Diaphragm pump

Abstract

The application relates to the technical field of diaphragm pumps, and discloses a diaphragm pump. The diaphragm pump comprises a pump body, a heating device, a temperature acquisition device and a control device; the heating device is used for heating the air in the inner cavity of the pump body; the temperature acquisition device is used for acquiring the temperature outside the pump and the temperature inside the pump; and the control device is used for starting the heating device to heat when the temperature outside the pump is lower than a first threshold temperature before the pump body is started, until the temperature inside the pump is higher than a second threshold temperature, and then starting the pump body. The embodiment of the application can make the diaphragm pump maintain good performance in a low-temperature environment and reduce the risk of service life reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diaphragm pumps, in particular to a diaphragm pump. BACKGROUND

[0002] The diaphragm pump is also called a control pump, which is a main type of actuator. The diaphragm pump can adopt different materials according to different liquid media, including nitrile rubber, chloroprene rubber, fluorine rubber, polyvinylidene fluoride, and polytetrafluoroethylene, to meet different needs. The diaphragm pump can be placed in various special occasions to pump various media that cannot be pumped by conventional pumps. However, in a low-temperature environment, the lubricating grease of the bearing inside the diaphragm pump may freeze. The frozen lubricating grease cannot provide good lubrication conditions for the rolling body, which can easily lead to a decrease in the service life and performance of the diaphragm pump, causing property loss and affecting work efficiency. SUMMARY

[0003] The purpose of the present application is to provide a diaphragm pump that can maintain good performance and reduce the risk of service life decline in a low-temperature environment.

[0004] The present application provides a diaphragm pump, comprising:

[0005] a pump body;

[0006] a heating device configured in an inner cavity of the pump body, for heating the air in the inner cavity of the pump body;

[0007] a temperature collecting device for collecting the temperature outside the pump and the temperature inside the pump;

[0008] a control device electrically connected to the pump body, the heating device, and the temperature collecting device, for starting the heating device to heat before starting the pump body and when the temperature outside the pump is lower than a first threshold temperature, until the temperature inside the pump is higher than a second threshold temperature to start the pump body.

[0009] In some embodiments, the control device is further configured to configure the heating power of the heating device according to the temperature inside the pump, the temperature outside the pump, a target temperature, and a preset heating time, so that the heating device heats at a first target power within the preset heating time.

[0010] In some embodiments, the configuration of the heating power of the heating device according to the temperature inside the pump, the temperature outside the pump, a target temperature, and a preset heating time includes:

[0011] determining the internal energy increment of the pump body according to the temperature inside the pump and the target temperature;

[0012] determining the heat dissipation energy of the pump body according to the temperature inside the pump and the temperature outside the pump;

[0013] The first target power is determined according to the preset heating time length, the internal energy increment of the pump body, and the heat dissipation energy of the pump body.

[0014] In some embodiments, the internal energy increment of the pump body is calculated according to the following formula:

[0015] ,

[0016] wherein, is the internal energy increment of the pump body, is the density of the air in the pump body, and is the volume of the cavity in the pump body, is the specific heat capacity of the air in the pump body, is the target temperature, is the initial temperature in the pump;

[0017] The heat dissipation energy of the pump body is calculated according to the following formula:

[0018] ,

[0019] wherein, is the heat dissipation energy of the pump body, is the convective heat transfer coefficient, is the outer surface area of the pump body, and is the temperature in the pump at the tth moment, , , is the preset heating time length, is the temperature outside the pump;

[0020] The first target power is calculated according to the following formula:

[0021] ,

[0022] wherein, is the first target power.

[0023] In some embodiments, after starting the pump body, the control device is further configured to configure the heating power of the heating device according to the change trend of the temperature in the pump, so that the heating device heats at a heating power matching the change trend of the pump body.

[0024] In some embodiments, the configuration of the heating power of the heating device according to the change trend of the temperature in the pump comprises:

[0025] determining a temperature offset amount between an actual temperature offset value and a target temperature offset value; the target temperature offset value is a difference between the target temperature and a second threshold temperature, the actual temperature offset value is a difference between the target temperature and the temperature inside the pump when the temperature inside the pump is lower than the second threshold temperature or higher than the target temperature, the actual temperature offset value is a difference between the temperature inside the pump and the second threshold temperature when the temperature inside the pump is neither lower than the second threshold temperature nor higher than the target temperature;

[0026] compensating the heating power of the heating device in multiple stages according to the temperature offset amount to obtain a second target power, and causing the heating device to heat at the second target power.

[0027] In some embodiments, the calculation formula of the second target power is:

[0028] ,

[0029] ,

[0030] ,

[0031] wherein, the second target power is P2, the i-th compensation power is Pi, , the temperature offset amount is ΔT, the reference power is P0, the weight coefficient is αi, .

[0032] In some embodiments, the pump body comprises:

[0033] a base supporting the pump head;

[0034] a pump head fixed to the top side of the base and provided with a transmission mechanism extending to the inner cavity of the base;

[0035] a motor connected with the transmission mechanism and in transmission cooperation with the pump head through the transmission mechanism.

[0036] In some embodiments, the diaphragm pump further comprises a heat insulating body wrapped outside the pump body.

[0037] In some embodiments, the heating device is arranged in the inner cavity of the base, and the temperature collecting device is embedded in the base, and two collecting ends of the temperature collecting device are respectively in the inner cavity of the base and exposed outside the pump body.

[0038] The beneficial effects of the present application: the built-in heating device and the temperature acquisition device with double-channel temperature detection, the controller obtains the pump-in temperature and the pump-out temperature collected by the temperature acquisition device, and the heating device is started to heat before the pump body is started and when the pump-out temperature is lower than the first threshold temperature, until the pump-in temperature is higher than the second threshold temperature, the pump body is started, and the active temperature control preparation before the pump body is started is realized. Since the active temperature control preparation is performed before the pump body is started, the lubrication failure problem of the diaphragm pump when it is started in a low temperature environment is effectively solved, the lubricating grease is restored to a flowing state through the pre-heating mechanism, and wear caused by bearing dry friction is avoided, and the normal operation of the equipment in a low temperature environment can be ensured without manual intervention. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a structural schematic diagram of a diaphragm pump provided by the first embodiment of the present application.

[0040] Figure 2 is a flowchart of a material pile quality detection method provided by the embodiment of the present application.

[0041] Figure 3 is a structural schematic diagram of a diaphragm pump provided by the second embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0043] It should be noted that although the functional modules are divided in the device schematic diagram, and the logical order is shown in the flowchart, in some cases, the steps shown can be executed in a manner different from the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the description and claims and drawings are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0045] In one embodiment, referring to Figure 1 The diaphragm pump includes a pump body 10, a heating device 20, a temperature acquisition device 30 and a control device 40. The heating device 20 is arranged in the inner cavity of the pump body 10. The control device 40 is electrically connected to the pump body 10, the heating device 20 and the temperature acquisition device 30.

[0046] The heating device 20 is used to heat the inner cavity of the pump body 10. The pump body 10 is the main body topology of the diaphragm pump. The heating device 20 refers to a device that converts electrical energy into heat energy, which can be realized by using a resistance wire or a PTC heating rod, and the heat is transferred to the inner cavity of the pump body 10 through air convection.

[0047] The temperature collection device 30 is used to collect the pump outer temperature and the pump inner temperature. The temperature collection device 30 refers to a temperature measuring device with a double-channel detection function, which can be realized by using a double-probe thermocouple or a thermistor, and is arranged in the inner cavity of the pump body 10 and the external environment of the pump body 10, respectively. The pump inner temperature refers to the air temperature in the inner cavity of the pump body 10, which is used to represent the thermal state inside the pump body 10, and the pump outer temperature refers to the external temperature of the environment in which the pump body 10 is located, which is used to reflect the thermal influence of the environment on the pump body 10.

[0048] The control device 40 is used to start the heating device 20 before the pump body 10 starts and when the pump outer temperature is lower than a first threshold temperature, and to start the pump body 10 when the pump inner temperature is higher than a second threshold temperature. The control device refers to a micro-processing unit with logical judgment ability, which can be realized by using a PLC or an embedded chip, and controls the start-stop timing of the heating device 20 and the motor 13 of the pump body 10 by receiving the temperature signal.

[0049] The control device 40 acquires the pump outer temperature and the pump inner temperature collected by the temperature collection device 30. When the pump outer temperature is lower than the first threshold temperature, the control device 40 delays the start of the pump body 10 and activates the heating device 20. During the heating process, the pump inner temperature and the second threshold temperature are continuously compared, and when it is detected that the pump inner temperature reaches the grease phase transition point, i.e., the pump inner temperature is higher than the second threshold temperature, the start restriction is removed and the pump body 10 is started. This process avoids cold start through temperature gradient control, and at the same time prevents excessive heating from causing energy loss. For example, in a zero environment, the control device 40 first detects whether the pump outer temperature is lower than the freezing point, then starts the heating program to raise the pump inner temperature of the pump body 10 above the melting point of the grease, and finally allows the pump body 10 to start. In this way, the pre-heating mechanism restores the grease to a flowing state, avoiding wear caused by dry friction of the bearing, the double-temperature detection channel ensures that the internal and external temperature difference is within a reasonable range, preventing excessive heat loss, and the control device 40 automatically executes the heating-start process according to the preset program, without the need for manual intervention to ensure the normal operation of the equipment in a low-temperature environment.

[0050] In some embodiments, the control device 40 is also used to configure the heating power of the heating device 20 according to the pump inner temperature, the pump outer temperature, the target temperature and the preset heating time, so that the heating device 20 heats at a first target power within the preset heating time.

[0051] The target temperature refers to a pre-set temperature value that the inner cavity of the pump body 10 needs to reach, which can be input by a user or pre-set by the system, and serves as a control target of the heating process. The pre-set heating duration refers to a maximum time range allowed for completing the heating process, which can be set through experimental data or empirical values, and is used to constrain the adjustment range of the heating power. The heating power refers to the heat generated by the heating device 20 per unit time, which can be realized by adjusting the current or voltage, and is used to control the temperature rising rate of the inner cavity of the pump body 10.

[0052] Before the pump body 10 is started and when the pump outer temperature is lower than the first threshold temperature, the control device 40 dynamically calculates the first target power required by the heating device 20 by real-time acquisition of the pump inner temperature and the pump outer temperature, in combination with the target temperature and the pre-set heating duration, and controls. For example, when the pump outer temperature is low and the target temperature is high, the control device 40 generates a higher first target power to accelerate the temperature rise according to the temperature difference and the time limit, and when the pump outer temperature approaches the target temperature, the first target power is reduced to avoid overheating. This process converts the temperature parameter and the time parameter into a power control signal through a mathematical model, ensures that the heating device 20 operates at a power that is adapted to the current working condition within the pre-set heating duration, and makes the temperature of the inner cavity of the pump body 10 stable and tend to approach the target temperature. Thus, the heating power is accurately controlled according to the real-time temperature data and the pre-set conditions, avoiding the solidification of the lubricating grease inside the pump body 10 due to insufficient heating in a low-temperature environment, while preventing energy loss caused by excessive heating, realizing the rapid temperature rise of the inner cavity of the pump body 10 at the optimal power within a limited time, and ensuring the stable operation of the diaphragm pump in a low-temperature environment.

[0053] In some embodiments, referring to Figure 1 and Figure 2 , the method of configuring the heating power of the heating device 20 includes but is not limited to steps S201 to S203.

[0054] Step S201, determine the internal energy increment of the pump body 10 according to the pump inner temperature and the target temperature.

[0055] The internal energy increment of the pump body 10 refers to the heat required for the air inside the pump body 10 to rise from the initial temperature to the target temperature, which can be calculated through the density, volume, specific heat capacity of the air inside the pump body 10, and the temperature difference, and is used to quantify the energy that needs to be supplemented by the heating device 20.

[0056] In one specific embodiment, the calculation formula of the internal energy increment of the pump body 10 is:

[0057] ,

[0058] wherein, is the internal energy increment of the pump body 10, is the density of the air inside the pump body 10, and is the volume of the inner cavity of the pump body 10. Cp is the specific heat capacity of air in the pump body 10, Ttarget is the target temperature, Tinitial is the initial temperature in the pump.

[0059] In step S202, the heat dissipation energy of the pump body 10 is determined according to the temperature in the pump and the temperature outside the pump.

[0060] The heat dissipation energy of the pump body 10 refers to the heat dissipated by the pump body 10 due to the temperature difference between the inside and outside during the heating process, which can be calculated by the convective heat transfer coefficient, the outer surface area, the temperature difference between the inside and outside, and the heating time, and is used to correct the heating power to avoid heat loss.

[0061] In a specific embodiment, the calculation formula of the heat dissipation energy of the pump body 10 is:

[0062] ,

[0063] wherein, Q is the heat dissipation energy of the pump body 10, h is the convective heat transfer coefficient, A is the outer surface area of the pump body 10, Tinitial is the temperature in the pump at the i-th moment, , t is the preset heating time, Tambient is the temperature outside the pump.

[0064] In step S203, the first target power is determined according to the preset heating time, the internal energy increment of the pump body 10, and the heat dissipation energy of the pump body 10.

[0065] In a low-temperature environment, when the pump body 10 needs to be preheated before starting, the internal energy increment required to heat the air to the target temperature is calculated according to the temperature in the pump and the target temperature. At the same time, according to the real-time difference between the temperature in the pump and the temperature outside the pump, combined with the heat dissipation characteristics of the pump body 10, the heat dissipation energy caused by heat conduction and convection during the heating process is calculated. Further, the internal energy increment and the heat dissipation energy are added to obtain the total energy required by the heating device 20 within the preset heating time, and then the total energy is divided by the heating time to obtain the first target power required by the heating device 20. Through this process, the configuration of the heating power not only considers the realization requirement of the target temperature, but also takes into account the influence of actual heat dissipation on heating efficiency, thereby avoiding insufficient heating or time overrun due to heat loss. Therefore, the power required by the heating device 20 can be accurately calculated in a low-temperature environment, ensuring that the air in the inner cavity of the pump body 10 reaches the target temperature within the preset time, thereby effectively avoiding the delay of the pump body 10 starting or the abnormal operation caused by the solidification of the lubricating grease, while reducing energy waste and improving the controllability of the heating process.

[0066] In a specific embodiment, the calculation formula of the first target power is:

[0067] ,

[0068] wherein, is the first target power.

[0069] In a low-temperature environment, the air in the pump body 10 needs to be heated to a target temperature to maintain the fluidity of the lubricating grease. When calculating the energy required for heating by the internal energy increment formula, the air density, cavity volume, specific heat capacity, and target temperature difference need to be combined to quantify the energy demand for air temperature rise. At the same time, the heat dissipation energy formula calculates the total heat dissipation in the preset heating time by accumulating the heat dissipation loss caused by the temperature difference between the pump body 10 and the environment at each moment, combined with the convective heat transfer coefficient and the outer surface area. Finally, the sum of the internal energy increment and the heat dissipation energy is divided by the heating time to obtain the target power required to be output by the heating device 20, ensuring that the heating is completed within the set time and the heat dissipation effect is offset. In this way, the heating power required by the diaphragm pump before starting in a low-temperature environment can be accurately calculated, ensuring that the air in the pump body 10 quickly reaches the target temperature range, effectively preventing bearing wear caused by lubricating grease solidification, and improving the energy efficiency ratio of the heating process.

[0070] In some embodiments, after starting the pump body 10, the control device 40 is also used to configure the heating power of the heating device 20 according to the change trend of the temperature in the pump, so that the heating device 20 heats at a heating power matched with the change trend of the pump body 10.

[0071] The change trend of the temperature in the pump refers to the rate or direction of the change of the temperature in the inner cavity of the pump body 10 with time, which can be specifically realized by continuously collecting temperature data at multiple time points by the temperature collecting device 30 and calculating the difference or slope, for identifying the temperature fluctuation state during the operation of the pump body 10 and providing a basis for dynamically adjusting the heating power. The heating power matched with the change trend of the pump body 10 refers to the power output value dynamically adjusted according to the temperature change amplitude and direction, which can be specifically realized by using a proportional-integral-derivative control algorithm or a fuzzy control algorithm, for enabling the heating power to respond to the temperature change trend in real time and avoiding temperature overshoot or insufficient heating.

[0072] When the temperature of the inner cavity of the pump body 10 presents a rapid rising trend, the heating power can be dynamically adjusted to prevent overheating; when the temperature tends to be stable, the heating power can be maintained at a basic value to maintain thermal equilibrium. When the temperature presents a downward trend, the heating power can be stepped up to compensate for heat loss. For example, at the initial stage of the operation of the pump body 10, if it is detected that the temperature rises by more than 5°C per minute, the heating power can be gradually adjusted from 1000W to 600W; when the temperature change rate decreases to 1°C per minute, the power is maintained at 800W for constant temperature control. In this way, the problem of temperature control lag during the operation of the pump body 10 in a low-temperature environment is solved, and the secondary solidification of the lubricating grease or overheating failure caused by sudden temperature change is avoided. Through dynamic power adjustment, the required working temperature range of the bearing lubrication is ensured, energy waste is reduced, and the service life of the heating device 20 is prolonged.

[0073] In some embodiments, the heating power of the heating device 20 is configured according to the change trend of the temperature in the pump, including: determining the temperature offset between the actual temperature offset value and the target temperature offset value; compensating the heating power of the heating device 20 according to the temperature offset to obtain a second target power, and making the heating device 20 heat at the second target power. Wherein, the target temperature offset value is the difference between the target temperature and the second threshold temperature, when the temperature in the pump is lower than the second threshold temperature or higher than the target temperature, the actual temperature offset value is the difference between the target temperature and the temperature in the pump, when the temperature in the pump is not lower than the second threshold temperature and not higher than the target temperature, the actual temperature offset value is the difference between the temperature in the pump and the second threshold temperature.

[0074] The actual temperature offset value refers to the difference between the temperature in the pump and the target temperature or the second threshold temperature in different temperature intervals, which can be realized by real-time collection of the temperature in the pump by a temperature sensor and a difference calculation module, and is used to dynamically reflect the deviation degree of the current temperature from the ideal state. The target temperature offset value refers to the preset difference between the target temperature and the second threshold temperature, which can be realized by setting a fixed parameter through a control module, and is used to establish a reference for temperature regulation. The temperature offset refers to the difference between the actual temperature offset value and the target temperature offset value, which can be realized by a subtraction operation module to calculate the difference between the two, and is used to quantify the deviation between the current temperature state and the expected target. The multi-stage compensation refers to the use of a phased power adjustment strategy according to different ranges of the temperature offset, which can be realized by presetting multiple compensation coefficients and combining a weighted summation algorithm, and is used to realize fine adjustment of the heating power.

[0075] When the pump body 10 starts, the temperature inside the pump may fluctuate due to external environment or internal running state. By collecting the temperature inside the pump in real time and calculating the actual temperature offset value, it can be judged that the current temperature is in different intervals below the second threshold temperature, between the second threshold temperature and the target temperature, or above the target temperature. According to the interval, the corresponding actual temperature offset value calculation method is selected, and then compared with the target temperature offset value to obtain the temperature offset. The temperature offset is input into the multi-stage compensation module, which generates multiple compensation power components according to the positive and negative and size of the offset, and obtains the second target power through weighted summation. For example, when the temperature offset is large, the compensation power components are superimposed in a linear or nonlinear manner, so that the heating power responds quickly; when the offset is small, the compensation power components are weakened to avoid excessive adjustment. Based on this, the output power of the heating device 20 can dynamically match the temperature change trend of the pump body 10, and maintain the temperature stable. In this way, the problem of reduced lubrication performance of the diaphragm pump due to the solidification of the lubricating grease in a low temperature environment is solved, and through the heating power control strategy of dynamically matching the temperature change trend, it is ensured that the temperature inside the pump body 10 is always in a reasonable range, thereby prolonging the service life of the bearing and improving the running stability and efficiency of the diaphragm pump in low temperature working conditions.

[0076] In a specific embodiment, the calculation formula of the second target power is:

[0077] ,

[0078] ,

[0079] ,

[0080] wherein, is the second target power, is the i-th compensation power, , is the temperature offset, is the reference power, is the weight coefficient, .

[0081] First, the actual temperature offset value is determined based on the size relationship between the temperature in the pump and the second threshold temperature and / or the target temperature. When the temperature in the pump is lower than the second threshold temperature or higher than the target temperature, the actual temperature offset value is the difference between the target temperature and the temperature in the pump. When the temperature in the pump is not lower than the second threshold temperature and not higher than the target temperature, the actual temperature offset value is the difference between the temperature in the pump and the second threshold temperature. Then, the temperature offset amount is determined by the deviation between the actual temperature offset value and the target temperature offset value. After determining the current temperature offset amount, the multi-stage compensation power is generated according to the temperature offset amount, and the second target power is determined based on the generated multi-stage compensation power to perform multi-stage compensation on the heating power of the heating device 20. Specifically, the multi-stage compensation power is generated according to the temperature offset amount, and the second target power is determined based on the generated multi-stage compensation power. First, a first-order compensation power (i.e., a first compensation power) is calculated according to the temperature offset amount, a reference power, and a corresponding weight coefficient. Then, it is determined whether a second-order compensation power (i.e., a second compensation power) calculated according to the above formula is less than zero. If not, a third-order compensation power (i.e., a third compensation power) is calculated according to the above formula, and it is determined whether the third-order compensation power (i.e., the third compensation power) is less than zero. Similarly, this process is repeated until the (n+1)th-order compensation power (i.e., the (n+1)th compensation power) is less than zero. When the (n+1)th-order compensation power is less than zero, the first-order compensation power to the n-th-order compensation power is superimposed to obtain the second target power.

[0082] Referring to Figure 3 In one embodiment, the pump body 10 of the diaphragm pump includes a base 11, a pump head 12, and a motor 13. The base 11 supports the pump head 12. The pump head 12 is fixed to the top side of the base 11, and the pump head 12 is provided with a transmission mechanism 14 extending into the inner cavity of the base 11. The motor 13 is connected with the transmission mechanism 14, and the motor 13 is in transmission cooperation with the pump head 12 through the transmission mechanism 14.

[0083] The base 11 stably fixes the pump head 12 as a load-bearing structure, and the inner cavity thereof provides a sealed protection space for the transmission mechanism 14. The pump head 12 can be fixed on the top of the base 11 by bolts or welding. The transmission mechanism 14 arranged inside the pump head 12 extends downward into the inner cavity of the base 11, thereby forming a mechanical connection with the output shaft of the motor 13. The motor 13 is installed on the side or bottom of the base 11 and is engaged with the transmission mechanism 14 through a shaft coupling or a gear set to drive the pump head 12 to complete the reciprocating motion of the diaphragm. When the motor 13 is started, the power is transmitted to the pump head 12 through the transmission mechanism 14, causing the diaphragm to periodically deform to achieve medium delivery. Thus, by integrating the transmission mechanism 14 in the inner cavity of the base 11, the power transmission path is concentrated inside the rigid support structure, effectively reducing the mechanical vibration amplitude. At the same time, the fixing method of the pump head 12 and the base 11 avoids the deformation of the connecting parts caused by temperature changes, improving the stability of mechanical transmission in low-temperature environments.

[0084] Referring toFigure 3 In one embodiment, the diaphragm pump further comprises a thermal insulation body 50, which is wrapped on the outside of the pump body 10.

[0085] The thermal insulation body 50 refers to a heat-blocking structure for reducing the loss of heat from the inside of the pump body 10 to the outside environment. It can be implemented by using polyurethane foam, glass fiber or ceramic fiber composite material, thereby reducing the heat conduction efficiency through physical blocking.

[0086] The thermal insulation body 50 forms a thermal barrier layer by wrapping the outer surface of the pump body 10, thereby inhibiting the heat loss of the heated inner cavity of the pump body 10 to the low-temperature environment through the wall surface of the pump body 10. When the heating device 20 heats the air in the inner cavity of the pump body 10, the thermal insulation body 50 reduces the heat leakage, so that the temperature of the inner cavity of the pump body 10 reaches the target temperature range more quickly. At the same time, during the operation of the pump body 10, the thermal insulation body 50 continuously maintains the temperature difference between the inside and outside of the pump body 10, thereby avoiding the sudden drop of the temperature in the pump body 10 caused by the external low-temperature environment, and maintaining the fluidity of the bearing grease. Therefore, by adding the wrapped thermal insulation body 50, the surface heat dissipation area of the pump body 10 is effectively reduced, so that the heating energy is concentrated on the air in the inner cavity of the pump body 10, thereby avoiding the interference of the external environment temperature on the internal thermal balance of the pump body 10.

[0087] Referring to Figure 3 In one embodiment, the heating device 20 is arranged in the inner cavity of the base 11, and the temperature collection device 30 is embedded in the base 11, with two collection ends of the temperature collection device 30 being respectively in the inner cavity of the base 11 and exposed to the outside of the pump body 10.

[0088] The arrangement of the heating device 20 in the inner cavity of the base 11 means that the heating device 20 is installed in the internal cavity of the base 11. It can be implemented by using a resistance wire or a ceramic heating sheet, so that the heat is uniformly transmitted to the inside of the pump body 10 through the spatial distribution of the inner cavity of the base 11. The embedding of the temperature collection device 30 in the base 11 means that the temperature sensor is embedded in the structure of the base 11. It can be implemented by using a thermocouple or a thermistor, with two collection ends being respectively in the inner cavity of the base 11 and in the external environment, so as to synchronously acquire the temperature data inside and outside the pump body 10.

[0089] The heating device 20 is integrated in the inner cavity of the base 11, and heat is transferred to the inside of the pump body 10 through the heat conduction characteristics of the structure of the base 11, avoiding the influence of the external environment on the heating efficiency. The inner cavity collection end of the temperature collection device 30 directly contacts the air in the inner cavity of the base 11, and the exposed collection end is exposed to the outside of the pump body 10, and by comparing the inner and outer temperature data in real time, accurate temperature difference information is provided for the control device 40. When the temperature outside the pump is lower than the threshold value, the control device 40 dynamically adjusts the power of the heating device 20 based on the temperature difference between the inside and outside, so that the temperature in the inner cavity of the base 11 quickly reaches the preset threshold value, thereby ensuring that the lubricating grease inside the pump body 10 maintains fluidity in a low-temperature environment. Thus, the heating device 20 is integrated in the inner cavity of the base 11, shortening the heat conduction distance, and at the same time, the synchronous monitoring of the inner and outer temperatures is realized through the embedded temperature collection device 30, solving the problem of temperature feedback lag in the traditional scheme.

[0090] In summary, the diaphragm pump provided by the embodiments of the present application has a built-in heating device and a double-channel temperature detection temperature collection device, the controller obtains the pump internal temperature and the pump external temperature collected by the temperature collection device, and the heating device is started to heat when the pump external temperature is lower than the first threshold temperature before the pump body is started, until the pump internal temperature is higher than the second threshold temperature, the pump body is started, and active temperature control preparation before the pump body is started is realized. Since active temperature control preparation is performed before the pump body is started, the problem of lubrication failure when the diaphragm pump is started in a low-temperature environment is effectively solved, the lubricating grease is restored to a flowing state through a preheating mechanism, and wear caused by dry friction of the bearing is avoided, so that normal operation of the equipment in a low-temperature environment can be ensured without manual intervention.

[0091] It should be understood that in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, "A and / or B" can mean that there are three cases of only A, only B and A and B at the same time, and A and B can be singular or plural. The character " / " generally represents that the front and rear associated objects have an "or" relationship. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0092] The preferred embodiments of the embodiments of the present application are described above with reference to the accompanying drawings, but this does not limit the scope of the rights of the embodiments of the present application. Any modifications, equivalent replacements and improvements made by those skilled in the art without departing from the scope and essence of the embodiments of the present application shall be within the scope of the rights of the embodiments of the present application.

Claims

1. A diaphragm pump, characterized in that, include: Pump body; A heating device is disposed in the inner cavity of the pump body to heat the air inside the pump body; Temperature acquisition device, used to acquire the external temperature and internal temperature of the pump; A control device, electrically connected to the pump body, the heating device and the temperature acquisition device, is used to activate the heating device to heat before the pump body is started and when the external temperature of the pump is lower than a first threshold temperature, until the pump body is started when the internal temperature of the pump is higher than a second threshold temperature. The control device is also configured to configure the heating power of the heating device according to the pump internal temperature, the pump external temperature, the target temperature and the preset heating time, so that the heating device heats at the first target power within the preset heating time; The configuration of the heating power of the heating device based on the pump internal temperature, the pump external temperature, the target temperature, and the preset heating duration includes: The internal energy increment of the pump body is determined based on the pump internal temperature and the target temperature; The heat dissipation energy of the pump body is determined based on the pump internal temperature and the pump external temperature; The first target power is determined based on the preset heating time, the internal energy increment of the pump body, and the heat dissipation energy of the pump body.

2. The diaphragm pump according to claim 1, characterized in that, The formula for calculating the internal energy increment of the pump body is: ， in, This represents the increase in the internal energy of the pump body. The density of the air inside the pump body. This refers to the volume of the pump's internal cavity. This refers to the specific heat capacity of the air inside the pump. For the target temperature, This is the initial pump internal temperature; The formula for calculating the heat dissipation energy of the pump body is: ， in, For the heat dissipation energy of the pump body, The convective heat transfer coefficient is... The outer surface area of ​​the pump body. For the first The pump internal temperature at a given moment. , To preset the heating time, This refers to the external temperature of the pump. The formula for calculating the first target power is: ， in, The first target power.

3. The diaphragm pump according to claim 1, characterized in that, After the pump body is started, the control device is also used to configure the heating power of the heating device according to the temperature change trend inside the pump, so that the heating device heats with a heating power that matches the temperature change trend of the pump body.

4. The diaphragm pump according to claim 3, characterized in that, The step of configuring the heating power of the heating device based on the temperature change trend inside the pump includes: Determine the actual temperature offset value relative to the target temperature offset value; the target temperature offset value is the difference between the target temperature and the second threshold temperature. When the pump internal temperature is lower than the second threshold temperature or higher than the target temperature, the actual temperature offset value is the difference between the target temperature and the pump internal temperature. When the pump internal temperature is not lower than the second threshold temperature and not higher than the target temperature, the actual temperature offset value is the difference between the pump internal temperature and the second threshold temperature. The heating power of the heating device is compensated in multiple stages based on the temperature offset to obtain a second target power, and the heating device is then heated at the second target power.

5. The diaphragm pump according to claim 4, characterized in that, The formula for calculating the second target power is: ， ， ， in, For the second target power, For the i-th compensation power, , This is the temperature offset. For reference power, These are the weighting coefficients. .

6. The diaphragm pump according to any one of claims 1 to 5, characterized in that, The pump body includes a base, a pump head, and a motor: The base supports the pump head; The pump head is fixed to the top side of the base and is provided with a transmission mechanism extending into the inner cavity of the base; The motor is connected to the transmission mechanism, and the transmission mechanism drives the pump head.

7. The diaphragm pump according to claim 6, characterized in that, The diaphragm pump also includes a heat insulation body, which covers the outside of the pump body.

8. The diaphragm pump according to claim 6, characterized in that, The heating device is disposed in the inner cavity of the base, the temperature acquisition device is embedded in the base, and the two acquisition ends of the temperature acquisition device are respectively located in the inner cavity of the base and exposed outside the pump body.

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