An optimization method for protecting the piston rod from sinking in a hydrogen compressor

Abstract

The present invention discloses an optimization method for protecting the piston rod of a hydrogen compressor from sinking, and relates to the technical field of hydrogen compressor protection. The present invention comprises the following steps: first, a hydrogen sealing chamber and a nitrogen sealing chamber are sequentially arranged between a cylinder body and a crankcase provided in a hydrogen compressor, a piston rod is arranged at the center of the cylinder body, the hydrogen sealing chamber and the nitrogen sealing chamber, and secondly, a pressure sensor is arranged at the lower end of the hydrogen sealing chamber, and then an air intake pipe is arranged through the upper end of the nitrogen sealing chamber, a first threaded connecting pipe is arranged at one end of the air intake pipe, a bend is connected at the other end of the first threaded connecting pipe, and a nitrogen tank is connected at the other end of the bend; then, an electromagnetic valve for controlling whether the nitrogen tank flushes nitrogen into the nitrogen sealing chamber is arranged at one end of the bend near the nitrogen tank, and finally a control module is arranged on the crankcase, and the pressure sensor and the electromagnetic valve are electrically connected to the control module, when the piston rod sinks, the nitrogen tank flushes nitrogen into the nitrogen sealing chamber to prevent the piston rod from sinking, and the present invention has the advantages of being safer to use and having a better use effect.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen compressor protection, and in particular relates to an optimization method for hydrogen compressor piston rod sinking protection. Background Art

[0002] Hydrogen compressors are needed in some industrial production. Due to the low density and low volume energy density of hydrogen, hydrogen compressors must have the characteristics of high pressure bearing, large flow, safety and good sealing. While avoiding hydrogen embrittlement, they should seek as little power loss as possible. In the working principle of hydrogen compressors, the structure of hydrogen compressors is relatively complex. The more important components are cast iron cylinders, cast iron cylinder liners, cast iron cylinder heads, cast iron crankshafts, connecting rods, crossheads (including crosshead slideways), packings, pistons (including piston rings), scraper rings, stainless steel piston connecting rods, stainless steel valves, etc. In addition, there are some subordinate equipment, such as gas filters, buffers, lubricating oil pipelines, etc. Like other reciprocating compressors, hydrogen compressors include three processes: suction, compression and exhaust. Driven by the motor, the crankshaft drives the crosshead, piston connecting rod, and piston to reciprocate in the cylinder. The gas will be discharged through the valve under the compression of the piston. During the use of the hydrogen compressor, the piston rod will sink, affecting the use effect of the equipment. Therefore, certain measures need to be taken to prevent the piston rod of the hydrogen compressor from sinking.

[0003] The existing method for preventing the piston rod of a hydrogen compressor from sinking is to provide a detection device for the sinking of the piston rod of the hydrogen compressor recovered by exhaust gas. When the piston rod is detected to be sinking, a protective gas is introduced into the middle body bin on the hydrogen side. The original design was instrument gas. Due to the mixture of instrument gas and hydrogen in the material, an explosion will occur in a closed environment. Therefore, it is necessary to propose an optimized method for protecting the piston rod of a hydrogen compressor from sinking.

[0004] The existing method for preventing the piston rod of a hydrogen compressor from sinking has a potential safety hazard of explosion. In order to solve this problem, we propose an optimization method for protecting the piston rod of a hydrogen compressor from sinking. Summary of the invention

[0005] The purpose of the present invention is to provide an optimization method for protecting the piston rod of a hydrogen compressor from sinking, so as to solve the existing problems.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is an optimization method for protecting the piston rod of a hydrogen compressor from sinking, comprising the following steps:

[0008] Step 1, a hydrogen sealing chamber and a nitrogen sealing chamber are sequentially arranged between a cylinder body and a crankcase of a hydrogen compressor, wherein a piston rod is arranged at the center of the cylinder body, the hydrogen sealing chamber and the nitrogen sealing chamber;

[0009] Step 2, a pressure sensor is arranged at the lower end of the hydrogen sealed chamber;

[0010] Step 3, an air inlet pipe is provided through the upper end of the nitrogen sealing chamber, a first threaded connecting pipe is provided at one end of the air inlet pipe, the other end of the first threaded connecting pipe is connected to a bent pipe, and the other end of the bent pipe is connected to a nitrogen tank;

[0011] Step 4, a solenoid valve is arranged at one end of the bent pipe close to the nitrogen tank to control whether the nitrogen tank flushes nitrogen into the nitrogen sealing chamber;

[0012] Step 5. A control module is set on the crankcase. The pressure sensor and the solenoid valve are electrically connected to the control module. When the piston rod sinks, the lower part of the piston rod presses downward on the pressure sensor. The pressure sensor transmits a signal to the control module. The control module controls the solenoid valve to open, and the nitrogen tank flushes nitrogen into the nitrogen sealing chamber to prevent the piston rod from sinking.

[0013] Preferably, one end of the hydrogen sealing chamber is fixedly connected to the side wall of the cylinder body by screws, the other end of the hydrogen sealing chamber is fixedly connected to one end of the nitrogen sealing chamber by screws, and the other end of the nitrogen sealing chamber is fixedly connected to the side wall of the crankcase by screws. The hydrogen sealing chamber and the nitrogen sealing chamber have the same height, and the connection between the cylinder body, the hydrogen sealing chamber, the nitrogen sealing chamber and the crankcase is made tighter by the screw connection. Rubber sealing rings are provided between the connections to improve the sealing effect of the equipment.

[0014] Preferably, the hydrogen sealing chamber and the nitrogen sealing chamber are hollow inside, and the piston rod is driven to reciprocate by a driving motor and a connecting rod provided inside the crankcase, so that the piston rod reciprocates inside the hydrogen sealing chamber and the nitrogen sealing chamber, and the piston rod reciprocates inside the cylinder body, the hydrogen sealing chamber, and the nitrogen sealing chamber.

[0015] Preferably, a circular through hole is provided at one end of the cylinder body, and the circular through hole is located on the extension line of the central axis of the hydrogen sealing chamber. One end of the piston rod passes through the circular through hole and is fixedly provided with a pushing block. The pushing block is provided with a piston block at one end away from the piston rod. The diameter of the piston block is matched with the diameter of the inner wall of the cylinder body. The piston rod slides back and forth on the inner wall of the circular through hole, thereby driving the pushing block to move and finally driving the piston block to reciprocate on the inner wall of the cylinder body.

[0016] Preferably, a hydrogen pipe is connected through the upper end of the hydrogen sealing chamber, and an exhaust pipe is connected through the lower end of the hydrogen sealing chamber. The hydrogen pipe and the exhaust pipe are symmetrically distributed about the central axis of the hydrogen sealing chamber. A second threaded connecting pipe is provided at the upper end of the hydrogen pipe and the lower end of the exhaust pipe. A first valve is provided on the hydrogen pipe and the exhaust pipe. The first valves on the hydrogen pipe and the exhaust pipe respectively control whether the hydrogen pipe and the exhaust pipe are flowing.

[0017] Preferably, the pressure sensor is located directly below the piston rod, and a pressing block is provided at the upper end of the pressure sensor, an arc-shaped groove is provided on the upper surface of the pressing block, and the arc-shaped groove is adapted to the outer wall of the piston rod. When the piston rod sinks, the pressing block with the arc-shaped groove on the upper surface is pressed downward, and the pressing block presses down the pressure sensor.

[0018] Preferably, a control chip and a single-chip microcomputer are provided inside the control module. When the piston rod presses the pressure sensor downward, the pressure sensor transmits a data signal to the control chip, the control chip transmits the signal to the single-chip microcomputer, the single-chip microcomputer controls the solenoid valve to open, and the nitrogen tank transmits the nitrogen through the bent pipe to the first threaded connecting pipe, and then enters the nitrogen sealing chamber through the air inlet pipe to achieve nitrogen sealing, using nitrogen as a protective gas to prevent the piston rod from sinking.

[0019] The present invention has the following beneficial effects:

[0020] 1. In the optimization method for protecting the piston rod of a hydrogen compressor according to the present invention, a hydrogen sealing chamber and a nitrogen sealing chamber are sequentially arranged between a cylinder body and a crankcase of the hydrogen compressor, and a piston rod is arranged at the center of the cylinder body, the hydrogen sealing chamber and the nitrogen sealing chamber. Next, a pressure sensor is arranged at the lower end of the hydrogen sealing chamber, and then an air intake pipe is arranged through the upper end of the nitrogen sealing chamber, a first threaded connecting pipe is arranged at one end of the air intake pipe, a bend is connected to the other end of the first threaded connecting pipe, and a nitrogen tank is connected to the other end of the bend; then, a pressure sensor for controlling the nitrogen tank is arranged at one end of the bend near the nitrogen tank. Whether to flush nitrogen into the solenoid valve in the nitrogen sealing chamber, and finally set a control module on the crankcase, the pressure sensor and the solenoid valve are electrically connected to the control module, as long as the piston rod sinks, the piston rod will press down the pressure sensor, the solenoid valve opens, and the nitrogen tank flushes nitrogen into the nitrogen sealing chamber through a series of pipes to achieve nitrogen sealing, and nitrogen is used as a protective gas to prevent the piston rod from sinking. When the piston rod stops sinking, the solenoid valve automatically closes and no longer flushes nitrogen into it, making the equipment more intelligent, more responsive, and more effective.

[0021] 2. The present invention sets up a nitrogen sealing chamber and uses nitrogen as a protective gas to prevent the piston rod from sinking, replacing the original air as the protective gas, avoiding explosion caused by contact between air and hydrogen, thereby optimizing the hydrogen compressor piston rod sinking protection method, making the hydrogen compressor safer to use, increasing the service life of the equipment, and enhancing the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 This is a flow chart of an optimization method for protecting the piston rod of a hydrogen compressor according to the present invention;

[0024] Figure 2 It is a schematic diagram of the overall structure of a hydrogen compressor in an optimization method for protecting the piston rod of a hydrogen compressor according to the present invention;

[0025] Figure 3 It is a schematic diagram of the top view structure of a hydrogen compressor in an optimization method for protecting the piston rod of a hydrogen compressor according to the present invention;

[0026] Figure 4 For the present invention Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0027] Figure 5 For the present invention Figure 2 A schematic diagram of the local enlarged structure at B in the middle;

[0028] Figure 6 For the present invention Figure 2 A schematic diagram of the local enlarged structure at C in the middle;

[0029] Figure 7 For the present invention Figure 2 A schematic diagram of the local enlarged structure at D in the middle;

[0030] Figure 8 For the present invention Figure 2 A schematic diagram of the local enlarged structure at E in the middle;

[0031] Fig. 9 For the present invention Figure 4 Schematic diagram of the local enlarged structure at F in the middle.

[0032] In the figure: 1. cylinder block; 2. crankcase; 3. hydrogen sealing chamber; 4. nitrogen sealing chamber; 5. pressure sensor; 6. intake pipe; 7. first threaded connecting pipe; 8. elbow; 9. nitrogen tank; 10. solenoid valve; 11. control module; 12. piston rod; 13. push block; 14. piston block; 15. hydrogen pipe; 16. exhaust pipe; 17. second threaded connecting pipe; 18. first valve; 19. pressing block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", "all around" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] See also Figure 1-9 As shown, the present invention is an optimization method for protecting the piston rod of a hydrogen compressor from sinking, comprising the following steps:

[0036] Step 1, a hydrogen sealing chamber 3 and a nitrogen sealing chamber 4 are sequentially arranged between a cylinder body 1 and a crankcase 2 of a hydrogen compressor, and a piston rod 12 is arranged at the center of the cylinder body 1, the hydrogen sealing chamber 3 and the nitrogen sealing chamber 4;

[0037] Step 2: a pressure sensor 5 is arranged at the lower end of the hydrogen sealed chamber 3;

[0038] Step 3, an air inlet pipe 6 is provided through the upper end of the nitrogen sealing chamber 4, a first threaded connecting pipe 7 is provided at one end of the air inlet pipe 6, a bend pipe 8 is connected to the other end of the first threaded connecting pipe 7, and a nitrogen tank 9 is connected to the other end of the bend pipe 8;

[0039] Step 4, a solenoid valve 10 is provided at one end of the bent pipe 8 close to the nitrogen tank 9 to control whether the nitrogen tank 9 flushes nitrogen into the nitrogen sealing chamber 4;

[0040] Step 5, a control module 11 is set on the crankcase 2, and the pressure sensor 5 and the solenoid valve 10 are electrically connected to the control module 11. When the piston rod 12 sinks, the lower part of the piston rod 12 presses downward on the pressure sensor 5, and the pressure sensor 5 transmits a signal to the control module 11. The control module 11 controls the solenoid valve 10 to open, and the nitrogen tank 9 flushes nitrogen into the nitrogen sealing chamber 4 to prevent the piston rod 12 from sinking.

[0041] Among them, one end of the hydrogen sealing chamber 3 is fixedly connected to the side wall of the cylinder body 1 by screws, the other end of the hydrogen sealing chamber 3 is fixedly connected to one end of the nitrogen sealing chamber 4 by screws, and the other end of the nitrogen sealing chamber 4 is fixedly connected to the side wall of the crankcase 2 by screws. The hydrogen sealing chamber 3 and the nitrogen sealing chamber 4 have the same height. The screw connection makes the connection between the cylinder body 1, the hydrogen sealing chamber 3, the nitrogen sealing chamber 4 and the crankcase 2 tighter, and rubber sealing rings are arranged between the joints to improve the sealing effect of the equipment.

[0042] Among them, the hydrogen sealing chamber 3 and the nitrogen sealing chamber 4 are hollow inside, and the piston rod 12 is driven to reciprocate by the driving motor and the connecting rod provided inside the crankcase 2, and then the piston rod 12 reciprocates inside the hydrogen sealing chamber 3 and the nitrogen sealing chamber 4, and the piston rod 12 reciprocates inside the cylinder body 1, the hydrogen sealing chamber 3, and the nitrogen sealing chamber 4.

[0043] Among them, a circular through hole is provided at one end of the cylinder body 1, and the circular through hole is located on the extension line of the central axis of the hydrogen sealing chamber 3. One end of the piston rod 12 passes through the circular through hole, and a pushing block 13 is fixedly arranged. The pushing block 13 is provided with a piston block 14 at the end away from the piston rod 12. The diameter of the piston block 14 is adapted to the diameter of the inner wall of the cylinder body 1. The piston rod 12 slides back and forth on the inner wall of the circular through hole, thereby driving the pushing block 13 to move and finally driving the piston block 14 to reciprocate on the inner wall of the cylinder body 1.

[0044] Among them, a hydrogen pipe 15 is connected to the upper end of the hydrogen sealed chamber 3, and an exhaust pipe 16 is connected to the lower end of the hydrogen sealed chamber 3. The hydrogen pipe 15 and the exhaust pipe 16 are symmetrically distributed about the central axis of the hydrogen sealed chamber 3. A second threaded connecting pipe 17 is provided at the upper end of the hydrogen pipe 15 and the lower end of the exhaust pipe 16. A first valve 18 is provided on the hydrogen pipe 15 and the exhaust pipe 16. The first valve 18 on the hydrogen pipe 15 and the exhaust pipe 16 respectively controls whether the hydrogen pipe 15 and the exhaust pipe 16 are flowing.

[0045] Among them, the pressure sensor 5 is located directly below the piston rod 12, and a pressing block 19 is provided at the upper end of the pressure sensor 5. An arc-shaped groove is provided on the upper surface of the pressing block 19, and the arc-shaped groove is adapted to the outer wall of the piston rod 12. When the piston rod 12 sinks, the pressing block 19 with an arc-shaped groove on the upper surface is pressed downward, and the pressing block 19 presses down the pressure sensor 5.

[0046] Among them, the control module 11 is equipped with a control chip and a single-chip microcomputer. When the piston rod 12 presses the pressure sensor 5 downward, the pressure sensor 5 transmits the data signal to the control chip, the control chip transmits the signal to the single-chip microcomputer, the single-chip microcomputer controls the solenoid valve 10 to open, and the nitrogen tank 9 transmits the nitrogen through the bent pipe 8 to the first threaded connecting pipe 7, and then enters the nitrogen sealing chamber 4 through the air inlet pipe 6 to achieve nitrogen sealing, and uses nitrogen as a protective gas to prevent the piston rod 12 from sinking.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An optimization method for protecting the piston rod of a hydrogen compressor from sinking, characterized in that: The hydrogen compressor comprises a hydrogen sealing chamber (3), one end of the hydrogen sealing chamber (3) being fixedly connected to the side wall of the cylinder body (1) by means of screws, the other end of the hydrogen sealing chamber (3) being fixedly connected to one end of the nitrogen sealing chamber (4) by means of screws, the other end of the nitrogen sealing chamber (4) being fixedly connected to the side wall of the crankcase (2) by means of screws, and the hydrogen sealing chamber (3) and the nitrogen sealing chamber (4) being of the same height; The hydrogen sealing chamber (3) and the nitrogen sealing chamber (4) are hollow inside, and the piston rod (12) is driven to reciprocate by a driving motor and a connecting rod provided inside the crankcase (2), so that the piston rod (12) reciprocates inside the hydrogen sealing chamber (3) and the nitrogen sealing chamber (4); A circular through hole is provided at one end of the cylinder body (1), and the circular through hole is located on the extension line of the central axis of the hydrogen sealing chamber (3); one end of the piston rod (12) passes through the circular through hole and is fixedly provided with a push block (13); a piston block (14) is provided at the end of the push block (13) away from the piston rod (12); the diameter of the piston block (14) is mutually adapted to the diameter of the inner wall of the cylinder body (1); The optimization method for hydrogen compressor piston rod sinking protection comprises the following steps: Step 1: a hydrogen sealing chamber (3) and a nitrogen sealing chamber (4) are sequentially arranged between a cylinder body (1) and a crankcase (2) of a hydrogen compressor, wherein a piston rod (12) is arranged at the center of the cylinder body (1), the hydrogen sealing chamber (3) and the nitrogen sealing chamber (4); Step 2: arranging a pressure sensor (5) at the lower end of the hydrogen sealing chamber (3); Step 3, an air inlet pipe (6) is provided through the upper end of the nitrogen sealing chamber (4), a first threaded connecting pipe (7) is provided at one end of the air inlet pipe (6), the other end of the first threaded connecting pipe (7) is connected to a bent pipe (8), and the other end of the bent pipe (8) is connected to a nitrogen tank (9); Step 4, a solenoid valve (10) is provided at one end of the curved pipe (8) close to the nitrogen tank (9) to control whether the nitrogen tank (9) flushes nitrogen into the nitrogen sealing chamber (4); Step 5: a control module (11) is arranged on the crankcase (2); the pressure sensor (5) and the solenoid valve (10) are both electrically connected to the control module (11); when the piston rod (12) sinks, the lower part of the piston rod (12) presses the pressure sensor (5) downward, and the pressure sensor (5) transmits a signal to the control module (11); the control module (11) controls the solenoid valve (10) to open, and the nitrogen tank (9) flushes nitrogen into the nitrogen sealing chamber (4) to prevent the piston rod (12) from sinking.

2. The optimization method for protecting the piston rod of a hydrogen compressor from sinking according to claim 1, characterized in that: The upper end of the hydrogen sealed chamber (3) is connected to a hydrogen pipe (15), and the lower end of the hydrogen sealed chamber (3) is connected to an exhaust pipe (16). The hydrogen pipe (15) and the exhaust pipe (16) are symmetrically distributed about the central axis of the hydrogen sealed chamber (3). The upper end of the hydrogen pipe (15) and the lower end of the exhaust pipe (16) are both provided with a second threaded connecting pipe (17). The hydrogen pipe (15) and the exhaust pipe (16) are both provided with a first valve (18).

3. The optimization method for protecting the piston rod of a hydrogen compressor from sinking according to claim 1, characterized in that: The pressure sensor (5) is located directly below the piston rod (12), and a pressing block (19) is provided at the upper end of the pressure sensor (5). An arc-shaped groove is provided on the upper surface of the pressing block (19), and the arc-shaped groove is adapted to fit the outer wall of the piston rod (12).

4. The optimization method for protecting the piston rod of a hydrogen compressor from sinking according to claim 1, characterized in that: The control module (11) is internally provided with a control chip and a single-chip microcomputer.

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