A kind of intelligent gear pump and working method thereof

Abstract

The present invention relates to the technical field of gear pumps, and discloses an intelligent gear pump and a working method thereof, wherein the intelligent gear pump comprises a pump body, wherein the pump body is provided with a motor through a base, wherein the motor output end extends into the pump body and is provided with a main gear, wherein a slave gear matching the main gear is provided in the pump body; wherein the pump body is provided with a pressure sensor 1 and a pressure sensor 2 through a pump cover, wherein the pressure sensor 1 and the pressure sensor 2 are respectively connected to the inner cavity of the pump body through a flow channel 1 and a flow channel 2 provided on the pump cover, wherein an electromagnetic reversing valve is provided on the pump cover, wherein the output end of the electromagnetic reversing valve is connected to the flow channel 2, and the input end of the electromagnetic reversing valve is connected to the inner cavity of the pump body through a flow channel 3; both the flow channel 1 port and the flow channel 2 port are located on one side of the pump body inlet, and the flow channel 2 port is located between the flow channel 1 port and the main gear, and the flow channel 3 port is located on one side of the pump body outlet. The present invention realizes flow calibration by controlling the motor speed, thereby ensuring the stable output of the pump body outlet flow, and greatly improving the service life of the gear pump.

Description

Technical Field

[0001] The invention relates to the technical field of gear pumps, in particular to an intelligent gear pump and a working method thereof. Background Art

[0002] The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. It consists of two closed spaces, two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the side where the gears are disengaged changes from small to large, forming a vacuum to suck in the liquid, and the volume of the space on the side where the gears are meshing changes from large to small, squeezing the liquid into the pipeline.

[0003] During the use of existing gear pumps, when the two gears in the pump body rotate, the teeth collide with each other, causing the teeth to wear, which may cause the gap between the gear teeth to widen. In addition, when the gears rotate, friction may also occur between the gear end faces and the pump body, causing the gap between the gear end faces to increase, thereby increasing leakage and reducing outlet flow, thereby limiting the service life of the gear pump. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes an intelligent gear pump and a working method thereof, which can change the flow output of the pump body by controlling the motor speed, ensure the stability of the outlet flow, and increase the service life of the gear pump.

[0005] The technical solution of the present invention is achieved in this way:

[0006] An intelligent gear pump comprises a hollow pump body, a motor is arranged below the pump body through a base, an output end of the motor passes through the base and extends into the pump body and is equipped with a main gear, and a slave gear is arranged in the pump body to cooperate with the main gear;

[0007] A pressure sensor 1 and a pressure sensor 2 are arranged above the pump body through the pump cover. The pressure sensor 1 and the pressure sensor 2 are respectively connected to the inner cavity of the pump body through the flow channel 1 and the flow channel 2 opened on the pump cover. An electromagnetic reversing valve is arranged on the pump cover. The output end of the electromagnetic reversing valve is connected to the flow channel 2, and the input end of the electromagnetic reversing valve is connected to the inner cavity of the pump body through the flow channel 3.

[0008] The ports of flow channel 1 and flow channel 2 are both located on the side of the main gear close to the pump body inlet, and the port of flow channel 2 is located between the port of flow channel 1 and the main gear, and the port of flow channel 3 is located on the side of the slave gear away from the main gear.

[0009] The present invention is further configured as follows: the second flow channel includes a throttling channel and a pressure measuring flow channel, the pressure measuring flow channel and the throttling channel are perpendicular to each other, one end of the pressure measuring flow channel is connected to the output end of the electromagnetic reversing valve, the second pressure sensor is located above the pressure measuring flow channel on the pump cover and is connected to the pressure measuring flow channel, the throttling channel is connected to the inner cavity of the pump body, and a throttling orifice plate is arranged in the throttling channel.

[0010] The present invention is further configured as follows: a one-way output valve is installed at the outlet end of the pump body.

[0011] The present invention is further configured as follows: a driver for controlling the opening and closing of the electromagnetic reversing valve and the one-way output valve and controlling the operation of the motor is arranged outside the pump body, and the driver is electrically connected to a host computer.

[0012] The present invention is further configured as follows: the driver is electrically connected to the pressure sensor 1 and the pressure sensor 2, the driver is used to transmit the measured value data of the pressure sensor 1 and the pressure sensor 2 to the host computer, the host computer compares the obtained data with the standard set value, and controls the opening and closing of the electromagnetic reversing valve, the one-way output valve and the operation of the motor through the driver based on the comparison result.

[0013] The present invention is further configured as follows: the host computer is a control terminal, and the driver is a single chip microcomputer or a PLC controller.

[0014] A working method of an intelligent gear pump includes three working states: normal operation, flow monitoring and flow calibration:

[0015] During normal operation, the electromagnetic reversing valve is closed, the one-way output valve is opened, the motor drives the main gear to rotate, and then drives the slave gear to rotate. The main gear and the slave gear cooperate with each other to make the one-way output valve output liquid with stable flow and pressure;

[0016] During flow monitoring, the electromagnetic reversing valve is opened, the one-way output valve is closed, and the liquid passing through the master gear and the slave gear passes through the electromagnetic reversing valve from flow channel three and enters the pressure measuring flow channel of flow channel two. Pressure sensor two measures the liquid pressure in the pressure measuring flow channel and compares the measured pressure with the actual set pressure to determine whether flow calibration is required;

[0017] During flow calibration, the electromagnetic reversing valve is opened, the one-way output valve is closed, and when the pressure measured by pressure sensor 2 is different from the actual set value, the host computer adjusts the speed of the motor through the driver until the pressure value measured by pressure sensor 2 reaches the actual set value, records the speed of the motor at this time, and completes the flow calibration.

[0018] The beneficial technical effect of the present invention is that even if the main gear or the slave gear in the pump body is worn, the liquid flow at the outlet of the pump body can still be kept stable by controlling the motor speed, which greatly prolongs the service life of the gear pump.

[0019] Pressure sensor 1 can measure the liquid pressure at the inlet end of the pump body in real time, and pressure sensor 2 can measure the liquid pressure entering flow channel 2 through the throttling orifice plate in real time, so that the staff can pay attention to the liquid pressure at the inlet end of the pump body in real time;

[0020] When the present invention is working, flow monitoring is required. During the flow monitoring, the electromagnetic reversing valve needs to be opened and the output check valve needs to be closed at regular intervals while the motor is kept in normal operation. If the pressure measured by the second pressure sensor is different from the actual set value at a certain time, it can be determined that the pump body is operating abnormally and flow calibration is required.

[0021] When performing flow calibration, the staff closes the one-way output valve and opens the electromagnetic reversing valve, and then controls the rotation of the motor, thereby changing the rotation speed of the main gear and the slave gear, thereby changing the flow rate of the liquid entering the pump body. The liquid at the outlet end of the pump body passes through the electromagnetic reversing valve from the flow channel three into the flow channel two, and the pressure sensor two measures the pressure of this part of the liquid. When the pressure measured by the pressure sensor two is equal to the actual set value, the motor speed at this time is recorded, and the flow calibration of the present invention is completed. After that, the electromagnetic reversing valve is closed and the one-way output valve is opened, and the motor is rotated at the speed recorded during calibration to achieve normal operation of the pump body;

[0022] The entire operation process of the pump body, including normal operation, flow monitoring and flow calibration, can be completed through the host computer and driver control, which is convenient and fast and can greatly extend the service life of the gear pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0024] Figure 1 This is the overall operation principle diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the plane structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0027] In the figure, 1, pump body; 21, base; 22, motor; 3, pump cover; 41, pressure sensor 1; 42, pressure sensor 2; 51, flow channel 1; 52, flow channel 2; 521, pressure measuring flow channel; 522, throttling channel; 53, flow channel 3; 6, throttling orifice; 7, electromagnetic reversing valve; 8, one-way output valve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] Reference Figure 2 and Figure 3 , an intelligent gear pump comprises a pump body 1. Specifically, the pump body 1 is hollow, one end of the pump body 1 is an inlet end, the other end is an outlet end, and a gear cavity is between the inlet end and the outlet end of the pump body 1.

[0031] A base 21 is installed below the pump body 1, and a motor 22 is installed on the base 21. The motor 22 can be a stepper motor or a servo motor for easy speed control. The output end of the motor 22 extends through the base 21 to the gear cavity in the pump body 1, and one end of the output shaft of the motor 22 extending into the gear cavity is rotatably connected to the pump body 1 through a bearing. A main gear is installed on the output shaft of the motor 22, and a slave gear that cooperates with the main gear is installed in the pump body 1, and the slave gear and the main gear are meshed with each other.

[0032] A pump cover 3 is installed on the side of the pump body 1 away from the base 21, and a pressure sensor 1 41 and a pressure sensor 2 42 are installed on the pump cover 3. A flow channel 1 51 and a flow channel 2 52 are opened in the pump cover 3, and the pressure sensor 1 41 is connected to the inlet end of the pump body 1 through the flow channel 1 51.

[0033] The second pressure sensor 42 is connected to the inlet end of the pump body 1 through the second flow channel 52. Specifically, the through hole connecting the second flow channel 52 with the inner cavity of the pump body 1 is located between the through hole connecting the first flow channel 51 with the inner cavity of the pump body 1 and the gear cavity.

[0034] The pump cover 3 is provided with an electromagnetic reversing valve 7, which is located on one side of the outlet end of the pump body 1 on the pump cover 3. The flow channel 2 52 is connected to the output end of the electromagnetic reversing valve 7. Specifically, the flow channel 2 52 includes a throttling channel 522 and a pressure measuring channel 521. The pressure measuring channel 521 is parallel to the length direction of the inner cavity channel of the pump body 1 and is perpendicular to the length direction of the throttling channel 522. The throttling channel 522 is directly connected to the inlet end of the pump body 1, and one end of the pressure measuring channel 521 is connected to the output end of the electromagnetic reversing valve 7, and the other end is connected to the end of the throttling channel 522 away from the inner cavity of the pump body 1.

[0035] The second pressure sensor 42 is located above the pressure measuring channel 521 on the pump cover 3 and communicates with the pressure measuring channel 521. This enables the second pressure sensor 42 to measure the pressure in the pressure measuring channel 521.

[0036] The pump cover 3 is provided with a flow channel 3 53, which is parallel to the length direction of the flow channel 1 51 and communicates with the outlet end of the pump body 1. The input end of the electromagnetic reversing valve 7 is communicated with the end of the flow channel 3 53 away from the inner cavity of the pump body 1.

[0037] In this embodiment, a throttling orifice plate 6 is provided in the throttling channel 522, and the throttling orifice plate 6 is located at the junction of the throttling channel 522 and the pump body 1. The function of the throttling orifice plate 6 is to reduce the pressure of the liquid flowing from the electromagnetic reversing valve 7 to the inner cavity of the pump body 1, so as to avoid the liquid flow output from the main gear and the slave gear being unstable due to excessive liquid flow flowing to the main gear and the slave gear.

[0038] In this embodiment, a one-way output valve 8 is installed at the outlet end of the pump body 1. Only when the flow through the main gear and the slave gear reaches the set threshold of the one-way output valve 8, liquid will flow out of the one-way output valve 8, ensuring the stable output of the one-way output valve 8.

[0039] The specific implementation principle of this embodiment is as follows: when this embodiment works normally, that is, when the main gear and the slave gear in the pump body 1 are not worn, the motor 22 drives the main gear to rotate, and then drives the slave gear to rotate, and then pumps the liquid at the inlet end of the pump body 1 to the outlet end of the pump body 1. At this time, the pressure sensor 1 41 measures the pressure at the inlet end of the pump body 1, and the pressure sensor 2 42 measures the pressure from the inlet end of the pump body 1 through the throttling orifice 6 into the flow channel 2 52, the electromagnetic reversing valve 7 does not work, and the pressure of the liquid delivered to the outlet end of the pump body 1 reaches the set value of the one-way output valve 8, and finally the liquid flows out of the one-way output valve 8 stably;

[0040] When the electromagnetic reversing valve 7 is opened and the one-way output valve 8 is closed, the liquid pumped to the outlet end of the pump body 1 passes through the electromagnetic reversing valve 7 from the flow channel 3 53 and enters the pressure measuring flow channel 521 of the flow channel 2 52. The pressure sensor 2 42 can measure the pressure of the liquid in the pressure measuring flow channel 521 at this time. If the pressure measured by the pressure sensor 2 42 is different from the actual set value, it can be determined that the pump body 1 is operating abnormally and flow calibration is required.

[0041] When performing flow calibration, the staff gradually changes the speed of the main gear and the slave gear by controlling the speed of the motor 22, thereby changing the liquid flow at the outlet end of the pump body 1, and then changing the pressure of the liquid entering the pressure measuring channel 521. When the pressure sensor 242 measures that the liquid pressure in the pressure measuring channel 521 reaches the actual set value, the speed of the motor 22 at this time is recorded, and the motor 22 continues to run at this speed to complete the flow calibration of the present invention. After that, the electromagnetic reversing valve 7 is closed and the one-way output valve 8 is opened to perform normal operation of the pump body 1.

[0042] It should be noted that, when the present invention is actually working, different actual setting values ​​are set for the pressure sensor 2 42 according to different actual working conditions. This is determined by the actual working conditions and is an actual known value.

[0043] In addition, in the present invention, when the flow rate at the outlet of the pump body remains unchanged, the motor speed is re-corrected, and the fitting of the new flow command curve of the present invention is completed according to the flow calibration working condition of the gear pump. When the output flow rate at the outlet of the pump body is changed thereafter, the present invention will work according to the new flow command curve to complete the self-repair calibration action of the pump flow accuracy.

[0044] Through the above-mentioned flow calibration process, even if the main gear or the slave gear is worn, the liquid flow at the outlet of the pump body 1 can still be kept stable by controlling the rotation speed of the motor 22, thereby greatly extending the service life of the gear pump.

[0045] Embodiment 2:

[0046] This embodiment is a further improvement made on the basis of Embodiment 1.

[0047] Reference Figure 1 and Figure 3 In this embodiment, a driver for controlling the opening and closing of the electromagnetic reversing valve 7 and the one-way output valve 8 and controlling the operation of the motor 22 is arranged outside the pump body 1. The driver can be a single-chip microcomputer or a PLC controller, and the electromagnetic reversing valve 7, the one-way output valve 8 and the motor 22 are all electrically connected to the driver.

[0048] At the same time, the driver is electrically connected to the pressure sensor 1 41 and the pressure sensor 2 42 and is electrically connected to the host computer, which is a control terminal and can be selected as a computer. The values ​​measured by the pressure sensor 1 41 and the pressure sensor 2 42 are transmitted to the host computer through the driver. The host computer can display the measured values ​​to the staff, and also compare the measured value of the pressure sensor 2 with the actual set value. According to the comparison result, it is determined whether flow calibration is required. When performing flow calibration, the host computer controls the opening and closing of the electromagnetic reversing valve 7 and the one-way output valve 8 and the operation of the motor 22 through the driver.

[0049] In this embodiment, pressure sensor 1 41 and pressure sensor 2 42 transmit the actual pressure measured to the host computer through the driver. During flow calibration, the host computer can determine whether the operation of the pump body 1 is normal after comparing the pressure measured by pressure sensor 2 42 with the actual set value, which makes it easier for the staff to perform calibration in time.

[0050] Embodiment 3:

[0051] This embodiment is a working method of an intelligent gear pump as described in Embodiment 2, which includes three working states: normal operation, flow monitoring and flow calibration:

[0052] When the pump body 1 is in normal working state, the staff controls the electromagnetic reversing valve 7 to close, the one-way output valve 8 to open and keep the motor 22 in normal operation through the upper computer and the driver. The operation of the motor 22 can drive the main gear to rotate, and then drive the slave gear to rotate. The main gear and the slave gear cooperate with each other to make the one-way output valve 8 output liquid with stable flow and pressure;

[0053] When the pump body 1 is in the flow monitoring state, the staff controls the electromagnetic reversing valve 7 to open, the one-way output valve 8 to close and keeps the motor 22 running normally through the upper computer and the driver. The liquid pumped to the outlet end of the pump body 1 by the main gear and the slave gear passes through the electromagnetic reversing valve 7 from the flow channel 3 53 and enters the pressure measuring flow channel 521 of the flow channel 2 52. The pressure sensor 2 42 measures the liquid pressure in the pressure measuring flow channel 521 and compares the measured pressure value with the actual set value to determine whether flow calibration is required. If the measured pressure value is not equal to the actual set value, flow calibration of the pump body 1 is required.

[0054] During the flow monitoring period, the staff sends a command to the driver through the upper computer to open the electromagnetic reversing valve 7, close the output check valve 8 and keep the motor 22 running normally. If the pressure measured by the pressure sensor 242 is different from the actual set value at a certain time, the operation of the pump body 1 can be timely understood through regular monitoring to avoid the pump body 1 being in an abnormal working state for a long time, so that the staff can timely calibrate the flow of the abnormally working pump body;

[0055] When the pump body 1 is in the flow calibration state, the staff controls the electromagnetic reversing valve 7 to open, the one-way output valve 8 to close and keep the motor 22 running through the host computer and the driver. The host computer adjusts the speed of the motor 22 through the driver until the pressure value measured by the pressure sensor 242 reaches the actual set value, records the speed of the motor 22 at this time, completes the flow calibration, and then closes the electromagnetic reversing valve 7 and opens the one-way output valve 8 through the host computer and the driver, while keeping the motor 22 running at the recorded speed to achieve normal output at the outlet of the pump body 1.

[0056] The working method of the present invention is simple and practical. It only needs to pre-set the set values ​​of pressure sensor 1 41 and pressure sensor 2 42. When the actual value measured by pressure sensor 1 41 does not match the set value, it can be judged that the output of pump body 1 is abnormal. Then, the one-way output valve 8 is closed and the single-way reversing valve is opened to allow the liquid on the outlet side of pump body 1 to flow from the electromagnetic reversing valve 7 to the pressure measuring channel 521. Then, based on the comparison result between the actual measured value of pressure sensor 2 42 and the pre-set value, it can be judged whether the flow calibration of the present invention is completed.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent gear pump, characterized in that: The pump body (1) comprises a motor (22) disposed below the pump body (1) through a base (21); an output end of the motor (22) passes through the base (21) and extends into the pump body (1) and is provided with a main gear; and a slave gear matched with the main gear is provided in the pump body (1); A pressure sensor 1 (41) and a pressure sensor 2 (42) are arranged above the pump body (1) through a pump cover (3); the pressure sensor 1 (41) and the pressure sensor 2 (42) are respectively connected to the inner cavity of the pump body (1) through a flow channel 1 (51) and a flow channel 2 (52) provided on the pump cover (3); an electromagnetic reversing valve (7) is arranged on the pump cover (3); the output end of the electromagnetic reversing valve (7) is connected to the flow channel 2 (52), and the input end of the electromagnetic reversing valve (7) is connected to the inner cavity of the pump body (1) through a flow channel 3 (53); The port of flow channel 1 (51) and the port of flow channel 2 (52) are both located on the side of the main gear close to the inlet of the pump body (1), and the port of flow channel 2 (52) is located between the port of flow channel 1 (51) and the main gear, and the port of flow channel 3 (53) is located on the side of the slave gear away from the main gear.

2. The intelligent gear pump according to claim 1, characterized in that: The second flow channel (52) comprises a throttling channel (522) and a pressure measuring flow channel (521), the pressure measuring flow channel (521) and the throttling channel (522) being perpendicular to each other, one end of the pressure measuring flow channel (521) being connected to the output end of the electromagnetic reversing valve (7), the second pressure sensor (42) being located above the pressure measuring flow channel (521) on the pump cover (3) and being connected to the pressure measuring flow channel (521), the throttling channel (522) being connected to the inner cavity of the pump body (1), and a throttling orifice plate (6) being arranged in the throttling channel (522).

3. An intelligent gear pump according to claim 1 or 2, characterized in that: A one-way output valve (8) is installed at the outlet end of the pump body (1).

4. The intelligent gear pump according to claim 3, characterized in that: A driver for controlling the opening and closing of the electromagnetic reversing valve (7) and the one-way output valve (8) and controlling the operation of the motor (22) is arranged outside the pump body (1), and the driver is electrically connected to a host computer.

5. The intelligent gear pump according to claim 4, characterized in that: The driver is electrically connected to the pressure sensor 1 (41) and the pressure sensor 2 (42). The driver is used to transmit the measured value data of the pressure sensor 1 (41) and the pressure sensor 2 (42) to the host computer. The host computer compares the obtained data with the standard set value, and controls the opening and closing of the electromagnetic reversing valve (7), the one-way output valve (8) and the operation of the motor (22) through the driver according to the comparison result.

6. An intelligent gear pump according to claim 4 or 5, characterized in that: The host computer is a control terminal, and the driver is a single chip microcomputer or a PLC controller.

7. A method for operating an intelligent gear pump as claimed in claim 6, characterized in that: It includes three working states: normal operation, flow monitoring and flow calibration: During normal operation, the electromagnetic reversing valve (7) is closed, the one-way output valve (8) is opened, the motor (22) drives the main gear to rotate, and then drives the slave gear to rotate, and the main gear and the slave gear cooperate with each other to make the one-way output valve (8) output liquid with stable flow and pressure; When monitoring the flow rate, the electromagnetic reversing valve (7) is opened, the one-way output valve (8) is closed, and the liquid passing through the master gear and the slave gear passes through the electromagnetic reversing valve (7) from the flow channel three (53) and enters the pressure measuring flow channel (521) of the flow channel two (52). The pressure sensor two (42) measures the pressure of the liquid in the pressure measuring flow channel (521), and compares the measured pressure with the actual set pressure to determine whether flow calibration is required; During flow calibration, the electromagnetic reversing valve (7) is opened, the one-way output valve (8) is closed, and when the pressure measured by the second pressure sensor (42) is different from the actual set value, the host computer adjusts the speed of the motor (22) through the driver until the pressure value measured by the second pressure sensor (42) reaches the actual set value, and records the speed of the motor (22) at this time, thereby completing the flow calibration.

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