Automatic oil discharge device of cryogenic heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, in particular to an automatic oil discharge device of a cryogenic heat exchanger, which comprises an oil collecting tank connected with the heat exchanger, and the oil collecting tank is connected with a refrigerator; a first liquid level detector and a second liquid level detector are arranged on the oil collecting tank; after lubricating oil in the heat exchanger flows into the oil collecting tank, the oil quantity in the oil collecting tank is detected through the first liquid level detector and the second liquid level detector, it is ensured that the liquid level in the oil collecting tank is not reduced to zero, it is ensured that the liquid level in the oil collecting tank is not reduced to zero through detection of the liquid level, and the atmosphere and Freon are separated from each other through refrigerating machine oil. Therefore, the stability of the technological parameters of the Freon pipeline is ensured, and the normal work of the refrigerator is further ensured.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to an automatic oil draining device for cryogenic heat exchangers. Background Technology

[0002] During the operation of a heat exchanger, the working fluid (such as lubricating oil) may carry a certain amount of oil into the system. If this oil is not removed in time, it will accumulate in the system, negatively impacting the performance and efficiency of the heat exchanger.

[0003] The existing technical solution involves manually opening the drain valve when the oil level in the collection tank reaches a certain point, observing the discharge process through a level gauge, and manually closing the drain valve when the oil is almost completely drained. However, if human error prevents timely closure of the drain valve during the draining process, the Freon vapor phase pipeline will be connected to the atmosphere. This can lead to two problems: first, air entering the process system; second, the refrigeration unit's inlet pressure dropping to atmospheric pressure, causing the refrigeration unit to shut down under protection.

[0004] Therefore, this invention proposes an automatic oil draining device for cryogenic heat exchangers. Utility Model Content

[0005] In view of the problems existing in the above or prior art, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide an automatic oil draining device for cryogenic heat exchangers.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an automatic oil draining device for cryogenic heat exchangers, comprising,

[0008] An oil collection tank is connected to the heat exchanger, and the oil collection tank is connected to the refrigeration unit;

[0009] The oil collection tank is equipped with a first level detector and a second level detector;

[0010] After the lubricating oil in the heat exchanger flows into the oil collection tank, the oil level in the oil collection tank is detected by the first liquid level detector and the second liquid level detector to ensure that the liquid level in the oil collection tank does not drop to zero.

[0011] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, the oil collection tank is provided with a riser pipe and a guide pipe;

[0012] One end of the guide pipe is located below the oil level in the oil collecting tank.

[0013] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, it further includes an oil collection tank, on which a collection pipe is provided;

[0014] The collection pipe is connected to the oil collection tank.

[0015] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, it further includes a pneumatic shut-off valve disposed on the collecting pipe.

[0016] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, it further includes a pressure detector installed on the oil collection tank.

[0017] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, it further includes a PLC controller, a first data transmission module on the first liquid level detector and the second liquid level detector, and a second data transmission module on the pressure detector.

[0018] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, the heat exchanger is provided with a drain pipe and a recovery pipe;

[0019] The refrigeration unit is equipped with a connecting pipe.

[0020] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, a first control valve is provided on the drain pipe;

[0021] The recovery pipe is equipped with a second control valve.

[0022] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, a third control valve is provided on the riser pipe;

[0023] A fourth control valve is provided on the flow guide pipe;

[0024] The oil collection tank is equipped with a fifth control valve.

[0025] As a preferred embodiment of the automatic oil draining device for cryogenic heat exchangers of this utility model, the oil collection tank is provided with a lower wide section, a narrow section, and an upper wide section from bottom to top.

[0026] The beneficial effects of this automatic oil draining device for cryogenic heat exchangers are as follows: This device ensures that the oil level in the collection tank does not drop to zero by detecting the liquid level, thus isolating the atmosphere and Freon through the refrigeration oil. This guarantees the stability of the process parameters in the Freon pipeline, thereby ensuring the normal operation of the refrigeration unit. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the automatic oil draining device for a cryogenic heat exchanger.

[0029] Figure 2 This is a schematic diagram of the oil collection tank of the automatic oil draining device for a cryogenic heat exchanger.

[0030] In the diagram: 100, heat exchanger; 101, discharge pipe; 101a, first control valve; 102, recovery pipe; 102a, second control valve; 200, oil collection tank; 200a, lower wide section; 202b, narrow section; 202c, upper wide section; 201, first liquid level detector; 202, second liquid level detector; 203, pressure detector; 204, riser pipe; 204a, third control valve; 205, guide pipe; 205a, fourth control valve; 206, fifth control valve; 300, refrigeration unit; 301, connecting pipe; 400, oil collection tank; 401, collection pipe; 500, pneumatic shut-off valve; 600, PLC controller; 601, first data transmission module; 602, second data transmission module. Detailed Implementation

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0034] Example 1, referring to Figure 1 This is the first embodiment of the present invention, which provides an automatic oil draining device for a cryogenic heat exchanger, comprising:

[0035] An oil collection tank 200 is connected to the heat exchanger 100, and the oil collection tank 200 is connected to the refrigeration unit 300;

[0036] The oil collection tank 200 is equipped with a first liquid level detector 201 and a second liquid level detector 202;

[0037] After the lubricating oil in the heat exchanger 100 flows into the oil collection tank 200, the amount of oil in the oil collection tank 200 is detected by the first liquid level detector 201 and the second liquid level detector 202 to ensure that the liquid level in the oil collection tank 200 does not drop to zero.

[0038] Reference Figure 1 Heat exchanger 100 is Freon heat exchanger E0101, and oil collection tank 200 is used to automatically collect refrigeration oil in Freon heat exchanger E0101.

[0039] During use, the refrigeration oil in the heat exchanger 100 flows into the oil collection tank 200 under the action of gravity. The first liquid level detector 201 and the second liquid level detector 202 are used to detect the liquid level in the oil collection tank 200, so that the oil level collected in the oil collection tank 200 is always between the first liquid level detector 201 and the second liquid level detector 202. The Freon in the oil in the oil collection tank 200 returns to the refrigeration inlet after evaporation, thus completing the recovery of the oil. The setting of the first liquid level detector 201 and the second liquid level detector 202 makes it easy to detect the internal oil and control the amount of oil in the oil collection tank 200.

[0040] Specifically, the oil collection tank 200 is equipped with a riser pipe 204 and a guide pipe 205;

[0041] One end of the guide pipe 205 is located below the oil level in the oil collection tank 200.

[0042] Reference Figure 1 After the refrigeration oil enters the oil collection tank 200, one end of the guide pipe 205 is inserted below the oil surface. The residual refrigeration oil in the oil collection tank 200 can be used for liquid sealing, which can better separate the refrigeration oil and Freon. After the Freon evaporates, it is discharged from the oil collection tank 200 through the riser pipe 204.

[0043] Furthermore, it also includes an oil collection tank 400, which is equipped with a collection pipe 401;

[0044] The collection pipe 401 is connected to the oil collection tank 200.

[0045] Reference Figure 1 When there is too much cooling oil in the oil collection tank 200, exceeding the first liquid level detector 201, the oil in the oil collection tank 200 is discharged through the collection pipe 401 and collected in the oil collection bucket 400, so as to facilitate the control of the amount of oil in the oil collection tank 200.

[0046] The heat exchanger 100 is provided with a discharge pipe 101 and a recovery pipe 102;

[0047] The refrigeration unit 300 is equipped with a connecting pipe 301.

[0048] Reference Figure 1 It should be noted that the heat exchanger 100 is connected to the discharge pipe 101 and the guide pipe 205, the recovery pipe 102 is connected to the connecting pipe 301, and is eventually connected to the inlet of the chiller 300. The connecting pipe 301 is connected to the riser pipe 204.

[0049] Preferably, a first control valve 101a is provided on the discharge pipe 101;

[0050] The recovery pipe 102 is equipped with a second control valve 102a. The first control valve 101a can control the opening and closing of the discharge pipe 101, and the second control valve 102a can control the opening and closing of the recovery pipe 102.

[0051] It should be noted that a third control valve 204a is provided on the riser pipe 204;

[0052] A fourth control valve 205a is provided on the guide pipe 205;

[0053] The oil collection tank 200 is equipped with a fifth control valve 206. The third control valve 204a can control the opening and closing of the riser pipe 204, the fourth control valve 205a can control the opening and closing of the guide pipe 205, and the fifth control valve 206 can control whether the oil in the oil collection tank 200 is discharged.

[0054] Example 2, refer to Figure 1 This is the second embodiment of the present invention. Unlike the previous embodiment, it also includes a pneumatic shut-off valve 500 disposed on the collection pipe 401. The pneumatic shut-off valve 500 is an air-closed pneumatic shut-off valve.

[0055] Specifically, it also includes a pressure detector 203 installed on the oil collection tank 200, which is used to detect the pressure inside the oil collection tank 200.

[0056] The rest of the structure is the same as in Example 1.

[0057] Reference Figure 1The first level detector 201 detects the upper limit of the oil storage capacity in the oil collection tank 200, and the second level detector 202 detects the lower limit of the oil storage capacity in the oil collection tank 200. The pressure detector 203 is used to detect the pressure inside the oil collection tank 200. The oil in the heat exchanger 100 flows into the oil collection tank 200 by gravity. The residual oil in the oil collection tank 200 creates a liquid seal in the guide pipe 205. After the oil flows into the oil collection tank 200, if the pressure inside the oil collection tank 200 is too high, the oil in the oil collection tank 200 will be discharged through the fifth control valve 206, in conjunction with the second level detector. Device 202 ensures that the oil in the oil collection tank 200 is always above the lower limit of the oil level, preventing excessive oil discharge that could prevent the end of the guide pipe 205 from being liquid-sealed. Furthermore, when the pressure in the oil collection tank 200 is normal, but the oil level exceeds the upper limit set by the first level detector 201, the oil collection tank 200 will also discharge oil. Through dual control of level and pressure, it ensures that the pressure in the oil collection tank 200 does not drop to the inlet pressure protection value of the refrigeration unit 300, and that the oil level in the oil collection tank 200 does not drop to zero, thus isolating the atmosphere and Freon through the refrigeration oil. This ensures the stability of the Freon pipeline process parameters, thereby ensuring the normal operation of the refrigeration unit 300.

[0058] Example 3, referring to Figure 1 This is the third embodiment of the present invention. Unlike the previous embodiment, it also includes a PLC controller 600, a first data transmission module 601 on the first liquid level detector 201 and the second liquid level detector 202, and a second data transmission module 602 on the pressure detector 203.

[0059] Specifically, the PLC controller 600 is used to realize the automatic control of the pneumatic shut-off valve 500, the first data transmission module 601 is used to transmit the data detected by the first liquid level detector 201 and the second liquid level detector 202 to the PLC controller 600, and the second data transmission module 602 is used to transmit the data detected by the pressure detector 203 to the PLC controller 600.

[0060] The rest of the structure is the same as in Example 2.

[0061] During operation, the pneumatic shut-off valve 500 closes when the oil level and pressure in the oil collection tank 200 are within the set range. When the oil level in the oil collection tank 200 reaches the set value, the pneumatic shut-off valve 500 opens, initiating drainage. The pneumatic shut-off valve 500 closes when either the pressure or the oil level in the oil collection tank 200 drops to the set value. To ensure the shut-off valve remains closed in case of a malfunction, an airtight type shut-off valve is selected.

[0062] Example 4, refer to Figures 1-2This is the fourth embodiment of the present utility model. Unlike the previous embodiment, the oil collecting tank 200 is provided with a lower wide part 200a, a narrow part 200b, and an upper wide part 202c from bottom to top.

[0063] The rest of the structure is the same as in Example 3.

[0064] Reference Figure 2 The first liquid level detector 201 is located at the connection between the upper wide part 202c and the narrow part 200b, and the second liquid level detector 202 is located at the connection between the lower wide part 202a and the narrow part 200b. In use, since the oil collection tank 200 is wide at both the top and bottom and narrow in the middle, the rate of change of oil in the narrow part 200b will be more obvious, while the lower wide part 200a and the upper wide part 202c are wide, and the rate of change of oil in this part will be reduced. When draining oil, the oil draining speed can be avoided from being too fast, which may cause the pneumatic shut-off valve 500 to not be closed in time, thus improving the sensitivity of detection.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An automatic oil draining device for a cryogenic heat exchanger, characterized in that: include, An oil collection tank (200) is connected to the heat exchanger (100), and the oil collection tank (200) is connected to the refrigeration unit (300); The oil collection tank (200) is equipped with a first liquid level detector (201) and a second liquid level detector (202); After the lubricating oil in the heat exchanger (100) flows into the oil collection tank (200), the amount of oil in the oil collection tank (200) is detected by the first liquid level detector (201) and the second liquid level detector (202) to ensure that the liquid level in the oil collection tank (200) does not drop to zero.

2. The automatic oil draining device for cryogenic heat exchangers as described in claim 1, characterized in that: The oil collection tank (200) is equipped with a riser pipe (204) and a guide pipe (205); One end of the guide pipe (205) is located below the surface of the oil in the oil collection tank (200).

3. The automatic oil draining device for cryogenic heat exchangers as described in claim 1 or 2, characterized in that: It also includes an oil collection tank (400), on which a collection pipe (401) is provided; The collection pipe (401) is connected to the oil collection tank (200).

4. The automatic oil draining device for cryogenic heat exchangers as described in claim 3, characterized in that: It also includes a pneumatic shut-off valve (500) provided on the collection pipe (401).

5. The automatic oil draining device for cryogenic heat exchangers as described in claim 1, 2, or 4, characterized in that: It also includes a pressure detector (203) installed on the oil collection tank (200).

6. The automatic oil draining device for cryogenic heat exchangers as described in claim 5, characterized in that: It also includes a PLC controller (600), the first liquid level detector (201) and the second liquid level detector (202) are provided with a first data transmission module (601), and the pressure detector (203) is provided with a second data transmission module (602).

7. The automatic oil draining device for cryogenic heat exchangers as described in claim 1, 2, 4, or 6, characterized in that: The heat exchanger (100) is provided with a discharge pipe (101) and a recovery pipe (102); The refrigeration unit (300) is equipped with a connecting pipe (301).

8. The automatic oil draining device for cryogenic heat exchangers as described in claim 7, characterized in that: The discharge pipe (101) is equipped with a first control valve (101a); The recovery pipe (102) is equipped with a second control valve (102a).

9. The automatic oil draining device for cryogenic heat exchangers as described in claim 2, characterized in that: A third control valve (204a) is provided on the riser pipe (204); The guide pipe (205) is equipped with a fourth control valve (205a); The oil collection tank (200) is equipped with a fifth control valve (206).

10. The automatic oil draining device for cryogenic heat exchangers as described in claim 1, 2, 4, 6, 8, or 9, characterized in that: The oil collection tank (200) is provided with a lower wide section (200a), a narrow section (200b), and an upper wide section (202c) from bottom to top.

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