Natural gas station integrated pressure energy recovery power generation equipment

Abstract

The invention solves the problem that in natural gas station equipment, connecting bolts on an inner barrel of an expansion machine and a sealing end barrel are prone to loosening, and relates to the technical field of power generation equipment, in particular to natural gas station integrated pressure energy recovery power generation equipment which comprises a bearing plate, and the bearing plate is provided with the expansion machine, a gear box and a power generator. The gearbox is used for transmitting mechanical energy of the expansion machine to the power generator, a lubricating oil station is further installed at the top of the bearing plate, the output end of the lubricating oil station communicates with the gearbox, the expansion machine comprises a volute, a sealing end barrel is arranged in the volute, and an inner barrel attached to the surface of the sealing end barrel is arranged in an inner cavity of the volute. An impeller set extending into the inner cylinder is arranged in the sealing end cylinder, a plurality of bolts extending into the sealing end cylinder are arranged along the edge of the outer side of the inner cylinder, and the outer surfaces of the bolts are all sleeved with gear ring sets. The natural gas leakage loss in the expansion machine can be effectively reduced, and the pressure energy conversion efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of power generation equipment technology, specifically to an integrated pressure energy recovery power generation device for natural gas stations. Background Technology

[0002] With the construction of natural gas pipeline networks, the current global trend in gas pipeline development is towards longer distances, larger diameters, higher pressures, and greater network coverage. High-pressure natural gas transported from high-pressure trunk lines needs to be depressurized at city gas receiving stations, pressure regulating stations, and gas turbine power plants to meet the pressure requirements of downstream users before it can be supplied to ordinary consumers. This pressure regulation process generates a significant pressure drop, releasing a large amount of energy. If this pressure energy can be recovered and utilized appropriately, energy efficiency and the economics of natural gas pipeline network operation can be greatly improved.

[0003] Natural gas station equipment experiences frequent vibrations during operation, and critical connecting components such as the bolts linking the expander inner cylinder and the sealing end cylinder are highly susceptible to loosening under the influence of vibration. Loose connections significantly increase the risk of natural gas leaks, not only wasting energy but also potentially causing serious safety accidents such as fires and explosions. Furthermore, misalignment of components accelerates equipment wear, shortens equipment lifespan, and affects stable equipment operation. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an integrated pressure energy recovery power generation device for natural gas stations, so as to solve the problem mentioned in the background art that the connecting bolts on the inner cylinder of the expander and the sealing end cylinder of the natural gas station equipment are prone to loosening.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated pressure energy recovery power generation device for natural gas stations, including a support plate, wherein an expander, a gearbox and a generator are installed on the support plate, the gearbox is used to transmit the mechanical energy of the expander to the generator, and a lubricating oil station is also installed on the top of the support plate, the output end of the lubricating oil station being connected to the gearbox; The expander includes a volute, inside which is a sealed end cylinder. The inner cavity of the volute has an inner cylinder that fits against the surface of the sealed end cylinder. An impeller assembly extending into the inner cylinder is located inside the sealed end cylinder. Several bolts extending into the sealed end cylinder are located along the outer edge of the inner cylinder. A toothed ring assembly is fitted on the outer surface of each of the bolts. An inner ring body and an outer ring body that are rotatably fitted are located on the outer side of the inner cylinder. The extended end of the outer ring body is rotatably connected to the several toothed ring assemblies. The inner ring body and the several toothed ring assemblies are engaged through tooth grooves. When the inner ring body rotates, the toothed ring assemblies drive the several bolts to rotate synchronously.

[0006] Preferably, the bolt is formed integrally with a hexagonal head and a threaded rod.

[0007] Preferably, the gear ring includes a hexagonal threaded sleeve that fits into the hexagonal head, the outer side of the hexagonal threaded sleeve is provided with an annular tooth groove, and the side of the hexagonal threaded sleeve away from the sealing end cylinder is provided with an annular connecting groove.

[0008] Preferably, a number of positioning hangers are installed on the side of the outer ring body away from the sealing end cylinder, and one end of each of the positioning hangers extends into the annular connecting groove on a number of hexagonal threaded sleeves.

[0009] Preferably, the outer ring body has an annular groove inside, and the cross-sectional shape of the annular groove is cross-shaped.

[0010] Preferably, the inner ring body includes a solid ring, and the inner wall of the solid ring is provided with a gear ring, which meshes with several gear ring groups through annular tooth grooves.

[0011] Preferably, the solid ring has a second gear ring on its outer side, and both sides of the second gear ring have enlarged edge strips, and both the second gear ring and the enlarged edge strips are located inside the annular groove.

[0012] Preferably, the surface of the outer ring body is provided with a slot that communicates with the annular groove; The inner wall of the volute is equipped with a spring structure. One end of the spring structure is equipped with a limiting block. The bottom of the limiting block passes through the slot and meshes with the gear ring II located in the annular groove through the tooth groove.

[0013] By employing the above technical solution, the present invention provides an integrated pressure energy recovery and power generation device for natural gas stations, which has at least the following beneficial effects: 1. In this integrated pressure energy recovery power generation equipment for natural gas stations, the expander's internal structure, through the cooperation of the volute, sealed end cylinder, inner cylinder, and impeller assembly, ensures that high-pressure natural gas can efficiently drive the impeller rotation, while reducing natural gas leakage losses and improving pressure energy conversion efficiency.

[0014] 2. In this integrated pressure energy recovery power generation equipment for natural gas stations, when the sealing end cylinder and inner cylinder of the expander's internal structure are in place, only the rotational force needs to be applied to the inner ring body to achieve the purpose of driving several bolts to rotate uniformly, effectively reducing the time spent on tightening the sealing end cylinder and inner cylinder edges.

[0015] 3. This invention utilizes the cooperation of the inner ring body, outer ring body, and gear ring assembly to form a whole with several bolts. After the bolts tighten and close the inner cylinder and the sealing end cylinder, the spring structure's return extension causes the bottom of the limiting block to pass through the slot and mesh with the gear ring located in the annular groove through the tooth groove. This provides a limiting and self-locking function for the inner ring body, avoiding the risk of bolt loosening, improving the safety and reliability of equipment operation, and reducing manual maintenance costs. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional structural diagram of the expander of the present invention; Figure 3 This is a schematic diagram of the split structure of the inner ring and outer ring of the present invention; Figure 4 This is a schematic diagram of a partial cross-sectional structure of the outer ring body of the present invention; Figure 5 This is a schematic diagram of the disassembled structure of the bolt and toothed ring assembly of the present invention; Figure 6 This is a schematic diagram of the installation structure of the outer ring and inner cylinder of the present invention; Figure 7 For the present invention Figure 6 The structural diagram at point A in the diagram.

[0017] In the diagram: 1. Bearing plate; 2. Expander; 201. Volute; 202. Sealing end sleeve; 203. Inner cylinder; 204. Impeller assembly; 205. Bolt; 206. Gear ring assembly; 2061. Hexagonal threaded sleeve; 2062. Annular gear groove; 2063. Annular connecting groove; 207. Inner ring body; 2071. Solid ring; 2072. Gear ring one; 2073. Gear ring two; 2074. Expanding strip; 208. Outer ring body; 2081. Positioning lifting component; 2082. Annular groove; 2083. Groove opening; 209. Spring structure; 2091. Limiting block; 3. Gearbox; 4. Generator; 5. Lubricating oil station. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "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 the present invention and simplifying the description, and do not indicate or imply 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 of the present invention.

[0019] Example 1 Please see Figures 1-7This invention proposes an integrated pressure energy recovery and power generation device for natural gas stations, used to recover the pressure energy of natural gas stations and convert it into electrical energy. The overall structure includes a support plate 1, which serves as the installation foundation for the device. An expander 2, a gearbox 3, and a generator 4 are sequentially fixed on the top surface of the support plate 1 along a horizontal direction. The input end of the gearbox 3 is drive-connected to the output shaft of the expander 2, and the output end is drive-connected to the input end of the generator 4, thus transferring the mechanical energy output by the expander 2 to the generator 4, realizing the conversion of mechanical energy into electrical energy.

[0020] In addition, a lubrication station 5 is fixedly installed on the top surface of the bearing plate 1. The output end of the lubrication station 5 is connected to the lubrication channel of the gearbox 3 through an oil pipe, which is used to provide continuous lubrication for the gear meshing parts in the gearbox 3 and reduce transmission loss.

[0021] Among them, the expander 2 is the core component for pressure energy conversion. It includes a volute 201, a sealing end cylinder 202 is coaxially arranged inside the volute 201, and an inner cylinder 203 is fixedly installed in the inner cavity of the volute 201. The inner wall of the inner cylinder 203 is tightly fitted with the outer surface of the sealing end cylinder 202 to form a sealed cavity. An impeller assembly 204 is rotatably arranged inside the sealing end cylinder 202. The blades of the impeller assembly 204 extend into the inner cylinder 203. Under the pressure of the natural gas in the volute 201, the impeller assembly 204 is driven to rotate, converting pressure energy into mechanical energy of the impeller assembly 204. The end of the impeller assembly 204 away from the inner cylinder 203 extends into the gearbox 3.

[0022] Several bolts 205 extending into the sealing end cylinder 202 are provided along the outer edge of the inner cylinder 203 for fastening the inner cylinder 203 and the sealing end cylinder 202. A toothed ring assembly 206 is fitted onto the outer surface of each bolt 205. The toothed ring assembly 206 rotates synchronously with the bolt 205. An inner ring body 207 and an outer ring body 208 are provided on the outer side of the inner cylinder 203. The inner ring body 207 can rotate circumferentially relative to the outer ring body 208. The extended end of the outer ring body 208 is rotatably connected to the toothed ring assembly 206 to limit the axial displacement of the toothed ring assembly 206. The inner ring body 207 and the toothed ring assembly 206 are engaged through tooth grooves. When the inner ring body 207 is driven to rotate by an external force, it can drive the toothed ring assembly 206 to rotate synchronously through tooth groove engagement, thereby driving the bolts 205 to rotate synchronously, achieving automatic tightening or loosening of the bolts 205 and preventing loosening of the connection due to long-term vibration.

[0023] Following the above, the specific steps for assembling the internal structure of expander 2 are as follows: S1. First, install the sealing end cylinder 202 coaxially inside the volute 201 to ensure that a natural gas flow cavity is reserved between the two; then fit the inner cylinder 203 into the inner cavity of the volute 201 so that the inner wall of the inner cylinder 203 is tightly fitted with the outer surface of the sealing end cylinder 202 to prevent natural gas leakage. S2. Rotate the impeller assembly 204 into the sealed end cylinder 202, with the blade portion of the impeller assembly 204 extending into the inner cylinder 203, and leaving a small gap with the inner wall of the inner cylinder 203 to avoid friction. S3. The entire assembly consisting of the inner ring 207, the outer ring 208, and several toothed ring groups 206 is fitted onto the outside of the inner cylinder 203. Then, several bolts 205 are evenly distributed along the outer edge of the inner cylinder 203. The screw ends of the bolts 205 are passed through the side wall of the inner cylinder 203 and threadedly connected to the corresponding screw holes of the sealing end cylinder 202 for initial tightening. S4. Move the entire assembly consisting of the inner ring body 207, the outer ring body 208, and several toothed ring assemblies 206 so that the toothed ring assembly 206 and the head (such as a hexagonal head) of the bolt 205 form a circumferential limiting fit. S5. Rotate the inner ring 207 toward the side closer to the gearbox 3, causing it to rotate circumferentially along the outer side of the inner cylinder 203, while driving several gear ring groups 206 that mesh with it to rotate accordingly, thereby controlling several bolts 205 to rotate accordingly.

[0024] As can be seen from the above, only the rotational force needs to be applied to the inner ring 207 to achieve the purpose of driving several bolts 205 to rotate uniformly. Based on this, the time spent on fastening the sealing end cylinder 202 and the edge of the inner cylinder 203 is effectively reduced.

[0025] Furthermore, the cooperation of the volute 201, the sealing end cylinder 202, the inner cylinder 203, and the impeller assembly 204 ensures that the high-pressure natural gas can efficiently drive the impeller to rotate, while reducing natural gas leakage losses and improving pressure energy conversion efficiency.

[0026] In addition, the vibration during the operation of the expander 2 may cause the bolts 205 connecting the inner cylinder 203 and the sealing end cylinder 202 to loosen, which may lead to natural gas leakage or component misalignment. In severe cases, it may cause friction between the impeller assembly 204 and the inner cylinder 203 and damage to the equipment. Traditional bolts 205 require regular manual inspection and tightening, which is costly to maintain and has the risk of oversight. Furthermore, since the bolts 205, which are specifically emphasized in this embodiment, are located in the inner cavity of the expander 2, their loosening inspection is more difficult than that of the fastening screws on the outside.

[0027] In this embodiment, the cooperation of the inner ring body 207, the outer ring body 208 and the toothed ring group 206 forms an automatic bolt 205 fastening mechanism—making the movement of all bolts 205 interconnected. The stiffness of a single bolt 205 is low, and it may resonate (amplitude amplification) under vibration at a specific frequency, accelerating loosening. However, the overall stiffness of the bolt group (including the inner ring body 207, the outer ring body 208 and several toothed ring groups 206) is significantly improved, and the resonance frequency shifts to a higher frequency, away from the vibration frequency of the expander 2, thereby reducing the violent displacement caused by resonance and reducing the probability of loosening.

[0028] Example 2 Bolt 205 is integrally formed with a hexagonal head and a screw. The hexagonal head is located on the outside of the inner cylinder 203, and the screw extends through the side wall of the inner cylinder 203 to the inside of the sealing end cylinder 202 and is threadedly connected to the screw hole of the sealing end cylinder 202. The toothed ring assembly 206 includes a hexagonal threaded sleeve 2061 that matches the hexagonal head of bolt 205. The inner wall of the hexagonal threaded sleeve 2061 is provided with a hexagonal hole that matches the hexagonal head. After being fitted, it can rotate synchronously with bolt 205 and the relative circumferential displacement between the two can be restricted by the hexagonal structure.

[0029] The outer wall of the hexagonal threaded sleeve 2061 is uniformly provided with annular toothed grooves 2062 along the circumference. The annular toothed grooves 2062 are matched and meshed with the toothed grooves of the inner ring body 207, providing a meshing basis for power transmission. The hexagonal threaded sleeve 2061 is provided with an annular connecting groove 2063 on the side away from the sealing end cylinder 202 (i.e. the side close to the hexagonal head). The annular connecting groove 2063 is an annular groove structure, which is used to cooperate with the extended end of the outer ring body 208 to restrict the axial movement of the toothed ring assembly 206.

[0030] In this embodiment, the engagement structure between the hexagonal threaded sleeve 2061 and the hexagonal head of the bolt 205 ensures that the rotation of the toothed ring assembly 206 can be accurately transmitted to the bolt 205. At the same time, the annular toothed groove 2062 and the annular connecting groove 2063 provide a structural basis for meshing transmission and axial limiting, respectively, thereby improving the reliability of the automatic tightening of the bolt 205.

[0031] Example 3 On the side of the outer ring body 208 away from the sealing end cylinder 202 (i.e., the side near the hexagonal head of the bolt 205), several positioning hangers 2081 are uniformly fixedly installed circumferentially. The positioning hangers 2081 are L-shaped plate structures, one end of which is fixedly connected to the outer wall of the outer ring body 208, and the other end extends axially into the annular connecting groove 2063 of the hexagonal threaded sleeve 2061. The extended end of the positioning hanger 2081 is clearance-fitted with the inner wall of the annular connecting groove 2063, which does not affect the rotation of the hexagonal threaded sleeve 2061, and can restrict the axial displacement of the toothed ring assembly 206 through the two side groove walls of the annular connecting groove 2063, so as to prevent the toothed ring assembly 206 from disengaging from the inner ring body 207.

[0032] An annular groove 2082 is formed circumferentially inside the outer ring body 208. The cross-sectional shape of the annular groove 2082 is cross-shaped, including a radially extending horizontal groove and an axially extending vertical groove. This provides space for the rotation of the inner ring body 207 and restricts the radial displacement of the inner ring body 207 through the groove wall, ensuring a stable fit between the inner ring body 207 and the outer ring body 208. This embodiment further defines the structure of the outer ring body 208 and its mating relationship with the toothed ring assembly 206, based on Embodiment 2.

[0033] Example 4 The inner ring 207 includes a solid ring 2071, which is made of metal. A gear ring 2072 is fixedly provided on its inner wall along the circumference. The tooth surface of the gear ring 2072 meshes with the annular tooth grooves 2062 of several gear ring groups 206. When the solid ring 2071 rotates, the gear ring 2072 drives all gear ring groups 206 to rotate synchronously through the tooth groove meshing.

[0034] A gear ring 2073 is fixedly provided on the outer side wall of the solid ring 2071 along the circumference. Both sides of the gear ring 2073 are integrally formed with an expanding strip 2074, which is an annular protrusion structure. The gear ring 2073 and the expanding strip 2074 are located in the annular groove 2082 of the outer ring body 208. The expanding strip 2074 is clearance-fitted with the horizontal groove wall of the annular groove 2082 to limit the axial displacement of the inner ring body 207 and ensure stable meshing between the gear ring 2072 and the gear ring assembly 206. The gear ring 2073 is used to cooperate with the external drive structure to receive rotational power.

[0035] Example 5 The outer ring body 208 has a slot 2083 on its surface, which penetrates the side wall of the outer ring body 208 radially and communicates with the interior of the annular groove 2082. A spring structure 209 is fixedly installed on the inner wall of the volute 201. The spring structure 209 includes a sleeve and an internal spring, and its axial extension direction is consistent with the extension direction of the slot 2083. A limiting block 2091 is fixedly installed at the extension end of the spring structure 209. The bottom of the limiting block 2091 extends through the slot 2083 into the annular groove 2082, and the bottom of the limiting block 2091 is provided with a tooth groove that meshes with the gear ring 2073.

[0036] When the inner ring 207 needs to be driven to rotate, the external force pushes the limiting block 2091 to compress the spring structure 209, so that the limiting block 2091 disengages from the gear ring 2073, and the inner ring 207 can rotate freely. When it is necessary to fix the position of the inner ring 207 (such as after the bolt 205 is tightened in place), the spring structure 209 resets and pushes the limiting block 2091, so that it engages with the gear ring 2073 through the tooth groove, restricting the rotation of the inner ring 207, thereby fixing the position of the gear ring assembly 206 and the bolt 205, ensuring a stable tightening state.

[0037] In this embodiment, the controllable switching of the rotation state of the inner ring 207 is achieved through the cooperation of the spring structure 209 and the limiting block 2091. This facilitates the automatic tightening of the drive bolt 205 and locks the position after tightening, thereby improving the stability of the equipment operation.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An integrated pressure energy recovery power generation device for natural gas stations, comprising a support plate (1), characterized in that: The support plate (1) is equipped with an expander (2), a gearbox (3) and a generator (4). The gearbox (3) is used to transmit the mechanical energy of the expander (2) to the generator (4). A lubricating oil station (5) is also installed on the top of the support plate (1). The output end of the lubricating oil station (5) is connected to the gearbox (3). The expander (2) includes a volute (201), inside which is a sealing end cylinder (202). The inner cavity of the volute (201) has an inner cylinder (203) that fits against the surface of the sealing end cylinder (202). Inside the sealing end cylinder (202) is an impeller assembly (204) extending into the inner cylinder (203). Along the outer edge of the inner cylinder (203) are several bolts (205) extending into the sealing end cylinder (202). The outer surface of the inner cylinder (205) is fitted with a toothed ring assembly (206). The outer side of the inner cylinder (203) is provided with an inner ring body (207) and an outer ring body (208) that are rotatably fitted. The extended end of the outer ring body (208) is rotatably connected to several of the toothed ring assemblies (206). The inner ring body (207) and several of the toothed ring assemblies (206) are engaged by tooth groove matching. When the inner ring body (207) rotates, the toothed ring assembly (206) drives several of the bolts (205) to rotate synchronously.

2. The integrated pressure energy recovery and power generation equipment for natural gas stations according to claim 1, characterized in that: The bolt (205) is formed integrally from a hexagonal head and a threaded rod.

3. The integrated pressure energy recovery and power generation equipment for natural gas stations according to claim 1, characterized in that: The gear ring (206) includes a hexagonal threaded sleeve (2061) that fits into the hexagonal head. The outer side of the hexagonal threaded sleeve (2061) is provided with an annular tooth groove (2062), and the side of the hexagonal threaded sleeve (2061) away from the sealing end cylinder (202) is provided with an annular connecting groove (2063).

4. The integrated pressure energy recovery and power generation equipment for natural gas stations according to claim 1, characterized in that: The outer ring (208) is equipped with a number of positioning hangers (2081) on the side away from the sealing end cylinder (202), and one end of each of the positioning hangers (2081) extends into the annular connecting groove (2063) on a number of hexagonal threaded sleeves (2061).

5. The integrated pressure energy recovery and power generation equipment for natural gas stations according to claim 1, characterized in that: The outer ring (208) has an annular groove (2082) inside, and the cross-sectional shape of the annular groove (2082) is cross-shaped.

6. The integrated pressure energy recovery and power generation equipment for natural gas stations according to claim 1, characterized in that: The inner ring body (207) includes a solid ring (2071), and the inner wall of the solid ring (2071) is provided with a gear ring (2072), and the gear ring (2072) meshes with a plurality of gear ring groups (206) through annular tooth grooves (2062).

7. The integrated pressure energy recovery and power generation equipment for natural gas stations according to claim 1, characterized in that: The solid ring (2071) has a gear ring two (2073) on its outer side. Both sides of the gear ring two (2073) are provided with edging strips (2074), and the gear ring two (2073) and the edging strips (2074) are located inside the annular groove (2082).

8. The integrated pressure energy recovery power generation equipment for natural gas stations according to claim 1, characterized in that: The surface of the outer ring (208) is provided with a slot (2083) that communicates with the annular groove (2082); The inner wall of the volute (201) is equipped with a spring structure (209). A limit block (2091) is installed at one end of the spring structure (209). The bottom of the limit block (2091) passes through the slot (2083) and meshes with the gear ring (2073) located in the annular groove (2082) through tooth groove matching.

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