Pressure adjusting device of membrane nitrogen-making pressurization system

Abstract

The utility model discloses a pressure regulating device of a membrane nitrogen production pressurization system, and belongs to the field of nitrogen production. The air cylinder comprises an air cylinder body, an air inlet and an air outlet are formed in the side wall of the air cylinder body, a piston cavity is formed in the air cylinder body, a piston is arranged in the piston cavity, the piston is driven by a driving mechanism to reciprocate in the piston cavity, and an air cylinder cover is fixedly installed on the inner side wall of an opening of the piston cavity. An end cover is fixedly installed at an opening of the piston cavity, and an adjusting piece tightly attached to the inner side wall of the air cylinder cover is arranged in the piston cavity. A through hole for a bolt to penetrate through is formed in the middle of the end cover, and a threaded hole matched with the bolt is formed in the middle of the adjusting piece. According to the utility model, the air inlet pressure of the membrane nitrogen-making supercharging equipment can be adjusted without adopting an adjusting valve or a bypass branch pipe, and the system power consumption and energy loss during air inlet pressure adjustment can be reduced.

Description

Technical Field

[0001] The utility model belongs to the field of nitrogen production, and more specifically, relates to a pressure regulating device for a membrane nitrogen production supercharging system. Background Art

[0002] For membrane nitrogen separation and production, the main manufacturing process is that a screw compressor compresses air, the compressed air enters the nitrogen production module to obtain high-purity nitrogen, and finally a piston compressor supercharges the nitrogen. The cost of the membrane in this system accounts for a large proportion. In order to save the cost of the membrane, usually the gas pressure entering the module is increased as much as possible within the pressure-bearing range of the module to reduce the number of membranes. However, due to the change of working conditions and the long-term operation of the equipment, the maximum pressure-bearing range of the module is also changing. Therefore, it is necessary to adjust the intake pressure during equipment maintenance and repair to ensure the use of the minimum number of membranes.

[0003] In the existing membrane nitrogen production supercharging equipment, a relatively common intake pressure adjustment method is to install a throttle valve or a proportional valve on the exhaust pipeline of the nitrogen production module, and adjust the pressure before the valve by changing the size of the valve flow port; another method is to install a bypass pipe on the exhaust pipeline and connect it to the suction pipe, and install a valve on the bypass pipeline. By opening the valve on the bypass pipeline, part or all of the discharged gas returns to the suction pipeline to achieve the effect of reducing the exhaust pressure. However, both of these adjustment methods consume a large amount of power and cause a large energy loss to the system, especially in a high-pressure nitrogen compression system.

[0004] For example, the patent document with the Chinese patent application number: CN201310418739.X and the publication date: March 25, 2015 discloses a membrane nitrogen separation and production device, which relates to the field of nitrogen production technology. The device includes an air compressor, an air storage tank, a pressure regulating valve, a primary filter, a cold dryer, a secondary filter, a tertiary filter, an air flow meter, a heater, an intake valve, a filter membrane, a buffer tank, and a nitrogen supercharger connected in sequence through pipelines; an air pressure gauge and a vent valve are installed on the air storage tank, a nitrogen pressure gauge is installed on the buffer tank, a thermometer and an inlet pressure gauge are installed on the pipeline between the heater and the intake valve; a vent valve is installed on the pipeline between the filter membrane and the buffer tank. This solution uses devices such as vent valves to adjust the intake pressure of the membrane nitrogen production supercharging equipment, and there are problems of consuming a large amount of power and large system energy loss.

[0005] Moreover, the patent document with Chinese Patent Application No.: CN201920137654.7 and publication date: November 19, 2019 discloses a membrane separation nitrogen generation control device for air inflation and conditioning suitable for grain depots. It can automatically control the nitrogen generation system to switch and operate in three stages according to the detected data in circulation, and preferentially inhale the high-nitrogen-content gas discharged from the granary into the air compressor to separate nitrogen with higher purity under the same flow rate, so as to achieve the effects of energy conservation, emission reduction, and rapid nitrogen filling. The membrane separation nitrogen generation control device involved in this utility model includes an air compressor, a cold dryer, a re-cooler, a membrane module, a heater, a first filter component, a second filter component, a first to fourth temperature transmitter, a first to third pressure transmitter, a flow transmitter, a first regulating valve, a second regulating valve, a first to fourth stop valve arranged on the nitrogen generation control device, as well as a PLC control box and a circulation detection device connected to the above electrical components. This solution also realizes the intake air pressure regulation of the membrane nitrogen generation pressurization equipment through devices such as pressure transmitters and regulating valves, which has the problems of large power consumption and large system energy loss. Summary of the Invention

[0006] 1. Problems to be Solved

[0007] Aiming at the problems in the existing membrane nitrogen generation pressurization equipment that the intake air pressure is regulated by using a regulating valve or a bypass branch pipe, with large power consumption and large system energy loss, the present utility model provides a pressure regulating device for a membrane nitrogen generation pressurization system, which can realize the intake air pressure regulation of the membrane nitrogen generation pressurization equipment without using a regulating valve or a bypass branch pipe, and can reduce the system power consumption and energy loss during the intake air pressure regulation.

[0008] 2. Technical Solutions

[0009] To solve the above problems, the present utility model adopts the following technical solutions.

[0010] A pressure regulating device for a membrane nitrogen generation pressurization system includes a cylinder block. An air inlet and an air outlet are provided on the side wall of the cylinder block. A piston chamber is opened in the cylinder block. A piston is arranged in the piston chamber. The piston is driven by a driving mechanism to reciprocate in the piston chamber. A cylinder head is fixedly installed on the inner side wall at the opening of the piston chamber. An end cover is fixedly installed at the opening of the piston chamber. An adjusting member closely attached to the inner side wall of the cylinder head is arranged in the piston chamber; a through hole for a bolt to pass through is opened in the middle of the end cover, and a threaded hole matched with the bolt is opened in the middle of the adjusting member.

[0011] As a further improvement of the technical solution, a second sealing ring sleeved on the bolt is arranged between the bolt and the inner side wall of the through hole of the end cover.

[0012] As a further improvement of the technical solution, a slide rail extending along the length direction of the bolt is provided on the inner side wall of the cylinder head, and a slider slidably connected to the slide rail is provided on the outer side wall of the adjusting member.

[0013] As a further improvement of the technical solution, a first sealing ring sleeved on the adjusting member is provided between the adjusting member and the inner side wall of the cylinder head.

[0014] As a further improvement of the technical solution, an avoidance groove matching the slide rail is provided at the part of the first sealing ring in contact with the slide rail.

[0015] As a further improvement of the technical solution, the driving mechanism includes a connecting rod and a crankshaft. One end of the connecting rod is hinged to the piston, and the other end is hinged to one end of the connecting crankshaft.

[0016] As a further improvement of the technical solution, the cylinder block communicates with the crankcase, and the other end of the crankshaft is hinged to the inner wall of the crankcase. As a further improvement of the technical solution, the part of the bolt extending out of the end cover is sleeved with a grip cover.

[0017] As a further improvement of the technical solution, anti-slip patterns are provided on the outer side of the grip cover.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] (1) For the pressure regulating device of the membrane nitrogen production supercharging system of the present utility model, by rotating the bolt to control the movement of the adjusting member in the piston cavity, the maximum space between the adjusting member and the piston changes, thereby regulating the intake pressure of the membrane nitrogen production supercharging equipment. Different from the prior art which adjusts the intake air volume through a regulating valve or a bypass branch pipe, it greatly reduces the consumption of system power and energy loss;

[0021] (2) For the pressure regulating device of the membrane nitrogen production supercharging system of the present utility model, by providing the first sealing ring and the second sealing ring, it can prevent the gas in the piston cavity from leaking from the bolt and the adjusting member, ensuring the stability of the air pressure in the piston cavity;

[0022] (3) For the pressure regulating device of the membrane nitrogen production supercharging system of the present utility model, through the cooperation of the slide rail and the slider, it is convenient for the adjusting member to move in the piston cavity. And by providing an avoidance groove matching the slide rail on the first sealing ring, the position where the first sealing ring contacts the slide rail can be fitted with the avoidance groove, ensuring the sealing effect;

[0023] (4) The pressure regulating device of a membrane nitrogen production pressurization system of the present utility model has a grip cover sleeved on the part of the bolt protruding from the end cover, which can facilitate the staff to rotate the bolt to adjust the position of the regulating part, and the anti-slip pattern arranged on the outer side of the grip cover makes it not easy for the staff to slip when rotating the bolt. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the pressure regulating device of the present utility model;

[0025] In the figure: 1. Cylinder block; 2. Crankcase; 3. Crankshaft; 4. Connecting rod; 5. Piston; 6. First sealing ring; 7. Regulating part; 8. Cylinder head; 9. End cover; 10. Second sealing ring; 11. Grip cover; 12. Bolt; 13. Piston chamber; 14. Intake port; 15. Outlet port. Detailed Embodiment

[0026] The following describes the exemplary embodiments of the present utility model in detail. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present utility model, it should be understood that other embodiments can be achieved and various changes can be made to the present utility model without departing from the spirit and scope of the present utility model. The following more detailed description of the embodiments of the present utility model does not limit the scope of the claimed present utility model, but is merely for illustrative purposes and does not limit the description of the features and characteristics of the present utility model, in order to present the best way to implement the present utility model and be sufficient to enable those skilled in the art to implement the present utility model. Therefore, the scope of the present utility model is only defined by the appended claims.

[0027] Embodiment 1

[0028] A pressure regulating device of a membrane nitrogen production pressurization system is used in a membrane nitrogen production pressurization device to regulate the intake pressure of the membrane nitrogen production pressurization device. The following describes its specific structure and technical effects in detail.

[0029] As Figure 1 shown, the device includes a cylinder block 1 and a crankcase 2 that are interconnected. Among them, an intake port 14 and an outlet port 15 are respectively arranged on the opposite side walls of the cylinder block 1, a piston chamber 13 is opened in the cylinder block 1, a piston 5 is arranged in the piston chamber 13, and the piston 5 is driven by a driving mechanism to reciprocate in the piston chamber 13. Specifically, the driving mechanism includes a connecting rod 4 and a crankshaft 3. One end of the connecting rod 4 is hinged to the piston 5, and the other end is hinged to one end of the crankshaft 3, and the other end of the crankshaft 3 is hinged to the inner wall of the crankcase 2. Through the movement of the crankshaft connecting rod mechanism, the piston can reciprocate in the piston chamber, and cooperate with the opening and closing of the intake port 14 and the outlet port 15 to achieve gas pressurization.

[0030] However, in the membrane nitrogen production booster equipment, since the cost of the membrane is relatively high, it is necessary to increase the gas pressure entering the module as much as possible within the pressure-bearing range of the nitrogen production module to reduce the number of membranes. Therefore, it is necessary to adjust the intake pressure of the membrane nitrogen production booster equipment. The prior art generally uses a regulating valve or a bypass branch pipe to achieve the adjustment of the intake air volume. This adjustment method has the problems of consuming a large amount of power and large energy loss in the system. In response to this problem, the following solutions are taken in this embodiment.

[0031] A cylinder head 8 is fixedly installed on the inner side wall at the opening of the piston chamber 13, an end cover 9 is fixedly installed at the opening of the piston chamber 13, and an adjusting member 7 is arranged in the piston chamber 13 and is closely attached to the inner side wall of the cylinder head 8. A through hole for the bolt 12 to pass through is opened in the middle of the end cover 9, a threaded hole matching the bolt 12 is opened in the middle of the adjusting member 7, and the bolt 12 passes through the through hole of the end cover 9 and is screwed into the threaded hole of the adjusting member 7.

[0032] By rotating the bolt 12, the movement of the adjusting member 7 in the piston chamber 13 can be controlled, so that the maximum space between the adjusting member 7 and the piston 5 changes, thereby adjusting the intake pressure of the membrane nitrogen production booster equipment. Different from the prior art that realizes the adjustment of the intake air volume through a regulating valve or a bypass branch pipe, it greatly reduces the consumption of system power and energy loss.

[0033] In addition, a second sealing ring 10 sleeved on the bolt 12 is arranged between the bolt 12 and the inner side wall of the through hole of the end cover 9. A slide rail extending along the length direction of the bolt 12 is arranged on the inner side wall of the cylinder head 8, and a slide block slidably connected with the slide rail is arranged on the outer side wall of the adjusting member 7. At the same time, a first sealing ring 6 sleeved on the adjusting member 7 is arranged between the adjusting member 7 and the inner side wall of the cylinder head 8, and an avoidance groove matching the slide rail is arranged at the position where the first sealing ring 6 contacts the slide rail.

[0034] By providing the first sealing ring 6 and the second sealing ring 10, the gas in the piston chamber 13 can be prevented from leaking from the bolt 12 and the adjusting member 7, ensuring the stability of the air pressure in the piston chamber 13. Through the cooperation of the slide rail and the slide block, the movement of the adjusting member 7 in the piston chamber 13 can be facilitated. By providing an avoidance groove on the first sealing ring 6 that matches the slide rail, the position where the first sealing ring 6 contacts the slide rail can be fitted with the avoidance groove, ensuring the sealing effect.

[0035] It is worth mentioning that a grip cover 11 is sleeved on the part of the bolt 12 extending out of the end cover 9, and anti-slip patterns are arranged on the outer side of the grip cover 11. The grip cover 11 can facilitate the staff to rotate the bolt 12 to adjust the position of the adjusting member 7, and the anti-slip patterns make it not easy for the staff to slip when rotating the bolt 12.

[0036] In summary, the pressure regulating device of the membrane nitrogen production booster system of this embodiment can adjust the intake pressure of the membrane nitrogen production booster equipment without using a regulating valve or a bypass branch pipe, and can reduce the system power consumption and energy loss during the intake pressure regulation.

Claims

1. A pressure regulating device for a membrane nitrogen production and pressurization system, comprising a cylinder body (1), a gas inlet (14) and a gas outlet (15) being provided on a side wall of the cylinder body (1), a piston chamber (13) being provided in the cylinder body (1), a piston (5) being provided in the piston chamber (13), and the piston (5) being driven by a driving mechanism to reciprocate in the piston chamber (13), characterized in that: A cylinder head (8) is fixedly mounted on the inner side wall of the opening of the piston chamber (13); an end cover (9) is fixedly mounted on the opening of the piston chamber (13); an adjusting member (7) is arranged in the piston chamber (13) and is in close contact with the inner side wall of the cylinder head (8); a through hole for a bolt (12) to pass through is provided in the middle of the end cover (9); and a threaded hole matching the bolt (12) is provided in the middle of the adjusting member (7).

2. The pressure regulating device of the membrane nitrogen production and pressurization system according to claim 1 is characterized in that: A sealing ring 2 (10) sleeved on the bolt (12) is provided between the bolt (12) and the inner side wall of the through hole of the end cover (9).

3. The pressure regulating device of the membrane nitrogen production and pressurization system according to claim 1 is characterized in that: A slide rail extending along the length direction of the bolt (12) is arranged on the inner wall of the cylinder head (8), and a sliding block slidably connected to the slide rail is arranged on the outer wall of the adjusting member (7).

4. The pressure regulating device of the membrane nitrogen production and pressurization system according to claim 3 is characterized in that: A sealing ring (6) sleeved on the adjusting member (7) is arranged between the adjusting member (7) and the inner side wall of the cylinder cover (8).

5. The pressure regulating device of the membrane nitrogen production and pressurization system according to claim 4 is characterized in that: The portion where the sealing ring 1 (6) contacts the slide rail is provided with an avoidance groove matching the slide rail.

6. A pressure regulating device for a membrane nitrogen production and pressurization system according to any one of claims 1 to 5, characterized in that: The driving mechanism comprises a connecting rod (4) and a crankshaft (3); one end of the connecting rod (4) is hingedly connected to a piston (5), and the other end is hingedly connected to one end of the crankshaft (3).

7. The pressure regulating device of the membrane nitrogen production and pressurization system according to claim 6, characterized in that: The cylinder body (1) is connected to the crankcase (2), and the other end of the crankshaft (3) is hinged to the inner wall of the crankcase (2).

8. A pressure regulating device for a membrane nitrogen production and pressurization system according to any one of claims 1 to 5, characterized in that: The portion of the bolt (12) that protrudes from the end cover (9) is sleeved with a grip cover (11).

9. The pressure regulating device of the membrane nitrogen production and pressurization system according to claim 8, characterized in that: The outer side of the grip cover (11) is provided with anti-slip patterns.

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