Pressure limiting valve for natural gas compressor

Abstract

The pressure limiting valve is installed on a diaphragm pump head and comprises a pressure limiting valve body, a valve body outer shell and a connecting elbow which are sequentially connected, the pressure limiting valve body is fixed on the inner side of the valve body outer shell, the interior of the pressure limiting valve body is of a cavity structure and serves as a base inner cavity, and the connecting elbow is connected with the valve body outer shell. A pressure limiting plug is fixed in the valve body shell, a spring is arranged at one end of the pressure limiting plug, the pressure limiting plug is fixedly connected with the valve body shell through the spring, and the other end of the pressure limiting plug abuts against the end of the inner cavity of the base. By improving an existing structure, the diaphragm pump head can be better fixed to the diaphragm pump head, it can be ensured that the fixing depth of connecting threads meets the requirement, and overall connection is stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas development, in particular to the technical field of natural gas production equipment, and specifically relates to a pressure limiting valve for a natural gas compressor. Background Art

[0002] Natural gas extraction needs to deal with related pollution issues, especially the problem of tail gas emissions. Sulfur-containing tail gas is one of the biggest difficulties in handling. Now many natural gas processing plants have adopted a solution to replace the original incineration solution and use the sulfur-containing tail gas from the desulfurization device for pressurized recovery and treatment. Generally, it is more convenient to use a flash steam booster skid for treatment. The diaphragm pump is the main device of the common booster skid and provides a greater role in boosting. The pressure limiting valve is an important component to ensure the safe use of the diaphragm pump. The existing pressure limiting valves generally use oil pressure limiting valves, and the fixing method is generally to fix them to the side of the diaphragm pump with bolts. However, due to the extremely high internal pressure of the diaphragm pump and the long-term vibration state of the device, there is still a certain risk of loosening if only threaded fixing is used. Utility Model Content

[0003] In view of the above problems, the utility model provides a pressure limiting valve for a natural gas compressor, which improves the existing structure so that it can be better fixed on the diaphragm pump head, and can ensure that the fixing depth of the connecting thread meets the requirements and the overall connection is stable.

[0004] The specific scheme of the utility model is as follows:

[0005] A pressure limiting valve for a natural gas compressor is installed on a diaphragm pump head, and includes a pressure limiting valve body, a valve body shell, and a connecting elbow which are connected in sequence, wherein the pressure limiting valve body is fixed on the inner side of the valve body shell, the interior of the pressure limiting valve body is a cavity structure serving as a base inner cavity, a pressure limiting plug is fixed inside the valve body shell, one end of the pressure limiting plug is provided with a spring and is fixedly connected to the valve body shell through the spring, and the other end abuts against the end of the base inner cavity.

[0006] Furthermore, at least two through holes are provided on the valve body shell, and the corresponding pressure-limiting valve body is also provided with threaded holes with the same number as those on the valve body shell 11, which are fixed by fixing bolts passing through the valve body shell and fixed to the valve body base; a circle of sealing grooves are provided on the upper and lower sides of the threaded holes of the pressure-limiting valve body, and sealing O-rings are installed in the sealing grooves to achieve sealing.

[0007] Furthermore, the valve body base is provided with a connecting thread at the position where it is connected to the diaphragm pump head, and a circle of sealing ring fixing ring is provided at the end of the connecting thread, and a sealing ring is installed on the side of the sealing ring fixing ring facing the connecting thread, and on the outside of the sealing ring fixing ring, two rods extending outward are provided as auxiliary fixing ring mounting blocks, and the auxiliary fixing ring mounting block is provided with a mounting groove for fixing the auxiliary fixing ring, and the auxiliary fixing ring is sleeved on the diaphragm pump head.

[0008] Furthermore, a spring mounting frame is provided at one end of the spring, the spring mounting frame is fixed to the pipeline opening of the valve body shell, and the spring mounting frame leaves a space for the fluid to pass through and enter the connecting elbow.

[0009] Furthermore, the spring is a coil spring or a butterfly spring, and the outer diameter of the spring is smaller than the outer diameter of the pipeline opening of the valve body shell.

[0010] Furthermore, the end of the pressure limiting plug is conical and the top is an arc-shaped structure, and the end of the base inner cavity of the valve body base connected to the pressure limiting plug is a conical groove, and the taper is the same as that of the pressure limiting plug.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The improved pressure limiting valve structure can effectively ensure the stability of the connection and improve the connection accuracy and convenience of the structure.

[0013] 2. Through the design of the internal structure, the overall use is made more stable, and the uncertainty of the connection effect caused by the vibration of the skid-mounted equipment itself is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the installation structure of the utility model in use.

[0015] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0016] In the figure:

[0017] 1 diaphragm pump head, 2 pressure limiting valve body, 3 auxiliary fixing ring, 4 valve body base, 5 base inner cavity, 6 connecting thread, 7 sealing ring fixing ring, 8 auxiliary fixing ring mounting block, 9 mounting groove, 10 sealing ring, 11 valve body shell, 12 fixing bolt, 13 sealing O-ring, 14 pressure limiting plug, 15 spring, 16 spring mounting frame, 17 connecting elbow. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-2 A pressure limiting valve for a natural gas compressor is an oil pressure limiting valve installed on a diaphragm pump head 1, comprising a pressure limiting valve body 2, a valve body shell 11, and a connecting elbow 17 connected in sequence, wherein the pressure limiting valve body 2 is fixed on the inner side of the valve body shell 11, and the interior of the pressure limiting valve body 2 is a cavity structure, serving as a base inner cavity 5, and a pressure limiting plug 14 is fixed inside the valve body shell 11, and one end of the pressure limiting plug 14 is provided with a spring 15 and is fixedly connected to the valve body shell 11 through the spring 15, and the other end abuts against the end of the base inner cavity 5. Through the thrust of the spring 15, the pressure limiting plug 14 is blocked at the end of the base inner cavity 5 under normal circumstances, thereby preventing the oil in the diaphragm pump 1 from flowing out, and when the internal oil pressure exceeds the set value, the pressure limiting plug 14 is pushed open, and enters the connecting elbow 17 through the flow channel in the valve body shell 11 to flow away, thereby realizing pressure leakage and avoiding risks.

[0020] The valve body shell 11 is provided with at least two through holes, preferably four, and the corresponding pressure limiting valve body 2 is also provided with threaded holes of the same number as the valve body shell 11, and the valve body shell 11 is fixed to the valve body base 4 through the matching number of fixing bolts 12; a circle of sealing grooves are provided on both the upper and lower sides of the threaded holes of the pressure limiting valve body 2, and sealing O-rings 13 are installed in the sealing grooves to achieve sealing. Such a design can avoid leakage.

[0021] The valve body base 4 is provided with a connecting thread 6 at the position connected to the diaphragm pump head 1, and a circle of sealing ring fixing ring 7 is provided at the end of the connecting thread 6. A sealing ring 10 is installed on the side of the sealing ring fixing ring 6 facing the connecting thread 6. When the connecting thread 6 is fixed on the diaphragm pump head 1, the sealing is achieved by the compression of the sealing ring 10. On the outside of the sealing ring fixing ring 7, two rods extending outward are provided as auxiliary fixing ring mounting blocks 8. A mounting groove 9 is provided on the auxiliary fixing ring mounting block 8 for fixing the auxiliary fixing ring 3. The auxiliary fixing ring 3 is sleeved on the diaphragm pump head. The auxiliary fixing ring 3 is a common metal clamp structure. On the other hand, the auxiliary fixing ring mounting block 8 also plays a role in guiding the installation in place. When the fixing ring mounting block 8 is rotated to keep the axial consistency with the diaphragm pump head 1, and the connecting thread 6 cannot be rotated further, it can be judged that it has been tightened in place, thereby avoiding the effect of not rotating in place or over-rotating affecting the life of the thread.

[0022] One end of the spring 15 is provided with a spring mounting frame 16, which is fixed to the pipe opening of the valve body shell 11, and the spring mounting frame 16 leaves a space for the fluid to pass through and enter the connecting elbow 17. The spring 15 is a coil spring or a butterfly spring. And the outer diameter of the spring 15 is smaller than the outer diameter of the pipe opening of the valve body shell. There are certain advantages in using both types of springs, such as the coil spring has better permeability and the butterfly spring is more pressure-resistant, and they can be selected according to needs.

[0023] The end of the pressure limiting plug 14 is conical and the top is an arc-shaped structure. The end of the base inner cavity 5 of the valve body base 4 connected to the pressure limiting plug 14 is a conical groove, and the taper is the same as that of the pressure limiting plug 14.

[0024] The method of using the utility model is as follows:

[0025] The utility model is installed in place, that is, the direction of the fixing ring mounting block 8 is consistent with the axial direction of the diaphragm pump head 1 and tightened, and then the auxiliary fixing ring 3 is respectively sleeved in the mounting grooves 9 of the two fixing ring mounting blocks 8, so as to achieve the guidance of installation in place and add a fixing structure to ensure the effect of stable connection.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure limiting valve for a natural gas compressor, mounted on a diaphragm pump head (1), characterized in that: The invention comprises a pressure-limiting valve body (2), a valve body shell (11), and a connecting elbow (17) which are connected in sequence, wherein the pressure-limiting valve body (2) is fixed on the inner side of the valve body shell (11), the interior of the pressure-limiting valve body (2) is a cavity structure serving as a base inner cavity (5), a pressure-limiting plug (14) is fixed inside the valve body shell (11), one end of the pressure-limiting plug (14) is provided with a spring (15) and is fixedly connected to the valve body shell (11) via the spring (15), and the other end abuts against the end of the base inner cavity (5).

2. A pressure limiting valve for a natural gas compressor according to claim 1, characterized in that: The valve body shell (11) is provided with at least two through holes, and the corresponding pressure-limiting valve body (2) is also provided with threaded holes having the same number as that on the valve body shell (11), through which fixing bolts (12) pass through the valve body shell (11) and are fixed to the valve body base (4) for fixation; a circle of sealing grooves is provided on both upper and lower sides of the threaded holes of the pressure-limiting valve body (2), and sealing O-rings (13) are installed in the sealing grooves for sealing.

3. A pressure limiting valve for a natural gas compressor according to claim 2, characterized in that: The valve body base (4) is provided with a connecting thread (6) at a position where it is connected to the diaphragm pump head (1); a sealing ring fixing ring (7) is provided at the end of the connecting thread (6); a sealing ring (10) is installed on the side of the sealing ring fixing ring (7) facing the connecting thread (6); two rods extending outward are provided on the outer side of the sealing ring fixing ring (7) as auxiliary fixing ring mounting blocks (8); a mounting groove (9) is provided on the auxiliary fixing ring mounting block (8) for fixing the auxiliary fixing ring (3); and the auxiliary fixing ring (3) is sleeved on the diaphragm pump head.

4. The pressure limiting valve for a natural gas compressor according to claim 1, characterized in that: A spring mounting frame (16) is provided at one end of the spring (15). The spring mounting frame (16) is fixed to the pipe opening of the valve body housing (11), and the spring mounting frame (16) leaves a space for fluid to pass through and enter the connecting elbow (17).

5. A pressure limiting valve for a natural gas compressor according to claim 4, characterized in that: The spring (15) is a coil spring or a butterfly spring, and the outer diameter of the spring (15) is smaller than the outer diameter of the pipeline opening of the valve body shell.

6. The pressure limiting valve for a natural gas compressor according to claim 1, characterized in that: The end of the pressure limiting plug (14) is conical, and the top is an arc-shaped structure, and the end of the base inner cavity (5) of the valve body base (4) connected to the pressure limiting plug (14) is a conical groove, and the taper is the same as the taper of the pressure limiting plug (14).

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