Control device and control method for reducing working temperature of electric pump and electric pump

Abstract

The invention relates to the technical field of electric glue supply, and particularly discloses a control device for reducing the working temperature of an electric pump, which comprises a brake for locking an electric motor and a control module for controlling whether the brake is locked or not, and controlling the brake to lock the input end or the output end of the electric motor, and reducing or stopping the input of the electric motor after the brake locks the input end or the output end of the electric motor. A control method includes starting a brake to brake an electric motor of the electric pump when the electric pump is in a hold-down pause stage. The electric pump comprises an electric motor and a pump body, and further comprises the control device for reducing the working temperature of the electric pump. The scheme is used for solving the problem that in the prior art, temperature rise is too fast in the pressure building process in the working process of an electric pump.

Description

Technical Field

[0001] The invention relates to the technical field of electric glue supply, and in particular to a control device and a control method for reducing the working temperature of an electric pump, and an electric pump. Background Art

[0002] Adhesives are widely used in packaging, automobiles, new energy, electronics, construction and other fields. Adhesive delivery pumps are usually driven by a pneumatic motor to reciprocate and drive the lower pump body. When the lower pump body reciprocates, it can continuously supply adhesive. The combination of pneumatic motor + lower pump body is called a pneumatic glue pump. Pneumatic glue pumps have three major problems: low efficiency (about 15%), high noise (high-pressure glue pumps are usually greater than 85 decibels) and easy condensation.

[0003] Compared with the traditional pneumatic glue pump, the efficiency of the electric glue pump (electric motor + lower pump body) is increased from about 15% of the pneumatic glue pump to about 70%, and the noise is reduced from about 85 decibels to about 70 decibels. At the same time, the condensation problem is also eliminated. The pumping of this type of electric glue pump is shown in the "An Electric Glue Driving Device" with the patent announcement number CN212167989U applied for in 2019. In this disclosed patent technology, the electric motor used is a screw nut transmission method with a motor. The reciprocating movement of the screw nut along the screw drives the plunger rod of the lower pump body to move back and forth, thereby realizing continuous glue supply. There are also electric motors of electric glue pumps that use a servo motor + gear set. The servo motor provides power to the gear set, and the gear set is used to increase the torque. With the cooperation of the gear rack of the gear set, reciprocating linear output is realized, which drives the plunger rod of the lower pump body to move back and forth, thereby realizing continuous glue supply. In addition to the above effects, the current electric glue pump also has the following beneficial effects:

[0004] 1) It provides more precise flow and pressure control, which is critical to ensuring high quality adhesive application.

[0005] 2) Electric glue pumps are easy to integrate with modern manufacturing execution systems (MES) and enterprise resource planning (ERP) systems to achieve remote monitoring and control, promoting the automation and intelligence of production processes.

[0006] Therefore, the electric glue pump solution has the characteristics of high efficiency, low noise, environmental protection and reliability, and has great market prospects and social value.

[0007] However, with the iteration and upgrading of products, the pumping requirements for high-viscosity adhesives in the market have changed. It is necessary to ensure that the downstream of the electric pump output pipeline can obtain adhesive with higher pressure in time (usually the pressure ranges from 70 to 300 bar) to ensure a higher flow rate / high flow rate of the adhesive sent to the downstream. At the same time, when supplying glue, it is necessary to ensure that the glue supply output end provides a long-term and stable supply to the downstream. The electric glue pump is required to work-hold pressure cycle mode. When working, the electric glue pump pumps glue to the output pipeline, and when holding pressure, the downstream valve of the output pipeline is closed, and the output pipeline is maintained at the set pressure. At this time, although the electric glue pump has no output, it needs to withstand the pressure at the output end; the pressure will react on the lower pump body and be transmitted to the motor of the electric glue pump, thereby forcing the motor to withstand large torque without motion output when holding pressure. Without output, the input energy of the motor is basically converted into heat energy, which brings about rapid heating, which is not conducive to extending the life of the motor. The current conventional method is to set a cooling fan to continuously cool the motor, but the temperature of the motor is very high when it is in a stopped state, and both the motor and the cooling fan consume energy, which increases the energy consumption and also causes a lot of noise due to the operation of the cooling fan.

[0008] Taking actual application as an example, when the ambient temperature is room temperature and the working pressure of the electric glue pump output pipeline is about 180 bar, a frameless motor is used as the electric motor, and it runs for 3 hours in a cyclic working mode of working for 20 seconds and holding pressure for 40 seconds. The motor temperature rises to nearly 57°C during the holding pressure stage. The reason for the heat during the holding pressure stage is that the motor inputs reverse torque but has no output, so the input energy is basically converted into heat energy, causing the motor to heat up severely during the holding pressure stage, reducing the efficiency and service life of the motor, and restricting the intermittent pumping of the motor under holding pressure. This is also the extremely important reason why pneumatic motors still occupy the main market for intermittent pumping with high viscosity, high pressure and high flow rate in the current market.

[0009] Although the heating problem can be alleviated by adding cooling fans in the environment, this requires high cooling. Adding cooling not only further increases energy consumption, but also brings noise problems, which greatly increases the pumping cost of electric rubber pumps under intermittent pressure. Summary of the invention

[0010] The present invention aims to provide a control device for reducing the working temperature of an electric pump, so as to solve the problem of excessively rapid temperature rise during the pressure holding process of the electric pump in the prior art.

[0011] In order to achieve the above object, the present invention adopts the following technical scheme:

[0012] A control device for reducing the working temperature of an electric pump comprises a brake for locking an electric motor and a control module for controlling whether the brake is locked. The control module is used to control the brake to lock the input end or output end of the electric motor when the electric pump is in a pressure holding pause stage, and reduce or stop the input of the electric motor after the brake locks the input end or output end of the electric motor.

[0013] The principle and advantage of this scheme are: when this scheme is adopted, in the pressure-holding pause stage, the input of the electric motor itself is first used to counteract the torque of the pressure-holding until the electric motor has no actual output. Then, when the control module determines that the electric motor is already in the pressure-holding state, the brake is controlled to lock the input or output end of the electric motor, thereby utilizing the braking performance of the brake to counteract the torque caused by the pressure-holding, so that the electric motor can maintain a state of reduced input or even no input for a long time in the pressure-holding pause stage, greatly reducing or even avoiding the heating of the electric motor caused by continued pressure holding, thereby greatly reducing the heat generated by the electric pump in the pressure-holding pause stage when it is working, which is equivalent to greatly reducing the working temperature of the electric pump, ensuring that the electric pump can still be used with high viscosity, high pressure, high flow rate and in the working-pressure-holding pause cycle stage, thereby ensuring the service life, control accuracy and energy saving and noise reduction of the electric pump.

[0014] From the perspective of rubber pumping in this field, conventional rubber pumping is continuous low-flow pumping with a slow pumping speed. There is no need to install a brake in the electric pump. Without the brake, the overall size of the electric motor becomes smaller, which is conducive to reducing the cost and promoting the use of electric pumps. In the field of pure electric motors, there are many cases where brakes are installed, such as the "an adjustable anti-rotation linear telescopic servo mechanism" with patent announcement number CN218771607U applied for in 2022, in which an electromagnetic holding brake is installed, and the patent announcement number CN204794540U applied for in 2015 discloses a servo motor brake installation structure which also discloses the installation of a brake in the motor, and the patent announcement number CN209472496U applied for in 2019 discloses a small low-voltage servo motor brake. These motors are all disclosed to have brakes, but in the prior art, brakes are installed on motors for safety protection when the motor loses power, so that the brake can quickly clamp the motor that suddenly loses power to avoid the danger of the motor's output continuing to output under inertia, thereby achieving safety protection in emergency situations.

[0015] In the present solution, the brake is no longer an emergency start when the motor loses power, but is intermittently started as a regular working part. Through this solution, the temperature of the electric motor will not rise too much when the electric pump is in a stopped state, which will affect the service life of the electric motor, thereby ensuring the service life of the electric motor; at the same time, when the brake is started, unlike the existing brake that locks the output under rotation, the present solution first allows the output of the electric motor itself to put the entire electric pump in a basic static state with no output, and then allows the brake to lock the input or output end of the electric motor, ensuring that the brake is locked in a smooth manner, thereby ensuring the locking quality of the brake under intermittent use, ensuring that both the brake and the electric motor can take into account the service life, thereby ensuring the long-term use of the electric pump in the working-pressure-holding pause cycle working mode of such adhesives.

[0016] Preferably, as an improvement, a monitoring module for monitoring the rotation speed of a rotating part in the electric motor is further included, and the monitoring module transmits monitoring data to the control module to realize real-time monitoring of the rotation speed of the rotating part in the electric motor.

[0017] Preferably, as an improvement, the monitoring module is also used to monitor the outlet pressure of the electric pump and the reciprocating operation frequency of the electric pump / the outlet flow rate of the electric pump.

[0018] Preferably, as an improvement, the conditions for the control module to control the brake to start braking include: condition one, the speed of the rotating part of the electric motor is lower than the set value for a continuous set time; condition two, the outlet flow of the electric pump is lower than the set value for a continuous set time or the outlet pressure change rate of the electric pump is lower than the set value for a continuous set time; this scheme sets conditions for the brake triggering braking to avoid the possibility of false triggering of the brake and avoid damage to the electric pump caused by false triggering.

[0019] The present invention also provides a control method for reducing the working temperature of an electric pump, wherein when the electric pump is in a pressure holding pause stage, a brake is started to brake an electric motor of the electric pump.

[0020] Preferably, as an improvement, the conditions that need to be met when the brake is turned on include: Condition 1, the speed of the rotating parts of the electric motor is lower than the set value for a continuous set time; Condition 2, the outlet flow of the electric pump is lower than the set value for a continuous set time or the outlet pressure change rate of the electric pump is lower than the set value for a continuous set time; This scheme sets conditions for the brake triggering braking to avoid the possibility of false triggering of the brake and avoid damage to the electric pump caused by false triggering.

[0021] The present invention also provides an electric pump, comprising an electric motor and a pump body, and also comprising the control device for reducing the working temperature of the electric pump.

[0022] Preferably, as an improvement, the electric motor includes a motor body and a reduction gear assembly driven by the rotating main shaft of the motor body, the reduction gear assembly uses a rack as an output, the movement of the rack drives the pump body to work, and the brake is installed on the motor body to lock the rotating main shaft; this solution brakes the rotating main shaft of the motor body by using a brake, so that the braking is performed from the source of the electric motor, which helps to ensure the braking effect.

[0023] Preferably, as an improvement, the electric motor adopts a frameless motor, and the brake is used to brake the rotor of the frameless motor.

[0024] When this solution is adopted, the frameless motor has a stator, a rotor, a nut and a lead screw as an output. The entire frameless motor is an integrated direct drive solution of the lead screw nut and the motor rotor, which has the advantages of small axial size and simple structure.

[0025] Preferably, as an improvement, the output of the frameless motor is the linear movement of the screw, and an anti-rotation component is installed on the frameless torque, the anti-rotation component includes a rolling body and a guide groove, the rolling body can roll in the guide groove, the guide groove is parallel to the axis of the screw, one of the rolling body and the guide groove is installed on the screw, and the other is fixedly installed relative to the electric motor housing.

[0026] Beneficial effect: The output of the frameless motor with a rotor is the linear output of the screw. In order to ensure high-precision control of the linear output of the screw, the anti-rotation component is provided with rolling bodies and guide grooves. The cooperation of the rolling bodies and the guide grooves can guide the axial movement of the screw, ensuring the stability and accuracy of the linear movement. The cooperation between the guide grooves and the rolling bodies can avoid sliding friction during the guiding process, thereby reducing the wear rate. Especially in the case of the electric pump of this scheme working and the electric motor needs to withstand a large torque when there is pressure build-up, the presence of rolling bodies will undoubtedly have an outstanding effect on reducing wear.

[0027] Preferably, as an improvement, the anti-rotation assembly includes a fixedly mounted guide seat, a guide groove is arranged on the guide seat, the central axis of the rolling body is fixed on the screw, and the outer ring of the rolling body is used to roll in the guide groove, so as to take into account both the guiding performance and the cost.

[0028] Preferably, as an improvement, an adapter sleeve is fixed on the screw, and the adapter sleeve and the screw are matched in a concave-convex manner. There are multiple rolling bodies, and the multiple rolling bodies are located in the circumferential direction of the adapter sleeve. The center axis of the rolling body passes through the radial hole on the adapter sleeve and is fixedly connected to the screw, and the center axis and the radial hole are gap matched.

[0029] Beneficial effect: When this solution is adopted, because the electric motor needs to withstand a large torque during the pressure-holding pause stage, the torque will be transmitted to the screw, and the rolling elements installed on the screw will also withstand the torque. The farther away from the center of the screw, the greater the force, and the greater the force acts on the adapter sleeve. On the one hand, even if the radial hole port of the adapter sleeve is worn due to long-term torque, the conversion sleeve can be directly replaced to reduce replacement costs. On the other hand, due to the concave-convex fit between the adapter sleeve and the screw, the large torque borne by the adapter sleeve can be quickly transmitted to the thicker part of the screw structure through the fixed connection between the adapter sleeve and the screw, thereby avoiding the problem of excessive force on the weak area of ​​the screw in a short period of time and increasing the risk of damage.

[0030] Preferably, as an improvement, an oil adding channel is provided on the guide seat, and the oil adding channel can face the oil filling hole provided on the nut, so as to facilitate the addition of lubricating oil to the matching position of the nut and the lead screw through the oil adding channel.

[0031] Preferably, as an improvement, the nut is limited by a limiting structure that rotates synchronously with the nut, and an oil passage is provided on the limiting structure. An annular groove is provided on at least one end face of the limiting structure opposite to the nut, and the annular groove connects the oil passage and the oil filling hole. One end of the oil passage can face the oil filling passage to make the addition of lubricating oil simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the electric pump structure according to an embodiment of the present invention.

[0033] Figure 2 It is a line graph of temperature change and temperature difference change of test A and test B in embodiment 1 of the present invention.

[0034] Figure 3 This is a temperature variation diagram of Test C in Example 1 of the present invention.

[0035] Figure 4 This is a temperature variation diagram of Experiment D in Example 1 of the present invention.

[0036] Figure 5 This is a temperature variation diagram of Test E in Example 1 of the present invention.

[0037] Figure 6 It is a schematic diagram of the three-dimensional structure of the electric motor in the fourth embodiment.

[0038] Figure 7 for Figure 6 Rear view of.

[0039] Figure 8 It is a schematic axial section diagram of the motor body in the fourth embodiment.

[0040] Fig. 9It is a schematic diagram of the three-dimensional structure of the electric motor in the fifth embodiment.

[0041] Fig.10 for Fig. 9 Schematic diagram of the axial section.

[0042] Fig.11 This is a schematic diagram of the three-dimensional structure of the fifth embodiment, which only shows the combination of the lead screw, the guide seat, and the adapter sleeve.

[0043] Fig.12 for Fig.11 main view.

[0044] Fig.13 for Fig.12 AA rotated section view in.

[0045] Fig.14 for Fig.11 Exploded diagram of the lead screw, guide seat, and adapter sleeve.

[0046] Fig.15 for Fig.14 Schematic diagram of the three-dimensional structure after rotating 90°. DETAILED DESCRIPTION

[0047] The following is further described in detail through specific implementation methods:

[0048] The reference numerals in the drawings of the specification include: electric motor 10 , lower pump body 20 , brake 30 , brake disc 301 , brake adapter disc 302 , electric pump outlet 201 , encoder 40 , glue source 50 , rotating member 101 .

[0049] Embodiment 4: servo motor body 1 , housing 11 , rotating main shaft 101 , driving gear 102 , reduction gear assembly 2 , first transmission gear 21 , first transmission pinion 22 , second transmission gear 23 , second transmission pinion 24 , rack 25 .

[0050] Embodiment 5: housing 11 , stator 12 , rotor 101 , ball screw 13 , oil filling hole 131 , lead screw 14 , guide seat 15 , guide groove 151 , oil filling channel 152 , rolling element 16 , adapter sleeve 17 , limit sleeve 18 , oil passage 181 , annular groove 182 .

[0051] The embodiment is basically as shown in the attached Figures 1 to 15 shown.

[0052] Embodiment 1

[0053] A control device for reducing the working temperature of an electric pump comprises a brake for locking an electric motor in the electric pump, a control module for controlling whether the brake is locked, and a monitoring module for monitoring working parameters and output parameters of the electric pump.

[0054] The working parameters and output parameters of the electric pump include the speed of rotating parts in the electric motor (for example, if the electric motor has a rotor, the rotating part is the rotor, and the rotor speed is monitored; if the electric motor has a rotating main shaft, the rotating main shaft is not a rotating part, and the speed of the rotating main shaft is monitored), the outlet pressure of the electric pump, the outlet flow rate of the electric pump, the reciprocating operation frequency of the electric pump, the outlet flow rate, etc.

[0055] The control module controls the electric pump to cycle between working and pressure holding pause. During the working stage, the electric motor of the electric pump starts to drive the lower pump body of the electric pump to work, thereby realizing continuous pumping of the adhesive. During the pressure holding pause stage, the control module controls the electric motor to have no output, thereby ensuring that the lower pump body does not work.

[0056] The control module is used to control the brake to lock the input or output end of the electric motor after the electric pump has entered the pressure-holding pause stage. After the brake locks the input or output end of the electric motor (in this embodiment, the brake locks the rotating parts on the electric motor after braking), the control module reduces or stops the input of the electric motor, so that the remaining pressure-holding pause stage only relies on the brake to overcome the torque caused by the pressure holding, ensuring that the lower pump body of the electric pump does not work at all, or mainly relies on the brake to overcome the torque caused by the pressure holding, allowing the electric motor to assist in overcoming the torque, ensuring that during the pressure-holding pause stage, the lower pump body does not work, while greatly reducing the heat generated by the electric motor to overcome the pressure-holding torque.

[0057] It also includes a monitoring module for monitoring the rotational speed of rotating parts in the electric motor. The monitoring module transmits monitoring data to the control module to realize real-time monitoring of the rotational speed of rotating parts in the electric motor, ensuring that the control module is aware in time that the electric motor is in a pressure-holding state, thereby facilitating timely initiation of braking.

[0058] The conditions for the control module to control the brake to open include: Condition 1, the speed of the rotating part of the electric motor is lower than the set value for a continuous set time, such as the speed of the rotating part gradually decreases to below the A value and continues at the speed for Bs (Bs is the duration, and the actual time can be adjusted according to the speed of the electric motor when it is working, such as adjusting B seconds to 1s, 2s, 3s, 4s, etc.); Condition 2, the outlet flow of the electric pump is lower than the set value for a continuous set time or the outlet pressure change rate of the electric pump is lower than the set value for a continuous set time, such as the outlet flow of the electric pump approaches zero and remains unchanged for B seconds, the outlet pressure of the electric pump remains unchanged for B seconds, and the outlet pressure change rate of the electric pump approaches zero and remains unchanged for B seconds; by setting conditions for the brake triggering braking, the possibility of false triggering of the brake can be avoided, and damage to the electric pump caused by false triggering can be avoided.

[0059] When this embodiment is adopted, by limiting the application scenarios of the brake, breaking the conventional way of starting the brake only in emergency situations, and turning the start and stop of the brake as a regular frequent control, the brake is used to brake the rotating parts that no longer rotate after the electric motor stops, ensuring the long-term frequent braking start and stop work of the brake and ensuring reliable braking and locking of the rotating parts under long-term and frequent use, ensuring that the brake is used for most of the time in the pressure-holding pause stage (in actual application, the pressure-holding pause time is only the time for the electric motor to overcome the torque by itself, which can be controlled within B seconds, and the remaining pressure-holding pause time can be completely braked by the brake, and the braking time of the brake can often account for more than 80% of the pressure-holding time) to overcome the pressure-holding torque by braking, ensuring that the electric motor can stop working in the pressure-holding pause stage after the brake is started, thereby avoiding the heat and energy consumption caused by the work of the electric motor, and achieving energy saving.

[0060] After the electric motor does not work for most of the time during the pressure holding pause stage, the electric motor no longer generates additional heat, thereby ensuring that the operating temperature of the entire electric pump is greatly reduced. When the ambient temperature is not higher than normal temperature, the cooling fan configured in the prior art to cool the electric motor can be omitted, thereby reducing costs.

[0061] Taking the specific verification tests A and B as examples, two identical electric pumps are taken. The electric motors of the electric pumps are both frameless motors. The frameless motors can use excitation to brake the rotor. At the same time, the frameless motor of test B is equipped with a brake that can brake the rotor. The two electric pumps of tests A and B are allowed to work for more than 3 hours in exactly the same working environment (ambient temperature 20℃-22℃), in exactly the same working mode (working 20s-holding pressure 40s cycle) and under exactly the same working pressure (working pressure is 180bar, which is the pressure that needs to be maintained on the output pipeline of the electric pump).

[0062] During the more than three-hour test process, Test A used the motor's own excitation to brake the vehicle during each 40-second pressure-holding stage, while Test B used the frameless motor's excitation to brake the motor rotor at the beginning of the pressure-holding stage until the rotor came to a complete stop during the pressure-holding stage. The brake was then activated to brake the rotor. After the brake was applied, the input to the frameless motor was stopped, allowing the brake to independently withstand the pressure-holding torque.

[0063] Specifically, the brake activation conditions of Test B are as follows: Condition 1) the rotor speed is reduced to less than 3RPM, Condition 2) the rotor speed change rate is less than 0.01RPM / s, Condition 3) the electric pump outlet pressure change rate is less than 0.001bar / s, and after satisfying Conditions 1)-3) for a duration of more than 1 to 3 seconds, ensure that the rotor has stopped rotating by utilizing the excitation brake, and then activate the brake mode to allow the brake to resist the torque caused by the pressure holding. During the pressure holding stage, the time for utilizing the brake to resist the torque caused by the working pressure occupies most of the pressure holding time (in the 40 seconds of pressure holding, the time for utilizing the frameless motor excitation braking is about 3s, and the braking time for the brake is about 37s), so that the frameless motor is completely paused for most of the time during the pressure holding stage, thereby avoiding the heat caused by the pressure holding of the frameless motor.

[0064] The test process is to monitor the winding temperature of the frameless motor in real time, record the average temperature in each cycle, and draw a temperature change graph based on the temperature of each cycle (the temperature can be the average temperature in each cycle or the temperature at the end. This test uses the average temperature obtained by averaging multiple groups of temperatures tested in each 1-minute cycle). The specific test records are shown in the following table. The temperature changes and temperature difference changes drawn according to the following table are shown in the figure below. Figure 2 shown.

[0065] Test process record sheet for test A and test B

[0066]

[0067]

[0068]

[0069] From the test results of Test A and Test B, it can be seen that after working continuously for more than 3 hours in the mode of working for 20 seconds and holding pressure for 40 seconds, the winding temperature of Test B after braking by brake intervention in the holding pressure stage was only below 43°C, while Test A relied on excitation braking throughout the holding pressure stage, and the winding temperature exceeded 55°C, even reaching 57°C.

[0070] At present, the normal working state of high-viscosity and high-pressure pumping is continuous operation for more than 3 hours. Under this normal condition, the winding temperature of the frameless motor of test A has reached 57°C, which has a great negative impact on the life of the motor. According to the trend in the attached figure, if the operation continues, the temperature will continue to rise, which will greatly affect the life of the frameless motor.

[0071] In contrast, Test B in the present embodiment adds and controls the brake so that the maximum temperature does not exceed 43°C after 3 hours of continuous operation, which significantly reduces the temperature of the frameless motor during pumping operation and helps to achieve intermittent pumping of the electric motor under high viscosity and high pressure conditions. After adopting the scheme of Test B, not only the temperature is reduced, but also the energy consumption caused by the excitation braking of the frameless motor is greatly saved, which helps to promote energy conservation and environmental protection. In addition, under the scheme of Test B, the maximum temperature can be kept below 43°C without the need for a cooling fan, and the cooling fan can be omitted in actual applications, thereby reducing costs and reducing the noise when the electric pump is working.

[0072] In addition, in Test B, it is clearly seen that after 3 hours of continuous operation, the temperature rise rate of the winding slows down. In order to verify whether the slow temperature rise trend is still maintained if the test is continued for a longer time under the scheme of Test B, the inventors conducted Test C using the brake to brake in the pressure holding stage. The test conditions of Test C are the same as those of Test B, except that the test time is longer, which is extended to 4.5 hours. The temperature change diagram obtained from the test results is as follows: Figure 3 As shown, in test C, after working for 3 hours, the temperature was close to 43°C, and after working for 4.5 hours, the winding temperature was only around 45°C.

[0073] Under the excitation braking of the frameless motor, it can be seen from test A that the temperature rises in a sawtooth shape within 3 hours of the test. In order to avoid the accidental nature of the test, the inventors conducted test D with the same equipment, the same ambient temperature, and the same working pressure as test A. In test D, the winding temperature reached 51°C after 2 hours of testing (combined with Figure 4 The temperature change diagram of test D is basically consistent with that of test A, and the temperature rise of test D still shows a sawtooth change.

[0074] Therefore, the inventors conducted another test E. The difference between the test E and the test D is that the test time is longer, 400 minutes. The test results are as follows: Figure 5 As shown, Figure 5In the experiment, the winding temperature of the frameless motor still rises in a sawtooth shape. Combining experiments A, D and E, it can be seen that the change in temperature for frameless motors using excitation braking reflects the change in the frameless motor. After 4.5 hours of testing, the winding temperature was already at 60°C, and the temperature difference with that in experiment C during this period reached 15°C. Experiment E continued to test, and the temperature continued to rise. After 5.5 hours of testing, the temperature rise approached 64°C. This sawtooth temperature rise illustrates the instability of the frameless motor in the working-pressure holding cycle working mode, which is not conducive to the long-term use of the frameless motor in the working-pressure holding cycle mode. After the present invention uses the brake as shown in experiments B and C, the temperature is lower, and the temperature rise slows down after long-term use. The temperature rise of the frameless motor is also stable, which is more conducive to the use of the frameless motor in all aspects, and the superiority of the solution under the brake is more prominent.

[0075] Embodiment 2

[0076] The present invention provides a control method for controlling the control device for reducing the working temperature of the electric pump in Example 1. The specific control is: after the brake meets the braking conditions (the braking conditions are the same as the conditions in Example 1), the control module automatically triggers the brake to start braking, so as to achieve that the electric motor is locked by the brake during most of the time in the pressure-holding suspension stage to resist the pressure holding, thereby ensuring that the electric motor does not need to work during most of the time in the pressure-holding suspension stage.

[0077] If after the brake is applied, the monitoring module detects a small or trace amount of rubber outflowing from the outlet of the electric pump, and the outflow reaches the set value of the control module, the control module controls the electric motor to make a small input to cooperate with the brake to overcome the torque of the lower pump body, to ensure that no rubber flows out of the outlet of the electric pump during the pressure holding pause stage, thereby ensuring the accuracy of pumping the rubber.

[0078] Embodiment 3

[0079] This embodiment provides an electric pump, including an electric motor and a lower pump body, wherein the electric motor is used to drive the lower pump body to work to achieve continuous material pumping, and also includes the control device of embodiment 1 to reduce the working temperature of the electric pump.

[0080] Embodiment 4

[0081] Based on the third embodiment, this embodiment further describes in detail the specific structure of installing the brake 30 on the electric motor 10. Taking the electric motor 10 including the motor body and the reduction gear assembly 2 as an example, the specific description is as follows:

[0082] Combination Figures 6 to 8The electric motor 10 includes a servo motor body 1 and a reduction gear assembly 2. The output of the servo motor body 1 is a rotating main shaft 101 that can rotate forward and reverse. The rotating main shaft 101 drives the reduction gear assembly 2 to reduce speed and finally outputs linearly with a rack 25. The rack 25 drives the lower pump body 20 as the output of the electric motor 10. In a specific implementation scheme, the lower pump body 20 adopts a plunger pump. For example, the plunger pump is constructed as a high-pressure plunger pump with patent announcement number CN218266205U. The rack 25 is fixedly connected to the driving rod of the plunger pump, so that the reciprocating movement of the rack 25 drives the reciprocating movement of the driving rod to achieve continuous pumping of glue.

[0083] The brake 30 is installed on the motor body for locking the rotating main shaft 101. Specifically, one end of the brake 30 is fixed in the housing 11 of the motor body, and the brake disc 301 (such as the armature of the disc electromagnetic brake 30) at the other end of the brake 30 is fixed on the brake adapter disc 302, and the brake adapter disc 302 is fixed on the rotating main shaft 101, so that the brake disc 301 brakes the rotating main shaft 101 through the brake adapter disc 302 during braking.

[0084] In this embodiment, the rotating main shaft 101 of the motor body is braked by the brake 30, so that the power source of the electric pump is controlled during braking, which helps to ensure the braking effect.

[0085] In a specific embodiment, the relationship between the rotating main shaft 101 and the reduction gear assembly 2 can be as follows:

[0086] A driving gear 102 is fixed on the rotating main shaft 101, and the reduction gear assembly 2 includes a first transmission shaft and a second transmission shaft rotatably connected to the casing, a first transmission gear 21 and a first transmission pinion 22 are fixedly mounted on the first transmission shaft, and a second transmission gear 23 and a second transmission pinion 24 are fixed on the second transmission shaft, the first transmission gear 21 of the first transmission shaft is meshed with the driving gear 102, and the first transmission pinion 22 is meshed with the second transmission gear 23, the reduction gear set also includes a rack 25 slidably connected to the casing, and the second transmission pinion 24 is meshed with the rack 25, the rotating main shaft 101 of the motor body drives the gears of the reduction gear assembly 2 to rotate for deceleration, and finally drives the rack 25 to move linearly after deceleration.

[0087] An encoder 40 is installed on the housing 11 of the motor body. The encoder 40 is used as a part of the monitoring module to monitor the rotation speed of the rotating main shaft 101 .

[0088] Embodiment 5

[0089] The difference between the fifth embodiment and the fourth embodiment lies in the difference of the electric motor 10. Figures 9 to 15The electric motor 10 of this embodiment takes a frameless motor with a stator 12 and a rotor 101 as an example, and is specifically described as follows:

[0090] The frameless motor includes a housing 11, a stator 12 fixed in the housing 11, a rotor 101 rotatably connected in the housing 11, a ball screw 13 that rotates synchronously with the rotor 101, and a lead screw 14 that moves axially in the ball screw 13. After the electric motor 10 energizes the stator winding, the rotor 101 rotates, thereby driving the nut 13 to rotate synchronously, so that the lead screw 14 can achieve linear output. In this embodiment, one axial end of the nut 13 is limited by a step machined in the rotor 101, and the other axial end of the nut 13 is limited by an annular limit sleeve 18 fixed on the rotor 101 (the annular limit sleeve 18 is threadedly connected to the rotor).

[0091] The brake 30 is installed in the housing 11, one end of the brake 30 is fixed in the housing 11, and the brake disc 301 (such as the armature of the disc electromagnetic brake 30) at the other end of the brake 30 is fixed on the brake adapter disc 302, and the brake adapter disc 302 is fixedly connected to the rotor 101, so that the brake disc 301 brakes the rotor 101 through the brake adapter disc 302 during braking.

[0092] In this embodiment, the rotor 101 is braked by the brake 30, so that the power source of the electric pump is controlled during braking, which helps to ensure the braking effect.

[0093] An encoder 40 is also mounted on the housing 11 of the frameless motor. The encoder 40 is used as a part of the monitoring module to monitor the rotation speed of the rotor 101 .

[0094] The frameless motor also includes an anti-rotation component, which includes a guide seat 15 fixedly mounted on the housing 11, and a rolling body 16 axially slidably connected to the guide seat 15, the center axis of the rolling body 16 is fixedly connected to the screw 14, the rolling center line of the rolling body 16 is the radial direction of the screw 14, there are multiple rolling bodies 16, and the multiple rolling bodies 16 are symmetrically arranged about the center of the screw 14, a guide groove 151 is opened in the guide seat 15, when the screw 14 moves, the outer ring of the rolling body 16 can roll along the guide groove 151, and the rolling body 16 in this embodiment is a bearing.

[0095] An adapter sleeve 17 is fixed on the lead screw 14, and the adapter sleeve 17 and the lead screw 14 are matched in a concave-convex manner. A radial hole is provided in the radial direction of the adapter sleeve 17. The central axis of the rolling body 16 passes through the radial hole on the adapter sleeve 17 and is fixedly connected to the lead screw 14. The central axis and the radial hole are clearance matched. A section of the central axis that is clearance matched with the radial hole is a smooth section, which facilitates the installation of the rolling body 16 and facilitates the transmission of the torque borne by the rolling body 16 to the adapter sleeve 17 through the smooth section.

[0096] In order to facilitate the addition of lubricating oil to the oil filling hole 131 on the ball screw nut 13 (the oil filling hole 131 is connected to the matching position of the lead screw 14 and the screw nut 13), an oil filling channel 152 is opened at the root position of the guide seat 15 close to the housing 11. The oil filling channel 152 can be an oil filling hole, an oil filling notch or an oil filling groove. The screw nut 13 is limited by a limiting structure on the electric motor that rotates synchronously with the screw nut 13. In this embodiment, the limiting structure is the limiting sleeve 18. The limiting sleeve 18 is processed with an oil passage 181 opened in the axial direction. The end surface of the limiting sleeve 18 opposite to the screw nut 13 is processed with an annular groove 182. The annular groove 182 connects the oil passage 181 and the oil filling hole. The end of the oil passage 181 away from the screw nut 13 can face the oil filling channel 152. The lubricating oil is extended from the oil adding channel 152 to one end of the oil passage 181, and then under the extrusion pressure, the lubricating oil passes through the oil passage 181 into the annular groove 182, and finally enters the filling hole 131 on the nut 13, thereby completing the addition of lubricating oil to the matching structure of the nut 13 and the lead screw 14.

[0097] The fifth embodiment of the present invention can not only meet the cooling requirement for the electric pump after the installation of the brake 30, but also ensure that the reciprocating output of the electric motor 10 is more precise through the design of the anti-rotation component, and can utilize the rolling of the rolling body 16 to withstand higher torque under reciprocating linear output without damage to components, which helps to extend the service life of the electric motor 10.

[0098] In addition, whether it is embodiment 4 or embodiment 5, the brake 30 is disposed in the motor housing 11, which helps to shorten the axial dimension of the entire electric motor 10, and then reduce the weight and volume of the electric motor 10 itself, which helps to further improve the advantage of the electric pump of this embodiment in the market.

[0099] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A control device for reducing the operating temperature of an electric pump, characterized in that: It includes a brake for locking the electric motor and a control module for controlling whether the brake is locked. The control module is used to control the brake to lock the input end or the output end of the electric motor when the electric pump is in a pressure-holding pause stage, and reduce or stop the input of the electric motor after the brake locks the input end or the output end of the electric motor.

2. A control device for reducing the operating temperature of an electric pump according to claim 1, characterized in that: It also includes a monitoring module for monitoring the rotation speed of a rotating part in the electric motor, and the monitoring module transmits monitoring data to the control module.

3. A control device for reducing the operating temperature of an electric pump according to claim 2, characterized in that: The monitoring module is also used to monitor the outlet pressure of the electric pump and the reciprocating operation frequency of the electric pump / the outlet flow rate of the electric pump.

4. A control device for reducing the operating temperature of an electric pump according to claim 3, characterized in that: The conditions for the control module to control the brake to open include: condition one, the speed of the rotating parts of the electric motor is lower than the set value for a continuous set time; condition two, the outlet flow of the electric pump is lower than the set value for a continuous set time or the outlet pressure change rate of the electric pump is lower than the set value for a continuous set time.

5. A control method for reducing the operating temperature of an electric pump, characterized in that: When the electric pump is in the pressure holding pause stage, the brake is activated to brake the electric motor of the electric pump.

6. A control method for reducing the operating temperature of an electric pump according to claim 5, characterized in that: The conditions that need to be met when the brake is turned on include: Condition 1, the speed of the rotating parts of the electric motor is lower than the set value for a continuous set time; Condition 2, the outlet flow of the electric pump is lower than the set value for a continuous set time or the outlet pressure change rate of the electric pump is lower than the set value for a continuous set time.

7. An electric pump, comprising an electric motor and a pump body, characterized in that: It also includes the control device for reducing the operating temperature of the electric pump as described in any one of claims 1-4.

8. An electric pump according to claim 7, characterized in that: The electric motor includes a motor body and a reduction gear assembly driven by the rotating main shaft of the motor body. The reduction gear assembly uses a rack as an output. The movement of the rack drives the pump body to work. The brake is installed on the motor body to lock the rotating main shaft.

9. An electric pump according to claim 7, characterized in that: The electric motor is a frameless motor, and the brake is used to brake the rotor of the frameless motor.

10. An electric pump according to claim 9, characterized in that: The output of the frameless motor is the linear movement of the screw. An anti-rotation component is installed on the frameless torque. The anti-rotation component includes a rolling body and a guide groove. The rolling body can roll in the guide groove. The guide groove is parallel to the axis of the screw. One of the rolling body and the guide groove is installed on the screw, and the other is fixedly installed relative to the electric motor housing.

11. An electric pump according to claim 10, characterized in that: The anti-rotation assembly comprises a fixedly mounted guide seat, a guide groove is arranged on the guide seat, a central axis of the rolling body is fixed on the lead screw, and an outer ring of the rolling body is used for rolling in the guide groove.

12. An electric pump according to claim 11, characterized in that: An adapter sleeve is fixed on the lead screw, and the adapter sleeve and the lead screw are matched in a concave-convex manner. There are multiple rolling bodies, and the multiple rolling bodies are located in the circumferential direction of the adapter sleeve. The central axis of the rolling body passes through the radial hole on the adapter sleeve and is fixedly connected to the lead screw, and the central axis and the radial hole are gap matched.

13. An electric pump according to any one of claims 11-12, characterized in that: An oil adding passage is arranged on the guide seat.

Images