Coal bed gas wellhead oil injection screw compressor

Abstract

The utility model relates to the technical field of screw compressors, in particular to a coal bed gas wellhead oil injection screw compressor. The coal bed gas wellhead oil injection screw compressor comprises a supporting seat and an oil filter pipe fixedly installed on the supporting seat, and a screw compressor and a power motor used for driving the screw compressor to rotate are installed on the oil filter pipe through a support. The control box is mounted on an outer shell of the power motor and electrically connected with the power motor; the oil filtering mechanism used for oil-gas separation is installed in the oil filtering pipe, the oil filtering mechanism comprises a sealing end cover, the sealing end cover used for sealing the oil filtering pipe is fixedly installed on one side of the oil filtering pipe, and a long guide rod is fixedly installed at the end, stretching into the oil filtering pipe, of the sealing end cover; and the long guide rod is sequentially provided with a separating and filtering cover, a separating cover and a liquid blocking plate from left to right. The coal bed gas wellhead oil injection screw compressor provided by the utility model has the advantage of high oil-gas separation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of screw compressors, in particular to a coalbed methane wellhead oil injection screw compressor. Background Art

[0002] Under the premise that the compressed gas medium and the lubricating oil "do not react" and the lubricating oil can be effectively separated from the medium, engineers have developed oil-filled screw compressors, also known as "oil-injected screws" or "oil-injected screws." Oil-injected screw compressors do not have synchronous gears. The compression chamber is connected to the lubricating oil system and is usually equipped with a sliding valve. This not only adjusts the exhaust pressure to adapt to various operating conditions, but also greatly reduces energy consumption. A dry gas seal is used between the main unit and the main shaft, resulting in a complete lack of wear parts in the entire compressor. The only consumables are lubricating oil and oil filters, which are of common commercially available specifications, resulting in very low operating costs.

[0003] However, when natural gas and other mixed gases are compressed and transported at the coalbed methane wellhead, the existing single oil filter for oil and gas separation has a poor oil and gas separation effect, resulting in impure discharged gas and increased lubricating oil loss.

[0004] Therefore, it is necessary to provide a new coalbed methane wellhead oil injection screw compressor to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a coalbed methane wellhead oil-injection screw compressor.

[0006] The utility model provides a coalbed methane wellhead oil injection screw compressor comprising: a support base, and an oil filter pipe fixedly mounted on the support base, a screw compressor and a power motor for driving the screw compressor to rotate are mounted on the oil filter pipe via a bracket;

[0007] A control box is mounted on the outer housing of the power motor and is electrically connected to the power motor;

[0008] An oil filter mechanism, the oil filter mechanism for oil and gas separation is installed in the oil filter tube, and the oil filter mechanism includes a sealing end cover, the sealing end cover for sealing the oil filter tube is fixedly installed on one side of the oil filter tube, and a long guide rod is fixedly installed on one end of the sealing end cover extending into the oil filter tube, and the long guide rod is provided with a filter cover, a partition cover and a liquid blocking plate from left to right in sequence, and the filter covers are provided with several, and several first air guide holes are opened on the filter covers. A circulating pump is provided on one side of the oil filter tube, one end of the circulating pump is connected to the bottom end of the oil filter tube through a conduit, and the other end of the circulating pump is connected to the oil inlet end of the screw compressor, and the circulating pump is electrically connected to the control box.

[0009] Preferably, the exhaust end of the screw compressor is connected to one end of the oil filter pipe, and the intake end of the screw compressor is connected to an intake valve, and the intake valve is electrically connected to the control box.

[0010] Preferably, the partition covers are provided in a plurality and are staggered in an upper and lower arrangement, and the plurality of partition covers are each provided with a second air guide hole, the aperture of the second air guide hole being smaller than the aperture of the first air guide hole.

[0011] Preferably, a groove is provided on the outer wall of the liquid-blocking plate, a sealing ring is embedded in the groove and contacts and seals with the inner wall of the oil filter tube, and a through hole is provided at the top of the liquid-blocking plate, a filter is embedded in the through hole, and a wire mesh demister is installed on the left side of the long guide rod located on the liquid-blocking plate.

[0012] Preferably, the top end of one side of the oil filter tube is connected to an exhaust pipe, and the exhaust pipe is arranged on the left side of the wire mesh demister.

[0013] Preferably, the bottom end of one side of the oil filter tube is connected to an automatic odorizer.

[0014] Preferably, a plurality of liquid guiding grooves are provided on the filter cover, and the liquid guiding grooves are wide at the top and narrow at the bottom.

[0015] Compared with related technologies, the coalbed methane wellhead oil injection screw compressor provided by the utility model has the following beneficial effects:

[0016] 1. The utility model provides a coalbed methane wellhead oil injection screw compressor. By arranging an oil filter mechanism in the oil filter pipe, the oil filter mechanism utilizes the cooperation of a sealing end cover, a long guide rod, a filter cover, a partition cover, a liquid blocking plate, a sealing ring, a filter screen and a wire mesh demister to facilitate the rapid separation of the compressed oil and gas mixture and improve the purity of the exhaust gas.

[0017] 2. The first air guide holes and liquid guide grooves are arranged on several filter covers to cooperate with each other. When the oil returns to the circulation, the impact on the oil and gas can be improved, and the lubricating oil can be easily returned along the liquid guide groove, so as to stabilize the oil return circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a preferred embodiment of a coalbed methane wellhead oil injection screw compressor provided by the utility model;

[0019] Figure 2 This is a structural schematic diagram of the coalbed methane wellhead oil injection screw compressor provided by the utility model from another perspective;

[0020] Figure 3 This is a structural diagram of an oil filter mechanism installed on the oil filter tube provided by the utility model;

[0021] Figure 4This is a schematic diagram of the structure of the oil filter mechanism provided by the utility model;

[0022] Figure 5 This is a structural schematic diagram of a liquid guide groove provided on the filter cover provided by the utility model.

[0023] Numbers in the figure: 1. Support seat; 2. Oil filter tube; 21. Exhaust pipe; 3. Screw compressor; 31. Inlet valve; 4. Power motor; 5. Control box; 6. Oil filter mechanism; 61. Sealing end cover; 62. Long guide rod; 63. Filter cover; 64. Partition cover; 65. Liquid blocking plate; 651. Sealing ring; 66. Filter screen; 67. Wire mesh demister; 601. First air guide hole; 602. Second air guide hole; 603. Liquid guide tank; 7. Circulation pump; 8. Automatic odorizer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0026] See also Figures 1 to 5 The present invention provides a coalbed methane wellhead oil injection screw compressor, which comprises:

[0027] A support base 1, and an oil filter tube 2 fixedly mounted on the support base 1, wherein a screw compressor 3 and a power motor 4 for driving the screw compressor 3 to rotate are mounted on the oil filter tube 2 via a bracket;

[0028] The control box 5 is mounted on the outer housing of the power motor 4 and is electrically connected to the power motor 4;

[0029] The oil filter mechanism 6, the oil filter mechanism 6 for oil and gas separation is installed in the oil filter tube 2, and the oil filter mechanism 6 includes a sealing end cover 61, the sealing end cover 61 for sealing the oil filter tube 2 is fixedly installed on one side of the oil filter tube 2, and the sealing end cover 61 extends into the oil filter tube 2. One end is fixedly installed with a long guide rod 62, and the long guide rod 62 is provided with a filter cover 63, a partition cover 64 and a liquid blocking plate 65 from left to right. The filter cover 63 is provided with several first air guide holes 601. A circulating pump 7 is provided on one side of the oil filter tube 2, one end of the circulating pump 7 is connected to the bottom end of the conduit oil filter tube 2, and the other end of the circulating pump 7 is connected to the oil inlet end of the screw compressor 3, and the circulating pump 7 is electrically connected to the control box 5.

[0030] The exhaust end of the screw compressor 3 is connected to one end of the oil filter pipe 2 , and the intake end of the screw compressor 3 is connected to an intake valve 31 , and the intake valve 31 is electrically connected to the control box 5 .

[0031] It should be noted that: when in use, the air inlet valve 31 is connected to the air pipe of the coalbed methane wellhead, and then the gas is introduced into the screw compressor 3. At this time, the power motor 4 is started to drive the screw of the screw compressor 3 to rotate, compressing and pressurizing the introduced gas. During pressurization, the circulation pump 7 is started synchronously to continuously transport lubricating oil into the screw compressor 3. The lubricating oil not only lubricates the screw, but also acts as a liquid seal, so that when the screw rotates, the gas input into the screw compressor 3 is compressed. After refueling, the oil-gas mixture is introduced into the oil filter pipe 2 from the exhaust end of the screw compressor 3. During introduction, the oil-gas mixture preferentially impacts several sub-filter covers 63. Several sub-filter covers 63 use the first air guide hole 601 to guide the gas from the first air guide hole 601, and the lubricating oil automatically falls from the sub-filter cover 63 into the bottom end of the oil filter pipe 2. The introduced gas is then filtered twice through the partition cover 64 to achieve comprehensive separation of oil and gas.

[0032] Furthermore, in order to remove bubbles carried in the separated gas, a groove is formed on the outer wall of the liquid-blocking plate 65, in which a sealing ring 651 is embedded to seal against the inner wall of the oil filter tube 2. A through hole is formed at the top of the liquid-blocking plate 65, in which a filter screen 66 is embedded. A wire mesh demister 67 is installed on the left side of the long guide rod 62 located on the liquid-blocking plate 65.

[0033] The top end of one side of the oil filter tube 2 is connected to an exhaust pipe 21 , and the exhaust pipe 21 is arranged on the left side of the wire mesh demister 67 .

[0034] It should be noted that the gas separated by the partition cover 64 is discharged outward from the through-holes of the liquid-blocking plate 65. During the discharge, the bubbles contained in the gas are filtered and eliminated by the filter 66 and the wire mesh demister 67, and then discharged outward from the exhaust pipe 21 on one side of the oil filter tube 2. Here, the position height of the exhaust pipe 21 and the filter 66 must be higher than the liquid level of the maximum oil storage volume in the oil filter tube 2, that is, the maximum oil storage volume liquid level of the oil filter tube 2 must not be higher than the through-holes opened in the liquid-blocking plate 65.

[0035] Furthermore, there are several partition covers 64, which are staggered up and down, and several partition covers 64 are provided with second air guide holes 602. The aperture of the second air guide hole 602 is smaller than the aperture of the first air guide hole 601. In this way, the staggered partition covers 64 can improve the gas barrier and facilitate the gas impact on the partition covers 64 to separate oil and gas.

[0036] In the embodiments of the present invention, please refer to Figure 1 and Figure 2 The bottom end of one side of the oil filter tube 2 is connected to an automatic odorizer 8;

[0037] It should be noted that when the gas after oil and gas separation is discharged from the exhaust pipe 21, the automatic odorizer 8 is started to odorize the discharged gas and then transport it outward. In this way, when the gas is transported through a pipeline, leakage can be quickly smelled and identified.

[0038] In the embodiments of the present invention, please refer to Figures 1 to 5 , the filter cover 63 is provided with a plurality of liquid guide grooves 603, and the liquid guide grooves 603 are wide at the top and narrow at the bottom;

[0039] It should be noted that when the compressed oil-gas mixture impacts the filter cover 63, the gas can be discharged from the first air guide hole 601, and the lubricating oil flows downward from the liquid guide groove 603 of the filter cover 63. The liquid guide groove 603 is wide at the top to accommodate more lubricating oil, and narrow at the bottom so that when the lubricating oil is diverted, the bubbles on the oil surface can be squeezed out.

[0040] Furthermore, in order to better eliminate the bubble, a barb structure may be provided at the bottom end of the liquid guiding groove 603 to puncture the bubble and improve the oil-gas separation.

[0041] The working principle of the coalbed methane wellhead oil injection screw compressor provided by the utility model is as follows:

[0042] During use, the air inlet valve 31 is connected to the air pipe of the coalbed methane wellhead, and then the gas is introduced into the screw compressor 3. At this time, the power motor 4 is started to drive the screw of the screw compressor 3 to rotate, compressing and pressurizing the introduced gas. During pressurization, the circulation pump 7 is started synchronously to continuously transport lubricating oil into the screw compressor 3. The lubricating oil not only lubricates the screw, but also acts as a liquid seal, so that the gas input into the screw compressor 3 is compressed when the screw rotates. After refueling, the oil-gas mixture is introduced into the oil filter pipe 2 from the exhaust end of the screw compressor 3. During the introduction, the oil-gas mixture preferentially impacts a plurality of filter covers 63, and a plurality of filter covers 6 The gas is guided out through the first air guide hole 601, and the lubricating oil automatically falls from the filter cover 63 into the bottom end of the oil filter tube 2. The introduced gas is then filtered through the partition cover 64 for secondary filtration, achieving comprehensive separation of oil and gas. The separated gas is then discharged from the through-holes of the liquid blocking plate 65 after passing through the partition cover 64. During discharge, the air bubbles contained in the gas are filtered and eliminated through the filter screen 66 and the wire mesh demister 67, and then discharged from the exhaust pipe 21 on one side of the oil filter tube 2. During discharge, the automatic odorizer 8 is activated to odorize the discharged gas before it is transported outward. In this way, when transporting the gas through a pipeline, leaks can be quickly detected and identified.

[0043] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0044] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A coalbed methane wellhead oil injection screw compressor, comprising: A support base (1), and an oil filter tube (2) fixedly mounted on the support base (1), wherein a screw compressor (3) and a power motor (4) for driving the screw compressor (3) to rotate are mounted on the oil filter tube (2) via a bracket; A control box (5) is mounted on the outer housing of the power motor (4) and is electrically connected to the power motor (4); It is characterized by further comprising: An oil filter mechanism (6), the oil filter mechanism (6) for oil and gas separation is installed in the oil filter tube (2), and the oil filter mechanism (6) includes a sealing end cover (61), the sealing end cover (61) for sealing the oil filter tube (2) is fixedly installed on one side of the oil filter tube (2), and a long guide rod (62) is fixedly installed on one end of the sealing end cover (61) extending into the oil filter tube (2), and the long guide rod (62) is provided with a filter cover (63) in sequence from left to right. , a partition cover (64) and a liquid blocking plate (65), a plurality of filter covers (63) are provided, and a plurality of first air guide holes (601) are opened on the plurality of filter covers (63), a circulation pump (7) is provided on one side of the oil filter pipe (2), one end of the circulation pump (7) is connected to the bottom end of the oil filter pipe (2) through the conduit, and the other end of the circulation pump (7) is connected to the oil inlet end of the screw compressor (3), and the circulation pump (7) is electrically connected to the control box (5).

2. The coalbed methane wellhead oil injection screw compressor according to claim 1, characterized in that: The exhaust end of the screw compressor (3) is connected to one end of the oil filter tube (2), and the intake end of the screw compressor (3) is connected to an intake valve (31), and the intake valve (31) is electrically connected to the control box (5).

3. The coalbed methane wellhead oil injection screw compressor according to claim 1, characterized in that: The partition covers (64) are provided in a plurality and are staggered in an upper and lower arrangement, and each of the partition covers (64) is provided with a second air guide hole (602), the aperture of the second air guide hole (602) being smaller than the aperture of the first air guide hole (601).

4. The coalbed methane wellhead oil injection screw compressor according to claim 1, characterized in that: The outer wall of the liquid-blocking plate (65) is provided with a groove, in which a sealing ring (651) is embedded for contact and sealing with the inner wall of the oil filter tube (2), and a through hole is provided at the top of the liquid-blocking plate (65), in which a filter screen (66) is embedded, and a wire mesh demister (67) is installed on the left side of the long guide rod (62) located on the liquid-blocking plate (65).

5. The coalbed methane wellhead oil injection screw compressor according to claim 4, characterized in that: The top end of one side of the oil filter tube (2) is connected to an exhaust pipe (21), and the exhaust pipe (21) is arranged on the left side of the wire mesh demister (67).

6. The coalbed methane wellhead oil injection screw compressor according to claim 5, characterized in that: The bottom end of one side of the oil filter tube (2) is connected to an automatic odorizer (8).

7. The coalbed methane wellhead oil injection screw compressor according to claim 1, characterized in that: A plurality of liquid guiding grooves (603) are provided on the filter cover (63), and the liquid guiding grooves (603) are wide at the top and narrow at the bottom.

Images