CN215444617U

CN215444617U - Non-backpressure liquid return system and large-flow plunger pump

Info

Publication number: CN215444617U
Application number: CN202121906222.1U
Authority: CN
Inventors: 杜建华; 何珊; 董士刚; 杨淑芳
Original assignee: Beijing Huahai Machinery Co ltd
Current assignee: Beijing Huahai Machinery Co ltd
Priority date: 2021-01-29
Filing date: 2021-08-13
Publication date: 2022-01-07
Anticipated expiration: 2031-08-13
Also published as: CN113653946A

Abstract

The utility model belongs to the technical field of coal mining and specifically relates to a no back pressure returns liquid system and large-traffic plunger pump is related to, and no back pressure returns liquid system and is used for carrying out the power device who collects the emulsion that flows out at hydraulic support liquid outlet department including setting up the liquid return case, the intercommunication returns the liquid pipe between liquid return case and emulsion pump station and setting up on returning the liquid pipe and be used for carrying the emulsion in the liquid return case to the emulsion pump station through returning the liquid pipe. The hydraulic support has the on-way resistance that meets when the emulsion returns liquid can be overcome, and the effect of normal liquid return and work of the hydraulic support is ensured.

Description

Non-backpressure liquid return system and large-flow plunger pump

Technical Field

The application relates to the field of coal mining, in particular to a backpressure-free liquid return system and a large-flow plunger pump.

Background

In the coal mining process, a large amount of hydraulic execution equipment is needed to work, and the hydraulic execution equipment is equipment driven to operate by using hydraulic pressure, such as: the hydraulic support is one of important hydraulic execution devices of the coal fully mechanized mining face. Taking the hydraulic support as an example, the power source of the hydraulic support is that the emulsion in an emulsion pump station is conveyed through a liquid supply pipeline to meet the power requirement of the hydraulic support. In the actual use process, the emulsion pump conveys the emulsion in the emulsion box to the hydraulic support of the working face through the liquid inlet pipe to realize remote liquid supply, and meanwhile, the emulsion in the hydraulic support is conveyed back to the emulsion pump station through the liquid return pipe.

The flow of the emulsion flowing from the hydraulic support to the emulsion pump station is not constant, the emulsion completely flows back to the emulsion pump station by the flow of the hydraulic support, and the emulsion pump station is far away from the hydraulic support, so that when the height difference occurs between the emulsion pump station and the hydraulic support, the emulsion forms back pressure in the liquid return pipe, the on-way resistance during the emulsion return is increased, the normal return of the emulsion on the hydraulic support is influenced, and the normal work of the hydraulic support is influenced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the on-way resistance when the emulsion returns the liquid, ensure hydraulic support's normal liquid and work of returning, this application provides a no back pressure liquid system that returns.

In a first aspect, the present application provides a backpressure-free liquid return system, which adopts the following technical scheme:

the utility model provides a no back pressure returns liquid system, is used for carrying out the liquid case that returns that collects to the emulsion that hydraulic support flows including setting up in hydraulic support liquid outlet department, intercommunication return the liquid pipe between liquid case and emulsion pump station and set up and be used for on returning the liquid pipe to carry the power device to the emulsion pump station through returning the liquid pipe with the emulsion in the liquid case back.

Through adopting above-mentioned technical scheme, during the liquid return, the emulsion that flows from hydraulic support will arrive the liquid return incasement, can collect the emulsion through the liquid return case, then can carry the emulsion of liquid return incasement to the emulsion pump station through power device to on-way resistance when overcoming the emulsion liquid return makes hydraulic support liquid outlet department not have the backpressure phenomenon, guarantees hydraulic support's normal liquid return and work.

Optionally, the power device is a high-flow plunger pump, and the high-flow plunger pump is configured to adjust the flow rate thereof according to the amount of emulsion in the liquid return tank.

By adopting the technical scheme, the large-flow plunger pump can adjust the flow according to the amount of the emulsion in the liquid return tank, when the amount of the emulsion in the liquid return tank is large, the flow is increased, and the emulsion in the liquid return tank can be discharged in time; when the amount of the emulsion in the liquid return tank is less, the flow is reduced, and the phenomenon that the motor of the plunger pump is burnt out due to idling of the large-flow plunger pump can be avoided.

Optionally, a liquid level detection device is installed in the liquid return tank, and the liquid level detection device is used for detecting the amount of emulsion in the liquid return tank.

By adopting the technical scheme, the emulsion amount in the liquid return tank can be detected through the liquid level detection device, so that the flow of the large-flow plunger pump is controlled.

Optionally, the rigid coupling of liquid return case lateral wall department has communicating pipe, keep away from communicating pipe the one end of liquid return case upwards extends, liquid level detection device is including installing the level gauge of communicating pipe inner wall department.

Through adopting above-mentioned technical scheme, because communicating pipe and return liquid case intercommunication, so go up the liquid level communicating pipe highly will be unanimous with the liquid level height on returning the liquid case, can detect the liquid level height on communicating pipe through the level gauge to can obtain the liquid level height of returning liquid case department. And because the liquid level height in the liquid case returns through indirect detection communicating pipe when detecting, so when emulsion on the hydraulic support returns back to liquid case and causes the fluctuation to the liquid level in the liquid case that returns, and can not too much influence the liquid level of communicating pipe, detect more accurately.

Optionally, the communicating pipe is integrally L-shaped, and one end of the communicating pipe, which is far away from the liquid return tank, is vertically and upwards arranged.

By adopting the technical scheme, the liquid level meter can be conveniently installed in the communicating pipe, and the installation is more convenient.

Optionally, the rigid coupling of liquid return case lateral wall department has the installation pipe, the installation pipe level sets up, liquid level detection device is including installing pressure sensor in the installation pipe, pressure sensor is used for detecting the pressure that liquid return bottom of the case portion bore is in order to obtain the emulsion volume in the liquid return case.

Through adopting above-mentioned technical scheme, because the installation pipe communicates with the liquid return case, so the pressure in the installation pipe is also unanimous with the pressure of liquid return incasement, through detecting the indirect pressure to the liquid return incasement of the pressure in the installation pipe and detecting, greatly reduced because the emulsion on the hydraulic support flows back to and causes the pressure fluctuation and influence the data that detect when the liquid return incasement, when there is new emulsion, the pressure fluctuation in the installation pipe is less. Through the indirect pressure that detects in the liquid case that returns of pressure in the detection installation pipe, and then reachs the emulsion volume in the liquid case that returns, it is more accurate to detect data.

Optionally, the motor of the large-flow plunger pump is a variable-frequency all-in-one machine.

Through adopting above-mentioned technical scheme, the motor speed of self can be adjusted according to the emulsion volume in the liquid case that returns to the frequency conversion all-in-one, and it is more convenient to operate.

Optionally, the power device further comprises a frequency converter, and the frequency converter is electrically connected with a motor of the high-flow plunger pump.

By adopting the technical scheme, the rotating speed of the motor on the large-flow plunger pump can be adjusted through the frequency converter, so that the flow of the large-flow plunger pump is adjusted.

In a second aspect, the present application provides a large flow plunger pump, which adopts the following technical scheme:

a large-flow plunger pump comprises a pump body and an external lubricating loop which is positioned on one side of the pump body and supplies lubricating oil to the interior of the pump body.

Through adopting above-mentioned technical scheme, external lubrication circuit can provide the lubrication for the pump body is inside, the lubrication degree of the guarantee pump body, avoids burning out the pump body because its self built-in lubrication is not enough when the pump body rotational speed is less.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the arrangement of the liquid return box and the power device can collect the emulsion flowing out of the hydraulic support and then convey the emulsion to the emulsion pump station through the power device, so that the on-way resistance in the emulsion return process is overcome, and the normal liquid return and work of the emulsion on the hydraulic support are ensured;

2. the communicating pipe is arranged, so that when the height of the emulsion in the liquid return box is detected, the condition that the detection result fluctuates due to the fluctuation of the emulsion in the liquid return box can be reduced;

3. the setting of liquid level detection device can carry out real-time detection to the emulsion volume of returning the liquid incasement to the flow of large-traffic plunger pump of automatic control satisfies the liquid return work of emulsion under the different flow, and the operation is more nimble.

Drawings

Fig. 1 is a schematic structural diagram of the entire liquid return system of the present application.

FIG. 2 is a schematic diagram of an exemplary configuration of a liquid level sensing apparatus.

FIG. 3 is a schematic diagram of another exemplary configuration of a liquid level sensing device.

Fig. 4 is a schematic diagram for embodying the principle of the conventional plunger pump.

FIG. 5 is a schematic diagram of an external lubrication circuit embodying the present invention.

Description of reference numerals: 1. a liquid return tank; 2. a liquid return pipe; 3. a power plant; 31. a high flow plunger pump; 311. a pump body; 312. an external lubrication loop; 3121. a lubrication pump; 3122. a connecting pipe; 4. a liquid level detection device; 41. a liquid level meter; 42. a communicating pipe; 43. a pressure sensor; 44. installing a pipe; 61. a crankshaft; 62. a connecting rod; 63. a slider; 64. a pump chamber; 65. a liquid suction valve; 66. and a drain valve.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses no back pressure returns liquid system. Referring to fig. 1, the liquid return system comprises a liquid return tank 1 arranged at a liquid outlet of the hydraulic support and used for collecting the emulsion flowing out of the hydraulic support, a liquid return pipe 2 communicated between the liquid return tank 1 and the emulsion pump station, and a power device 3 arranged on the liquid return pipe 2 and used for conveying the emulsion in the liquid return tank 1 to the emulsion pump station through the liquid return pipe 2. During the use, the emulsion that flows from hydraulic support can directly flow to and is collected in returning the liquid case 1, then power device 3 can flow back to the emulsion pump station for the emulsion from returning liquid case 1 and provide power to make the emulsion overcome the on-way resistance of returning the liquid in-process, be convenient for the emulsion smooth and easy flow back to in the emulsion pump station, guarantee the normal liquid that returns of last emulsion of hydraulic support, can not cause the influence to hydraulic support's normal work.

Wherein, power device 3 can select large-traffic plunger pump 31, and it can be for the smooth emulsion that flows back in the liquid return tank 1 to the emulsion pump station provides power. The large-flow plunger pump 31 is configured to be capable of adjusting its own flow rate according to the amount of emulsion in the liquid return tank 1, specifically, a liquid level detection device 4 for detecting the amount of emulsion in the liquid return tank 1 is installed on the liquid return tank 1, and the liquid level detection device 4 is connected with a frequency converter of the large-flow plunger pump 31 through a PLC controller. The emulsion amount in the liquid return box 1 can be detected through the liquid level detection device 4, and the PLC controller automatically controls the flow of the large-flow plunger pump 31 according to the numerical value of the emulsion amount detected by the liquid level detection device 4, so that automatic control and adjustment are realized, and the operation is more flexible.

The motor on the large-flow plunger pump 31 can be a variable-frequency all-in-one machine, and the rotating speed of the motor can be adjusted according to the amount of emulsion in the liquid return tank 1, so that the flow can be adjusted; of course, the motor on the large-flow plunger pump 31 may also be a common variable frequency motor, at this time, a frequency converter for adjusting the rotation speed of the motor on the large-flow plunger pump 31 is required to be installed, the PLC controller is connected with the frequency converter, and the rotation speed of the motor on the large-flow plunger pump 31 can be controlled through the frequency converter, so as to adjust the flow of the large-flow plunger pump 31.

Referring to fig. 1, the liquid level detection device 4 includes a liquid level meter 41 for detecting the amount of emulsion in the liquid return tank 1.

In one example of the present application, the level gauge 41 is installed at the inner wall of the liquid return tank 1, and the amount of emulsion in the liquid return tank 1 can be detected in real time by the level gauge 41. But the emulsion flowing out of the hydraulic support reaches the liquid return tank 1, so that the emulsion in the liquid return tank 1 oscillates and fluctuates, and the detection of the liquid level meter 41 is inaccurate. And the PLC controller connected with the liquid level meter 41 also controls the large-flow plunger pump 31 to circularly adjust the flow of the large-flow plunger pump 31, so that the large-flow plunger pump 31 is damaged.

Therefore, referring to fig. 2, in another example of the present application, a communication pipe 42 is fixedly connected to a side wall of the liquid return tank 1, the communication pipe 42 is generally L-shaped, one end of the communication pipe is fixedly connected to a lower portion of the liquid return tank 1 and is communicated with the inside of the liquid return tank 1, the other end of the communication pipe is vertically disposed upward, and the liquid level gauge 41 is mounted on an inner wall of the pipe where the communication pipe 42 is vertically disposed. Due to the principle of the communicating vessel, the emulsion will also flow into the communicating pipe 42, and the height of the emulsion in the communicating pipe 42 coincides with the height of the emulsion in the return tank 1. When the emulsion that flows out of hydraulic support flows to in returning the liquid case 1, when leading to the emulsion shock fluctuation in returning the liquid case 1, the emulsion height fluctuation in communicating pipe 42 will be less for level gauge 41 detects more accurately, and the probability of its flow is adjusted in the circulation of the large-traffic plunger pump 31 of greatly reduced.

Referring to fig. 3, in another example of the present application, the liquid level detection device 4 includes a pressure sensor 43 for detecting the pressure generated by the emulsion in the liquid return tank 1, and the pressure sensor 43 can detect the pressure value generated by the emulsion in the liquid return tank 1, so as to obtain the height value of the emulsion in the liquid return tank 1, that is, the amount of the emulsion in the liquid return tank 1 is obtained, and the detection data is more accurate.

Specifically, the rigid coupling has the installation pipe 44 with the inside intercommunication of liquid return tank 1 at liquid return tank 1 lateral wall department, and installation pipe 44 installs in liquid return tank 1 bottom and level setting, and pressure sensor 43 installs in installation pipe 44, and is located the one end that liquid return tank 1 was kept away from to installation pipe 44. Since the installation pipe 44 is communicated with the bottom of the liquid return tank 1, the pressure in the installation pipe 44 is consistent with the pressure at the bottom of the liquid return tank 1, and the pressure in the installation pipe 44 detected by the pressure sensor 43 is the pressure in the liquid return tank 1. And pressure sensor 43 is located the one end that mounting tube 44 is kept away from liquid return tank 1 for when having new emulsion to liquid return tank 1 in, when being influenced by the emulsion that flows in and produce undulant vibration and pressure vibration in liquid return tank 1, the pressure in mounting tube 44 vibrates less, makes the pressure in the mounting tube 44 that detects out more stable.

And, in order to further improve the stability of the detection data, the whole installation tube 44 can be arranged in an S shape, certainly, the whole installation tube 44 can also be in a zigzag or corrugated shape, the bending path of the installation tube 44 can be increased, and the influence on the installation tube 44 caused by the liquid level oscillation in the liquid return box 1 is further reduced.

The implementation principle of a non-backpressure liquid return system in the embodiment of the application is as follows: during the use, the emulsion that flows from hydraulic support will arrive in the case of returning the liquid 1 and be collected, and liquid level detection device 4 can be real-time detect the emulsion volume in the case of returning the liquid 1 simultaneously to according to the numerical control flow of large-traffic plunger pump 31 of the numerical control that detects. The on-way resistance of the emulsion during liquid return is overcome, and the normal liquid return and work of the hydraulic support are ensured.

The embodiment of the application also discloses a large-flow plunger pump. Referring to fig. 4, which is a schematic diagram of a currently-used plunger pump, an output shaft of a motor of the plunger pump drives a crankshaft 61 to rotate, and the crankshaft 61 drives a slider 63 to make a reciprocating linear motion through a connecting rod 62, so as to change the pressure in a pump chamber 64, and enable a liquid suction valve 65 and a liquid discharge valve 66 to alternately open and close to complete liquid suction and discharge. Taking fig. 5 as an example, when the slider 63 moves to the left, the volume of the pump chamber 64 increases and the pressure decreases, so that the valve core of the liquid suction valve 65 opens, and the liquid connected to the liquid suction port of the plunger pump can be sucked into the pump chamber 64; when the slide block 63 moves to the right, the volume of the pump cavity 64 is reduced, the pressure is increased, the valve core of the liquid suction valve 65 is closed, the valve core of the liquid discharge valve 66 is opened, and the liquid in the pump cavity 64 can be discharged from the liquid discharge port, so that the liquid discharge work is completed. In order to avoid damage to the plunger pump caused by the large heating of the rotational connection between the crankshaft 61 and the motor output shaft and the rotational connection between the crankshaft 61 and the connecting rod 62 due to the large friction force, a built-in lubrication circuit (not shown in the figure) is further disposed inside the plunger pump, and in order to meet the lubrication requirement of the motor output shaft under different rotating speeds, the displacement of the lubricating oil in the built-in lubrication circuit is in direct proportion to the rotating speed of the motor output shaft. However, in practical application, when the rotating speed of the motor in the plunger pump is low, the lubricating oil discharged by the built-in lubricating circuit is too little, and a complete oil film cannot be formed on the rotating surfaces of the two parts, so that the internal friction of the plunger pump is too large, heat is generated, and the plunger pump is damaged. Especially in heavy load occasions such as mining, the rotating speed of the motor on the plunger pump is generally 1000-1500r/min, and the speed regulating range can only be used between 20% and 100%.

Therefore, referring to fig. 5, the large-flow plunger pump disclosed in the embodiment of the present application includes a pump body 311 and an external lubrication circuit 312 disposed outside the pump body 311 to provide lubrication for the pump body 311, where the external lubrication circuit 312 includes a lubrication pump 3121 having a liquid inlet connected to external lubrication oil and a connection pipe 3122 connected to a liquid outlet of the lubrication pump 3121, two connection pipes 3122 are provided, one of the two connection pipes 3122 is connected to a rotational connection point between the crankshaft 61 of the pump body 311 and the output shaft of the motor, and the other is connected to a rotational connection point between the crankshaft 61 and the connection rod 62, when the operating speed of the large-flow plunger pump 31 is low (when the speed is below 20%), lubrication can be provided for the pump body 311 through the external lubrication circuit, and it is ensured that the large-flow plunger pump 31 is not damaged by frictional heating when the large-flow plunger pump 31 is low in operation. By adopting the method, the high-flow plunger pump 31 can realize 10% -100% rotation speed adjustment under the heavy-load condition, meet the use requirements under various conditions and have wider application range.

The implementation principle of a large-flow plunger pump in the embodiment of the application is as follows: when the rotating speed of the high-flow plunger pump 31 is between 20% and 100%, the pump body 311 can be directly lubricated by the built-in lubrication circuit, and certainly, the pump body 311 can be lubricated by the built-in lubrication circuit and the external lubrication circuit 312 together, so that the lubrication effect is better. When the rotating speed of the large-flow plunger pump 31 is reduced to be below 20%, the external lubrication loop 312 can provide sufficient lubrication for the pump body 311, so that the normal operation of the pump body 311 is ensured, and the situation that the pump body 311 is damaged due to friction heat caused by insufficient lubrication is reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a no backpressure returns liquid system which characterized in that: the device comprises a liquid return box (1) arranged at a liquid outlet of the hydraulic support and used for collecting the emulsion flowing out of the hydraulic support, a liquid return pipe (2) communicated between the liquid return box (1) and an emulsion pump station, and a power device (3) arranged on the liquid return pipe (2) and used for conveying the emulsion in the liquid return box (1) to the emulsion pump station through the liquid return pipe (2).

2. The backpressure-free liquid return system of claim 1, wherein: the power device (3) is a high-flow plunger pump (31), and the high-flow plunger pump (31) is configured to be capable of adjusting the flow rate of the emulsion according to the amount of the emulsion in the liquid return tank (1).

3. A backpressure-free fluid return system as claimed in claim 2, wherein: a liquid level detection device (4) is installed in the liquid return box (1), and the liquid level detection device (4) is used for detecting the amount of the emulsion in the liquid return box (1).

4. A backpressure-free fluid return system as claimed in claim 3, wherein: return liquid case (1) lateral wall department rigid coupling has communicating pipe (42), keep away from communicating pipe (42) the one end of returning liquid case (1) upwards extends, liquid level detection device (4) are including installing level gauge (41) of communicating pipe (42) inner wall department.

5. The backpressure-free liquid return system as claimed in claim 4, wherein: the whole communicating pipe (42) is L-shaped, and one end of the communicating pipe (42) far away from the liquid return tank (1) is vertically and upwards arranged.

6. A backpressure-free fluid return system as claimed in claim 3, wherein: the utility model discloses a liquid level detection device, including liquid return case (1), installation pipe (44) are located the rigid coupling to liquid return case (1) lateral wall, installation pipe (44) level sets up, liquid level detection device (4) are including installing pressure sensor (43) in installation pipe (44), pressure sensor (43) are used for detecting the pressure that liquid return case (1) bottom born is in order to obtain the emulsion volume in liquid return case (1).

7. A backpressure-free fluid return system as claimed in claim 2, wherein: and a motor of the large-flow plunger pump (31) is a variable-frequency all-in-one machine.

8. A backpressure-free fluid return system as claimed in claim 2, wherein: the power device (3) further comprises a frequency converter, and the frequency converter is electrically connected with a motor of the large-flow plunger pump (31).

9. A large-traffic plunger pump which characterized in that: the high-flow plunger pump according to any one of claims 2-8, comprising a pump body (311) and an external lubrication circuit (312) on one side of the pump body (311) for supplying lubrication oil to the inside of the pump body (311).