Liquid inlet valve structure of small-clearance oil-gas multiphase pump

Abstract

The utility model discloses a liquid inlet valve structure of a small-clearance oil-gas multiphase pump, and belongs to the technical field of reciprocating pumps. The two liquid inlet valves are arranged at the two ends of the pump body, the piston is arranged in the pump body and reciprocates between the two liquid inlet valves, the liquid discharging valves correspond to the liquid inlet valves one to one, the liquid discharging valves and the corresponding liquid inlet valves are arranged at the same end of the pump body, and the piston rod penetrates through a valve element of any liquid inlet valve and then is connected with the piston. And the piston rods and the corresponding valve cores can slide relatively. According to the liquid inlet valve structure of the small-clearance oil-gas multiphase pump, the piston rod on one side penetrates through the liquid inlet valve, and the piston rod on the other side is coaxial with the liquid inlet valve, so that the clearance volume of the oil-gas multiphase pump is reduced to the minimum, the volume efficiency of the pump is effectively improved, the performance spectrum of the pump is optimized, and the adaptability of the pump to the gas content of a medium is enhanced; the on-site matching condition of the pump and an oil well is improved, the liquid inlet valves and the liquid outlet valves are arranged at the two ends of the pump body, and therefore medium conveying can be achieved in the reciprocating motion process of the piston, and the working efficiency is improved.

Description

Technical Field

[0001] The invention discloses a liquid inlet valve structure for a small clearance oil-gas mixed transmission pump, belonging to the technical field of reciprocating pumps. Background Art

[0002] A mixture of various substances. These oil and gas mixtures need to be transported to the joint station through pipelines using oil and gas mixed transportation pumps for oil and gas separation and purification.

[0003] Oil and gas gathering and transportation requires very high delivery pressure, and usually a motorized reciprocating pump is used as an oil and gas mixed delivery pump. When the traditional oil and gas mixed delivery pump is working, there is a large clearance volume, which seriously affects the working performance and medium adaptability of the pump. When the gas content of the transported medium is not high, the working efficiency becomes low, and when the gas content of the transported medium is too high, the medium cannot be discharged. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a small clearance oil and gas mixed flow pump inlet valve structure which reduces the clearance volume of the oil and gas mixed flow pump to a minimum and effectively improves the volumetric efficiency of the pump.

[0005] The technical solution adopted by the utility model to solve the technical problem is: the small clearance oil and gas mixed pump liquid inlet valve structure is characterized by comprising a pump body, a piston rod, a piston, a liquid inlet valve and a liquid discharge valve, the liquid inlet valve is arranged at two ends of the pump body, the piston is arranged in the pump body, and the piston reciprocates between the two liquid inlet valves, the liquid discharge valve corresponds to the liquid inlet valve one by one, and is arranged at the same end of the pump body with the corresponding liquid inlet valve, the piston rod passes through the valve core of any one of the liquid inlet valves and is connected to the piston, and the piston rod and the corresponding valve core can slide relatively.

[0006] Preferably, each of the liquid inlet valves is arranged at both ends of the movement trajectory of the piston, and each of the liquid discharge valves is arranged on one side of the movement trajectory of the piston.

[0007] Preferably, the liquid inlet valve is arranged in the inner cavity of the pump body, and divides the inner cavity of the pump body into a central pump cavity and liquid inlet cavities at both ends of the pump cavity. Both ends of the pump body are provided with liquid inlets connected to the liquid inlet cavities on the corresponding sides.

[0008] Preferably, each of the liquid inlets is arranged on one side of the piston movement trajectory.

[0009] Preferably, the end covers at both ends of the pump body are detachably connected to the pump body.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The design of the small clearance oil and gas mixed pump inlet valve structure has a piston rod on one side passing through the inlet valve and a piston rod on the other side being coaxial with the inlet valve, which reduces the clearance volume of the oil and gas mixed pump to a minimum, effectively improves the volumetric efficiency of the pump, optimizes the performance spectrum of the pump, enhances the adaptability of the pump to the gas content of the medium, and improves the on-site matching conditions between the pump and the oil well. Inlet valves and discharge valves are provided at both ends of the pump body, so that the medium can be transported during the reciprocating motion of the piston, thereby improving work efficiency.

[0012] When the inlet valve and the discharge valve are both arranged on both sides of the piston movement trajectory, a large space needs to be left between the inlet valve and the discharge valve and the piston to ensure smooth operation, which results in a large clearance volume during operation; and when the inlet valve and the discharge valve are both arranged at the same end of the pump body, firstly, the inlet valve and the discharge valve must also leave space compared with the piston moving to the end point of the stroke, which results in a large clearance volume, and secondly, the installation space of the inlet valve and the discharge valve is limited, which leads to a slow speed of sucking and discharging the medium. The valve core of the intake and exhaust structure of the reciprocating pump is slidably connected to the piston rod, and when the piston moves to the end point of the stroke, the surface of the valve core is extremely small, the working clearance volume is very small, and the discharge valve does not need to be arranged on the same end face of the pump body as the inlet valve, so as to avoid limiting the installation space of the inlet valve and the discharge valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the main cross-sectional view of the liquid inlet valve structure of a small clearance oil-gas mixed transmission pump.

[0014] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0015] In the figure: 1, pump body 101, pump chamber 102, liquid inlet chamber 103, liquid inlet port 2, piston rod 3, piston 301, boss 4, liquid inlet valve 401, valve body 4011, annular groove 402, valve core 403, support sleeve 4031, annular platform 404, sealing spring 405, retaining ring 406, liquid inlet channel 407, sealing part 5, and liquid discharge valve. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention necessarily exceeds these limited embodiments. For some equivalent replacement schemes or common means, they are no longer described in detail herein, but still fall within the scope of protection of the present application.

[0017] Figures 1-2 It is the best embodiment of the utility model, and the following Figures 1-2 The utility model is further described.

[0018] A liquid inlet valve structure of a small clearance oil-gas mixed pump comprises a pump body 1, a piston rod 2, a piston 3, a liquid inlet valve 4 and a liquid discharge valve 5. The liquid inlet valve 4 has two valves arranged at both ends of the pump body 1. The piston 3 is arranged in the pump body 1, and the piston 3 reciprocates between the two liquid inlet valves 4. The liquid discharge valve 5 corresponds to the liquid inlet valve 4 one by one and is arranged at the same end of the pump body 1 as the corresponding liquid inlet valve 4. The piston rod 2 passes through the valve core 402 of any one of the liquid inlet valves 4 and is connected to the piston 3. The piston rod 2 and the corresponding valve core 402 can slide relative to each other. The design of the small clearance oil and gas mixed pump inlet valve structure, in which the piston rod 2 on one side passes through the inlet valve 4 and the piston rod 2 on the other side is coaxial with the inlet valve 4, reduces the clearance volume of the oil and gas mixed pump to a minimum, effectively improves the volumetric efficiency of the pump, optimizes the performance spectrum of the pump, enhances the adaptability of the pump to the gas content of the medium, and improves the on-site matching conditions between the pump and the oil well. Inlet valves and discharge valves are provided at both ends of the pump body, so that the medium can be transported during the reciprocating motion of the piston, thereby improving work efficiency.

[0019] Specific: such as Figure 1-2 As shown: the liquid inlet valve 4 is arranged in the inner cavity of the pump body 1, and the inner cavity of the pump body 1 is divided into a liquid inlet cavity 102 and a pump cavity 101. A liquid inlet port 103 is arranged on one side of the liquid inlet cavity 102. There are two liquid inlet valves 4 arranged at both ends of the pump body 1, and liquid inlet cavities 102 are formed at both ends of the pump body 1, and a liquid inlet port 103 is arranged on one side of each liquid inlet cavity 102. The piston 3 is arranged in the pump cavity 101, and when the piston 3 reciprocates in the pump cavity 101, the working efficiency is higher.

[0020] The discharge valve 5 corresponds to the inlet valve 4 one by one. The discharge valve 5 and the corresponding inlet valve 4 are arranged at the same end of the pump chamber 101. The discharge valve 5 is arranged on one side of the movement trajectory of the piston 3. The discharge valve 5 is connected to the corresponding end of the pump chamber 101. The end face of the pump chamber 101 is opposite to the edge of the input port of the discharge valve 5 on the corresponding side, thereby further reducing the working clearance.

[0021] The inlet valve 4 is arranged on the end surface of the pump chamber 101, the groove is arranged on the inlet valve 4, and the outer convex part is a boss 301 arranged on the end surface of the piston 3, and the boss 301 is arranged coaxially with the piston 3. In this embodiment, the boss 301 is arranged on the outer edge of the piston 3.

[0022] The outer side of the groove is inclined so that the width of the groove gradually widens from the inside to the outside. When the piston 3 moves toward the direction close to the inlet valve 4, the medium will gradually be discharged from the discharge valve 5 on the corresponding side. When the piston 3 moves to the end of the pump chamber 101 on the corresponding side, as the piston 3 continues to move, the medium is gradually discharged outward and enters the groove. As the piston 3 moves again, the boss 301 will enter the groove and cause the medium in the groove to be discharged through the discharge valve 5, thereby greatly reducing the working clearance.

[0023] In this embodiment, the diameter of the piston 3 is greater than the length of the piston 3, so that the piston 3 forms a wide piston structure, further reducing the clearance.

[0024] The inlet valve 4 and the discharge valve 5 can adopt existing check valves. In the present embodiment, the inlet valve 4 is coaxial with the piston 3, the piston rod 2 passes through the valve core of any inlet valve 4 and extends into the pump chamber 101, and is fixedly connected with the piston 3 in the pump chamber 101, the valve core and the piston rod 2 can slide relative to each other, and a seal is arranged between the piston rod 2 and the valve core.

[0025] The right end of the piston rod 2 passes through the liquid inlet cavity and the valve core 402 of the liquid inlet valve 4, and is connected to the piston 3 in the pump cavity, and drives the piston 3 to reciprocate. The liquid inlet 101 is arranged on one side of the motion track of the piston rod 2 to avoid mutual interference with the piston rod 2. In this embodiment, the liquid inlet 101 is arranged at the bottom of the pump body 1, and the liquid inlet 101 is connected to the liquid inlet cavity, and the medium is sucked into the liquid inlet cavity through the liquid inlet 101.

[0026] The structures of the liquid inlet valves 4 at both ends are the same, and the only difference is the valve core, that is, the valve core 402 of the left liquid inlet valve 4 is provided with a through hole for the piston rod 2 to pass through, while the valve core 402 of the right liquid inlet valve 4 is not provided with a through hole for the piston rod 2 to pass through. In this embodiment, the structure of the liquid inlet valve 4 on the left is taken as an example to explain the structure of the liquid inlet valve 4.

[0027] The liquid inlet valve 4 includes a valve body 401 , a valve core 402 , a sealing spring 404 and a support sleeve 403 .

[0028] The valve body 401 is installed in the pump body 1, and the valve body 401 is located between the liquid inlet cavity 102 and the pump cavity 101. A guide hole is provided in the middle of the valve body 401, and a liquid inlet flow channel 406 is provided on the side of the pump body 401 to connect the liquid inlet cavity with the pump cavity. A plurality of liquid inlet flow channels 406 are evenly spaced around the guide hole. The right end surface of the pump body 401 is provided with an inner concave portion whose diameter gradually increases from left to right, and the right end surface of the liquid inlet flow channel 406 is located in the inner concave portion.

[0029] The diameter of the right end of the valve core 402 is larger than that of the left end, and a sealing portion 407 is formed at the right end of the valve core 402. The diameter of the left end of the sealing portion 407 gradually decreases from right to left. The left end of the valve core 402 can slide through the guide hole of the valve body 401 and extend into the liquid inlet cavity 102.

[0030] A through hole for the piston rod 2 to pass through is provided in the middle of the valve core 402. The piston rod 2 can slide through the through hole of the valve core 402 and extend into the pump chamber 101. A sealing ring is provided between the piston rod 2 and the valve core 402 to avoid leakage between the piston rod 2 and the valve core 402.

[0031] The support sleeve 403 is sleeved on the outer side of the left end of the valve core 402, and the support sleeve 403 and the valve core 402 are detachably connected. In this embodiment, the support sleeve 403 and the valve core 402 are threadedly connected.

[0032] The left end of the valve core 402 is provided with a connecting portion with a diameter smaller than the middle diameter. The support sleeve 403 is threadedly connected to the connecting portion of the valve core 402. A retaining ring 405 is installed at the left end of the valve core 402, and the retaining ring 405 is located on the left side of the support sleeve 403.

[0033] An outwardly convex annular platform 4031 is provided around the outer wall of the left end of the support sleeve 403, an annular groove 4011 is provided around the left end surface of the valve body 401, a sealing spring 404 is sleeved on the outer side of the valve core 402, and the sealing spring 404 is located between the annular platform 4031 and the annular groove 4011. The sealing spring 404 is in a compressed state and pushes the valve core 402 to move leftward, so that the sealing part 407 presses the inner concave part of the valve body 401. The right end of the sealing spring 404 extends into the annular groove 4011.

[0034] The piston rod 2 of the intake and exhaust structure of the reciprocating pump drives the piston 3 to reciprocate. When the piston 3 moves, the discharge valve 5 on the rear side of the movement direction is closed, and the inlet valve 4 on the rear side of the movement direction is opened. The medium enters the inlet cavity 102 through the inlet port 103 on the corresponding side, and enters the pump cavity 101 on the left side of the piston 3 through the inlet cavity 102. When the piston 3 moves in the reverse direction, the inlet valve 4 on the front side of the movement direction is closed, and the discharge valve 5 on the front side of the movement direction is opened, and the piston 3 presses the medium out through the discharge valve 5. The discharge valve 5 can be an existing check valve.

[0035] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A small clearance oil-gas mixed pump inlet valve structure, characterized by: The invention comprises a pump body (1), a piston rod (2), a piston (3), a liquid inlet valve (4) and a liquid discharge valve (5), wherein two liquid inlet valves (4) are arranged at both ends of the pump body (1), the piston (3) is arranged in the pump body (1), and the piston (3) reciprocates between the two liquid inlet valves (4), the liquid discharge valve (5) corresponds to the liquid inlet valve (4) one by one, and is arranged at the same end of the pump body (1) as the corresponding liquid inlet valve (4), the piston rod (2) passes through the valve core (402) of any one of the liquid inlet valves (4) and is connected to the piston (3), and the piston rod (2) and the corresponding valve core (402) can slide relative to each other.

2. The small clearance oil-gas mixed pump inlet valve structure according to claim 1 is characterized in that: Each of the liquid inlet valves (4) is arranged at both ends of the movement trajectory of the piston (3), and each of the liquid discharge valves (5) is arranged on one side of the movement trajectory of the piston (3).

3. The small clearance oil-gas mixed pump inlet valve structure according to claim 1 or 2, characterized in that: The liquid inlet valve (4) is arranged in the inner cavity of the pump body (1), and divides the inner cavity of the pump body (1) into a pump cavity (101) in the middle and liquid inlet cavities (102) at both ends. Both ends of the pump body (1) are provided with liquid inlets (103) that are in communication with the liquid inlet cavities (102) on the corresponding side.

4. The small clearance oil-gas mixed pump inlet valve structure according to claim 3 is characterized in that: Each of the liquid inlets (103) is arranged on one side of the movement trajectory of the piston (3).

5. The small clearance oil-gas mixed pump inlet valve structure according to claim 1 is characterized in that: The end covers at both ends of the pump body (1) are detachably connected to the pump body (1).

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