Electric lubrication pump and oil circuit control method thereof, and lubrication device having the electric lubrication pump

Abstract

The present invention relates to an electric lubrication pump, including an oil tank; an oil pump, which is arranged in the oil tank; a motor, which is connected to the oil pump drive; a differential pressure automatic reversing valve, whose oil inlet is connected to the outlet of the oil pump, whose oil return port is connected to the oil tank, whose oil outlet is connected to the main oil circuit joint, and whose oil outlet forms the main oil port; and an electromagnetic reversing valve, which is a two-position three-way reversing valve, whose oil inlet is connected to the oil outlet of the differential pressure automatic reversing valve, whose oil return port is connected to the oil tank, and whose oil outlet forms the auxiliary oil port. The electric lubrication pump can realize the auxiliary oil circuit pressure relief whether the electromagnetic reversing valve is energized or not, and ensure the reliable unloading of the auxiliary oil circuit. The present invention also relates to an oil circuit control method of an electric lubrication pump and a lubrication device using the electric lubrication pump, wherein the lubrication device is simple to control and has reliable unloading operation.

Description

Technical Field

[0001] The invention relates to an electric lubrication pump, an oil circuit control method of the electric lubrication pump, and a lubrication device using the electric lubrication pump. Background Art

[0002] The pressure relief electric lubrication pump is a lubrication device, which is combined with a volumetric quantitative distributor to form an electric fixed-point quantitative centralized lubrication device. The two necessary conditions for the reliable operation of the electric fixed-point quantitative centralized lubrication device are: ① The quantitative distributor must have a sufficiently high working pressure when filling the oil, otherwise the piston of the quantitative distributor will not move into place and cause imperfect oil distribution; ② When the pump is stopped and the pressure is automatically relieved, there must be a sufficiently low unloading pressure, otherwise the restoring force of the reset spring of the quantitative distributor is small, and the piston of each quantitative distributor cannot be driven to reset, resulting in imperfect quantitative oil storage and abnormal oil supply of the quantitative distributor in the next oil supply cycle. In the same equipment, the amount of oil required by each friction pair varies, which is specifically determined by the area, load, relative motion speed, friction pair material, matching accuracy and geometric tolerance of the friction pair. The electric fixed-point quantitative centralized lubrication device provides quantitative lubricants of different specifications according to the amount of oil required by each friction pair, so that the friction pair with a large amount of oil needs a large amount of lubricant each time, and the friction pair with a small amount of oil needs a small amount of lubricant, realizing "on-demand distribution" close to the amount of oil required by each friction pair. The friction pairs with large oil requirements have sufficient oil film, and the friction pairs with small oil requirements do not have excessive oil overflow to cause waste and pollute the environment. The oil filling cycle of each lubrication point of a set of fixed-point quantitative centralized lubrication devices is the same. When the oil requirements of each friction pair of some equipment vary too much, such as the oil requirements of each friction pair of a water jet loom differ by dozens of times, the oil supply specification difference of the quantitative distributor alone cannot meet the requirements. Different lubrication cycles must be adopted to achieve this, that is, either set up two or more sets of fixed-point quantitative centralized lubrication devices, or adopt the quantitative centralized lubrication device to supply oil in different time periods. Obviously, setting up two or more sets of fixed-point quantitative centralized lubrication devices not only increases costs, but also makes installation and maintenance troublesome.

[0003] In the time-sharing lubrication technology of fixed-point quantitative centralized lubrication devices, the existing technology usually uses Figure 1The structure shown is that an electric lubrication pump has a single output, and the external three-way is divided into two ways, one of which is output to the main oil circuit, and the other is output to the auxiliary oil circuit after being controlled by the on-off control of the electromagnetic reversing valve. The technical structure specifically includes an oil pump 100, an oil pump motor 200 that drives the oil pump 100, and a differential pressure reversing valve 300 connected to the oil pump 100. The oil outlet of the differential pressure reversing valve 300 is the output outlet of the oil pump, and an external three-way 400. The oil circuit connected to one output outlet of the three-way 400 is used as the main oil circuit, and the oil circuit connected to the other output outlet of the three-way 400 through a two-position two-way electromagnetic reversing valve 500 is used as the auxiliary oil circuit. The on-off of the two-position two-way electromagnetic reversing valve 500 is controlled to realize whether the auxiliary oil circuit is supplied with oil. In this way, the oil supply cycle of the auxiliary oil circuit can be any integer multiple of the main oil circuit, and the main and auxiliary oil circuits can be supplied with oil in different time periods.

[0004] However, during use, when the oil pump motor loses power, the two-position two-way solenoid reversing valve 500 cannot be powered off immediately, otherwise the connection between the auxiliary oil circuit and the differential pressure reversing valve 300 cannot be guaranteed, and the auxiliary oil circuit cannot be unloaded. Only after the auxiliary oil circuit is unloaded, can the two-position two-way solenoid reversing valve 500 be powered off to close the auxiliary oil circuit. If the two-position two-way solenoid reversing valve 500 is powered off immediately when the oil pump motor 200 loses power, the auxiliary oil circuit will be closed and the unloading of the auxiliary oil circuit cannot be completed. In addition, when controlling the two-position two-way solenoid reversing valve 500 to be powered off later than the oil pump motor 200, a delay time is usually set. However, due to the influence of the external temperature, the viscosity of the lubricating grease becomes thicker as the ambient temperature decreases and becomes thinner as the temperature increases. The grease flow rate is related to the viscosity. That is to say, in order to ensure the full unloading of the auxiliary oil circuit, the delayed power-off time of the electromagnetic reversing valve should also change with the change of ambient temperature. For example, in the summer when the ambient temperature is high, after the oil pump motor loses power, the electromagnetic reversing valve delays for 30 seconds before powering off, and the auxiliary oil circuit can complete the pressure relief; in the winter when the ambient temperature is low, after the oil pump motor loses power, the electromagnetic reversing valve may have to delay for 300 seconds before powering off, otherwise it may cause the auxiliary oil circuit to be insufficiently unloaded, and the piston of the quantitative distributor of the auxiliary oil circuit will not be reset or reset incompletely, which will cause the quantitative distributor of the auxiliary oil circuit to not distribute oil or the oil distribution amount is incomplete in the next lubrication cycle. In addition, since the two-position two-way reversing valve 500 in this structure needs to be powered on for a long time, its life will also be affected. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide an electric lubrication pump that can relieve pressure in the auxiliary oil circuit regardless of whether the electromagnetic reversing valve is energized or not, thereby ensuring reliable unloading of the auxiliary oil circuit.

[0006] The second technical problem to be solved by the present invention is to provide an oil circuit control method for an electric lubrication pump with convenient control and reliable unloading in view of the above-mentioned prior art.

[0007] The third technical problem to be solved by the present invention is to provide a lubrication device with simple control and reliable unloading operation for the above-mentioned prior art.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: an electric lubrication pump, comprising

[0009] tank;

[0010] An oil pump, disposed in the oil tank;

[0011] A motor, connected to the oil pump drive;

[0012] A differential pressure automatic reversing valve, the oil inlet is connected to the outlet of the oil pump, the oil return port is connected to the oil tank, and the oil outlet forms a main oil port for connecting to an external main oil circuit;

[0013] It is characterized by: it also includes

[0014] The solenoid reversing valve is a normally unloaded two-position three-way reversing valve. The oil inlet of the solenoid reversing valve is connected to the oil outlet of the differential pressure automatic reversing valve, the oil return port of the solenoid reversing valve is connected to the oil tank, and the oil outlet of the solenoid reversing valve forms an auxiliary oil port for connecting to an external auxiliary oil circuit.

[0015] In order to facilitate monitoring of the oil outlet pressure of the differential pressure automatic reversing valve, a pressure gauge is provided on the main oil circuit connector.

[0016] In order to facilitate the connection between the main oil circuit and the auxiliary oil circuit, a main oil circuit connector is provided on the oil outlet of the differential pressure automatic reversing valve, and an auxiliary oil circuit connector is provided on the oil outlet of the electromagnetic reversing valve.

[0017] For safety, an overflow valve is connected between the oil inlet and the oil return port of the differential pressure automatic reversing valve.

[0018] Preferably, a filter screen is provided at the inlet of the oil pump.

[0019] For convenient installation, the opening of the oil tank is matched and covered with a mounting plate, the oil pump motor, the electromagnetic drive part of the electromagnetic reversing valve, the main oil circuit connector, and the auxiliary oil circuit connector are located above the mounting plate, and the oil pump, the differential pressure automatic reversing valve, and the valve body of the electromagnetic reversing valve are located below the mounting plate.

[0020] Preferably, the electromagnetic drive part of the motor and the electromagnetic reversing valve is also provided with a cover.

[0021] In order to facilitate refueling into the fuel tank, a refueling connector is also provided above the mounting plate.

[0022] For convenient installation, a connecting frame extending to the bottom of the oil tank is connected below the mounting plate, the oil pump is connected to the lower end of the connecting frame, and the differential pressure automatic reversing valve is connected to the connecting frame.

[0023] In order to ensure smoother oil return in the auxiliary oil circuit, the valve body of the electromagnetic reversing valve is vertically arranged on the upper part of the oil tank, and a channel is axially penetrated through the valve body of the electromagnetic reversing valve, and the lower end of the channel forms the oil return port of the electromagnetic reversing valve.

[0024] The oil inlet and the oil outlet of the electromagnetic reversing valve are respectively arranged on the side wall of the valve body of the electromagnetic reversing valve in a direction perpendicular to the axis of the channel, and the channels are connected.

[0025] The technical solution adopted by the present invention to solve the above second technical problem is: an oil circuit control method of the above electric lubrication pump, characterized in that: after the electric lubrication pump is turned on, the motor is powered to drive the oil pump to work, the oil pump pumps oil from the oil tank into the differential pressure automatic reversing valve, the oil is output from the oil outlet of the differential pressure automatic reversing valve, and then the oil is supplied to the main oil circuit;

[0026] When the auxiliary oil circuit needs to be supplied with oil, the solenoid reversing valve is energized to open the oil outlet, and part of the oil output by the differential pressure automatic reversing valve is diverted to the solenoid reversing valve, and then supplied to the auxiliary oil circuit through the oil outlet of the solenoid reversing valve;

[0027] When unloading is required, the control motor is powered off, the oil supply to the differential pressure automatic reversing valve is stopped, and the oil in the main oil circuit flows back to the oil tank through the differential pressure automatic reversing valve, completing the automatic unloading of the main oil circuit;

[0028] When the motor is powered off, if the electromagnetic reversing valve is not powered off at the same time, the oil in the auxiliary oil circuit will flow back to the oil tank through the electromagnetic reversing valve and the differential pressure automatic reversing valve, thereby completing the unloading work of the auxiliary oil circuit;

[0029] When the motor is powered off, if the electromagnetic reversing valve is powered off at the same time, the electromagnetic reversing valve will reset and open the oil return port, and the oil in the auxiliary oil circuit will flow back to the oil tank through the oil return port of the electromagnetic reversing valve.

[0030] The technical solution adopted by the present invention to solve the above-mentioned third technical problem is: a lubrication device, characterized in that: it includes an electric lubrication pump as mentioned above, a main oil circuit connected to the oil outlet of the differential pressure automatic reversing valve, and an auxiliary oil circuit connected to the oil outlet of the electromagnetic reversing valve; the main oil circuit is provided with a main quantitative oil distributor and a first pressure switch, and the auxiliary oil circuit is provided with an auxiliary quantitative oil distributor and a second pressure switch.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] ① The electric lubrication pump is integrated with the main oil circuit connector and the auxiliary oil circuit connector, which makes the structure and installation of the main oil circuit and the auxiliary oil circuit simple, reduces the links, reduces the cost, and makes the use and maintenance convenient and intuitive;

[0033] ② Since the electromagnetic reversing valve that controls the on-off of the auxiliary oil circuit is arranged inside the electric lubrication pump, the unloading port and the oil drain port of the electromagnetic reversing valve are unobstructedly connected to the oil tank, and the auxiliary oil circuit can be reliably depressurized whether the electromagnetic reversing valve is energized or not after the pump is stopped.

[0034] Through the connection method of the differential pressure automatic reversing valve and the electromagnetic reversing valve, the oil supply and unloading of the main and auxiliary oil circuits can be effectively controlled by whether the motor and the electromagnetic reversing valve are energized or not, and when the motor is powered off, the auxiliary oil circuit can be unloaded regardless of whether the electromagnetic reversing valve is energized or not. This avoids the confusion about the delay before the electromagnetic reversing valve is powered off and how much delay time is the best, and is also conducive to the leakage of the electromagnetic reversing valve directly back to the oil tank.

[0035] The oil circuit control method of the electric lubrication pump and the lubrication device using the electric lubrication pump make the oil supply and unloading control of the main and auxiliary oil circuits simpler and more reliable, and effectively ensure the realization of two necessary conditions for the reliable operation of the quantitative distributor, thereby reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The schematic diagram of the prior art time-sharing oil supply scheme is shown in FIG.

[0037] Figure 2 Schematic diagram of an electric lubrication pump in an embodiment of the present invention.

[0038] Figure 3 It is a three-dimensional diagram of an electric lubrication pump in an embodiment of the present invention.

[0039] Figure 4 It is a three-dimensional exploded view of the electric lubrication pump in an embodiment of the present invention.

[0040] Figure 5 for Figure 4 Another perspective view.

[0041] Figure 6 It is a three-dimensional diagram of the valve body of the electromagnetic reversing valve in an embodiment of the present invention.

[0042] Figure 7 Schematic diagram of a time-divided fixed-point quantitative lubrication device in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below with reference to the accompanying drawings.

[0044] like Figures 2 to 5 As shown, the electric lubrication pump in this embodiment includes an oil tank 1, an oil pump 2, a motor 3, a differential pressure automatic reversing valve 4, an electromagnetic reversing valve 6, a main oil circuit connector 5, an auxiliary oil circuit connector 7, a pressure gauge 8, a relief valve 40, and a refueling connector 13.

[0045] The oil tank 1 is a box body with an opening upward, and the volume of the box body can be set according to specific needs. A mounting plate 11 is matched and covered on the opening of the oil tank 1, and the mounting plate 11 and the oil tank 1 can be fixedly connected by a fixing member. The oil pump 2, the motor 3, the differential pressure automatic reversing valve 4, the electromagnetic reversing valve 6, the main oil circuit connector 5, and the auxiliary oil circuit connector 7 are all installed on the mounting plate 11.

[0046] Specifically, the motor 3 , the electromagnetic drive part of the electromagnetic reversing valve 6 , the main oil circuit connector 5 , the auxiliary oil circuit connector 7 , and the refueling connector 13 are all fixedly arranged on the upper surface of the mounting plate 11 , and thus are located above the mounting plate 11 .

[0047] In order to ensure the safety of use, the electromagnetic drive part of the motor 3 and the electromagnetic reversing valve 6 is provided with a cover 12, which is fixedly connected to the mounting plate 11 and covers the electromagnetic drive part of the motor 3 and the electromagnetic reversing valve 6. The cover 12 protects the electromagnetic drive part of the motor 3 and the electromagnetic reversing valve 6 on the one hand, and prevents the user from contacting and posing a safety hazard on the other hand. In order to facilitate maintenance, the cover 12 includes a closed-loop side wall 121 and an upper cover 122 covering the side wall. The upper cover 122 is detachably connected to the side wall 121. When maintenance is required, the upper cover 122 can be opened to realize the maintenance work of the electromagnetic drive part of the motor 3 and the electromagnetic reversing valve 6.

[0048] The main oil circuit connector 5, the auxiliary oil circuit connector 7, and the refueling connector 13 are located outside the cover 12 to facilitate the connection of external oil pipes. The specific locations of the main oil circuit connector 5, the auxiliary oil circuit connector 7, and the refueling connector 13 are specifically set based on the convenience of connection. The main oil circuit connector 5 is used to connect the main oil circuit, and the auxiliary oil circuit connector 7 is used to connect the auxiliary oil circuit. The refueling connector 13 is used to connect the refueling pipe connected to the oil source. When refueling, the oil can enter the fuel tank 1 through the refueling connector 13.

[0049] The valve bodies of the oil pump 2 , the differential pressure automatic reversing valve 4 , and the electromagnetic reversing valve 6 are located below the mounting plate 11 .

[0050] Specifically, the oil pump 2 is usually arranged at the bottom of the oil tank 1 to pump out the grease in the oil tank 1. In this embodiment, a connecting frame 14 extending to the bottom of the oil tank 1 is connected below the mounting plate 11 corresponding to the mounting position of the motor 3. The oil pump 2 is connected to the lower end of the connecting frame 14. The output shaft of the motor 3 is connected to the oil pump 2 through a connecting shaft arranged along the extending direction of the connecting frame 14, thereby driving the oil pump 2 to work. The oil pump 2 in this embodiment adopts a gear pump, and a filter screen 9 is provided at the inlet of the oil pump 2. The filter screen 9 can filter out impurities in the lubricating oil in the oil tank 1, ensure the cleanliness of the lubricating oil entering the oil pump 2, and thus better play the lubricating role.

[0051] The differential pressure automatic reversing valve 4 is connected to the connecting frame 14. In this embodiment, the differential pressure automatic reversing valve 4 is arranged above the oil pump 2 and close to the oil pump 2. The oil inlet of the differential pressure automatic reversing valve 4 is connected to the outlet of the oil pump 2. For the compactness of the structure, the connecting channel between the oil inlet of the differential pressure automatic reversing valve 4 and the outlet of the oil pump 2 can be directly formed in the connecting frame 14. The oil return port of the differential pressure automatic reversing valve 4 is directly open, so that it can be connected with the oil tank 1, that is, the oil unloaded from the oil return port of the differential pressure automatic reversing valve 4 directly drips into the oil tank 1. The oil outlet of the differential pressure automatic reversing valve 4 forms a main oil port for connecting to an external main oil circuit. Specifically, the differential pressure automatic reversing valve 4 is connected to the main oil circuit connector 5 through a first connecting pipe 41, and the main oil circuit connector 5 forms a main oil port for connecting to an external main oil circuit.

[0052] An overflow valve 40 is connected between the oil inlet and the oil return port of the differential pressure automatic reversing valve 4, so that the output pressure of the electric lubrication pump can be set.

[0053] In order to monitor the output pressure of the oil outlet of the differential pressure automatic reversing valve 4 in real time, a pressure gauge 8 is provided on the main oil circuit connector 5, and the real-time oil pressure situation can be conveniently checked through the pressure gauge 8.

[0054] The electromagnetic reversing valve 6 in this embodiment is a normally unloaded two-position three-way reversing valve. The valve body of the electromagnetic reversing valve 6 is fixedly connected to the lower surface of the mounting plate 11 and is located on the upper part of the oil tank 1. The valve body in this embodiment is arranged vertically. Figure 6 As shown, the valve body of the electromagnetic reversing valve 6 is provided with a channel 61 through-through in the axial direction, and the driving member of the electromagnetic driving part of the electromagnetic reversing valve 6 extends from the opening at the upper end of the channel 61 into the channel 61 of the valve body to cooperate with the operation of the electromagnetic reversing valve 6. The lower end of the channel 61 forms the oil return port of the electromagnetic reversing valve 6, and the oil output from the oil return port of the electromagnetic reversing valve 6 can naturally drip into the oil tank 1 under the action of gravity, realizing the connection relationship between the oil return port of the electromagnetic reversing valve 6 and the oil tank 1. The valve body structure of the electromagnetic reversing valve 6 ensures the smoothness of the oil return from the oil return port when unloading.

[0055] The oil inlet and oil outlet of the electromagnetic reversing valve 6 are respectively arranged on the side wall of the valve body of the electromagnetic reversing valve 6 in a direction perpendicular to the axis of the channel 61 and are connected to the channel 61. The oil inlet of the electromagnetic reversing valve 6 is connected to the oil outlet of the differential pressure automatic reversing valve 4 through the second connecting pipe 62, and the oil outlet of the electromagnetic reversing valve 6 forms an auxiliary oil port for connecting to an external auxiliary oil circuit. Specifically, in this embodiment, the electromagnetic reversing valve 6 is connected to the auxiliary oil circuit connector 7 through the third connecting pipe 63, and the auxiliary oil circuit connector 7 forms an auxiliary oil port for connecting to an external auxiliary oil circuit.

[0056] The oil circuit control method of the electric lubrication pump is as follows: after the electric lubrication pump is turned on, when the motor 3 is powered, the motor 3 drives the oil pump 2 to work, and then the oil pump 2 pumps out grease from the oil tank 1 and enters the differential pressure type automatic reversing valve 4 from the oil inlet of the differential pressure type automatic reversing valve 4. At this time, the differential pressure type automatic reversing valve 4 is operated by the pressure of the incoming oil to connect the oil inlet and the oil outlet, and the oil return port is in a closed state. The oil is output from the oil outlet of the differential pressure type automatic reversing valve 4, and then supplied to the main oil circuit connected to the main oil circuit connector 5.

[0057] When the auxiliary oil circuit connected to the auxiliary oil circuit connector 7 needs to be supplied with oil, the electromagnetic reversing valve 6 is energized. After the electromagnetic reversing valve 6 is energized, the oil inlet and the oil outlet of the electromagnetic reversing valve 6 are connected, and the oil return port is in a closed state. Then part of the oil output from the oil outlet of the differential pressure automatic reversing valve 4 is diverted to the electromagnetic reversing valve 6, and then the oil is supplied to the auxiliary oil circuit through the oil outlet of the electromagnetic reversing valve 6. At this time, each friction pair corresponding to the main oil circuit and the auxiliary oil circuit can perform lubrication work.

[0058] When unloading is required, the motor 3 is powered off, and the oil inlet of the differential pressure automatic reversing valve 4 no longer receives oil. Under the action of the pressure difference, the oil outlet and the oil return port of the differential pressure automatic reversing valve 4 are connected, while the oil inlet is closed. At this time, the oil in the main oil circuit flows back to the oil tank 1 through the oil outlet and the oil return port of the differential pressure automatic reversing valve 4, completing the automatic unloading of the main oil circuit.

[0059] When the motor 3 is powered off, if the electromagnetic reversing valve 6 is not powered off at the same time, the oil in the auxiliary oil circuit will flow back to the oil tank 1 through the oil outlet and oil inlet of the electromagnetic reversing valve 6 and the oil outlet and oil return port of the differential pressure automatic reversing valve 4, thereby completing the unloading work of the auxiliary oil circuit. When the motor 3 is powered off, if the electromagnetic reversing valve 6 is powered off at the same time, the electromagnetic reversing valve 6 is reset so that the oil outlet and oil return port of the electromagnetic reversing valve 6 are connected, and the oil inlet of the electromagnetic reversing valve 6 is in a closed state. At this time, the oil in the auxiliary oil circuit flows back to the oil tank 1 through the oil outlet and oil return port of the electromagnetic reversing valve 6. It can be seen that after the motor 3 is powered off, the electromagnetic reversing valve 6 can complete the unloading of the auxiliary oil circuit whether it is powered on or not. The oil supply and unloading of the main oil circuit and the auxiliary oil circuit can be completed by controlling the power on and off of the motor 3 and the electromagnetic reversing valve 6, and the control is simple and convenient.

[0060] According to the working process of the electric lubrication pump described above, the working conditions of each oil circuit corresponding to the different on-off states of the motor 3 and the electromagnetic reversing valve 6 can be obtained as shown in the following table.

[0061] Motor power ups power ups Power outage Power outage Solenoid reversing valve Power outage power ups power ups Power outage Main oil circuit Oil supply output Oil supply output Unloading Unloading Auxiliary oil circuit Unloading Oil supply output Unloading Unloading

[0062] It can be seen that the electric lubrication pump in the present invention can effectively control the oil supply and unloading work of each oil circuit by turning on and off the power of the motor 3 and the electromagnetic reversing valve 6 through the connection method of the differential pressure automatic reversing valve 4 and the electromagnetic reversing valve 6, and when the motor 3 is powered off, the auxiliary oil circuit can be unloaded regardless of whether the electromagnetic reversing valve 6 is powered on or not, making the unloading of the auxiliary oil circuit more reliable.

[0063] This electric lubrication pump can be conveniently used in mechanical equipment that requires different lubrication cycles and different oil quantities for each friction pair. Only one electric lubrication pump is needed. It is not only easy to install, use and maintain, but also saves costs, and the pipeline layout is simple and clear.

[0064] like Figure 7 As shown, the lubrication device using the electric lubrication pump in this embodiment includes the aforementioned electric lubrication pump, the main oil circuit 10 connected to the oil outlet of the differential pressure automatic reversing valve 4, and the auxiliary oil circuit 20 connected to the oil outlet of the electromagnetic reversing valve 6. The main oil circuit 10 is provided with a main quantitative oil distributor 101 and a first pressure switch 102, and the auxiliary oil circuit 20 is provided with an auxiliary quantitative oil distributor 201 and a second pressure switch 202. The number of the main quantitative oil distributors 101 on the main oil circuit 10 can be specifically set as needed. The number of the auxiliary quantitative oil distributors 201 on the auxiliary oil circuit 20 can also be specifically set as needed.

[0065] The number of auxiliary oil circuits 20 can be determined according to the number of lubrication cycles required for the equipment. For example, if the equipment requires two lubrication cycles, one auxiliary oil circuit 20 can be set, which together with the main oil circuit 10 can meet the needs of the two lubrication cycles. The number of electromagnetic reversing valves 6 in the electric lubrication pump is equal to the number of auxiliary oil circuits 20 required, that is, one electromagnetic reversing valve 6 and one auxiliary oil circuit connector 7 are set for each auxiliary oil circuit 20. And each auxiliary oil circuit 20 can be provided with a plurality of auxiliary quantitative distributors 201 and second pressure switches 202.

[0066] Specifically, the oil inlet of the main quantitative oil distributor 101 is connected to the main oil circuit connector 5 through the main oil inlet pipe 103, and then connected to the oil outlet of the differential pressure automatic reversing valve 4. The main lubricating oil pipe 104 is connected to the oil outlet of the main quantitative oil distributor, and the first pressure switch 102 is arranged on the main oil inlet pipe. That is, the main oil inlet pipe 103, the main quantitative oil distributor 101, the first pressure switch 102 and the main lubricating oil pipe 104 form the main oil circuit 10; the oil inlet of the auxiliary quantitative oil distributor 201 is connected to the auxiliary oil circuit connector 7 through the auxiliary oil inlet pipe 203, and then connected to the oil outlet of the electromagnetic reversing valve 6. The auxiliary lubricating oil pipe 204 is connected to the oil outlet of the auxiliary quantitative oil distributor 201, and the second pressure switch 202 is arranged on the auxiliary oil inlet pipe. That is, the auxiliary oil inlet pipe 203, the auxiliary quantitative oil distributor 201, the second pressure switch 202 and the auxiliary lubricating oil pipe 204 form the auxiliary oil circuit 20.

[0067] The electric lubrication pump of the present invention can be integrated with one or more normally unloaded two-position three-way electromagnetic reversing valves 6 as needed. Correspondingly, two or more oil ports of the lubrication oil circuits can be formed on the outside. The oil port of each lubrication oil circuit can independently supply the quantitative distributor and the pressure switch to form independent fixed-point quantitative centralized lubrication devices.

[0068] The positions of the oil circuit interfaces, the differential pressure automatic reversing valve 4, and the electromagnetic reversing valve 6 relative to the oil tank 1 and the mounting plate 11 are arranged so that the contact points of all time-divided lubricating oil circuits are inside the electric lubricating pump, and all oil return ports are also arranged inside the electric lubricating pump. The outside of the electric lubricating pump is each independent quantitative lubricating oil circuit. Not only is the pipe layout simple, the installation is convenient and intuitive, and the use and maintenance are simple and clear.

[0069] During operation, except for the oil supply cycle of the main oil circuit being consistent with the power-on cycle of the oil pump motor, the oil supply cycles of the other auxiliary oil circuits can be set to any integer multiple of the oil supply cycle of the main oil circuit. It can be achieved that the oil demand of the friction pair of the same mechanical equipment varies greatly, and only one electric lubrication pump is used for oil supply, and the goal of "appropriate lubrication" can be achieved.

[0070] The two-position three-way solenoid reversing valve 6 that controls the oil supply cycle of each auxiliary oil circuit is of the normally unloaded type, that is, the solenoid reversing valve 6 is in the unloaded state when it loses power. This ensures that each oil circuit can be automatically unloaded smoothly after the pump is stopped. If a certain auxiliary oil circuit needs to be lubricated, the power-on time of the corresponding solenoid reversing valve 6 can be equal to the power-on time of the oil pump motor, that is, the solenoid reversing valve 6 does not need to be powered on with a delayed time, which is not only simple to control but also prolongs the service life of the solenoid reversing valve 6 and is not affected by changes in ambient temperature in winter and summer.

[0071] The lubrication device using the electric lubrication pump simplifies the oil supply and unloading control of each oil circuit, effectively ensures the reliability of the unloading work, and reduces the failure rate.

Claims

1. An electric lubrication pump, comprising Fuel tank (1); An oil pump (2) is arranged in the oil tank (1); A motor (3) is drivingly connected to the oil pump (2); A differential pressure automatic reversing valve (4), the oil inlet of which is connected to the outlet of the oil pump (2), the oil return port of which is connected to the oil tank (1), and the oil outlet of which forms a main oil port for connecting to an external main oil circuit; Features: Also includes The electromagnetic reversing valve (6) is a normally unloaded two-position three-way reversing valve, the oil inlet of the electromagnetic reversing valve (6) is connected to the oil outlet of the differential pressure automatic reversing valve (4), the oil return port of the electromagnetic reversing valve (6) is connected to the oil tank (1), and the oil outlet of the electromagnetic reversing valve (6) forms an auxiliary oil port for connecting to an external auxiliary oil circuit; After the electric lubrication pump is turned on, the motor (3) is powered to drive the oil pump (2) to work, and the oil pump (2) pumps oil from the oil tank (1) into the differential pressure type automatic reversing valve (4), and the oil is output from the oil outlet of the differential pressure type automatic reversing valve (4) and then supplied to the main oil circuit; When the auxiliary oil circuit needs to be supplied with oil, the electromagnetic reversing valve (6) is controlled to be energized to open the oil outlet, and a part of the oil output by the differential pressure automatic reversing valve (4) is diverted to the electromagnetic reversing valve (6), and then supplied to the auxiliary oil circuit through the oil outlet of the electromagnetic reversing valve (6); When unloading is required, the control motor (3) is powered off, and the oil supply to the differential pressure type automatic reversing valve (4) is stopped, and the oil in the main oil circuit flows back to the oil tank (1) through the differential pressure type automatic reversing valve (4), thereby completing the automatic unloading of the main oil circuit; When the motor (3) is powered off, if the electromagnetic reversing valve (6) is not powered off at the same time, the oil in the auxiliary oil circuit flows back into the oil tank (1) through the electromagnetic reversing valve (6) and the differential pressure automatic reversing valve (4), thereby completing the unloading work of the auxiliary oil circuit; When the motor (3) is powered off, if the electromagnetic reversing valve (6) is powered off at the same time, the electromagnetic reversing valve (6) is reset to open the oil return port, and the oil in the auxiliary oil circuit flows back into the oil tank (1) through the oil return port of the electromagnetic reversing valve (6); During operation, the oil supply cycle of the main oil circuit is consistent with the power supply cycle of the motor (3), and the oil supply cycle of the auxiliary oil circuit is set to any integer multiple of the oil supply cycle of the main oil circuit.

2. The electric lubrication pump according to claim 1, characterized in that: An overflow valve (40) is connected between the oil inlet and the oil return port of the differential pressure automatic reversing valve (4).

3. The electric lubrication pump according to claim 1, characterized in that: A main oil circuit connector (5) is provided on the oil outlet of the differential pressure automatic reversing valve (4), and an auxiliary oil circuit connector (7) is provided on the oil outlet of the electromagnetic reversing valve (6).

4. The electric lubrication pump according to claim 2, characterized in that: The opening of the oil tank (1) is matched and covered with a mounting plate (11), and the oil pump (2), the motor (3), the differential pressure automatic reversing valve (4), the electromagnetic reversing valve (6), the main oil circuit connector (5), and the auxiliary oil circuit connector (7) are all mounted on the mounting plate (11); the electromagnetic drive part of the motor (3), the electromagnetic reversing valve (6), the main oil circuit connector (5), and the auxiliary oil circuit connector (7) are located above the mounting plate (11), and the valve bodies of the oil pump (2), the differential pressure automatic reversing valve (4), and the electromagnetic reversing valve (6) are located below the mounting plate (11).

5. The electric lubrication pump according to claim 4, characterized in that: The motor (3) and the electromagnetic drive part of the electromagnetic reversing valve (6) are also covered with a cover (12).

6. The electric lubrication pump according to claim 4, characterized in that: A refueling connector (13) is also provided above the mounting plate (11).

7. The electric lubrication pump according to claim 4, characterized in that: A connecting frame (14) extending to the bottom of the oil tank (1) is connected below the mounting plate (11), the oil pump (2) is connected to the lower end of the connecting frame (14), and the differential pressure automatic reversing valve (4) is connected to the connecting frame (14).

8. The electric lubrication pump according to any one of claims 1 to 7, characterized in that: The valve body of the electromagnetic reversing valve (6) is vertically arranged on the upper part of the oil tank (1), and a channel (61) is axially penetrated through the valve body of the electromagnetic reversing valve (6), and the lower end of the channel (61) forms an oil return port of the electromagnetic reversing valve (6); The oil inlet and the oil outlet of the electromagnetic reversing valve (6) are respectively arranged on the side wall of the valve body of the electromagnetic reversing valve (6) in a direction perpendicular to the axis of the channel (61) and are communicated with the channel (61).

9. An oil circuit control method for an electric lubrication pump according to any one of claims 1 to 8, characterized in that: After the electric lubrication pump is turned on, the motor (3) is powered to drive the oil pump (2) to work, and the oil pump (2) pumps oil from the oil tank (1) into the differential pressure type automatic reversing valve (4), and the oil is output from the oil outlet of the differential pressure type automatic reversing valve (4) and then supplied to the main oil circuit; When the auxiliary oil circuit needs to be supplied with oil, the electromagnetic reversing valve (6) is controlled to be energized to open the oil outlet, and a part of the oil output by the differential pressure automatic reversing valve (4) is diverted to the electromagnetic reversing valve (6), and then supplied to the auxiliary oil circuit through the oil outlet of the electromagnetic reversing valve (6); When unloading is required, the control motor (3) is powered off, and the oil supply to the differential pressure type automatic reversing valve (4) is stopped, and the oil in the main oil circuit flows back to the oil tank (1) through the differential pressure type automatic reversing valve (4), thereby completing the automatic unloading of the main oil circuit; When the motor (3) is powered off, if the electromagnetic reversing valve (6) is not powered off at the same time, the oil in the auxiliary oil circuit flows back into the oil tank (1) through the electromagnetic reversing valve (6) and the differential pressure automatic reversing valve (4), thereby completing the unloading work of the auxiliary oil circuit; When the motor (3) is powered off, if the electromagnetic reversing valve (6) is powered off at the same time, the electromagnetic reversing valve (6) is reset to open the oil return port, and the oil in the auxiliary oil circuit flows back into the oil tank (1) through the oil return port of the electromagnetic reversing valve (6).

10. A lubrication device, characterized in that: It comprises an electric lubrication pump as claimed in any one of claims 1 to 8, a main oil circuit (10) connected to the oil outlet of a differential pressure automatic reversing valve (4), and an auxiliary oil circuit (20) connected to the oil outlet of an electromagnetic reversing valve (6); a main quantitative oil distributor (101) and a first pressure switch (102) are provided on the main oil circuit (10), and an auxiliary quantitative oil distributor (201) and a second pressure switch (202) are provided on the auxiliary oil circuit (20).

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