Valve assembly for air separation device

Abstract

The utility model provides a valve assembly used for an air separation device, the air separation device comprises a storage container, the valve assembly used for the air separation device comprises a connecting pipe, one end of the connecting pipe is communicated with an inlet of the storage container, the connecting pipe is provided with a first valve and a temperature difference control structure, and the first valve and the temperature difference control structure are arranged in the fluid flowing direction. And the temperature difference control structure is arranged on the downstream of the first valve, can monitor the temperature difference between the connecting pipe and the storage container, and can control connection and disconnection between the connecting pipe and the storage container according to the temperature difference between the connecting pipe and the storage container. According to the technical scheme, the problem that in the prior art, a valve on a communicating pipeline is not completely closed, so that air in the environment easily enters a container communicating with the communicating pipeline can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation devices, in particular to a valve component used in air separation devices. Background Art

[0002] The air separation unit is a device that uses the different boiling points of oxygen and nitrogen to perform deep cold separation of air. The raw material is air, and it can produce liquefied air, liquid oxygen, liquid nitrogen and other materials. Figure 1 As shown, during the production process, different containers 1, such as a distillation tower and a liquid oxygen storage tank or a distillation tower and a liquid nitrogen storage tank, are usually connected by a connecting pipe 2, and a third valve 3 and a fourth valve 4 are provided on the connecting pipe.

[0003] However, in the actual production process, the third valve 3 and the fourth valve 4 on the connecting pipeline 2 that should be closed may not be closed due to staff errors, or the third valve 3 and the fourth valve 4 on the connecting pipeline 2 may be damaged and cannot be completely closed. In this way, when the upstream equipment is in normal operation, the air in the environment will be pressurized so that the air in the environment flows into the connecting pipeline 2, or when the pipeline connected to the connecting pipeline 2 is purged, the purged gas will also enter the connecting pipeline 2, and then flow into the container 1 connected to the connecting pipeline 2. If the ambient air flowing into the container 1 is small, the purity of the liquefied gas in the container 1 will be reduced, resulting in product quality accidents. When the ambient air flowing into the container 1 is large, the liquefied gas in the container 1 will be rapidly gasified, resulting in the explosion of the connecting pipeline 2 or the container 1, causing a safety accident. Utility Model Content

[0004] The utility model provides a valve assembly for an air separation device, so as to solve the problem in the prior art that the valve on the connecting pipeline is not completely closed, so that the air in the environment can easily enter into the container connected with the connecting pipeline.

[0005] The utility model provides a valve component for an air separation device, the air separation device comprises a storage container, the valve component for the air separation device comprises: a connecting pipe, one end of the connecting pipe is connected with the inlet of the storage container, a first valve and a temperature difference control structure are arranged on the connecting pipe, along the fluid flow direction, the temperature difference control structure is arranged downstream of the first valve, the temperature difference control structure can monitor the temperature difference between the connecting pipe and the storage container, and the temperature difference control structure can control the connection and disconnection between the connecting pipe and the storage container according to the temperature difference between the connecting pipe and the storage container.

[0006] Furthermore, the temperature difference control structure includes: a temperature difference control valve, which is arranged on a connecting pipe and is arranged downstream of a first valve; a first temperature sensor, which is arranged between the temperature difference control valve and the first valve; a second temperature sensor, which is connected to a storage container; and a first controller, which is electrically connected to the temperature difference control valve, the first temperature sensor and the second temperature sensor, and the first controller can control the opening and closing of the temperature difference control valve through signals from the first temperature sensor and the second temperature sensor.

[0007] Furthermore, a pressure relief structure is provided on the connecting pipe, and the pressure relief structure is located upstream of the temperature difference control structure to discharge the gas in the connecting pipe.

[0008] Furthermore, the pressure relief structure includes a vent valve, which is arranged upstream of the first valve to discharge the gas in the connecting pipe.

[0009] Furthermore, the pressure relief structure also includes: a first pressure sensor, which is arranged between the temperature difference control valve and the first valve; a second pressure sensor, which is arranged downstream of the temperature difference control valve; a second controller, which is electrically connected to the first pressure sensor, the second pressure sensor, the temperature difference control valve and the vent valve, and the second controller can control the opening and closing of the vent valve through the signals of the first pressure sensor, the second pressure sensor and the state of the temperature difference control valve.

[0010] Furthermore, a second valve is provided on the connecting pipe, and the second valve is provided upstream of the vent valve.

[0011] Furthermore, the valve assembly for the air separation device also includes a control system, the second valve includes a valve body and a signal receiver, the control system is electrically connected to the signal receiver, and the control system can control the opening of the valve body through the signal receiver.

[0012] Furthermore, a pressure relief port is provided on the valve body, and the pressure relief port is communicated with the pressure relief pipeline.

[0013] Furthermore, the first controller is a PLC controller.

[0014] Furthermore, a filter is arranged in the connecting pipe, and the filter is arranged downstream of the temperature difference control valve.

[0015] By applying the technical solution of the utility model, one end of the connecting pipe is connected to the inlet of the storage container, and a first valve and a temperature difference control structure are provided on the connecting pipe. The temperature difference control structure controls the connection and disconnection between the connecting pipe and the storage container by monitoring the temperature difference between the connecting pipe and the storage container. When the first valve works normally, the first valve can control the connection and disconnection between the connecting pipe and the storage container. However, when the first valve is damaged and cannot be closed completely or the staff forgets to close it, the temperature difference control structure can detect the temperature difference between the connecting pipe and the storage container. When the temperature difference between the connecting pipe and the storage container exceeds the set value, the temperature difference control structure can disconnect the connection between the connecting pipe and the storage container, preventing air in the environment from entering the storage container, thereby preventing the purity of the liquefied gas in the storage container from being reduced and preventing the liquefied gas in the storage container from being rapidly gasified, thereby improving the reliability of the air separation unit and reducing the probability of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of a valve assembly for an air separation device in the prior art is shown;

[0018] Figure 2 The utility model shows a schematic structural diagram of a valve assembly for an air separation device.

[0019] The above drawings include the following reference numerals:

[0020] 10. Storage container;

[0021] 20. Connecting pipe; 21. First valve; 22. Second valve;

[0022] 31. Temperature difference control valve; 32. First controller;

[0023] 41. Vent valve; 42. Second controller;

[0024] 1. Container; 2. Connecting pipeline; 3. Third valve; 4. Fourth valve. DETAILED DESCRIPTION

[0025] 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] like Figure 2 As shown, an embodiment of the utility model provides a valve assembly for an air separation device, the air separation device includes a storage container 10, and the valve assembly for the air separation device includes a connecting pipe 20. One end of the connecting pipe 20 is connected to the inlet of the storage container 10, and a first valve 21 and a temperature difference control structure are arranged on the connecting pipe 20. Along the fluid flow direction, the temperature difference control structure is arranged downstream of the first valve 21. The temperature difference control structure can monitor the temperature difference between the connecting pipe 20 and the storage container 10, and the temperature difference control structure can control the connection and disconnection between the connecting pipe 20 and the storage container 10 according to the temperature difference between the connecting pipe 20 and the storage container 10. Among them, the air separation device also includes a supply structure, the other end of the connecting pipe 20 is connected to the supply structure, and the supply structure can provide liquefied gas to the storage container 10 through the connecting pipe 20. In the start-up and shutdown stage, if the valve is not closed, or the valve is not completely closed, it is very easy to cause air in the environment to flow into the storage container 10.

[0027] By applying the technical solution of the present application, one end of the connecting pipe 20 is connected to the inlet of the storage container 10, and the connecting pipe 20 is provided with a first valve 21 and a temperature difference control structure, and the temperature difference control structure controls the connection and disconnection of the connecting pipe 20 and the storage container 10 by monitoring the temperature difference between the connecting pipe 20 and the storage container 10. When the first valve 21 works normally, the first valve 21 can control the connection and disconnection of the connecting pipe 20 and the storage container 10, that is, the first valve 21 can control the connection and disconnection of the supply structure and the storage container 10. However, when the first valve 21 is damaged and cannot be completely closed or the staff forgets to close it, the temperature difference control structure can detect the temperature difference between the connecting pipe 20 and the storage container 10. When the temperature difference between the connecting pipe 20 and the storage container 10 exceeds the set value, the temperature difference control structure can disconnect the connection between the connecting pipe 20 and the storage container 10, that is, disconnect the connection between the supply structure and the storage container 10, thereby preventing air in the environment from entering the storage container 10, thereby preventing the purity of the liquefied gas in the storage container 10 from being reduced and preventing the liquefied gas in the storage container 10 from being rapidly vaporized, thereby improving the reliability of the air separation unit and reducing the probability of accidents.

[0028] The temperature difference control structure includes a temperature difference control valve 31, a first temperature sensor, a second temperature sensor and a first controller 32. The temperature difference control valve 31 is arranged on the connecting pipe 20, and the temperature difference control valve 31 is arranged downstream of the first valve 21. The first temperature sensor is arranged between the temperature difference control valve 31 and the first valve 21. The second temperature sensor is connected to the storage container 10. The first controller 32 is electrically connected to the temperature difference control valve 31, the first temperature sensor and the second temperature sensor, and the first controller 32 can control the opening and closing of the temperature difference control valve 31 through the signals of the first temperature sensor and the second temperature sensor. Such a setting is convenient for temperature monitoring of the connecting pipe 20 and the storage container 10, with a simple structure and convenient operation. At the same time, the first controller 32 can directly control the temperature difference control valve 31, thereby improving the degree of automation of the temperature difference control structure.

[0029] Furthermore, a pressure relief structure is provided on the connecting pipe 20, and the pressure relief structure is located upstream of the temperature difference control structure to discharge the gas in the connecting pipe 20. With such a configuration, the gas in the connecting pipe 20 can be discharged in time, and the gas in the connecting pipe 20 can be further prevented from entering the storage container 10. At the same time, when the liquefied gas in the storage container 10 is rapidly gasified, the pressure relief structure can discharge the gas in the connecting pipe 20, and the connecting pipe 20, the first valve 21 and the temperature difference control valve 31 can be prevented from being damaged due to excessive pressure, and further the connecting pipe 20 and the storage container 10 can be prevented from exploding.

[0030] Specifically, the pressure relief structure includes a vent valve 41, which is arranged upstream of the first valve 21 to discharge the gas in the connecting pipe 20. Such a configuration has a simple structure and is easy to assemble, while ensuring a pressure relief effect and facilitating the discharge of the gas in the connecting pipe 20.

[0031] The pressure relief structure further includes a first pressure sensor, a second pressure sensor and a second controller 42. The first pressure sensor is arranged between the temperature difference control valve 31 and the first valve 21. The second pressure sensor is arranged downstream of the temperature difference control valve 31. The second controller 42 is electrically connected to the first pressure sensor, the second pressure sensor, the temperature difference control valve 31 and the vent valve 41. The second controller 42 can control the opening and closing of the vent valve 41 through the signals of the first pressure sensor, the second pressure sensor and the state of the temperature difference control valve 31. In this way, when the pressure monitored by the first pressure sensor is greater than the pressure monitored by the second pressure sensor, and the temperature monitored by the first temperature sensor is higher than the temperature monitored by the second temperature sensor, it is judged that the fluid in the connecting pipe 20 is air. At this time, the second controller 42 controls the temperature difference control valve 31 to close and the vent valve 41 to open, thereby preventing the leakage of liquefied gas in the storage container 10 and discharging the air at the same time.

[0032] Specifically, the first valve 21 is a manual valve. When the air separation device operates normally, the first valve 21 is fully opened, and when the air separation device is shut down or the purity of the incoming material does not meet the standard, the first valve 21 is fully closed.

[0033] Furthermore, when the pressure monitored by the first pressure sensor is greater than the pressure monitored by the second pressure sensor, and the temperature monitored by the first temperature sensor is close to the temperature monitored by the second temperature sensor, it is judged that the production device is producing normally and the storage container 10 is filling with liquid normally. At this time, the temperature difference control valve 31 is opened and the vent valve 41 is closed to prevent leakage of liquefied gas.

[0034] Moreover, when the pressure monitored by the first pressure sensor is much lower than the pressure monitored by the second pressure sensor, it is judged that the liquefied gas in the storage container 10 is vaporized and the storage container 10 is under pressure. At this time, the second controller 42 controls the temperature difference control valve 31 and the vent valve 41 to open at the same time to relieve the pressure on the storage container 10.

[0035] Specifically, the connecting pipe 20 is provided with a second valve 22, and the second valve 22 is arranged upstream of the vent valve 41. Such an arrangement can further improve the reliability of the operation of the valve assembly.

[0036] Furthermore, the valve assembly for the air separation unit also includes a control system, the second valve 22 includes a valve body and a signal receiver, the control system is electrically connected to the signal receiver, and the control system can control the opening of the valve body through the signal receiver. In this way, the staff can control the opening of the valve body through the control system and the signal receiver according to the needs, further improving the automation of the valve assembly. Specifically, the control system can control the switch of the second valve 22 and the opening of the second valve 22 according to the purity and flow of the incoming material.

[0037] The valve body is provided with a pressure relief port, which is connected to the pressure relief pipeline. With such a configuration, when the purity of the incoming material does not meet the requirement, the pressure relief port is opened, and the liquefied gas that does not meet the standard can be discharged; or when the pressure in the pipeline upstream of the second valve 22 exceeds the standard, the pressure relief port can be opened to release the gas. Moreover, when the liquefied gas in the storage container 10 is gasified, the pressure relief port and the vent valve 41 are opened at the same time, thereby improving the pressure relief capacity of the air separation unit.

[0038] Specifically, the first controller 32 is a PLC controller, and the second controller 42 is also a PLC controller. Such a configuration can improve the working stability of the first controller 32 and the second controller 42, and can improve the response speed of the first controller 32 and the second controller 42, and timely control the temperature difference control valve 31 and the vent valve 41.

[0039] Furthermore, a filter is provided in the connecting pipe 20, and the filter is provided downstream of the temperature difference control valve 31. In this way, the filter can filter the liquefied gas, prevent impurities from entering the storage container 10, and further improve the purity of the liquefied gas in the storage container 10.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A valve assembly for an air separation unit, the air separation unit comprising a storage container (10), characterized in that: The valve assembly for an air separation unit comprises: A connecting pipe (20), one end of which is connected to the inlet of the storage container (10), and a first valve (21) and a temperature difference control structure are provided on the connecting pipe (20). Along the fluid flow direction, the temperature difference control structure is arranged downstream of the first valve (21), and the temperature difference control structure is capable of monitoring the temperature difference between the connecting pipe (20) and the storage container (10), and the temperature difference control structure is capable of controlling the connection and disconnection between the connecting pipe (20) and the storage container (10) according to the temperature difference between the connecting pipe (20) and the storage container (10).

2. The valve assembly for an air separation device according to claim 1, characterized in that: The temperature difference control structure comprises: a temperature difference control valve (31), the temperature difference control valve (31) being arranged on the connecting pipe (20), and the temperature difference control valve (31) being arranged downstream of the first valve (21); a first temperature sensor, arranged between the temperature difference control valve (31) and the first valve (21); a second temperature sensor, connected to the storage container (10); A first controller (32), wherein the first controller (32) is electrically connected to the temperature difference control valve (31), the first temperature sensor, and the second temperature sensor, and the first controller (32) is capable of controlling the opening and closing of the temperature difference control valve (31) through signals from the first temperature sensor and the second temperature sensor.

3. The valve assembly for an air separation device according to claim 2, characterized in that: The connecting pipe (20) is also provided with a pressure relief structure, which is located upstream of the temperature difference control structure to discharge the gas in the connecting pipe (20).

4. The valve assembly for an air separation device according to claim 3, characterized in that: The pressure relief structure comprises a vent valve (41), which is arranged upstream of the first valve (21) to discharge the gas in the connecting pipe (20).

5. The valve assembly for an air separation device according to claim 4, characterized in that: The pressure relief structure also includes: a first pressure sensor, arranged between the temperature difference control valve (31) and the first valve (21); a second pressure sensor, arranged downstream of the temperature difference control valve (31); A second controller (42), wherein the second controller (42) is electrically connected to the first pressure sensor, the second pressure sensor, the temperature difference control valve (31) and the vent valve (41), and the second controller (42) is capable of controlling the opening and closing of the vent valve (41) through signals from the first pressure sensor, the second pressure sensor and the state of the temperature difference control valve (31).

6. The valve assembly for an air separation unit according to claim 4, characterized in that: The connecting pipe (20) is provided with a second valve (22), and the second valve (22) is arranged upstream of the vent valve (41).

7. The valve assembly for an air separation unit according to claim 6, characterized in that: The valve assembly for the air separation device also includes a control system, the second valve (22) includes a valve body and a signal receiver, the control system is electrically connected to the signal receiver, and the control system can control the opening of the valve body through the signal receiver.

8. The valve assembly for an air separation device according to claim 7, characterized in that: The valve body is provided with a pressure relief port, and the pressure relief port is communicated with the pressure relief pipeline.

9. The valve assembly for an air separation device according to claim 3, characterized in that: The first controller (32) is a PLC controller.

10. The valve assembly for an air separation device according to claim 2, characterized in that: A filter is arranged in the connecting pipe (20), and the filter is arranged downstream of the temperature difference control valve (31).

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