A three-stage oil and gas recovery device

Abstract

This utility model discloses a tertiary oil and gas recovery device, belonging to the field of oil and gas recovery technology. The tertiary oil and gas recovery device includes an adsorption tank group, a vacuum pump, a condenser, and an venting pipe group. An oil inlet pipe group connects the adsorption tank group to the underground oil tank, and a connecting pipe group connects the adsorption tank group to the condenser. Both the oil inlet pipe group and the connecting pipe group are equipped with a switching mechanism to disconnect the connection between the oil inlet pipe group, the connecting pipe group, and one of the adsorption tanks in the adsorption tank group. A return oil pipe connects the condenser to the underground oil tank. This utility model allows the other two adsorption tanks to continue normal adsorption operations while one adsorption tank is under maintenance. Therefore, it eliminates the need to shut down the entire recovery device when one adsorption tank is under maintenance, ensuring continuous and normal processing. Simultaneously, corresponding operational adjustments are faster and more precise.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas recovery technology, and in particular to a tertiary oil and gas recovery device. Background Technology

[0002] As important oil storage and sales sites, gas stations experience oil vapor evaporation and loss during unloading and refueling. The emission of these oil vapors not only pollutes the environment and wastes petroleum resources, but also endangers human health, poses safety hazards, and threatens the safe operation of gas stations. Therefore, it is necessary to monitor and recover oil vapors at gas stations.

[0003] Currently, most gas stations utilize tertiary vapor recovery systems to reduce the concentration of air pollutants, making them more environmentally friendly. For example, the tertiary vapor recovery device disclosed in the prior art publication document "CN213866072U" has low operating costs and good recovery effect. However, when maintenance is required on a particular adsorption tank in the recovery device, the entire adsorption device must be shut down. Therefore, maintenance on a single adsorption tank will cause the entire vapor recovery operation to be suspended, which will inevitably have a certain impact on normal vapor treatment operations. Utility Model Content

[0004] The purpose of this invention is to solve the problem in the prior art where the maintenance of a certain adsorption tank requires the suspension of the entire oil and gas recovery operation, and to propose a three-stage oil and gas recovery device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A tertiary oil and gas recovery device includes an adsorption tank group, a vacuum pump, a condenser, and an exhaust pipe group. An oil inlet pipe group is connected to the underground oil tank, and a connecting pipe group is connected to the condenser. Both the oil inlet pipe group and the connecting pipe group are equipped with a switching mechanism to cut off the connection between the oil inlet pipe group and the connecting pipe group and one of the adsorption tanks in the adsorption tank group. The vacuum pump is located on the connecting pipe group, and the exhaust pipe group is connected to the connecting pipe group and located between the adsorption tank group and the vacuum pump. A return pipe is connected between the condenser and the underground oil tank.

[0007] In some embodiments, the adsorption tank group includes a first adsorption tank, a second adsorption tank, and a third adsorption tank, wherein the first adsorption tank, the second adsorption tank, and the third adsorption tank are connected in parallel.

[0008] In some embodiments, the oil inlet pipe assembly includes a main oil inlet pipe, a first oil inlet branch pipe, a second oil inlet branch pipe, and a third oil inlet branch pipe. The main oil inlet pipe is connected between the switching mechanism and the underground oil tank, and a first solenoid valve is provided on the main oil inlet pipe. One end of the first oil inlet branch pipe, the second oil inlet branch pipe, and the third oil inlet branch pipe are respectively connected to one of the switching mechanisms, and the other end is respectively connected to the first adsorption tank, the second adsorption tank, and the third adsorption tank.

[0009] In some embodiments, the connecting pipe group includes a main connecting pipe, a first connecting branch pipe, a second connecting branch pipe, and a third connecting branch pipe. The main connecting pipe is connected between the switching mechanism and the condenser, and a vacuum pump is installed on the main connecting pipe. One end of the first connecting branch pipe, the second connecting branch pipe, and the third connecting branch pipe are respectively connected to another switching mechanism, and the other end are respectively connected to the first adsorption tank, the second adsorption tank, and the third adsorption tank.

[0010] In some embodiments, the switching mechanism includes a sleeve, an adjusting tube, and a flexible tube. The adjusting tube is slidably disposed inside the sleeve, one end of the flexible tube is connected to the adjusting tube, the adjusting tube has two through holes, and an adjusting assembly is provided between the adjusting tube and the sleeve. The sleeve has two connecting tubes, the inner diameter of the connecting tubes is larger than the inner diameter of the sleeve, and sliding sealing rings are provided on both sides of the two connecting tubes between the sleeve and the adjusting tube.

[0011] In some embodiments, the ends of the hoses on the two switching mechanisms that are away from the regulating pipe are respectively connected to the main oil inlet pipe and the main connecting pipe, the sleeves on the two switching mechanisms are respectively connected to one end of the second oil inlet branch pipe and the second connecting branch pipe, the two connecting pipes on one switching mechanism are respectively connected to one end of the first oil inlet branch pipe and the third oil inlet branch pipe, and the two connecting pipes on the other switching mechanism are respectively connected to the first connecting branch pipe and the third connecting branch pipe.

[0012] In some embodiments, the adjusting assembly includes a threaded shaft and a nut, the threaded shaft being disposed on the adjusting tube and the nut being disposed on the sleeve, and the threaded shaft and the nut being threadedly engaged.

[0013] In some embodiments, the regulating tube is provided with three indicator marks along its length, and the distance between two adjacent indicator marks is equal to half the center-to-center distance between two through holes on the regulating tube.

[0014] In some embodiments, the venting pipe assembly includes a venting pipe, a second solenoid valve, and a concentration sensor. One end of the venting pipe is connected to the main connecting pipe, and the other end is the venting port. The second solenoid valve and the concentration sensor are respectively disposed on the venting pipe.

[0015] In some embodiments, a manual return valve is provided on the return oil pipe.

[0016] Compared with the prior art, the present invention provides a three-stage oil and gas recovery device, which has the following beneficial effects.

[0017] 1. This utility model, through the cooperation of the adsorption tank group and the switching mechanism, allows the switching mechanism to close one adsorption tank when maintenance is required, while simultaneously opening another standby adsorption tank. This ensures that two adsorption tanks are in operation during the recovery process. Thus, while ensuring the normal adsorption treatment of the adsorption tank group, maintenance can also be performed on the adsorption tank that needs to be repaired. This eliminates the need to shut down the entire recovery device when one adsorption tank is being repaired, avoiding any impact on normal oil and gas treatment operations and ensuring the normal and continuous operation of the treatment process.

[0018] 2. This utility model, through the coordination of the adjustment components and the indicator marks, makes the switching work during maintenance more convenient, quick and easy to operate, which helps to improve the efficiency of maintenance work, and makes the switching work faster and more accurate, ensuring the accuracy of the switching work, thereby ensuring the normal operation of the device, and also making the switching mechanism easier to use.

[0019] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the adsorption tank assembly.

[0022] Figure 3 This is a cross-sectional view of the switching mechanism on the oil inlet pipe assembly.

[0023] Figure 4 This is a cross-sectional view of the switching mechanism on the connecting pipe assembly.

[0024] Figure 5 This is a partial three-dimensional structural diagram of the regulating tube in the switching mechanism.

[0025] In the picture:

[0026] 1. Adsorption Tank Assembly; 101. First Adsorption Tank; 102. Second Adsorption Tank; 103. Third Adsorption Tank; 2. Oil Inlet Pipe Assembly; 201. Main Oil Inlet Pipe; 202. First Oil Inlet Branch Pipe; 203. Second Oil Inlet Branch Pipe; 204. Third Oil Inlet Branch Pipe; 205. First Solenoid Valve; 3. Connecting Pipe Assembly; 301. Main Connecting Pipe; 302. First Connecting Branch Pipe; 303. Second Connecting Branch Pipe; 304. Third Connecting Branch Pipe; 4. Vacuum pump; 5. Condenser; 6. Drain pipe assembly; 601. Drain pipe; 602. Second solenoid valve; 603. Concentration sensor; 7. Switching mechanism; 701. Sleeve; 702. Connecting pipe; 703. Adjusting pipe; 704. Through hole; 705. Hose; 706. Sliding seal ring; 707. Threaded shaft; 708. Nut; 8. Return oil pipe; 9. Underground oil tank; 10. Manual return oil valve; 11. Indicator mark. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figure 1 A tertiary oil and gas recovery device includes an adsorption tank group 1, a vacuum pump 4, a condenser 5, and an exhaust pipe group 6. An oil inlet pipe group 2 is connected between the adsorption tank group 1 and the underground oil tank 9. A connecting pipe group 3 is connected between the adsorption tank group 1 and the condenser 5. A switching mechanism 7 is provided on both the oil inlet pipe group 2 and the connecting pipe group 3. The switching mechanism 7 is used to cut off the connection between the oil inlet pipe group 2 and the connecting pipe group 3 and one of the adsorption tanks in the adsorption tank group 1. The vacuum pump 4 is located on the connecting pipe group 3. The exhaust pipe group 6 is connected to the connecting pipe group 3 and is located between the adsorption tank group 1 and the vacuum pump 4. An oil return pipe 8 is connected between the condenser 5 and the underground oil tank 9. An oil return manual valve 10 is provided on the oil return pipe 8 to control the opening and closing of the oil return pipe 8 and the underground oil tank 9.

[0029] Reference Figure 2 The adsorption tank group 1 includes a first adsorption tank 101, a second adsorption tank 102 and a third adsorption tank 103, which are connected in parallel.

[0030] Reference Figure 2 and Figure 3The oil inlet pipe group 2 includes a main oil inlet pipe 201, a first oil inlet branch pipe 202, a second oil inlet branch pipe 203 and a third oil inlet branch pipe 204. The main oil inlet pipe 201 is connected between the switching mechanism 7 and the underground oil tank 9, and a first solenoid valve 205 is provided on the main oil inlet pipe 201. One end of the first oil inlet branch pipe 202, the second oil inlet branch pipe 203 and the third oil inlet branch pipe 204 are respectively connected to one of the switching mechanisms 7, and the other end is respectively connected to the first adsorption tank 101, the second adsorption tank 102 and the third adsorption tank 103.

[0031] Reference Figure 2 and Figure 4 The connecting pipe assembly 3 includes a main connecting pipe 301, a first connecting branch pipe 302, a second connecting branch pipe 303, and a third connecting branch pipe 304. The main connecting pipe 301 is connected between the switching mechanism 7 and the condenser 5, and the vacuum pump 4 is mounted on the main connecting pipe 301. One end of the first connecting branch pipe 302, the second connecting branch pipe 303, and the third connecting branch pipe 304 are respectively connected to another switching mechanism 7, and the other end is respectively connected to the first adsorption tank 101, the second adsorption tank 102, and the third adsorption tank 103.

[0032] Under normal circumstances, the first adsorption tank 101, the second adsorption tank 102, and the third adsorption tank 103 all have normal adsorption functions. Moreover, under the action of the switching mechanism 7, one of the adsorption tanks in the adsorption tank group 1 can be closed. Therefore, during adsorption work, two adsorption tanks in the adsorption tank group 1 perform normal adsorption of the oil flowing through the oil and gas, while the other one is closed and kept in reserve. When it is necessary to repair one of the two normally adsorbing adsorption tanks, the adsorption tank can be closed through the switching mechanism 7, and the reserve adsorption tank will be opened at the same time. At this time, there are still two adsorption tanks that can perform normal adsorption. Therefore, it can be ensured that the adsorption tank group 1 can perform normal adsorption treatment work, and at the same time, the adsorption tank that needs to be repaired can be repaired. This means that when repairing one adsorption tank, it is not necessary to shut down the entire recovery device, thereby avoiding any impact on normal oil and gas treatment work.

[0033] Reference Figure 3 and Figure 4 The switching mechanism 7 includes a sleeve 701, an adjusting tube 703, and a flexible tube 705. The adjusting tube 703 is slidably disposed inside the sleeve 701. One end of the flexible tube 705 is connected to the adjusting tube 703. The adjusting tube 703 has two through holes 704. An adjusting component is provided between the adjusting tube 703 and the sleeve 701. The sleeve 701 has two connecting tubes 702. The inner diameter of the connecting tubes 702 is larger than the inner diameter of the sleeve 701. Sliding sealing rings 706 are provided on both sides of the two connecting tubes 702 between the sleeve 701 and the adjusting tube 703 to ensure effective sealing between the sleeve 701 and the adjusting tube 703.

[0034] The ends of the hoses 705 on the two switching mechanisms 7 that are away from the regulating pipe 703 are respectively connected to the main oil inlet pipe 201 and the main connecting pipe 301. The sleeves 701 on the two switching mechanisms 7 are respectively connected to one end of the second oil inlet branch pipe 203 and the second connecting branch pipe 303. The two connecting pipes 702 on one of the switching mechanisms 7 are respectively connected to one end of the first oil inlet branch pipe 202 and the third oil inlet branch pipe 204. The two connecting pipes 702 on the other switching mechanism 7 are respectively connected to the first connecting branch pipe 302 and the third connecting branch pipe 304.

[0035] The adjusting assembly includes a threaded shaft 707 and a nut 708. The threaded shaft 707 is mounted on the adjusting tube 703, and the nut 708 is mounted on the sleeve 701. The threaded shaft 707 and the nut 708 are threadedly engaged.

[0036] In the initial state, the positions of the corresponding components in the two switching mechanisms 7 are as follows: Figure 3 and Figure 4 As shown, at this time, the oil and gas in the buried oil tank 9 can sequentially pass through the main oil inlet pipe 201, the hose 705, and the regulating pipe 703, and finally be diverted through the two through holes 704 to the second oil inlet branch pipe 203 and the connecting pipe 702 corresponding to the third oil inlet branch pipe 204. The oil and gas entering the connecting pipe 702 can then directly enter the third oil inlet branch pipe 204. Then, the oil and gas entering the third oil inlet branch pipe 204 and the second oil inlet branch pipe 203 can respectively enter the third adsorption tank 103 and the second adsorption tank 102. At this time, the third adsorption tank 103 and the second adsorption tank... 102 can adsorb the oil in the oil and gas, while the remaining gas will continue to enter the third connecting branch pipe 304 and the second connecting branch pipe 303. The gas entering the third connecting branch pipe 304 will sequentially enter another regulating pipe 703 through the connecting pipe 702 and the corresponding through hole 704. The gas entering the second connecting branch pipe 303 can directly enter the regulating pipe 703 through the corresponding through hole 704, and then converge into the main connecting pipe 301 through the hose 705 connected to the regulating pipe 703, and finally enter the vent pipe group 6.

[0037] As can be seen from the above, the second adsorption tank 102 and the third adsorption tank 103 in the adsorption tank group 1 are in normal working condition, while the first adsorption tank 101 is in idle standby condition. When the second adsorption tank 102 needs to be repaired, by turning the threaded shaft 707 in the switching mechanism 7 on the oil inlet pipe group 2, the corresponding regulating pipe 703 can be driven to slide a certain distance on the sleeve 701 under the action of the nut 708, thereby changing the position of the two through holes 704 on the regulating pipe 703. Through this adjustment method, one of the through holes 704 on the regulating pipe 703 can still slide within the connecting pipe 702 connected to the third oil inlet pipe 204. Therefore, the regulating pipe 703 is still connected to the third oil inlet pipe 204 and the third adsorption tank 103 through the through hole 704, while the other through hole 704 will separate from the second oil inlet pipe 203 and enter the connecting pipe 702 corresponding to the first oil inlet pipe 202. At this time, the regulating pipe 703 is connected to the first adsorption tank 101 through the through hole 704 and the first oil inlet pipe 202. The second oil inlet pipe 203 is in a closed state with the second oil inlet pipe 203 under the cooperation of the sliding sealing rings 706 on both sides and the sleeve 701 and the regulating pipe 703, so as to achieve the purpose of cutting off the connection between the second adsorption tank 102 and the oil inlet pipe group 2.

[0038] Then, by turning the threaded shaft 707 in the switching mechanism 7 on the connecting pipe assembly 3, the corresponding adjusting pipe 703 can be moved to slide a certain distance on the sleeve 701, causing the positions of the two through holes 704 on the adjusting pipe 703 to change. During this process, one of the through holes 704 on the adjusting pipe 703 can still slide within the connecting pipe 702 that is connected to the third connecting branch pipe 304. Therefore, the adjusting pipe 703 is still connected to the third connecting branch pipe 304 and the third adsorption tank 103 through the through hole 704. Another through hole 704 will separate from the second oil inlet branch pipe 203 and enter the connecting pipe 702 corresponding to the first connecting branch pipe 302. At this time, the regulating pipe 703 is connected to the first adsorption tank 101 through the through hole 704 and the first connecting branch pipe 302. The second connecting branch pipe 303 is in a closed state with the second oil inlet branch pipe 203 under the cooperation of the sliding sealing rings 706 on both sides and the sleeve 701 and the regulating pipe 703, so as to achieve the purpose of cutting off the connection between the second adsorption tank 102 and the connecting pipe group 3.

[0039] The second adsorption tank 102 can be closed by the above operation, cutting off the connection between the second adsorption tank 102 and the oil inlet pipe group 2 and the connecting pipe group 3 respectively. At the same time, the first adsorption tank 101 can be connected to the oil inlet pipe group 2 and the connecting pipe group 3 respectively. At this time, the second adsorption tank 102 can be repaired, while the first adsorption tank 101 and the third adsorption tank 103 cooperate to carry out normal oil and gas adsorption work.

[0040] When the third adsorption tank 103 needs to be repaired, the threaded shaft 707 in the switching mechanism 7 on the oil inlet pipe group 2 can be turned and the corresponding adjusting pipe 703 can be slid a certain distance. This allows one of the through holes 704 to be connected to the second oil inlet branch pipe 203, while the other through hole 704 remains in the connecting pipe 702 connected to the first oil inlet branch pipe 202. This allows the through hole 704 to be connected to the first oil inlet branch pipe 202 through the connecting pipe 702. At the same time, with the cooperation of the sleeve 701, the adjusting pipe 703 and the sliding sealing ring 706, the connection between the adjusting pipe 703 and the third oil inlet branch pipe 204 and the connecting pipe 702 is cut off, thereby achieving the purpose of cutting off the connection between the third adsorption tank 103 and the oil inlet pipe group 2.

[0041] Then, continue to turn the threaded shaft 707 in the switching mechanism 7 on the connecting pipe group 3, and make the corresponding adjusting pipe 703 continue to slide a certain distance, so that one of the through holes 704 is connected to the second connecting branch pipe 303, while the other through hole 704 is still located in the connecting pipe 702 connected to the first connecting branch pipe 302, so that the through hole 704 is connected to the first connecting branch pipe 302 through the connecting pipe 702. At the same time, under the cooperation of the sleeve 701, the adjusting pipe 703 and the sliding sealing ring 706, the adjusting pipe 703 is cut off from the third connecting branch pipe 304 and the connecting pipe 702, thereby achieving the purpose of cutting off the connection between the third adsorption tank 103 and the connecting pipe group 3.

[0042] The above operations can be used to close the third adsorption tank 103, cut off the connection between the third adsorption tank 103 and the oil inlet pipe group 2 and the connecting pipe group 3 respectively, and at the same time connect the second adsorption tank 102 to the oil inlet pipe group 2 and the connecting pipe group 3 respectively. At this time, the third adsorption tank 103 can be repaired, while the first adsorption tank 101 and the second adsorption tank 102 cooperate to carry out normal oil and gas adsorption work.

[0043] In summary, the switching mechanism 7 can close any one of the first adsorption tank 101, the second adsorption tank 102, and the third adsorption tank 103, while opening the other two. Moreover, switching only requires turning the threaded shaft 707, which makes the switching work during maintenance more convenient, quick, and easy to operate, thus helping to improve the efficiency of maintenance work.

[0044] Reference Figure 5 The regulating tube 703 has three indicator marks 11 along its length, and the distance between two adjacent indicator marks 11 is equal to half the center distance between the two through holes 704 on the regulating tube 703.

[0045] When adjusting the switching mechanism 7, the position of the two through holes 704 can be determined by observing whether the position of a certain indicator mark 11 corresponds to the end of the sleeve 701. This allows the two through holes 704 to connect more accurately with the first oil inlet pipe 202, the second oil inlet pipe 203, and the third oil inlet pipe 204 (or the first connecting pipe 302, the second connecting pipe 303, and the third connecting pipe 304). This makes the switching operation faster and more accurate, thus ensuring the normal operation of the device.

[0046] Reference Figure 1 The venting pipe assembly 6 includes a venting pipe 601, a second solenoid valve 602, and a concentration sensor 603. One end of the venting pipe 601 is connected to the main connecting pipe 301, and the other end is the venting port. The second solenoid valve 602 and the concentration sensor 603 are respectively installed on the venting pipe 601. After the gas adsorbed by the adsorption tank assembly 1 enters the main connecting pipe 301, it will enter the venting pipe 601 and be discharged. During this process, the concentration sensor 603 can monitor the oil and gas concentration of the discharged gas.

[0047] In this invention, when oil and gas adsorption is performed, the first solenoid valve 205 is opened, and the oil and gas generated in the underground oil tank 9 can enter two of the adsorption tanks in the adsorption tank group 1 through the oil inlet pipe group 2. During this process, the adsorption material in the two adsorption tanks will adsorb the oil in the oil and gas, and the remaining gas will be discharged to the vent pipe group 6 through the connecting pipe group 3.

[0048] When the two adsorption tanks are saturated after a certain period of adsorption, the first solenoid valve 205 and the concentration sensor 603 are closed, and the vacuum pump 4 is started. At this time, the vacuum pump 4 can evacuate the two adsorption tanks through the connecting pipe group 3, and thus draw out the oil and high-concentration oil gas in the adsorption material in the two adsorption tanks to the condenser 5. Under the action of the condenser 5, the high-concentration oil gas is condensed into oil and flows back to the underground oil tank 9 along with the drawn-out oil.

[0049] When a particular adsorption tank needs to be repaired, the switching mechanism 7 can be used to close the adsorption tank and open another spare adsorption tank at the same time, ensuring that two adsorption tanks are working during the recycling process. At the same time, the adsorption tank that needs to be repaired can be repaired, so that the entire recycling device does not need to be shut down when one of the adsorption tanks is being repaired.

[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A device for recovering oil and gas, comprising an adsorption tank group (1), a vacuum pump (4), a condenser (5) and a venting pipe group (6), characterized in that, An oil inlet pipe group (2) is connected between the adsorption tank group (1) and the underground oil tank (9). A connecting pipe group (3) is connected between the adsorption tank group (1) and the condenser (5). A switching mechanism (7) is provided on both the oil inlet pipe group (2) and the connecting pipe group (3). The switching mechanism (7) is used to cut off the connection between the oil inlet pipe group (2) and the connecting pipe group (3) and one of the adsorption tanks in the adsorption tank group (1). The vacuum pump (4) is located on the connecting pipe group (3). The venting pipe group (6) is connected to the connecting pipe group (3) and located between the adsorption tank group (1) and the vacuum pump (4). A return pipe (8) is connected between the condenser (5) and the underground oil tank (9).

2. The tertiary oil and gas recovery device according to claim 1, characterized in that, The adsorption tank group (1) includes a first adsorption tank (101), a second adsorption tank (102) and a third adsorption tank (103), which are connected in parallel.

3. The tertiary oil and gas recovery device according to claim 2, characterized in that, The oil inlet pipe group (2) includes a main oil inlet pipe (201), a first oil inlet branch pipe (202), a second oil inlet branch pipe (203) and a third oil inlet branch pipe (204). The main oil inlet pipe (201) is connected between the switching mechanism (7) and the underground oil tank (9), and a first solenoid valve (205) is provided on the main oil inlet pipe (201). One end of the first oil inlet branch pipe (202), the second oil inlet branch pipe (203) and the third oil inlet branch pipe (204) are respectively connected to one of the switching mechanisms (7), and the other end is respectively connected to the first adsorption tank (101), the second adsorption tank (102) and the third adsorption tank (103).

4. A tertiary oil and gas recovery device according to claim 3, characterized in that, The connecting pipe group (3) includes a main connecting pipe (301), a first connecting branch pipe (302), a second connecting branch pipe (303) and a third connecting branch pipe (304). The main connecting pipe (301) is connected between the switching mechanism (7) and the condenser (5), and the vacuum pump (4) is installed on the main connecting pipe (301). One end of the first connecting branch pipe (302), the second connecting branch pipe (303) and the third connecting branch pipe (304) are respectively connected to another switching mechanism (7), and the other end is respectively connected to the first adsorption tank (101), the second adsorption tank (102) and the third adsorption tank (103).

5. A tertiary oil and gas recovery device according to claim 4, characterized in that, The switching mechanism (7) includes a sleeve (701), an adjusting tube (703), and a flexible tube (705). The adjusting tube (703) is slidably disposed inside the sleeve (701). One end of the flexible tube (705) is connected to the adjusting tube (703). The adjusting tube (703) has two through holes (704). An adjusting component is provided between the adjusting tube (703) and the sleeve (701). The sleeve (701) has two connecting tubes (702). The inner diameter of the connecting tube (702) is larger than the inner diameter of the sleeve (701). Sliding sealing rings (706) are provided on both sides of the two connecting tubes (702) between the sleeve (701) and the adjusting tube (703).

6. A tertiary oil and gas recovery device according to claim 5, characterized in that, The ends of the hoses (705) on the two switching mechanisms (7) away from the regulating pipe (703) are connected to the main oil inlet pipe (201) and the main connecting pipe (301) respectively. The sleeves (701) on the two switching mechanisms (7) are connected to the ends of the second oil inlet branch pipe (203) and the second connecting branch pipe (303) respectively. The two connecting pipes (702) on one of the switching mechanisms (7) are connected to the ends of the first oil inlet branch pipe (202) and the third oil inlet branch pipe (204) respectively. The two connecting pipes (702) on the other switching mechanism (7) are connected to the first connecting branch pipe (302) and the third connecting branch pipe (304) respectively.

7. A tertiary oil and gas recovery device according to claim 5, characterized in that, The adjustment assembly includes a threaded shaft (707) and a nut (708). The threaded shaft (707) is located on the adjustment tube (703), and the nut (708) is located on the sleeve (701). The threaded shaft (707) and the nut (708) are threadedly engaged.

8. A tertiary oil and gas recovery device according to claim 5, characterized in that, The regulating tube (703) has three indicator marks (11) along its length, and the distance between two adjacent indicator marks (11) is equal to half the center distance between the two through holes (704) on the regulating tube (703).

9. A tertiary oil and gas recovery device according to claim 4, characterized in that, The venting pipe assembly (6) includes a venting pipe (601), a second solenoid valve (602), and a concentration sensor (603). One end of the venting pipe (601) is connected to the main connecting pipe (301), and the other end is the venting port. The second solenoid valve (602) and the concentration sensor (603) are respectively installed on the venting pipe (601).

10. A tertiary oil and gas recovery device according to claim 1, characterized in that, The return oil pipe (8) is equipped with a return oil manual valve (10).

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