An injection device for low-pressure natural gas extraction and transportation

Abstract

This utility model discloses an injection device for low-pressure natural gas extraction and transportation, including an injection device body, a valve assembly, and a valve seat. The valve seat is a cavity with an open upper end. A fixing plate is fixedly installed inside the valve seat, and a one-way oil outlet valve and a one-way oil inlet valve are installed on the fixing plate. A piston head is elastically and slidably installed at the upper end of the fixing plate, and hydraulic oil is filled between the fixing plate and the piston head. A buffer plate is elastically and slidably installed at the lower end of the fixing plate, and hydraulic oil is filled between the fixing plate and the buffer plate. The upper end of the piston head extends into the interior of the injection device body and abuts against the lower end of the valve assembly. This utility model, by setting up a piston head, a fixing plate, a buffer plate, and hydraulic oil, can buffer the impact force generated by the valve assembly in the injection device body during continuous reciprocating motion by squeezing the hydraulic oil after the piston head is impacted by the valve assembly, thus preventing damage to the valve seat and extending the service life of the valve seat.

Description

Technical Field

[0001] This utility model relates to the field of natural gas extraction technology, specifically to an injection device for low-pressure natural gas extraction and transportation. Background Technology

[0002] Natural gas extraction and transportation play a crucial role in national economic development, providing clean energy and raw materials for people's lives and industrial production. Currently, pipeline transportation is used in the natural gas extraction and transportation process. When the wellhead gas pressure is lower than the transportation pressure, a gas injection device is needed to pressurize the gas before it can be introduced into the pipeline. High-pressure gas connected to the gas injection device enters the valve assembly through the gas channel, and the opening and closing of the valve assembly controls the high-pressure gas to be ejected from the valve assembly and closed. The valve seat assembly is in gas communication with the valve assembly. When the valve assembly is open, high-pressure gas enters the valve seat assembly through the gas channel and is ejected from the valve seat assembly. In order to effectively control the gas injection device, the existing technology uses a valve seat assembly, which includes a valve seat and an injection port. The valve piston of the valve assembly will impact the valve seat multiple times during continuous reciprocating motion. Over a long period of time, the valve seat is prone to damage.

[0003] For example, utility model patent application number CN200820080139.1 discloses an injection device for low-pressure natural gas extraction and transportation, applied in the field of natural gas extraction and transportation technology. Its features include: a gas guide pipe fixed between the high-pressure natural gas inlet end of the three-way housing and the connecting pipe; one end of the gas guide pipe being inside the high-pressure natural gas inlet end of the three-way housing; a main gas nozzle being inside the high-pressure natural gas inlet end of the three-way housing; and the end of the gas guide pipe being pressed and fixed to the main gas nozzle. A mixing chamber and a diffuser are fixed between the natural gas outlet flange of the three-way housing and the connecting pipe; one end of the mixing chamber being inside the natural gas outlet end of the three-way housing and opposite to the main gas nozzle; and the outer wall of the main gas nozzle outlet and the inner wall of the mixing chamber inlet forming an annular channel for low-pressure natural gas intake.

[0004] Although this type of injection device for low-pressure natural gas extraction and transportation achieves efficient extraction and transportation of low-pressure natural gas by utilizing injection technology, and the gas velocity and temperature of high and low pressure gas are uniform after passing through the injector, which is conducive to the stability of the transmission pipeline pressure, the valve piston of the valve assembly in the injection device will repeatedly impact the valve seat during continuous reciprocating motion. In the long-term impact process, it is very easy to cause damage to the valve seat; further improvement is needed. Utility Model Content

[0005] The purpose of this invention is to provide an injection device for low-pressure natural gas extraction and transportation, which aims to improve the problem that the valve piston in the valve assembly of the injection device will repeatedly impact the valve seat during continuous reciprocating motion, which can easily lead to damage to the valve seat during long-term impact.

[0006] This utility model is implemented as follows: an injection device for low-pressure natural gas extraction and transportation includes an injection device body, which includes a valve assembly and a valve seat. The valve seat is a cavity with an open upper end. A fixing plate is fixedly installed inside the valve seat, and a one-way oil outlet valve and a one-way oil inlet valve are installed on the fixing plate. A piston head is elastically and slidably installed at the upper end of the fixing plate, and hydraulic oil is filled between the fixing plate and the piston head. A buffer plate is elastically and slidably installed at the lower end of the fixing plate, and hydraulic oil is filled between the fixing plate and the buffer plate. The upper end of the piston head extends into the interior of the injection device body and abuts against the lower end of the valve assembly.

[0007] Preferably, the lower side of the injection device body is symmetrically provided with a first mounting ear with a bolt hole, and the valve seat body is provided with a second mounting ear corresponding to each first mounting ear, and a bolt is installed in the bolt hole.

[0008] Preferably, a slide cylinder is fixedly provided at the lower end of the piston head, and a matching slide rod is fixedly provided on the fixed plate at the position corresponding to the slide cylinder, and the slide rod is slidably disposed in the slide cylinder; a shock-absorbing spring is fixedly provided on the fixed plate and fitted on the slide rod, and a groove is provided at the lower end of the piston head at the position corresponding to the shock-absorbing spring, and the upper end of the shock-absorbing spring is installed in the groove.

[0009] Preferably, a plurality of support rods are fixedly provided between the lower end of the fixed plate and the bottom of the valve seat body, and a sliding cylinder is provided at the position of each support rod on the buffer plate. The buffer plate is slidably disposed inside the valve seat body through the sliding cylinder. A buffer spring is also fitted between the support rod and the bottom end of the valve seat body.

[0010] Preferably, the valve port of the one-way oil outlet valve faces the piston head direction, the valve port of the one-way oil inlet valve faces the buffer plate area, and the flow rate of the one-way oil outlet valve is greater than the flow rate of the one-way oil inlet valve.

[0011] Preferably, the piston head and the buffer plate are both sealed and slide inside the valve seat body; the slide cylinder and the support rod slide in a sealed manner.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model, by setting up a piston head, a fixed plate, a buffer plate and hydraulic oil, can buffer the impact force generated by the valve assembly in the body of the injection device during continuous reciprocating motion by squeezing the hydraulic oil after the piston head is impacted by the valve assembly, thereby avoiding damage to the valve seat and extending the service life of the valve seat.

[0014] 2. By setting shock-absorbing springs and buffer springs, the buffer device can automatically return to its initial position through the elastic force of the shock-absorbing springs and buffer springs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly structure of this utility model.

[0016] In the diagram: 1. Valve seat body; 101. Mounting ear No. 2; 2. Injection device body; 201. Valve assembly; 202. Mounting ear No. 1; 3. Bolt; 4. Piston head; 5. Slide cylinder; 6. Slide rod; 7. Groove; 8. Shock-absorbing spring; 9. Fixing plate; 10. One-way oil outlet valve; 11. One-way oil inlet valve; 12. Support rod; 13. Slide cylinder; 14. Buffer plate; 15. Buffer spring; 16. Hydraulic oil. Detailed implementation method:

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0019] Example 1

[0020] like Figure 1 As shown, an injection device for low-pressure natural gas extraction and transportation includes an injection device body 2 and a valve seat body 1. The injection device body 2 includes a valve assembly 201. The injection device body 2 is detachably mounted on the upper end of the valve seat body 1. The lower side of the injection device body 2 is symmetrically provided with first mounting ears 202 with bolt holes. The valve seat body 1 is provided with corresponding second mounting ears 101 at the positions of the first mounting ears 202. Bolts 3 are installed in the bolt holes. The valve seat body 1 is a cavity with an open upper end. A fixing plate 9 is fixedly installed inside the valve seat body 1. The inside of the valve seat body 1 is divided into upper and lower parts by the fixing plate 9.

[0021] like Figure 1As shown, a piston head 4 is elastically and slidably mounted on the upper end of the fixed plate 9, and hydraulic oil 16 is filled between the fixed plate 9 and the piston head 4. A slide cylinder 5 is fixedly mounted on the lower end of the piston head 4. A matching slide rod 6 is fixedly mounted on the fixed plate 9 at the position corresponding to the slide cylinder 5, and the slide rod 6 is slidably mounted in the slide cylinder 5. A shock-absorbing spring 8 is fixedly mounted on the fixed plate 9 and fitted onto the slide rod 6. A groove 7 is provided on the lower end of the piston head 4 at the position corresponding to the shock-absorbing spring 8, and the upper end of the shock-absorbing spring 8 is installed in the groove 7. A buffer plate 14 is elastically and slidably mounted on the lower end of the fixed plate 9, and hydraulic oil 16 is filled between the fixed plate 9 and the buffer plate 14. Multiple support rods 12 are fixedly mounted between the lower end of the fixed plate 9 and the bottom of the valve seat body 1. Sliding sleeves 13 are provided at the positions of the plate 14 and the support rod 12, and the buffer plate 14 is slidably disposed inside the valve seat body 1 through the sliding sleeves 13; a buffer spring 15 is also fitted between the support rod 12 and the bottom of the valve seat body 1; a one-way oil outlet valve 10 and a one-way oil inlet valve 11 are provided on the fixed plate 9, and the upper end of the piston head 4 extends into the interior of the injection device body 2 and abuts against the lower end of the valve assembly 201; the valve port of the one-way oil outlet valve 10 faces the piston head 4, and the valve port of the one-way oil inlet valve 11 faces the area of ​​the buffer plate 14. The flow rate of the one-way oil outlet valve 10 is greater than the flow rate of the one-way oil inlet valve 11. The piston head 4 and the buffer plate 14 are both sealed and slid inside the valve seat body 1; the sliding sleeve 13 and the support rod 12 are sealed and slid together.

[0022] Example 2

[0023] like Figure 1 As shown, an injection device for low-pressure natural gas extraction and transportation includes an injection device body 2 and a valve seat body 1. The injection device body 2 includes a valve assembly 201. The injection device body 2 is detachably mounted on the upper end of the valve seat body 1. The lower side of the injection device body 2 is symmetrically provided with first mounting ears 202 with bolt holes. The valve seat body 1 is provided with corresponding second mounting ears 101 at the positions of each first mounting ear 202. Bolts 3 are installed in the bolt holes. The valve seat body 1 is a cavity with an open upper end. A fixing plate 9 is fixedly installed inside the valve seat body 1.

[0024] like Figure 1As shown, a piston head 4 is elastically and slidably mounted on the upper end of the fixed plate 9, and hydraulic oil 16 is filled between the fixed plate 9 and the piston head 4. A slide cylinder 5 is fixedly mounted on the lower end of the piston head 4. A matching slide rod 6 is fixedly mounted on the fixed plate 9 at the position corresponding to the slide cylinder 5, and the slide rod 6 is slidably mounted in the slide cylinder 5. A shock-absorbing spring 8 is fixedly mounted on the fixed plate 9 and fitted onto the slide rod 6. A groove 7 is provided on the lower end of the piston head 4 at the position corresponding to the shock-absorbing spring 8, and the upper end of the shock-absorbing spring 8 is installed in the groove 7. A buffer plate 14 is elastically and slidably mounted on the lower end of the fixed plate 9, and hydraulic oil 16 is filled between the fixed plate 9 and the buffer plate 14. Multiple support rods 12 are fixedly mounted between the lower end of the fixed plate 9 and the bottom of the valve seat body 1. Sliding sleeves 13 are provided at the positions of the plate 14 and the support rod 12, and the buffer plate 14 is slidably disposed inside the valve seat body 1 through the sliding sleeves 13; a buffer spring 15 is also fitted between the support rod 12 and the bottom of the valve seat body 1; a one-way oil outlet valve 10 and a one-way oil inlet valve 11 are provided on the fixed plate 9, and the upper end of the piston head 4 extends into the interior of the injection device body 2 and abuts against the lower end of the valve assembly 201; the valve port of the one-way oil outlet valve 10 faces the piston head 4, and the valve port of the one-way oil inlet valve 11 faces the area of ​​the buffer plate 14. The flow rate of the one-way oil outlet valve 10 is greater than the flow rate of the one-way oil inlet valve 11. The piston head 4 and the buffer plate 14 are both sealed and slid inside the valve seat body 1; the sliding sleeve 13 and the support rod 12 are sealed and slid together.

[0025] The working principle of this utility model is as follows: During use, when the valve piston of the valve assembly 201 inside the injection device body 2 impacts the valve seat body 1, the piston head 4 is forced to move the slide cylinder 5 downward, compressing the damping spring 8. At the same time, the hydraulic oil 16 between the piston head 4 and the fixed plate 9 is squeezed and flows from the one-way inlet valve 11 into the cavity between the fixed plate 9 and the buffer plate 14. As the amount of hydraulic oil 16 increases, the buffer plate 14 moves downward, and the buffer spring 15 is compressed. The overall process produces a stable damping effect on the impact force of the injection device body 2, effectively buffering the impact force of the injection device body 2 and reducing the valve seat pressure. Damage to body 1 extends the service life of the device. When the impact force of the injection device body 2 disappears, the elastic recovery of the buffer spring 15 causes the buffer plate 14 to press upward. At the same time, the elastic recovery of the shock absorber spring 8 causes the piston head 4 to move upward. The upward movement of the piston head 4, through the suction force generated in the cavity between the fixed plate 9 and the buffer plate 14 by the one-way oil outlet valve 10 and the upward pressing force of the buffer plate 14, allows the hydraulic oil 16 to quickly enter the cavity between the piston head 4 and the fixed plate 9 through the one-way oil outlet valve 10, so as to realize the piston head 4 to quickly buffer and rebound the piston valve of the valve assembly 201, which is convenient to return to the initial state and improves working efficiency.

[0026] In summary, this utility model, by setting up a piston head 4, a fixed plate 9, a buffer plate 14, and hydraulic oil 16, can buffer the impact force generated by the valve assembly 201 in the injection device body 2 during continuous reciprocating motion by squeezing the hydraulic oil after the piston head 4 is impacted by the valve assembly 201, thus avoiding damage to the valve seat body 1 and extending the service life of the valve seat body 1; by setting up a shock-absorbing spring 8 and a buffer spring 15, the buffer device can automatically return to its initial position by the elastic force of the shock-absorbing spring 8 and the buffer spring 15.

[0027] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An injection device for low-pressure natural gas extraction and transportation, comprising an injection device body (2), said injection device body (2) including a valve assembly (201), characterized in that, It also includes a valve seat body (1), which is a cavity with an open top. A fixing plate (9) is fixedly installed inside the valve seat body (1). A one-way oil outlet valve (10) and a one-way oil inlet valve (11) are installed on the fixing plate (9). A piston head (4) is elastically and slidably installed at the upper end of the fixing plate (9), and hydraulic oil (16) is filled between the fixing plate (9) and the piston head (4). A buffer plate (14) is elastically and slidably installed at the lower end of the fixing plate (9), and hydraulic oil (16) is filled between the fixing plate (9) and the buffer plate (14). The upper end of the piston head (4) extends into the interior of the injection device body (2) and abuts against the lower end of the valve assembly (201).

2. The injection device for low-pressure natural gas extraction and transportation according to claim 1, characterized in that, The lower side of the spray device body (2) is symmetrically provided with a first mounting ear (202) with bolt holes. The valve seat body (1) is provided with a second mounting ear (101) corresponding to each first mounting ear (202). Bolts (3) are installed in the bolt holes.

3. The injection device for low-pressure natural gas extraction and transportation according to claim 1, characterized in that, A slide cylinder (5) is fixedly provided at the lower end of the piston head (4), and a matching slide rod (6) is fixedly provided on the fixed plate (9) at the position corresponding to the slide cylinder (5). The slide rod (6) is slidably provided in the slide cylinder (5). A shock-absorbing spring (8) is fixedly provided on the fixed plate (9) and fitted on the slide rod (6). A groove (7) is provided at the lower end of the piston head (4) at the position corresponding to the shock-absorbing spring (8), and the upper end of the shock-absorbing spring (8) is installed in the groove (7).

4. The injection device for low-pressure natural gas extraction and transportation according to claim 1, characterized in that, Multiple support rods (12) are fixedly arranged between the lower end of the fixed plate (9) and the bottom of the valve seat body (1). The buffer plate (14) is provided with a sliding sleeve (13) at the position corresponding to the support rod (12). The buffer plate (14) is slidably arranged inside the valve seat body (1) through the sliding sleeve (13). A buffer spring (15) is also fitted between the support rod (12) and the bottom end of the valve seat body (1).

5. The injection device for low-pressure natural gas extraction and transportation according to claim 4, characterized in that, The valve port of the one-way oil outlet valve (10) faces the piston head (4), and the valve port of the one-way oil inlet valve (11) faces the buffer plate (14) area. The flow rate of the one-way oil outlet valve (10) is greater than the flow rate of the one-way oil inlet valve (11).

6. The injection device for low-pressure natural gas extraction and transportation according to claim 5, characterized in that, The piston head (4) and the buffer plate (14) are both sealed and slide inside the valve seat body (1); the sliding sleeve (13) and the support rod (12) slide in a sealed manner.

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