A multi-stage compressor for hydrogen refueling stations

Abstract

The present application provides a multi-stage compressor for a hydrogen refueling station, which includes a cylinder, a piston rod, a piston, and a power unit. A sealing assembly is provided between the inner wall of the cylinder and the piston. The sealing assembly includes a spiral sealing strip and rubber blocks arranged side by side on both sides of the sealing strip. The rubber blocks arranged on both sides of the sealing strip are staggered. Fixed openings are respectively opened on both sides of the cylinder. The widths of the two fixed openings are equal to the widths of the rubber blocks. The front and rear ends of the sealing strip pass through the fixed openings and exit the cylinder. The portion of the sealing strip inside the cylinder has a spiral structure. The side of the sealing strip away from the cylinder is in close contact with the outer wall of the piston, and the side of the sealing strip close to the cylinder is in close contact with the wall of the cylinder cavity. The present application can effectively block external debris, reduce the situation where external debris enters the interior of the compressor, reduce the adverse effects of external debris on the purity of hydrogen, and reduce safety hazards in the subsequent use of the hydrogen refueling station.

Description

Technical Field

[0001] The present application relates to the technical field of compression equipment, and in particular to a multi-stage compressor for a hydrogen refueling station. Background Art

[0002] Hydrogen is one of the commonly used environmentally friendly energy sources. In order to facilitate the storage and transportation of hydrogen, people often compress hydrogen through compressors. During the process of compressing hydrogen in the compressor, due to the high pressure inside the compressor, the gas is prone to leakage, and the sealing requirements of the compressor are high to ensure the gas purity of the hydrogen after compression.

[0003] In existing hydrogen refueling stations, the compressors used to compress hydrogen usually only use simple sealing rings to block external debris. During long-term use, external debris can still easily enter the interior of the compressor, thereby affecting the purity of the hydrogen after compression. If the hydrogen refueling station subsequently uses this low-purity hydrogen, there will be a major safety hazard. Summary of the Invention

[0004] Based on this, in order to solve the problem of greater safety hazards, the embodiment of the present application provides a multi-stage compressor for a hydrogen refueling station, and its specific technical solution is as follows:

[0005] A multi-stage compressor for a hydrogen refueling station comprises a cylinder, a piston rod, a piston and a power device, a sealing assembly is provided between the inner wall of the cylinder and the piston, the sealing assembly comprises a spiral sealing strip and rubber blocks arranged side by side on both sides of the sealing strip, the rubber blocks arranged on both sides of the sealing strip are staggered, fixed openings are respectively provided on both sides of the cylinder, the width of the two fixed openings is equal to the width of the rubber blocks, and the length of the two fixed openings is equal to the total length of the rubber blocks arranged side by side, the head and tail ends of the sealing strip pass through the fixed openings and pass out of the cylinder, the part of the sealing strip in the cylinder has a spiral structure, the side of the sealing strip away from the cylinder is in close contact with the outer wall of the piston, and the side of the sealing strip close to the cylinder is in close contact with the wall of the cylinder inner cavity, the power device is used to apply tension to one end of the sealing strip, and a spring strip is provided in the sealing strip.

[0006] Compared with the prior art, the beneficial effects are: the rubber blocks on both sides of the sealing strip are staggered, which can fill the gap when the sealing strip is in a spiral structure, and the power device can pull one end of the sealing strip, and under the traction of the spring bar, drive the sealing strip to rotate, thereby maintaining the tightness of the sealing strip when it is in a spiral structure, improving the sealing between the cylinder and the piston, effectively blocking foreign matter, reducing the entry of foreign matter into the compressor, and reducing hydrogen gas leakage, reducing the adverse effects of foreign matter entering the compressor on the purity of hydrogen, thereby greatly reducing safety hazards.

[0007] Furthermore, a plurality of plug-in pieces are arranged side by side on the outer side of the spring bar, and the plurality of plug-in pieces correspond to the rubber blocks one by one and are respectively embedded in the rubber blocks.

[0008] Furthermore, the spiral diameter of the spring strip in a natural state is larger than the inner diameter of the cylinder.

[0009] Furthermore, the direction in which the sealing strip passes through the cylinder is parallel to the tangential direction of the cylinder side wall.

[0010] Furthermore, the cylinder includes a primary cylinder and a secondary cylinder, the secondary cylinder is used to re-compress the compressed object after being compressed by the primary cylinder, and the primary cylinder and the secondary cylinder share the same sealing strip.

[0011] Furthermore, a cooling cylinder is installed on the outside of the cylinder, and a cooling cylinder is installed on the outside of the cylinder. A water inlet pipe and a water outlet pipe are respectively provided on both sides of the cooling cylinder. The axial direction of the water inlet pipe and the axial direction of the water outlet pipe are both perpendicular to the axial direction of the fixed opening; a guide support plate is provided on the side of the cooling cylinder close to the cylinder.

[0012] Furthermore, the guide support plate includes a parallel section located in the middle of the cooling cylinder and diversion sections located at the left and right ends of the parallel section. The diversion section is arranged around the water inlet pipe or the water outlet pipe distributed on the cooling cylinder away from one end of the parallel section.

[0013] Furthermore, an inner groove is formed on the inner side of the cylinder, and the sealing strip is partially embedded in the inner groove.

[0014] Furthermore, the width of the sealing strip is less than or equal to the width of the rubber block.

[0015] Furthermore, the power device includes a telescopic cylinder and a motor, the motor is installed at the output end of the telescopic cylinder, a winding drum is installed at the output end of the motor, and one end of the sealing strip is wound around the outside of the winding drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The embodiments of the present application can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but rather the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0017] Figure 1 is a schematic cross-sectional view of the interior of a cylinder provided in one embodiment of the present application;

[0018] Figure 2 This is a schematic structural diagram of a plug-in connector provided in one embodiment of the present application;

[0019] Figure 3 This is a structural diagram of a guide support plate provided in one embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of the distribution shape of the guide support plates provided in one embodiment of the present application.

[0021] Description of reference numerals:

[0022] 1-cylinder; 10-inner groove; 2-piston rod; 3-piston; 4-sealing strip; 40-rubber block; 5-spring bar; 50-connector; 6-cooling cylinder; 60-water inlet pipe; 61-water outlet pipe; 62-guide support plate; 621-parallel section; 622-diverter section. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The "first" and "second" in the present invention do not represent specific quantities and orders, but are only used to distinguish names.

[0027] like Figure 1-4As shown, a multi-stage compressor for a hydrogen refueling station in one embodiment of the present application includes a cylinder 1, a piston rod 2, a piston 3, and a power unit. The piston 3 is mounted in the piston rod 2. Driven by a driving device (e.g., a hydraulic cylinder), the piston rod 2 can drive the piston 3 to move back and forth within the cylinder 1, thereby compressing the gas (e.g., hydrogen) in the cylinder 1. Cylinder 1 is also provided with a compressed gas inlet and outlet to achieve gas compression.

[0028] Generally, a sealing ring with a simple structure is sleeved on the outer side of the piston 3. However, the sealing ring with a simple structure is often worn during the reciprocating motion of the piston 3, and the sealing ring is easily aged, which leads to poor sealing effect. Therefore, the present application provides a sealing assembly between the inner wall of the cylinder 1 and the piston 3, and the sealing assembly includes a sealing strip 4, the part of the sealing strip 4 in the cylinder 1 is a spiral structure, and the above-mentioned power device is used to provide tension to one end of the sealing strip 4; the sealing strip 4 is made of a rubber material that can undergo elastic deformation, and the side of the sealing strip 4 away from the cylinder 1 is in close contact with the outer wall of the piston 3, and the side of the sealing strip 4 close to the cylinder 1 is in close contact with the inner cavity wall of the cylinder 1, so that the piston 3 is always blocked from external debris by the sealing strip 4 during the reciprocating motion.

[0029] like Figure 1 As shown, a spring strip 5 is disposed within the sealing strip 4. This spring strip 5 maintains the sealing strip 4 in its spiral structure and supports it within the cylinder 1. It should be noted that the spiral diameter of the spring strip 5 in its natural state is larger than the inner diameter of the cylinder 1. An inner groove 10 is defined within the cylinder 1. The horizontal cross-section of the inner groove 10 is circular, and the spiral portion of the sealing strip 4 is embedded within the inner groove 10. The depth of the inner groove 10 is less than half the width of the sealing strip 4.

[0030] like Figure 1 and Figure 2 As shown, the sealing assembly also includes rubber blocks 40 arranged side by side on both sides of the sealing strip 4, and the rubber blocks 40 arranged on both sides of the sealing strip 4 are staggered. At the same time, the present application also provides fixed openings on both sides of the cylinder 1. The widths of the two fixed openings are equal to the width of the rubber blocks 40, and the lengths of the two fixed openings are equal to the total length of the rubber blocks 40 arranged side by side, so that the leading and trailing ends of the sealing strip 4 can pass through the fixed openings and out of the cylinder 1. The direction in which the sealing strip 4 passes through the cylinder 1 is parallel to the tangential direction of the side wall of the cylinder 1. The distance between the two rubber blocks 40 on the same side is less than or equal to the thickness of the rubber block 40, and the width of the sealing strip 4 is less than or equal to the width of the rubber block 40, thereby ensuring the sealing between the two rubber blocks 40 that are embedded in each other.

[0031] The power unit includes a telescopic cylinder, a motor, and a bobbin. The telescopic cylinder is mounted on the outer shell of the cylinder 1, and its telescopic direction is parallel to that of the piston rod 2. The motor is mounted on the output end of the telescopic cylinder, and the axial end of the bobbin is mounted on the output end of the motor, with the axial direction of the bobbin parallel to the telescopic direction of the piston rod 2. The end of the sealing strip 4 that is pulled out is fixed and wound around the outside of the bobbin. The motor drives the bobbin to rotate, thereby pulling the sealing strip 4. Since the sealing strip 4 is continuously wound around the bobbin, the telescopic cylinder can adjust the position of the motor and bobbin by pushing them, so that the sealing strip 4 at the fixed opening is always pulled in the same horizontal plane. That is, the sealing strip 4 remains horizontal when pulled out of the fixed opening, reducing the possibility of the sealing strip 4 on the bobbin constantly accumulating on the same horizontal plane and the possibility of the sealing strip 4 colliding with the fixed opening.

[0032] After the sealing strip 4 has been used for a period of time, the user can connect a new sealing strip 4 to the end of the sealing strip 4 away from the power unit, and then start the power unit to completely pull out the old sealing strip 4, and the new sealing strip 4 can be added in, thereby replacing the sealing strip 4 and ensuring that the sealing strip 4 in the cylinder 1 still has good sealing performance during long-term use, so that during the long-term use of the compressor, it can still better prevent foreign debris from entering the interior of the compressor.

[0033] like Figure 1 and Figure 2 As shown, to reduce relative sliding between the spring strip 5 and the sealing strip 4 and mitigate the adverse effects of relative sliding on the structure and performance of the sealing strip 4, multiple plug-in pieces 50 are arranged side by side on the outer side of the spring strip 5. Each plug-in piece 50 corresponds to a rubber block 40 and is embedded in the corresponding rubber block 40. The plug-in piece 50 is smaller than the rubber block 40 and is made of an elastically deformable material, such as rubber. In addition, the plug-in piece 50 can support the rubber block 40, so that two rubber blocks 40 that need to be interlocked can be inserted into each other.

[0034] In one embodiment, the cylinder 1 includes a primary cylinder and a secondary cylinder. The pressure of the compressed gas in the primary cylinder is lower than the pressure of the compressed gas in the secondary cylinder. After the gas object to be compressed is compressed by the primary cylinder, it enters the secondary cylinder and is compressed again. Among them, a sealing strip 4, a rubber block 40 and a spring strip 5 are installed in both the primary cylinder and the secondary cylinder. The primary cylinder and the secondary cylinder share the same sealing strip, that is, the sealing strip 4 pulled out from the secondary cylinder can enter the primary cylinder for reuse, thereby realizing multiple uses of the sealing strip 4 and improving the utilization rate of the sealing strip 4; the used sealing strip 4 can also be recycled and processed into products such as sealing rings with ordinary sealing performance, which is conducive to achieving environmental protection and energy saving effects.

[0035] In one embodiment, Figure 3 and Figure 4 As shown, a cooling cylinder 6 is sealed and mounted on the outside of the cylinder 1. The cooling cylinder 6 is used to cool the cylinder 1. A water inlet pipe 60 and a water outlet pipe 61 are provided on both sides of the cooling cylinder 6. The water inlet pipe 60 and the water outlet pipe 61 are used to supply and discharge coolant. The axis direction of the water inlet pipe and the axis direction of the water outlet pipe are both perpendicular to the axis direction of the fixed opening. Cooling water enters through the water inlet pipe 60 and is discharged through the water outlet pipe 61.

[0036] At the same time, a guide support plate 62 is provided on the inner wall of the cooling tube 6 near the cylinder 1. The inner side of the guide support plate 62 is fixedly connected to the outer wall of the cylinder 1, and the outer side of the guide support plate 62 is fixedly connected to the inner wall of the cooling tube 6. The guide support plate 62 can support the outer wall of the cylinder 1, reducing the serious deformation of the cylinder 1 due to high temperature. At the same time, the guide support plate 62 can divert the coolant, improve the cooling effect of the coolant, and improve the cooling balance.

[0037] In one embodiment, Figure 3 and Figure 4 As shown, the guide support plate 62 includes a parallel section 621 and a diverter section 622. The parallel section 621 is located in the middle of the cooling cylinder, and the diverter sections 622 are located at the left and right ends of the parallel section 621. The diverter sections 622 are arranged around one end away from the parallel section 621 and distributed at the corresponding water inlet pipe 60 or water outlet pipe 61 of the cooling cylinder 6. The diverter section 622 can divert and guide the coolant entering the cooling cylinder 6, thereby significantly improving the cooling effect of the cooling cylinder 6 on the cylinder 1.

[0038] The implementation principle of the multi-stage compressor for the hydrogen filling station in the embodiment of the present application is as follows: when the piston rod 2 is started, the spiral sealing strip 4 rotates synchronously, and the spring strip 5 is driven, and the rubber blocks 40 in the spiral sealing strip 4 are tightly engaged with each other. Since the side of the sealing strip 4 away from the cylinder 1 is close to the outer wall of the piston 3, and the side of the sealing strip 4 close to the cylinder 1 is close to the cavity wall of the inner cavity of the cylinder 1, it can better reduce the situation where foreign matter enters the interior of the compressor and reduce subsequent safety hazards. At the same time, the motor outside the cylinder 1 can drive the winding drum to rotate through the output end, so that the sealing strip 4 coming out of the fixed port can be wound up by the winding drum. When the winding drum winds up the sealing strip 4, the telescopic rod can adjust the position of the motor and the winding drum, thereby improving the use effect of the sealing strip 4.

[0039] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A multi-stage compressor for a hydrogen refueling station, characterized in that: The invention comprises a cylinder (1), a piston rod (2), a piston (3) and a power device, wherein a sealing assembly is provided between the inner wall of the cylinder (1) and the piston (3), wherein the sealing assembly comprises a spiral sealing strip (4) and rubber blocks (40) arranged side by side on both sides of the sealing strip (4), wherein the rubber blocks (40) arranged on both sides of the sealing strip (4) are arranged in a staggered manner, and fixed openings are respectively provided on both sides of the cylinder (1), wherein the width of the two fixed openings is equal to the width of the rubber blocks (40), and the length of the two fixed openings is equal to The total length of the rubber blocks (40) arranged side by side, the leading and trailing ends of the sealing strip (4) pass through the fixed opening and exit the cylinder (1), the portion of the sealing strip (4) in the cylinder (1) is in a spiral structure, the side of the sealing strip (4) away from the cylinder (1) is in close contact with the outer wall of the piston (3), and the side of the sealing strip (4) close to the cylinder (1) is in close contact with the wall of the inner cavity of the cylinder (1), the power device is used to apply tension to one end of the sealing strip (4), and a spring strip (5) is provided in the sealing strip (4); The power device comprises a telescopic cylinder and a motor, the motor is mounted on the output end of the telescopic cylinder, a winding drum is mounted on the output end of the motor, and one end of the sealing strip (4) is wound around the outside of the winding drum.

2. The multi-stage compressor for hydrogen refueling station according to claim 1, characterized in that: A plurality of plug-in sheets (50) are arranged side by side on the outer side of the spring strip (5); the plurality of plug-in sheets (50) correspond to the rubber blocks (40) one by one and are respectively embedded in the rubber blocks (40).

3. The multi-stage compressor for hydrogen refueling station according to claim 1, characterized in that: The spiral diameter of the spring strip (5) in a natural state is larger than the inner diameter of the cylinder (1).

4. The multi-stage compressor for hydrogen refueling station according to claim 1, characterized in that: The direction in which the sealing strip (4) passes through the cylinder (1) is parallel to the tangential direction of the side wall of the cylinder (1).

5. The multi-stage compressor for hydrogen refueling station according to claim 1, characterized in that: The cylinder (1) comprises a primary cylinder and a secondary cylinder, wherein the secondary cylinder is used to re-compress the compressed object after being compressed by the primary cylinder, and the primary cylinder and the secondary cylinder share the same sealing strip (4).

6. The multi-stage compressor for hydrogen refueling station according to claim 1, characterized in that: A cooling cylinder (6) is installed on the outside of the cylinder (1), and a water inlet pipe (60) and a water outlet pipe (61) are respectively provided on both sides of the cooling cylinder (6), and the axial direction of the water inlet pipe (60) and the axial direction of the water outlet pipe (61) are both perpendicular to the axial direction of the fixed opening; a guide support plate (62) is provided on the side of the cooling cylinder (6) close to the cylinder (1).

7. The multi-stage compressor for hydrogen refueling station according to claim 6, characterized in that: The guide support plate (62) includes a parallel section (621) located in the middle of the cooling cylinder (6) and diversion sections (622) located at the left and right ends of the parallel section (621). The diversion section (622) is arranged around one end away from the parallel section (621) and distributed on the water inlet pipe (60) or the water outlet pipe (61) on the cooling cylinder (6).

8. The multi-stage compressor for hydrogen refueling station according to claim 1, characterized in that: An inner groove (10) is provided on the inner side of the cylinder (1), and a portion of the sealing strip (4) is embedded in the inner groove (10).

9. The multi-stage compressor for hydrogen refueling station according to claim 1, characterized in that: The width of the sealing strip (4) is less than or equal to the width of the rubber block (40).

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