Compressor based on planetary gear transmission

Abstract

The compressor based on planetary gear transmission comprises a planetary gear transmission assembly and a plunger compression assembly, the plunger compression assembly is provided with a pump body, a plunger cavity is formed in the pump body, a piston push rod is slidably connected into the plunger cavity, and the planetary gear transmission assembly is hinged to the piston push rod. The planetary gear transmission assembly rotates to drive the piston push rod to do linear reciprocating motion in the plunger cavity. According to the invention, the planetary gear transmission assembly is arranged, and the rotary motion of the planetary gear transmission assembly is directly, efficiently and smoothly converted into the pure linear reciprocating motion of the piston push rod by utilizing the hinged connection of the planetary gear transmission assembly and the piston push rod, so that the gas in the plunger cavity is periodically compressed. The invention belongs to the technical field of gas compressors.

Description

Technical Field

[0001] This invention belongs to the field of gas compressor technology, specifically relating to a compressor based on planetary gear transmission. Background Technology

[0002] Hydrogen compression is a key link in the hydrogen energy industry. As the core equipment for hydrogen compression, the performance of the transmission structure of the gas compressor directly affects the compression efficiency and stability.

[0003] In existing gas compressors, the transmission structure of the plunger pump generally adopts a crank-connecting rod mechanism or a cam mechanism. The crank-connecting rod mechanism converts the rotational motion of the crank into the linear reciprocating motion of the plunger, but it suffers from low transmission efficiency (approximately 70%-80%), large motion runout (prone to vibration and noise), and poor self-locking performance (difficult to withstand reverse loads). Furthermore, multi-stage transmissions involve complex structures, with each component independently set up, resulting in a large space occupation and making it difficult to achieve the matching of "step-by-step force increase" and "step-by-step pressure increase". Although the cam mechanism can achieve specific motion laws (such as sine curves) through the cam profile, it has a complex structure, requires high machining precision, and is costly. Moreover, multi-stage transmissions require multiple cams to cooperate, which is not conducive to compact design.

[0004] Therefore, there is an urgent need to design a gas compressor with a compact structure, high transmission efficiency, low motion vibration, and high self-locking strength. Summary of the Invention

[0005] The purpose of this invention is to provide a compressor based on planetary gear transmission, which aims to solve the technical problems of low transmission efficiency, large motion runout, poor self-locking performance, and complex structure of the piston pump transmission structure in existing gas compressors.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a compressor based on planetary gear transmission is provided, including a planetary gear transmission assembly and a plunger compression assembly. The plunger compression assembly is provided with a pump body, and the pump body is provided with a plunger cavity. A piston push rod is slidably connected in the plunger cavity. The planetary gear transmission assembly is hinged to the piston push rod. The rotation of the planetary gear transmission assembly drives the piston push rod to perform linear reciprocating motion in the plunger cavity.

[0007] In one embodiment, the planetary gear transmission assembly includes a gear ring, a driving gear rotatably connected within the gear ring, and a first driven gear rotatably connected within the gear ring, the first driven gear meshing with the driving gear; a second driven gear is also provided above the first driven gear, coaxially arranged with the first driven gear, the second driven gear meshing with the gear ring; a planetary gear is provided on the second driven gear, and the piston push rod is hinged to the planetary gear.

[0008] In one embodiment, the piston push rod and the planetary gear are hinged by a column hinge, a ball hinge, or a universal joint hinge.

[0009] In one embodiment, when the piston push rod and the planetary gear are hinged in a column hinge manner, the planetary gear is provided with a pin bearing, the pin bearing is offset from the axis of the planetary gear, the piston push rod is provided with a through hole, the pin bearing is located in the through hole and rotatably connected to the through hole, and the piston push rod is hinged to the planetary gear through the pin bearing.

[0010] In one embodiment, the pin bearing passes through the through hole and extends to the outside of the through hole, and the pin bearing is provided with a fixing member located above the piston push rod.

[0011] In one embodiment, a power drive assembly is further included, the power drive assembly including a prime mover, the shaft of the prime mover passing through the gear ring and extending into the gear ring, and the drive gear being disposed on the shaft of the prime mover.

[0012] In one embodiment, the number of planetary gear transmission components is multi-stage, and all stages of the planetary gear transmission components are disposed within the gear ring. Each stage of the planetary gear transmission components meshes sequentially to achieve multi-stage speed reduction and power amplification.

[0013] In one embodiment, there are multiple plunger cavities, which are evenly distributed along the circumference of the gear ring. The multi-stage planetary gear transmission assembly corresponds to and cooperates with the multiple plunger cavities to achieve step-by-step pressurization.

[0014] In one embodiment, the pump body and the gear ring are separate structures.

[0015] In one embodiment, the pump body and the gear ring are an integral structure.

[0016] This invention provides a compressor based on planetary gear transmission, which has the following advantages compared with the prior art: (1) By setting up a planetary gear transmission assembly and using the hinged connection between the planetary gear transmission assembly and the piston push rod, the rotational motion of the planetary gear transmission assembly is directly, efficiently and smoothly converted into the pure linear reciprocating motion of the piston push rod, thereby realizing the periodic compression of the gas in the plunger cavity.

[0017] (2) The present invention uses a planetary gear transmission assembly enclosed in a gear ring for transmission and motion conversion. The transmission chain is short and the meshing efficiency is high. The entire transmission and compression module is highly integrated, eliminating the large lateral space required by the traditional crank-connecting rod mechanism. This achieves extremely high power density and space utilization, making the structure exceptionally compact. It is particularly suitable for space-constrained applications (such as vehicle-mounted hydrogen systems). In addition, the gear meshing transmission has a high contact ratio and load-sharing characteristics, and its load-bearing capacity is much higher than that of the articulated connecting rod mechanism. It also has extremely high self-locking strength and overload capacity, ensuring the stability and reliability of operation under high-pressure conditions.

[0018] (3) The conversion process of the present invention is smooth, and the motion law of the piston push rod is a sine curve or a quasi-sine curve, which makes the speed and acceleration of the piston push rod change continuously without sudden changes, fundamentally and significantly reducing the inertial impact force and vibration intensity during operation, reducing noise, and significantly extending the service life of moving parts such as the piston push rod.

[0019] (4) By setting up a multi-stage planetary gear transmission assembly with sequential meshing in the same gear ring space, the present invention can realize the step-by-step deceleration and torque amplification of rotational power; when the power output of each stage drives the corresponding series-connected plunger chambers, the step-by-step pressurization of gas can be achieved efficiently.

[0020] (5) The structure of the present invention is reversible and can be used to generate electricity. By reducing the pressure of hydrogen, the piston push rod is driven to make linear reciprocating motion, which drives the planetary gear transmission assembly to increase speed in the opposite direction, and finally drives the generator to generate electricity, realizing the efficient recovery of pressure energy. Its multi-stage pressure reduction process and multi-stage speed increase transmission are perfectly matched, resulting in high efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of a compressor based on planetary gear transmission provided in an embodiment of this application; Figure 2 for Figure 1 The diagram shows a compressor based on planetary gear transmission from another angle. Figure 3 for Figure 1 The diagram shows a cross-sectional structure of a compressor based on planetary gear transmission. Figure 4 for Figure 1The diagram shows a cross-sectional view of a compressor based on planetary gear transmission from another angle.

[0023] Explanation of symbols in the diagram: 1. Planetary gear transmission assembly; 101. Gear ring; 102. Driving gear; 103. First driven gear; 104. Second driven gear; 105. Planetary gear; 106. Pin bearing; 107. Fixing component; 2. Plunger compression assembly; 201. Pump body; 202. Plunger chamber; 203. Piston push rod; 204. Through hole; 3. Power drive components; 301. Prime mover. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed" or "set" to another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to that other component.

[0026] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and should not be construed as indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Please see Figure 1 This is a schematic diagram of a compressor based on planetary gear transmission according to an embodiment of this application. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows: In one embodiment, please refer to Figures 2-4A compressor based on planetary gear transmission includes a planetary gear transmission assembly 1 and a plunger compression assembly 2. The plunger compression assembly 2 is provided with a pump body 201, and a plunger cavity 202 is provided inside the pump body 201. A piston push rod 203 is slidably connected inside the plunger cavity 202. The planetary gear transmission assembly 1 is hinged to the piston push rod 203. The rotation of the planetary gear transmission assembly 1 drives the piston push rod 203 to perform linear reciprocating motion inside the plunger cavity 202.

[0028] The present invention, by setting up a planetary gear transmission assembly 1 and utilizing the hinged connection between the planetary gear transmission assembly 1 and the piston push rod 203, directly, efficiently and smoothly converts the rotational motion of the planetary gear transmission assembly 1 into the pure linear reciprocating motion of the piston push rod 203, thereby realizing the periodic compression of the gas in the plunger cavity 202.

[0029] For details, please refer to Figures 3-4 The planetary gear transmission assembly 1 includes a gear ring 101, a driving gear 102 rotatably connected inside the gear ring 101, and a first driven gear 103 rotatably connected inside the gear ring 101. The first driven gear 103 meshes with the driving gear 102. Above the first driven gear 103, a second driven gear 104 is coaxially arranged with the first driven gear 103 and meshes with the gear ring 101. Planetary gears 105 are provided on the second driven gear 104, and the piston push rod 203 is hinged to the planetary gears 105. In use, the driving gear 102 rotates, thereby driving the first driven gear 103 to rotate, which in turn drives the second driven gear 104, which is coaxial with it, to revolve around the axis of the gear ring 101 and rotate around its own axis (i.e., planetary motion), causing the planetary gears 105 on it to move synchronously.

[0030] Please see Figures 2-4 The piston push rod 203 and the planetary gear 105 are hinged in three ways: column hinge, ball hinge, or universal joint hinge. Column hinge is suitable for low-cost and high-reliability scenarios; ball hinge is suitable for high-precision and low-friction scenarios; universal joint hinge is suitable for complex working conditions with changing angles. The three hinge methods correspond to different working conditions and are selected according to specific circumstances during actual production.

[0031] Please see Figures 2-4 When the piston push rod 203 and the planetary gear 105 are hinged in a cylindrical manner, the planetary gear 105 is provided with a pin bearing 106. The pin bearing 106 is offset from the axis of the planetary gear 105. The piston push rod 203 is provided with a through hole 204. The pin bearing 106 is located in the through hole 204 and is rotatably connected to the through hole 204. The piston push rod 203 is hinged to the planetary gear 105 through the pin bearing 106. The eccentric setting of the pin bearing 106 on the planetary gear 105 realizes the linear reciprocating motion of the piston push rod 203 in the plunger cavity 202.

[0032] Please see Figures 2-4 The pin bearing 106 passes through the through hole 204 and extends to the outside of the through hole 204. A fixing member 107 is provided on the pin bearing 106, which is located above the piston push rod 203. The fixing member 107 is used to axially limit the pin bearing 106, prevent the pin bearing 106 from falling out of the through hole 204, avoid transmission failure due to the loosening of the pin bearing 106, and enhance structural safety.

[0033] This invention employs a planetary gear transmission assembly 1 enclosed within a gear ring 101 for transmission and motion conversion. The transmission chain is short, and the meshing efficiency is high. The entire transmission and compression module is highly integrated, eliminating the large lateral space required by traditional crank-connecting rod mechanisms. This achieves extremely high power density and space utilization, resulting in an exceptionally compact structure, making it particularly suitable for space-constrained applications (such as onboard hydrogen systems). Furthermore, the gear meshing transmission has a high contact ratio and load-sharing characteristics, with a load-bearing capacity far exceeding that of articulated connecting rod mechanisms. It also possesses extremely high self-locking strength and overload capacity, ensuring stability and reliability under high-pressure conditions.

[0034] Please see Figures 3-4 It also includes a power drive assembly 3, which includes a prime mover 301. The shaft of the prime mover 301 passes through the gear ring 101 and extends into the gear ring 101. The drive gear 102 is mounted on the shaft of the prime mover 301. In this embodiment, the prime mover 301 is an electric motor. By setting the prime mover 301 to drive the drive gear 102 to rotate, the first driven gear 103 and the second driven gear 104 are driven to rotate in sequence.

[0035] In one embodiment, please refer to Figures 1-4 The planetary gear transmission assembly 1 consists of multiple stages, all housed within the gear ring 101. Each stage meshes sequentially to achieve multi-stage speed reduction and force amplification. When extremely high thrust is required (such as in ultra-high pressure compression), a single-stage planetary gear transmission assembly 1 may not be sufficient. The series connection of multiple stages allows for progressively increasing force, enabling even a smaller power prime mover 301 to drive the high-pressure piston push rod 203, significantly expanding the product's performance range and applicable scenarios. The integrated layout of the multi-stage planetary gear transmission assembly 1 within the gear ring 101 saves space and is suitable for compact gas compression equipment.

[0036] In one embodiment, please refer to Figures 1-4 There are multiple plunger cavities 202, which are evenly distributed around the gear ring 101. The multi-stage planetary gear transmission assembly 1 corresponds to and works in conjunction with the multiple plunger cavities 202 to achieve step-by-step pressurization.

[0037] The present invention can realize the step-by-step deceleration and torque amplification of rotational power by setting up a multi-stage planetary gear transmission assembly 1 with sequential meshing in the same gear ring 101 space; when the power output of each stage drives the corresponding series-connected plunger chambers 202 respectively, the step-by-step pressurization of gas can be achieved efficiently.

[0038] In one embodiment, please refer to Figure 3 The pump body 201 and the gear ring 101 are separate structures, which can be detachably connected by fasteners. The separate structure has the advantages of flexible manufacturing and convenient maintenance. The pump body 201 and the gear ring 101 can be replaced separately when damaged, which reduces manufacturing and maintenance costs.

[0039] In one embodiment, please refer to Figure 3 The pump body 201 and the gear ring 101 are integrated into one piece. This integrated structure reduces the number of connection points, prevents leakage, and improves sealing reliability. In addition, the integrated design increases the rigidity of the structure, prevents deformation under high pressure, and enhances equipment stability.

[0040] The following combination Figures 1-4 The working process of a compressor based on planetary gear transmission according to this application is described as follows: During operation, the prime mover 301 drives the drive gear 102 to rotate, which in turn drives the first driven gear 103 and the second driven gear 104 to rotate in sequence. Since the second driven gear 104 meshes with the gear ring 101, the second driven gear 104 revolves around the axis of the gear ring 101 and rotates around its own axis (i.e., planetary motion), which drives the planetary gears 105 on it to move synchronously. During the rotation of the planetary gears 105, the piston push rod 203 is driven to make linear reciprocating motion in the piston chamber 202 through the pin bearing 106, thereby periodically compressing the gas in the piston chamber 202.

[0041] In summary, this invention provides a compressor based on planetary gear transmission, which, compared with the prior art: (1) By setting up a planetary gear transmission assembly and using the hinged connection between the planetary gear transmission assembly and the piston push rod, the rotational motion of the planetary gear transmission assembly is directly, efficiently and smoothly converted into the pure linear reciprocating motion of the piston push rod, thereby realizing the periodic compression of the gas in the plunger cavity.

[0042] (2) The present invention uses a planetary gear transmission assembly enclosed in a gear ring for transmission and motion conversion. The transmission chain is short and the meshing efficiency is high. The entire transmission and compression module is highly integrated, eliminating the large lateral space required by the traditional crank-connecting rod mechanism. This achieves extremely high power density and space utilization, making the structure exceptionally compact. It is particularly suitable for space-constrained applications (such as vehicle-mounted hydrogen systems). In addition, the gear meshing transmission has a high contact ratio and load-sharing characteristics, and its load-bearing capacity is much higher than that of the articulated connecting rod mechanism. It also has extremely high self-locking strength and overload capacity, ensuring the stability and reliability of operation under high-pressure conditions.

[0043] (3) The conversion process of the present invention is smooth, and the motion law of the piston push rod is a sine curve or a quasi-sine curve, which makes the speed and acceleration of the piston push rod change continuously without sudden changes, fundamentally and significantly reducing the inertial impact force and vibration intensity during operation, reducing noise, and significantly extending the service life of moving parts such as the piston push rod.

[0044] (4) By setting up a multi-stage planetary gear transmission assembly with sequential meshing in the same gear ring space, the present invention can realize the step-by-step deceleration and torque amplification of rotational power; when the power output of each stage drives the corresponding series-connected plunger chambers, the step-by-step pressurization of gas can be achieved efficiently.

[0045] (5) The structure of the present invention is reversible and can be used to generate electricity. By reducing the pressure of hydrogen, the piston push rod is driven to make linear reciprocating motion, which drives the planetary gear transmission assembly to increase speed in the opposite direction, and finally drives the generator to generate electricity, realizing the efficient recovery of pressure energy. Its multi-stage pressure reduction process and multi-stage speed increase transmission are perfectly matched, resulting in high efficiency.

[0046] This invention can be widely applied in the field of gas compressor technology.

[0047] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A compressor based on planetary gear transmission, characterized in that, The assembly includes a planetary gear transmission assembly (1) and a plunger compression assembly (2). The plunger compression assembly (2) is provided with a pump body (201). The pump body (201) is provided with a plunger cavity (202). A piston push rod (203) is slidably connected in the plunger cavity (202). The planetary gear transmission assembly (1) is hinged to the piston push rod (203). The planetary gear transmission assembly (1) rotates to drive the piston push rod (203) to perform linear reciprocating motion in the plunger cavity (202).

2. The compressor based on planetary gear transmission according to claim 1, characterized in that, The planetary gear transmission assembly (1) includes a gear ring (101), a drive gear (102) is rotatably connected inside the gear ring (101), and a first driven gear (103) is also rotatably connected inside the gear ring (101). The first driven gear (103) meshes with the drive gear (102). Above the first driven gear (103), a second driven gear (104) is provided, which is coaxially arranged with the first driven gear (103). The second driven gear (104) meshes with the gear ring (101). A planetary gear (105) is provided on the second driven gear (104), and the piston push rod (203) is hinged to the planetary gear (105).

3. The compressor based on planetary gear transmission according to claim 2, characterized in that, The piston push rod (203) and the planetary gear (105) are hinged by a column hinge, a ball hinge, or a universal joint hinge.

4. The compressor based on planetary gear transmission according to claim 3, characterized in that, When the piston push rod (203) and the planetary gear (105) are hinged in a column hinge manner, the planetary gear (105) is provided with a pin bearing (106), the pin bearing (106) is offset from the axis of the planetary gear (105), the piston push rod (203) is provided with a through hole (204), the pin bearing (106) is located in the through hole (204) and is rotatably connected to the through hole (204), and the piston push rod (203) is hinged to the planetary gear (105) through the pin bearing (106).

5. The compressor based on planetary gear transmission according to claim 4, characterized in that, The pin bearing (106) passes through the through hole (204) and extends to the outside of the through hole (204). A fixing member (107) is provided on the pin bearing (106), and the fixing member (107) is located above the piston push rod (203).

6. The compressor based on planetary gear transmission according to claim 2, characterized in that, It also includes a power drive assembly (3), which includes a prime mover (301), the shaft of which passes through the gear ring (101) and extends into the gear ring (101), and the drive gear (102) is disposed on the shaft of the prime mover (301).

7. The compressor based on planetary gear transmission according to claim 2, characterized in that, The number of planetary gear transmission components (1) is multi-stage, and all the multi-stage planetary gear transmission components (1) are set in the gear ring (101). The planetary gear transmission components (1) of each stage mesh in sequence to achieve multi-stage deceleration and force amplification.

8. The compressor based on planetary gear transmission according to claim 7, characterized in that, The number of plunger cavities (202) is multiple, and the multiple plunger cavities (202) are evenly distributed around the gear ring (101). The multi-stage planetary gear transmission assembly (1) corresponds to and cooperates with the multiple plunger cavities (202) to achieve step-by-step pressurization.

9. The compressor based on planetary gear transmission according to claim 2, characterized in that, The pump body (201) and the gear ring (101) are separate structures.

10. The compressor based on planetary gear transmission according to claim 2, characterized in that, The pump body (201) and the gear ring (101) are an integral structure.

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