Submersible electromagnetic large-thrust reciprocating oil production system

Abstract

The application discloses a kind of electromagnetic large thrust reciprocating oil production systems of submersible oil, including lead mechanism, driving mechanism and protector, wherein lead mechanism is arranged in the upper portion of driving mechanism, and protector is arranged between the lower portion of lead mechanism and driving mechanism, and upper liquid channel is assembled between lead mechanism and driving mechanism, and protector is sleeved with wire passing chamber, the top of wire passing chamber is connected with the bottom of lead mechanism, and the bottom of wire passing chamber is connected with the top of driving mechanism.Lead mechanism is a shell, and the shell is sleeved on the upper liquid channel, and the shell is connected with wire passing chamber, and the connecting part of shell and wire passing chamber is assembled with socket for connecting power line in wire passing chamber with external cable, and gas discharge liquid valve is further arranged on the sidewall of shell.The beneficial effects are as follows: the problems of complex motor winding process, low electromagnetic utilization rate and large winding heat quantity of existing reciprocating electric pump are solved, and the structural defects of traditional submersible oil pump and submersible screw pump structure are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil production system, in particular to a large thrust reciprocating oil production system of submersible electromagnetic. BACKGROUND

[0002] At present, the submersible rodless oil production industry mainly uses submersible motor centrifugal pump (referred to as submersible motor pump), submersible motor screw pump (referred to as submersible screw pump), numerical control reciprocating submersible motor pump (referred to as reciprocating motor pump) and other oil production equipment; but, in the process of use, there are many problems, which will be described one by one taking 5 inch half casing oil production as an example.

[0003] The submersible motor pump has large displacement (50-300 cubic meters per day), low pump efficiency, requires harsh downhole production well fluid conditions, and is suitable for oil field production in the initial stage and offshore oil field production with pump hanging of no more than 2000 meters;

[0004] The submersible screw pump is hung within 2000 meters, and the displacement is moderate (50 cubic meters per day). The motor, reducer, flexible shaft, screw pump and other components are required to be reliable in performance, safe and fault-free in operation at a deeper pump hanging. At present, all equipment cannot meet the user's requirements.

[0005] The reciprocating motor pump is hung at 2000 meters, and the displacement is less than 20 cubic meters per day. The motor can operate reliably, but the submersible cable is often broken, causing production to stop for maintenance, which cannot meet the user's needs.

[0006] In summary: at present, the oil field urgently needs an oil production equipment with a pump hanging depth of about 2000 meters, a displacement of less than 40 cubic meters per day, high reliability, low power consumption and suitable for various well conditions in the oil field. SUMMARY

[0007] The main purpose of the present application is to solve the problems existing in the process of oil production of the existing submersible motor pump, submersible screw pump and reciprocating motor pump, and to provide a large thrust reciprocating oil production system of submersible electromagnetic.

[0008] The large thrust reciprocating oil production system of submersible electromagnetic provided by the present application comprises a lead mechanism, a driving mechanism and a protector, wherein the lead mechanism is arranged at the upper part of the driving mechanism, the lower part of the lead mechanism and the driving mechanism are provided with the protector, the upper liquid inlet channel is assembled between the lead mechanism and the driving mechanism, the protector is sleeved with a wire passing chamber, the top of the wire passing chamber is connected with the bottom of the lead mechanism, and the bottom of the wire passing chamber is connected with the top of the driving mechanism.

[0009] The lead mechanism is a shell, the shell is sleeved on the upper liquid inlet channel, the shell is connected with the wire passing chamber, the connection between the shell and the wire passing chamber is assembled with a socket for connecting the power line in the wire passing chamber with the external cable, and a gas discharge liquid valve is also arranged on the side wall of the shell.

[0010] The driving mechanism comprises a stator, a mover, a fixed plug and a movable plug, wherein a plurality of coils are wound on the stator, the stator generates electromagnetic force after the coils are electrified, the stator is sleeved on the mover, the mover is composed of a plurality of permanent magnets, the mover and the upper pump barrel are formed in an integral structure, the mover and the upper pump barrel can move up and down under the action of the electromagnetic force generated by the stator, the fixed plug is inserted into the upper pump barrel, the fixed plug remains stationary during the up-and-down movement of the mover and the upper pump barrel, the movable plug is connected to the bottom of the mover and the upper pump barrel, the movable plug moves synchronously with the mover and the upper pump barrel, the top end of the upper pump barrel is connected to the bottom of the upper infusion channel, and the inner cavity of the upper pump barrel is in communication with the upper infusion channel.

[0011] The stator comprises a sealing tube, an iron core and a retaining ring, wherein the iron core is sleeved on the sealing tube, a plurality of rings of the iron core are equidistantly arranged along the radial direction of the sealing tube, a partition ring is arranged at the bottom of the adjacent rings of the iron core, the coils are wound on the partition ring, and the retaining ring is sleeved on the end portions of the upper and lower ends of the sealing tube. The sealing tube is sleeved on the mover and the upper pump barrel.

[0012] The permanent magnets on the mover comprise a plurality of rings, the plurality of rings of permanent magnets are equidistantly sleeved on the upper pump barrel, the plurality of rings of permanent magnets are formed in an integral structure with the upper pump barrel, a spacing ring is arranged between the adjacent rings of permanent magnets, a protection ring is sleeved on the outer periphery of each group of permanent magnets, each ring of permanent magnets is composed of eight equal parts, and the polarities of the adjacent rings of permanent magnets are opposite.

[0013] A valve cover is arranged at the lower end of the fixed plug, a first infusion port is arranged at the bottom of the valve cover, the first infusion port is in communication with the inner cavity of the upper pump barrel and the upper infusion channel, a first valve ball is arranged at the inlet of the first infusion port in the inner cavity of the valve cover, and a first return spring is connected to the top of the first valve ball.

[0014] A movable valve seat is connected to the bottom of the movable plug, a second infusion port is arranged at the bottom of the movable valve seat, the second infusion port is in communication with the inner cavity of the upper pump barrel and the upper infusion channel, a second valve ball is arranged at the inlet of the second infusion port in the inner cavity of the movable valve seat, and a second return spring is connected to the upper end of the second valve ball.

[0015] A lower pump barrel is sleeved on the upper pump barrel, a fixed valve seat is connected to the bottom of the lower pump barrel through a connecting piece, a lower infusion channel is arranged in the inner cavity of the fixed valve seat, the lower infusion channel is in communication with the inner cavity of the upper pump barrel through the inner cavity of the lower pump barrel and the second infusion port in the inner cavity of the movable valve seat, a third valve ball is arranged at the inlet of the lower infusion channel, a third return spring is connected to the upper portion of the third valve ball, and the top and bottom of the connecting piece are fixedly connected to the bottom of the lower pump barrel and the top of the fixed valve seat respectively.

[0016] The lower infusion channel, the inner cavity of the lower portion of the lower pump barrel, the inner cavity of the upper pump barrel and the upper infusion channel are sequentially in communication.

[0017] The protector comprises a rubber cylinder and a sleeve, the sleeve is sleeved on the upper liquid channel, the top of the sleeve is connected with the bottom of the lead mechanism, the bottom of the sleeve is connected with the top of the driving mechanism, the rubber cylinder is attached to the sleeve, the rubber cylinder and the sleeve are inserted into the wire passing chamber, and a liquid passing opening is formed in the sleeve, and the liquid passing opening is used for balancing the low-pressure liquid in the wire passing chamber outside the upper liquid channel.

[0018] Working principle of the present application:

[0019] The electromagnetic reciprocating oil production system provided by the present application uses input three-phase voltage to generate traveling wave electromagnetic force through the stator on the driving mechanism, the traveling wave electromagnetic force drives the mover and the upper pump cylinder to reciprocate, the mover and the upper pump cylinder drive the movable plug on the driving mechanism to synchronously move during reciprocation, and the oil well liquid is continuously transported to the ground through the lower liquid channel, the inner cavity of the lower pump cylinder, the second liquid inlet, the inner cavity of the upper pump cylinder, the first liquid inlet and the upper liquid channel during movement of the movable plug, and the specific working principle is as follows:

[0020] Upward stroke of the oil production system:

[0021] When the oil production system performs upward stroke operation, the mover, the upper pump cylinder and the movable plug move upward under the driving of the electromagnetic force generated by the stator, at this time, the third valve ball and the first valve ball are opened, the second valve ball is closed, and the drilling fluid enters the inner cavity of the lower pump cylinder from the lower liquid channel, is pressurized through the movable plug and then enters the inner cavity of the upper pump cylinder, and the pressurized drilling fluid is transported to the designated position on the ground after being input to the upper liquid channel from the inner cavity of the upper pump cylinder.

[0022] Downward stroke of the oil production system:

[0023] When the oil production system performs downward stroke operation, the mover, the upper pump cylinder and the movable plug move downward under the driving of the electromagnetic force generated by the stator, at this time, the third valve ball is closed, the first valve ball and the second valve ball are opened, and the drilling fluid enters the inner cavity of the upper pump cylinder from the inner cavity of the lower pump cylinder through the second liquid inlet, and then enters the upper liquid channel after passing through the first liquid inlet, and is transported to the designated position on the ground.

[0024] The first valve ball and the second valve ball have the same function, and when the second valve ball fails, the first valve ball can be used as a backup valve ball.

[0025] Advantages of the present application:

[0026] The submersible electromagnetic high-thrust reciprocating oil production system provided by this invention completely solves the problems of complex motor winding process, low electromagnetic utilization rate, and high heat generation of existing reciprocating electric pumps. The dual-pump structure for power transmission in this application completely solves the structural defects of traditional submersible electric pumps and submersible screw pumps, where the power system is located below the pump. Traditional submersible electric pumps and submersible screw pumps can only collect well fluid from the side of the pump into the single-acting plunger pump, making it impossible to use existing sand and gas prevention devices for oil pumps. At the same time, the well fluid cannot pass through the power system windings, making it impossible to reduce the winding temperature, limiting the use of the power unit, and causing large vibrations during operation. This application completely solves all of the aforementioned problems. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the submersible electromagnetic high-thrust reciprocating oil production system described in this invention.

[0028] Figure 2 This is a schematic diagram of the lead wire mechanism described in this invention.

[0029] Figure 3 This is a schematic diagram of the stator structure described in this invention.

[0030] Figure 4 This is a schematic diagram of the moving part structure described in this invention.

[0031] Figure 5 This is a partial structural diagram of the fixed plug described in this invention.

[0032] Figure 6 This is a partial structural diagram of the movable plug and lower pump cylinder described in this invention.

[0033] Figure 7 This is a schematic diagram of the protector structure described in this invention.

[0034] The annotations in the image above are as follows:

[0035] 1. Lead wire mechanism 2. Drive mechanism 3. Protector 4. Wire guide chamber 5. Housing

[0036] 6. Upper infusion channel; 7. Socket; 8. Vent infusion valve; 9. Stator; 10. Mover.

[0037] 11. Fixed plug; 12. Movable plug; 13. Coil; 14. Permanent magnet; 15. Upper pump cylinder

[0038] 16. Sealing tube; 17. Iron core; 18. Retaining ring; 19. Spacer ring; 20. Protective ring.

[0039] 21. Valve cover; 22. First infusion port; 23. First valve ball; 24. First return spring

[0040] 25, traveling valve seat 26, second liquid inlet 27, second valve ball 28, second return spring

[0041] 29, lower pump cylinder 30, connecting piece 31, fixed valve seat 32, lower liquid passage

[0042] 33, third valve ball 34, third return spring 35, rubber cylinder 36, sleeve

[0043] 37, liquid passage 38, spacer ring. DETAILED DESCRIPTION

[0044] Please refer to Figures 1 to 7 As shown:

[0045] The electromagnetic large thrust reciprocating oil production system for submersible pump provided by the application comprises a lead mechanism 1, a driving mechanism 2 and a protector 3, wherein the lead mechanism 1 is arranged at the upper part of the driving mechanism 2, the protector 3 is arranged between the lower part of the lead mechanism 1 and the driving mechanism 2, an upper liquid passage 6 is arranged between the lead mechanism 1 and the driving mechanism 2, the protector 3 is sleeved with a wire passing chamber 4, the top of the wire passing chamber 4 is connected with the bottom of the lead mechanism 1, and the bottom of the wire passing chamber 4 is connected with the top of the driving mechanism 2.

[0046] The lead mechanism 1 is a shell 5, the shell 5 is sleeved on the upper liquid passage 6, the shell 5 is connected with the wire passing chamber 4, a socket 7 is arranged at the connection position of the shell 5 and the wire passing chamber 4, which is used for connecting the power line in the wire passing chamber 4 with the external cable, and a gas discharge liquid valve 8 is arranged on the side wall of the shell 5.

[0047] The driving mechanism 2 comprises a stator 9, a rotor 10, a fixed plug 11 and a movable plug 12, wherein a plurality of coils 13 are arranged on the stator 9, the stator 9 is sleeved on the rotor 10, the rotor 10 is composed of a plurality of permanent magnets 14, the rotor 10 and an upper pump cylinder 15 are formed as an integral structure, the rotor 10 and the upper pump cylinder 15 can move up and down under the action of the electromagnetic force generated by the stator 9, the fixed plug 11 is inserted into the upper pump cylinder 15, the fixed plug 11 remains stationary during the up and down movement of the rotor 10 and the upper pump cylinder 15, the movable plug 12 is connected to the bottom of the rotor 10 and the upper pump cylinder 15, the movable plug 12 moves synchronously with the rotor 10 and the upper pump cylinder 15, the top end of the upper pump cylinder 15 is connected with the bottom of the upper liquid passage 6, the inner cavity of the upper pump cylinder 15 is communicated with the upper liquid passage 6, and the cross-sectional area of the fixed plug 11 is smaller than that of the movable plug 12.

[0048] The stator 9 comprises a sealing tube 16, a core 17 and a blocking ring 18, wherein the core 17 is sleeved on the sealing tube 16, a plurality of turns of the core 17 are equidistantly arranged along the radial direction of the sealing tube 16, the bottoms of the adjacent turns of the core 17 are provided with a spacer ring 19, the coil 13 is wound on the spacer ring 19, and the blocking ring 18 is sleeved on the ends of the upper and lower ends of the sealing tube 16. The sealing tube 16 is sleeved on the upper pump cylinder 15 and the upper pump cylinder 15.

[0049] The plurality of turns of the permanent magnet 14 on the upper pump cylinder 15 are equidistantly sleeved on the upper pump cylinder 15, the plurality of turns of the permanent magnet 14 are formed in an integral structure with the upper pump cylinder 15, the adjacent turns of the permanent magnet 14 are provided with a spacer ring 38, the outer periphery of each group of the permanent magnet 14 is sleeved with a protection ring 20, each turn of the permanent magnet 14 is composed of eight equal parts, and the adjacent turns of the permanent magnet 14 are opposite in polarity.

[0050] The bottom of the fixed plug 11 is provided with a valve cover 21, the bottom of the valve cover 21 is provided with a first infusion port 22, the first infusion port 22 is communicated with the inner cavity of the upper pump cylinder 15 and the upper infusion channel 6, the first valve ball 23 is arranged at the inlet of the first infusion port 22 in the inner cavity of the valve cover 21, and the top of the first valve ball 23 is connected with the first reset spring 24.

[0051] The bottom of the movable plug 12 is connected with a traveling valve seat 25, the bottom of the traveling valve seat 25 is provided with a second infusion port 26, the second infusion port 26 is communicated with the inner cavity of the upper pump cylinder 15 and the upper infusion channel 6, the second valve ball 27 is arranged at the inlet of the second infusion port 26 in the inner cavity of the traveling valve seat 25, and the upper end of the second valve ball 27 is connected with the second reset spring 28.

[0052] The upper pump cylinder 15 is sleeved with a lower pump cylinder 29, the bottom of the lower pump cylinder 29 is connected with a fixed valve seat 31 through a connecting piece 30, the inner cavity of the fixed valve seat 31 is provided with a lower infusion channel 32, the lower infusion channel 32 is communicated with the inner cavity of the upper pump cylinder 15 through the inner cavity of the lower pump cylinder 29 and the second infusion port 26 in the inner cavity of the traveling valve seat 25, the third valve ball 33 is arranged at the inlet of the lower infusion channel 32, the upper part of the third valve ball 33 is connected with the third reset spring 34, and the top and bottom of the connecting piece 30 are fixedly connected with the bottom of the lower pump cylinder 29 and the top of the fixed valve seat 31 respectively.

[0053] The lower infusion channel 32, the inner cavity of the lower part of the lower pump cylinder 29, the inner cavity of the upper pump cylinder 15 and the upper infusion channel 6 are sequentially communicated.

[0054] The protector 3 comprises a rubber cylinder 35 and a sleeve 36, wherein the sleeve 36 is sleeved on the upper liquid channel 6, the top of the sleeve 36 is connected with the bottom of the lead mechanism 1, the bottom of the sleeve 36 is connected with the top of the driving mechanism 2, the rubber cylinder 35 is attached to the sleeve 36, the rubber cylinder 35 and the sleeve 36 are inserted into the wire chamber 4, the sleeve 36 is provided with a liquid passage 37, and the low-pressure liquid in the wire chamber 4 outside the upper liquid channel 6 is balanced through the liquid passage 37.

[0055] The working principle of the present application is as follows:

[0056] The electromagnetic reciprocating oil production system provided by the present application uses three-phase voltage to generate a traveling wave electromagnetic force through the stator 9 on the driving mechanism 2, and the traveling wave electromagnetic force drives the mover 10 and the upper pump cylinder 15 to reciprocate, and the mover 10 and the upper pump cylinder 15 drive the movable plug 12 on the driving mechanism 2 to move synchronously during reciprocation, and the oil well liquid is continuously transported to the ground through the lower liquid channel 32, the inner cavity of the lower pump cylinder 29, the second liquid inlet 26, the inner cavity of the upper pump cylinder 15, the first liquid inlet 22 and the upper liquid channel 6 during the movement of the movable plug 12. The specific working principle is as follows:

[0057] Upward stroke of the oil production system:

[0058] When the oil production system performs upward stroke operation, the mover 10, the upper pump cylinder 15 and the movable plug 12 move upward under the driving of the electromagnetic force generated by the stator 9, at this time, the third valve ball 33 and the first valve ball 23 are opened, and the second valve ball 27 is closed, and the drilling fluid enters the inner cavity of the lower pump cylinder 29 from the lower liquid channel 32, is pressurized after passing through the movable plug 12, and then enters the inner cavity of the upper pump cylinder 15, and the pressurized drilling fluid is transported to the designated position on the ground after being input into the upper liquid channel 6 from the inner cavity of the upper pump cylinder 15.

[0059] Downward stroke of the oil production system:

[0060] When the oil production system performs downward stroke operation, the mover 10, the upper pump cylinder 15 and the movable plug 12 move downward under the driving of the electromagnetic force generated by the stator 9, at this time, the third valve ball 33 is closed, and the first valve ball 23 and the second valve ball 27 are opened, and the drilling fluid enters the inner cavity of the upper pump cylinder 15 from the inner cavity of the lower pump cylinder 29 through the second liquid inlet 26, and then enters the upper liquid channel 6 through the first liquid inlet 22, and is transported to the designated position on the ground.

[0061] The first valve ball 23 and the second valve ball 27 have the same function, and when the second valve ball 27 fails, the first valve ball 23 can be used as a backup valve ball.

Claims

1. A kind of electromagnetic big thrust reciprocating oil production system of submersible, including lead mechanism, driving mechanism and protector, wherein lead mechanism is arranged in the upper portion of driving mechanism, the lower portion of lead mechanism is equipped with the protector between driving mechanism, and upper liquid channel is assembled between lead mechanism and driving mechanism, the protector is equipped with the wire passing chamber around, the top of wire passing chamber is connected with the bottom of lead mechanism, the bottom of wire passing chamber is connected with the top of driving mechanism, it is characterized by: The driving mechanism comprises a stator, a mover, a fixed plug and a movable plug, wherein a plurality of coils are wound on the stator, the stator generates electromagnetic force after the coils are electrified, the stator is sleeved on the mover, the mover is composed of a plurality of permanent magnets, the mover and the upper pump barrel are formed in an integral structure, the mover and the upper pump barrel can move up and down under the action of the electromagnetic force generated by the stator, the fixed plug is inserted into the upper pump barrel, the fixed plug remains stationary during the up-and-down movement of the mover and the upper pump barrel, the movable plug is connected to the bottom of the mover and the upper pump barrel, the movable plug moves synchronously with the mover and the upper pump barrel, the top end of the upper pump barrel is connected to the bottom of the upper infusion channel, the inner cavity of the upper pump barrel is in communication with the upper infusion channel, and the cross-sectional area of the fixed plug is smaller than that of the movable plug.

2. A submersible electromagnetic high thrust reciprocating oil production system according to claim 1, characterized in that: The driving mechanism comprises a stator, a mover, a fixed plug and a movable plug, wherein a plurality of coils are wound on the stator, the stator generates electromagnetic force after the coils are electrified, the stator is sleeved on the mover, the mover is composed of a plurality of permanent magnets, the mover and the upper pump barrel are formed in an integral structure, the mover and the upper pump barrel can move up and down under the action of the electromagnetic force generated by the stator, the fixed plug is inserted into the upper pump barrel, the fixed plug remains stationary during the up-and-down movement of the mover and the upper pump barrel, the movable plug is connected to the bottom of the mover and the upper pump barrel, the movable plug moves synchronously with the mover and the upper pump barrel, the top end of the upper pump barrel is connected to the bottom of the upper infusion channel, the inner cavity of the upper pump barrel is in communication with the upper infusion channel, and the cross-sectional area of the fixed plug is smaller than that of the movable plug.

3. The system of claim 1, wherein: The driving mechanism comprises a stator, a mover, a fixed plug and a movable plug, wherein a plurality of coils are wound on the stator, the stator generates electromagnetic force after the coils are electrified, the stator is sleeved on the mover, the mover is composed of a plurality of permanent magnets, the mover and the upper pump barrel are formed in an integral structure, the mover and the upper pump barrel can move up and down under the action of the electromagnetic force generated by the stator, the fixed plug is inserted into the upper pump barrel, the fixed plug remains stationary during the up-and-down movement of the mover and the upper pump barrel, the movable plug is connected to the bottom of the mover and the upper pump barrel, the movable plug moves synchronously with the mover and the upper pump barrel, the top end of the upper pump barrel is connected to the bottom of the upper infusion channel, the inner cavity of the upper pump barrel is in communication with the upper infusion channel, and the cross-sectional area of the fixed plug is smaller than that of the movable plug.

4. The system of claim 1, wherein: The driving mechanism comprises a stator, a mover, a fixed plug and a movable plug, wherein a plurality of coils are wound on the stator, the stator generates electromagnetic force after the coils are electrified, the stator is sleeved on the mover, the mover is composed of a plurality of permanent magnets, the mover and the upper pump barrel are formed in an integral structure, the mover and the upper pump barrel can move up and down under the action of the electromagnetic force generated by the stator, the fixed plug is inserted into the upper pump barrel, the fixed plug remains stationary during the up-and-down movement of the mover and the upper pump barrel, the movable plug is connected to the bottom of the mover and the upper pump barrel, the movable plug moves synchronously with the mover and the upper pump barrel, the top end of the upper pump barrel is connected to the bottom of the upper infusion channel, the inner cavity of the upper pump barrel is in communication with the upper infusion channel, and the cross-sectional area of the fixed plug is smaller than that of the movable plug.

5. The system of claim 1, wherein: The driving mechanism comprises a stator, a mover, a fixed plug and a movable plug, wherein a plurality of coils are wound on the stator, the stator generates electromagnetic force after the coils are electrified, the stator is sleeved on the mover, the mover is composed of a plurality of permanent magnets, the mover and the upper pump barrel are formed in an integral structure, the mover and the upper pump barrel can move up and down under the action of the electromagnetic force generated by the stator, the fixed plug is inserted into the upper pump barrel, the fixed plug remains stationary during the up-and-down movement of the mover and the upper pump barrel, the movable plug is connected to the bottom of the mover and the upper pump barrel, the movable plug moves synchronously with the mover and the upper pump barrel, the top end of the upper pump barrel is connected to the bottom of the upper infusion channel, the inner cavity of the upper pump barrel is in communication with the upper infusion channel, and the cross-sectional area of the fixed plug is smaller than that of the movable plug.

6. A submersible electromagnetic high thrust reciprocating oil production system according to claim 1, characterized in that: The protector comprises a rubber cylinder and a sleeve, the sleeve is sleeved on the upper infusion channel, the top of the sleeve is connected with the bottom of the lead mechanism, the bottom of the sleeve is connected with the top of the driving mechanism, the rubber cylinder is attached to the sleeve, the rubber cylinder and the sleeve are inserted into the wire passing chamber, and a liquid passing opening is formed in the sleeve, through which the low-pressure liquid in the wire passing chamber outside the upper infusion channel is balanced.

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