device, the low-temperature flow meter 2 and the display 3 of the device are set up by the isolation cover 4 and the isolation chamber 7. Then, the isolation cover 4 and the isolation chamber 7 can be evacuated to a nearly vacuum state through the exhaust pipe 9 in cooperation with the pump body, so that water vapor can be prevented from contacting the display 3. If you are worried about the frost of the water vapor inside the remaining air, you can place a desiccant bag inside the isolation cover 4 before fixing the isolation cover 4 to absorb the only water vapor inside the isolation cover 4. In this way, the device is provided with an isolation structure on the outside of the entire flow meter to isolate water vapor and prevent the flow meter from frosting; thereby greatly reducing the frequency of defrosting;

[0026] At the same time, since the cryogenic flowmeter 2 needs to be connected to the connecting pipe 1, and liquid oxygen is generally in a high-pressure state when stored and flowing, the cryogenic flowmeter 2 generally has certain structural strength requirements, and is generally made of metal materials. Metal materials have better cooling effects. Although the isolation cover 4 of the present device also has pressure resistance requirements, it is only an air pressure. Therefore, metal materials do not need to be used, and insulating materials can be used to reduce cooling. In addition, since the isolation chamber 7 of the present device and the interior of the isolation cover 4 are in a nearly vacuum state, not only can water vapor and the display 3 be prevented from contacting, but also heat transfer can be significantly reduced, so that the temperature at the position of the visible glass window 8 is closer to room temperature and is not easy to frost; thereby, the cleaning frequency of the traditional liquid oxygen cryogenic flowmeter 2 can be further reduced.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid oxygen mass metering device, comprising a connecting pipe (1), characterized in that: A cryogenic flow meter (2) is arranged in the middle of the connecting pipe (1), a display (3) is arranged at the upper end of the cryogenic flow meter (2), an isolation mechanism is arranged on the outer surface of the cryogenic flow meter (2), and the isolation mechanism comprises an isolation cover (4), a fixing ring (5), and a sealing gasket (6). An isolation cover (4) is arranged on the outer side of the cryogenic flow meter (2), two isolation covers (4) are provided, and are sleeved on the outer surface of the cryogenic flow meter (2) in an upper and lower symmetrical state, fixing rings (5) are fixedly arranged on both sides of the isolation cover (4), and sealing gaskets (6) are fixedly arranged on the outer surfaces of the isolation cover (4) and the fixing ring (5).

2. A liquid oxygen mass metering device according to claim 1, characterized in that: An isolation chamber (7) is fixedly arranged in the middle of the surface of the isolation cover (4) at the upper end, and a visual glass window (8) is fixedly arranged on one side of the surface of the isolation chamber (7).

3. A liquid oxygen mass metering device according to claim 2, characterized in that: An air extraction pipe (9) is fixedly arranged on one side of the surface of the isolation chamber (7), and a sealing ball (10) is movably engaged inside the air extraction pipe (9).

4. A liquid oxygen mass metering device according to claim 3, characterized in that: A spring (11) is fixedly arranged inside the exhaust pipe (9) on one side of the sealing ball (10).

5. A liquid oxygen mass metering device according to claim 1, characterized in that: A connecting flange (12) is provided between the connecting pipe (1) and the cryogenic flow meter (2).

6. A liquid oxygen mass metering device according to claim 1, characterized in that: Locking screws (13) are fixedly arranged between the fixing rings (5).

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