Double-row piston type VPSA compressor for oxygen production

Abstract

The utility model discloses a kind of double-row piston type VPSA compressor for oxygen production, including compressor body, the second cylinder and the first cylinder are respectively arranged in the top of compressor body, second cylinder and the first cylinder top end are connected with valve chamber cover, second cylinder and the first cylinder top are all provided with check valve, single-hole air inlet hole and double-hole exhaust hole are opened in check valve, motor stator is set on compressor body, motor stator is connected with motor rotor inside, motor rotor two sides are respectively connected with positive pressure piston connecting rod and negative pressure piston connecting rod, the top of positive pressure piston connecting rod and negative pressure piston connecting rod is respectively connected with piston positive pressure sealing element and piston negative pressure sealing element. The device is integrated in the same body by a group of negative pressure pistons and a group of positive pressure pistons side by side, realizes that positive pressure compression and negative pressure vacuumizing are synchronously completed in the same compressor, with the advantages of shortest gas exchange path, compact structure, low noise, good sealing dustproof, suitable for complex working conditions.

Description

Technical Field

[0001] This utility model relates to the technical field of oxygen gas compression equipment, specifically a double-row piston VPSA compressor for oxygen production. Background Technology

[0002] Vacuum pressure swing adsorption (VPSA) oxygen generation technology utilizes the characteristic that zeolite molecular sieves have increased nitrogen adsorption capacity under high pressure and decreased adsorption capacity under negative pressure (vacuum). Oxygen and nitrogen separation is achieved by periodically changing the pressure of the adsorption tower. This process places two core requirements on the gas source: first, to provide a stable positive pressure compressed air to the adsorption tower (positive pressure adsorption stage); second, to evacuate the adsorption tower during the desorption stage (negative pressure regeneration stage). The three mainstream solutions in existing technologies and their shortcomings are as follows: 1. Roots blower + 1. Water ring vacuum pumps have drawbacks such as high energy consumption, cumbersome maintenance, high noise and vibration, oil / water contamination of molecular sieves, and low system integration. 2. Single-function piston compressors can only provide positive pressure; negative pressure regeneration requires a separate vacuum pump, making it impossible to achieve dual-function operation. 3. Single-cylinder reciprocating compressors have issues such as time-sharing of positive and negative pressure, large airflow pulsation, significant flow fluctuations, complex reversing mechanisms, long intake and exhaust paths, high flow resistance, prominent valve opening and closing noise, poor dustproof sealing, and difficulty in adapting to complex operating conditions such as vehicle-mounted applications. In summary, existing technologies generally suffer from low system integration, the need for multiple units to work together for positive / negative pressure, long airflow paths, high noise, and poor dustproof sealing. They are particularly difficult to simultaneously meet the comprehensive requirements for size, noise, lifespan, and reliability under various complex operating conditions, thus requiring improvement. Utility Model Content

[0003] The purpose of this invention is to provide a double-row piston VPSA compressor for oxygen production, so as to solve the problems of long airflow path and high noise in the gas compressors mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a double-row piston VPSA compressor for oxygen production, comprising a compressor body, a second cylinder and a first cylinder respectively arranged on the top two sides of the compressor body, a valve chamber cover connected to the top of the second cylinder and the first cylinder, a one-way valve arranged on the top of the second cylinder and the first cylinder, the one-way valve having a single-hole air inlet and a double-hole exhaust port, a motor stator arranged on the compressor body, a motor rotor connected inside the motor stator, a positive pressure piston rod and a negative pressure piston rod respectively connected to the two sides of the motor rotor, a piston positive pressure seal and a piston negative pressure seal respectively connected to the top of the positive pressure piston rod and the negative pressure piston rod, the piston positive pressure seal and the piston negative pressure seal respectively located at the bottom of the second cylinder and the first cylinder, and a second body silencer sealing cover and a first body silencer sealing cover respectively fixedly connected to the two sides of the compressor body.

[0005] Preferably, the inner walls of the second body silencer sealing cover and the first body silencer sealing cover are both raised structures, and both the second body silencer sealing cover and the first body silencer sealing cover are connected with sealing cover fixing screws, one end of which is fixedly connected to the compressor body.

[0006] Preferably, both the second cylinder and the first cylinder are connected to cylinder fixing screws, one end of which is fixedly connected to the compressor body, and the compressor body is connected to compressor fixing screws.

[0007] Preferably, rotor bearings are connected to both sides of the motor rotor, and an eccentric counterweight wheel is provided on one side of the rotor bearing. An eccentric counterweight wheel locking screw is connected to the eccentric counterweight wheel.

[0008] Preferably, both the positive pressure piston rod and the negative pressure piston rod are provided with piston rod bearings at their lower ends, and the piston rod bearings are located on one side of the eccentric counterweight wheel.

[0009] Preferably, a valve plate cylinder sealing ring is provided between the inner wall of the second cylinder and the first cylinder and the outer wall of the one-way valve, and an exhaust one-way valve plate is covered on the top of the double-hole exhaust port of the one-way valve, and an exhaust one-way valve plate limiting plate is provided on the top of the exhaust one-way valve plate.

[0010] Preferably, an exhaust one-way valve fixing screw is connected to the exhaust one-way valve plate limiting plate, and the exhaust one-way valve fixing screw passes through the exhaust one-way valve plate limiting plate and the exhaust one-way valve plate to connect with the one-way valve.

[0011] Preferably, the top of the one-way valve has a groove, and a valve plate and valve chamber seal is provided inside the groove. A valve plate cylinder seal ring is fitted at the bottom of the one-way valve, and an air inlet one-way valve plate is provided at the bottom of the valve plate cylinder seal ring. An air inlet one-way valve plate limit plate is provided at the bottom of the air inlet one-way valve plate, and a valve plate fixing screw is connected to the air inlet one-way valve plate limit plate. One end of the valve plate fixing screw is connected to the bottom of the one-way valve.

[0012] Preferably, both the piston positive pressure seal and the piston negative pressure seal are provided with piston seal pressure plates at their tops, and pressure plate fixing screws are connected to the piston seal pressure plates. The bottom of the pressure plate fixing screws is fixedly connected to the positive pressure piston rod and the negative pressure piston rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) This device integrates a set of negative pressure pistons and a set of positive pressure pistons in the same body, so that positive pressure compression and negative pressure vacuuming can be completed synchronously and collaboratively in the same compressor. It has the advantages of the shortest air exchange path, compact structure, low noise, good sealing and dust prevention, and suitability for complex working conditions.

[0014] (2) This device sets a second cylinder and a first cylinder on the top of the compressor body. A one-way valve is set on the top of the second cylinder and the first cylinder. The one-way valve is used for air intake and exhaust between the piston positive pressure seal and the piston negative pressure seal. Positive and negative pressure air exchange is completed at the top of the second cylinder and the first cylinder and the piston positive pressure seal and the piston negative pressure seal. The air intake and exhaust do not pass through the motor and other positions. The air exchange path is the shortest and the efficiency is high.

[0015] (3) This device sets a second body noise reduction sealing cover and a first body noise reduction sealing cover on both sides of the compressor body. The inner walls of the second body noise reduction sealing cover and the first body noise reduction sealing cover have a convex structure, which has a good noise reduction effect, thereby reducing the overall operating noise. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a double-row piston VPSA compressor for oxygen production according to this utility model; Figure 2 This is an exploded view of a double-row piston VPSA compressor for oxygen production according to the present invention; Figure 3 This is a side view of a double-row piston VPSA compressor for oxygen production according to the present invention; Figure 4 This is a front view of a double-row piston VPSA compressor for oxygen production according to this utility model; Figure 5 This is a cross-sectional view of a double-row piston VPSA compressor for oxygen production according to this utility model; Figure 6 This is a top view of a double-row piston VPSA compressor for oxygen production according to this utility model; Figure 7 This is a top sectional view of a double-row piston VPSA compressor for oxygen production according to this utility model.

[0017] In the diagram: 1. Motor stator; 2. Cylinder fixing screw; 3. Second cylinder; 4. Motor rotor; 5. Compressor body; 6. Rotor bearing; 7. Compressor fixing screw; 8. First body silencer sealing cover; 9. Sealing cover fixing screw; 10. Second body silencer sealing cover; 11. Eccentric counterweight wheel; 12. Positive pressure piston connecting rod; 13. Piston connecting rod bearing; 14. Eccentric counterweight wheel locking screw; 15. Negative pressure piston connecting rod; 16. Piston. 17. Positive pressure seal; 18. Piston seal pressure plate; 19. Pressure plate fixing screw; 20. Piston negative pressure seal; 21. First cylinder; 22. One-way valve; 23. Valve plate cylinder sealing ring; 24. Valve plate valve chamber seal; 25. Inlet one-way valve plate; 26. Inlet one-way valve plate limit plate; 27. Valve plate fixing screw; 28. Exhaust one-way valve plate; 29. ​​Exhaust one-way valve plate limit plate; 30. Valve chamber cover. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-7 This utility model provides a technical solution: a double-row piston VPSA compressor for oxygen production, including a compressor body 5. A second cylinder 3 and a first cylinder 20 are respectively arranged on both sides of the top of the compressor body 5. Cylinder fixing screws 2 are connected to both the second cylinder 3 and the first cylinder 20. One end of the cylinder fixing screw 2 is fixedly connected to the compressor body 5. Compressor fixing screws 7 are connected to the compressor body 5. This structure ensures the overall robustness of the device. The inner walls of the second cylinder 3 and the first cylinder 20 are flush with... A valve plate cylinder sealing ring 22 is provided between the outer walls of the one-way valve 21. The top of the double-hole exhaust port of the one-way valve 21 is covered with an exhaust one-way valve plate 27. An exhaust one-way valve plate limiting plate 28 is provided on the top of the exhaust one-way valve plate 27. The one-way valve 21 is used to restrict the flow direction of airflow. The second cylinder 3 and the first cylinder 20 can achieve the function of dual-row operation. An exhaust one-way valve fixing screw 29 is connected to the exhaust one-way valve plate limiting plate 28. The exhaust one-way valve fixing screw 29 passes through the exhaust one-way valve plate limiting plate 28 and the exhaust one-way valve plate limiting plate 28. One-way valve plate 27 is connected to one-way valve 21. Exhaust one-way valve plate limiting plate 28 can limit the exhaust one-way valve plate 27. Intake is opened when the piston of the first cylinder 20 moves downward, and exhaust is opened through the double-hole exhaust port when the piston of the negative pressure piston connecting rod 15 moves upward. Exhaust one-way valve plate limiting plate 28 and exhaust one-way valve plate 27 are provided with specific height limiting plates to reduce noise. A groove is opened on the top of one-way valve 21, and a valve plate and valve chamber seal 23 is provided inside the groove. A valve plate gas valve is sleeved at the bottom of one-way valve 21. The cylinder seal ring 22 has an intake one-way valve plate 24 at its bottom, an intake one-way valve plate limit plate 25 at its bottom, and a valve plate fixing screw 26 connected to the intake one-way valve plate limit plate 25. One end of the valve plate fixing screw 26 is connected to the bottom of the one-way valve 21. The top of the second cylinder 3 and the first cylinder 20 are both connected to the valve chamber cover 30. The top of the second cylinder 3 and the first cylinder 20 are both equipped with one-way valves 21. The one-way valves 21 have a single-hole intake hole and a double-hole exhaust hole.

[0020] The compressor body 5 is equipped with a motor stator 1, and a motor rotor 4 is connected inside the motor stator 1. Rotor bearings 6 are connected to both sides of the motor rotor 4. An eccentric counterweight wheel 11 is provided on one side of the rotor bearing 6. The eccentric counterweight wheel 11 is used to balance the inertial force generated by the reciprocating motion of the piston and reduce the vibration of the whole machine. An eccentric counterweight wheel locking screw 14 is connected to the eccentric counterweight wheel 11. During the rotation of the motor rotor 4, the rotor bearings 6 and the eccentric counterweight wheel 11 can be driven to rotate. Positive pressure piston rod 12 and negative pressure piston rod 15 are respectively connected to both sides of the motor rotor 4. A piston rod bearing 13 is provided at the lower end of both the positive pressure piston rod 12 and the negative pressure piston rod 15. The piston rod bearing 13 is located on one side of the eccentric counterweight wheel 11. The positive pressure piston rod 12 and the negative pressure piston rod 15, as well as the piston positive pressure seal 16 and the piston negative pressure seal 19, are driven by the same drive mechanism, the motor rotor 4, to realize the synchronous completion of positive pressure compression and negative pressure vacuuming.

[0021] The positive pressure piston connecting rod 12 and the negative pressure piston connecting rod 15 are respectively connected to the top of a piston positive pressure seal 16 and a piston negative pressure seal 19. A piston seal pressure plate 17 is provided on the top of both the piston positive pressure seal 16 and the piston negative pressure seal 19. A pressure plate fixing screw 18 is connected to the piston seal pressure plate 17, and the bottom of the pressure plate fixing screw 18 is fixedly connected to the positive pressure piston connecting rod 12 and the negative pressure piston connecting rod 15. The piston positive pressure seal 16 and the piston negative pressure seal 19 are respectively located at the bottom of the second cylinder 3 and the first cylinder 20. A second body silencer sealing cover 10 is fixedly connected to both sides of the compressor body 5. The first body silencer sealing cover 8 is connected to the oxygen generating mechanism at the inlet and outlet of the compressor body 5. The compressor body 5 at other locations has a sealed structure to prevent sand and dust from entering and to extend its service life. It is suitable for various complex working conditions. The inner walls of the second body silencer sealing cover 10 and the first body silencer sealing cover 8 are both raised structures. Both the second body silencer sealing cover 10 and the first body silencer sealing cover 8 are connected to sealing cover fixing screws 9. One end of the sealing cover fixing screws 9 is fixedly connected to the compressor body 5. The second body silencer sealing cover 10 and the first body silencer sealing cover 8 are used to reduce the noise generated by the operation of the piston connecting rod.

[0022] Working Principle: When using this oxygen-generating double-row piston VPSA compressor, first, install and fix the compressor body 5 to the corresponding position of the oxygen-generating equipment using the compressor fixing screws 7. Then, correctly connect the inlet and outlet ports at the top of the second cylinder 3 and the first cylinder 20 to the gas path system of the molecular sieve adsorption tower, ensuring that the gas path is unobstructed and reliably sealed. After the connection is completed, turn on the power. The motor stator 1 is energized and generates a rotating magnetic field, driving the motor rotor 4 to start rotating. When the motor rotor 4 rotates, it drives the positive pressure piston rod 12 and the negative pressure piston rod 15 on both sides to reciprocate synchronously. The piston connecting rod 12 drives the positive pressure seal 16 to reciprocate up and down in the second cylinder 3, while the negative pressure piston connecting rod 15 drives the negative pressure seal 19 to reciprocate up and down in the first cylinder 20. Since both the positive and negative pressure piston connecting rods 12 and 15 are connected to the same motor rotor 4 and are symmetrically arranged, their movements are in opposite phases. That is, when one piston moves upward to compress, the other piston moves downward to draw in air. The two sets of pistons work alternately, making the overall machine operation smoother and effectively reducing airflow pulsation. In the first cylinder 20, when the negative pressure seal 19 moves downward, the first cylinder... As the internal volume of cylinder 20 increases and the pressure decreases, a negative pressure is created. At this time, the inlet check valve 24 opens under the external gas pressure, and gas is drawn into the first cylinder 20 through the single-hole inlet. Simultaneously, the exhaust check valve 27 remains closed under the negative pressure, completing the suction process and achieving vacuum desorption and regeneration of the adsorption tower. When the piston negative pressure seal 19 moves upward, the internal volume of the first cylinder 20 decreases, and the gas is compressed. At this time, the inlet check valve 24 closes under pressure, and the gas is discharged outward through the double-hole exhaust port of the check valve 21, opening the exhaust check valve 27. During the exhaust process, the exhaust one-way valve plate limiter 28 limits the lift of the exhaust one-way valve plate 27 within a predetermined range, effectively suppressing valve plate knocking noise. In the second cylinder 3, its working process is synchronized with the negative pressure side but in opposite phase. When the piston on the positive pressure side moves downward, it completes the intake; when it moves upward, it completes the compression exhaust. The output positive pressure gas is sent into the adsorption tower through the double-hole exhaust port for oxygen and nitrogen separation adsorption. The intake and exhaust of both cylinders are completed at the top of the cylinder and valve plate. The intake and exhaust paths do not pass through the motor or other internal spaces, achieving the shortest gas exchange path and significantly reducing flow resistance and energy loss.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-row piston VPSA compressor for oxygen production, comprising a compressor body (5), characterized in that: The compressor body (5) is provided with a second cylinder (3) and a first cylinder (20) on the top two sides respectively. The top of the second cylinder (3) and the first cylinder (20) are connected to valve chamber covers (30). The top of the second cylinder (3) and the first cylinder (20) are provided with one-way valves (21). The one-way valves (21) are provided with a single-hole inlet and a double-hole outlet. The compressor body (5) is provided with a motor stator (1). The motor stator (1) is connected to a motor rotor (4). The motor rotor (4) is provided with a second cylinder (3) and a first cylinder (20) on the top two sides respectively. A positive pressure piston rod (12) and a negative pressure piston rod (15) are connected. The top ends of the positive pressure piston rod (12) and the negative pressure piston rod (15) are respectively connected to a piston positive pressure seal (16) and a piston negative pressure seal (19). The piston positive pressure seal (16) and the piston negative pressure seal (19) are respectively located at the bottom of the second cylinder (3) and the first cylinder (20). The compressor body (5) is fixedly connected to the two sides of the compressor body (5) with a second body silencer seal cover (10) and a first body silencer seal cover (8).

2. The double-row piston VPSA compressor for oxygen production according to claim 1, characterized in that: The inner walls of the second body silencer sealing cover (10) and the first body silencer sealing cover (8) are both raised structures. Both the second body silencer sealing cover (10) and the first body silencer sealing cover (8) are connected with sealing cover fixing screws (9). One end of the sealing cover fixing screws (9) is fixedly connected to the compressor body (5).

3. The double-row piston VPSA compressor for oxygen production according to claim 1, characterized in that: Both the second cylinder (3) and the first cylinder (20) are connected to cylinder fixing screws (2). One end of the cylinder fixing screw (2) is fixedly connected to the compressor body (5). The compressor body (5) is connected to compressor fixing screws (7).

4. The double-row piston VPSA compressor for oxygen production according to claim 1, characterized in that: Both sides of the motor rotor (4) are connected to rotor bearings (6), and an eccentric counterweight wheel (11) is provided on one side of the rotor bearing (6). An eccentric counterweight wheel locking screw (14) is connected to the eccentric counterweight wheel (11).

5. A double-row piston VPSA compressor for oxygen production according to claim 1, characterized in that: Both the lower ends of the positive pressure piston rod (12) and the negative pressure piston rod (15) are provided with piston rod bearings (13), which are located on one side of the eccentric counterweight wheel (11).

6. A double-row piston VPSA compressor for oxygen production according to claim 1, characterized in that: A valve plate cylinder sealing ring (22) is provided between the inner wall of the second cylinder (3) and the first cylinder (20) and the outer wall of the one-way valve (21). The top of the double-hole exhaust port of the one-way valve (21) is covered with an exhaust one-way valve plate (27), and an exhaust one-way valve plate limit plate (28) is provided on the top of the exhaust one-way valve plate (27).

7. A double-row piston VPSA compressor for oxygen production according to claim 6, characterized in that: The exhaust one-way valve plate limiting plate (28) is connected to an exhaust one-way valve fixing screw (29), which passes through the exhaust one-way valve plate limiting plate (28) and the exhaust one-way valve plate (27) and connects to the one-way valve (21).

8. A double-row piston VPSA compressor for oxygen production according to claim 1, characterized in that: The one-way valve (21) has a groove on its top, and a valve plate valve chamber seal (23) is provided inside the groove. A valve plate cylinder seal ring (22) is fitted on the bottom of the one-way valve (21). An air inlet one-way valve plate (24) is provided at the bottom of the valve plate cylinder seal ring (22). An air inlet one-way valve plate limit plate (25) is provided at the bottom of the air inlet one-way valve plate (24). A valve plate fixing screw (26) is connected to the air inlet one-way valve plate limit plate (25). One end of the valve plate fixing screw (26) is connected to the bottom of the one-way valve (21).

9. A double-row piston VPSA compressor for oxygen production according to claim 1, characterized in that: The piston positive pressure seal (16) and piston negative pressure seal (19) are both provided with piston seal pressure plates (17) on their tops. The piston seal pressure plates (17) are connected with pressure plate fixing screws (18). The bottom of the pressure plate fixing screws (18) is fixedly connected to the positive pressure piston rod (12) and the negative pressure piston rod (15).

Images