CN113828574B - System and method for maintaining solvent oil in turbulent flow state for part flushing - Google Patents
System and method for maintaining solvent oil in turbulent flow state for part flushing Download PDFInfo
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- CN113828574B CN113828574B CN202111114714.1A CN202111114714A CN113828574B CN 113828574 B CN113828574 B CN 113828574B CN 202111114714 A CN202111114714 A CN 202111114714A CN 113828574 B CN113828574 B CN 113828574B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
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Abstract
The invention provides a system and a method for keeping solvent oil in a turbulent flow state to flush parts, wherein the system comprises an operation platform, a heat exchange subsystem, a temperature control subsystem, a solvent oil circulation subsystem, a water circulation subsystem and a controller, wherein the heat exchange subsystem at least comprises a water/oil heat exchanger, the solvent oil circulation subsystem comprises an oil tank, an inner circulation loop and at least one outer circulation loop, the water circulation subsystem comprises a water tank, a heater, a water pump group, a water circulation output pipe and a water circulation return pipe, water with required temperature in the water circulation subsystem transfers heat to the solvent oil in the inner circulation loop through the water/oil heat exchanger to keep the solvent oil in a specific temperature range, and the outer circulation loop outputs the solvent oil and forms turbulent flow. The invention adopts the solvent oil in a turbulent flow state for washing, and has the advantages of high washing efficiency and good washing effect.
Description
Technical Field
The invention belongs to the technical field of part flushing, and particularly relates to a system for flushing parts by keeping solvent oil in a turbulent flow state; meanwhile, the method for flushing the parts by keeping the solvent oil in a turbulent state is also related.
Background
The redundant objects in the precision parts are the main reasons of accidents, and the parts are washed clean, so that the failure rate can be greatly reduced.
The existing flushing system mostly adopts the structure of an oil tank, a pump and an operation table, a water gun with a switch is arranged on the operation table, the water gun is opened, a flushing agent (solvent oil) is pumped out at a certain flow speed and flushes a workpiece, and the flushing agent which flushes the workpiece returns to a flushing agent tank through a recovery pipeline.
This prior art exists that the washing effect is unsatisfactory, receive external factor to influence big defect, can't realize the required washing quality of high-precision parts, consequently needs to improve and wash the quality.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a system and a method for keeping the solvent oil in a turbulent flow state to flush parts, wherein the solvent oil in the turbulent flow state is adopted to flush, and the system and the method have the advantages of high flushing efficiency and good flushing effect.
It is a first object of the present invention to provide a system for maintaining a solvent oil in a turbulent flow for parts flushing, comprising:
the operation table is used for providing an operation space for part washing;
a heat exchange subsystem including at least a water/oil heat exchanger;
a temperature control subsystem including at least a first temperature detector;
a solvent oil circulation subsystem;
a water circulation subsystem;
and, a controller;
wherein the solvent oil circulation subsystem comprises an oil tank, an inner circulation loop and at least one outer circulation loop;
the internal circulation loop is provided with an internal circulation output pipe, an oil delivery pump set and an internal circulation backflow pipe, one end of the internal circulation output pipe is positioned in the oil tank, the other end of the internal circulation output pipe is connected with an oil inlet of the water/oil heat exchanger, the oil delivery pump set is arranged on the internal circulation output pipe, one end of the internal circulation backflow pipe is connected with an oil outlet of the water/oil heat exchanger, and the other end of the internal circulation backflow pipe is positioned in the oil tank;
the external circulation loop is provided with an external circulation output pipe, a diaphragm pump and an external circulation return pipe, one end of the external circulation output pipe is positioned in the oil tank, the other end of the external circulation output pipe is connected to the operation console, the diaphragm pump is arranged on the external circulation output pipe, one end of the external circulation return pipe is connected with the operation console, and the other end of the external circulation return pipe is positioned in the oil tank;
the water circulation subsystem comprises a water tank, a heater, a water pump set, a water circulation output pipe and a water circulation return pipe, the heater is arranged in the water tank and used for heating water in the water tank, one end of the water circulation output pipe is positioned in the water tank, the other end of the water circulation output pipe is connected with a water inlet of the water/oil heat exchanger, the water pump set is arranged on the water circulation output pipe, one end of the water circulation return pipe is connected with a water outlet of the water/oil heat exchanger, and the other end of the water circulation return pipe is positioned in the water tank;
the first temperature detector is used for detecting the temperature of the solvent oil in the oil tank, and the controller comprehensively controls the opening and closing of at least one of the diaphragm pump, the oil delivery pump set, the water pump set and the heater or adjusts the power value of the at least one of the diaphragm pump, the oil delivery pump set, the water pump set and the heater according to the real-time temperature value detected by the first temperature detector, so that the solvent oil output by the outer circulation output pipe is in a turbulent flow state when the diaphragm pump is controlled to be opened.
In the above technical solution of the present invention, the solvent oil circulation subsystem preferably includes at least a multistage filter.
As another specific embodiment of the invention, when the diaphragm pump is controlled to be started, the temperature of the solvent oil in the oil tank is between 30 and 40 ℃.
As another specific embodiment of the present invention, the internal circulation loop further comprises a reversing valve, an air/oil cooler and a cooling return pipe, the reversing valve has an inlet and two outlets, the inlet of the reversing valve is connected to the internal circulation output pipe, one of the outlets of the reversing valve is connected to the oil inlet of the water/oil heat exchanger, the other outlet of the reversing valve is connected to one end of the cooling return pipe, the air/oil cooler is disposed on the cooling return pipe, and the other end of the cooling return pipe is located in the oil tank.
In another embodiment of the present invention, the inner circulation output pipe is provided with a first filter at the downstream of the oil delivery pump set, the outer circulation output pipe is provided with a second filter at the upstream of the diaphragm pump set, and the water circulation output pipe is provided with a third filter at the downstream of the water pump set.
As another specific embodiment of the present invention, the temperature control subsystem further comprises a second temperature detector and a third temperature detector;
the second temperature detector is used for detecting the temperature of the solvent oil after heat exchange of the water/oil heat exchanger;
wherein the third temperature detector is used for detecting the temperature of the water in the water tank;
wherein the outer circulation output pipe and the inner circulation return pipe are positioned at two opposite sides of the oil tank, the first temperature detector is arranged in the area of the oil tank close to the outer circulation output pipe, and the second temperature detector is arranged in the area of the oil tank close to the inner circulation return pipe;
and the controller controls the diaphragm pump to be started according to the real-time temperature value detected by the first temperature detector, and comprehensively controls the starting and stopping of at least one of the diaphragm pump, the oil delivery pump set, the water pump set and the heater or adjusts the power value of the diaphragm pump, the oil delivery pump set, the water pump set and the heater by combining the real-time temperature values of the second temperature detector and the third temperature detector.
In another embodiment of the present invention, an oil tank level relay is disposed in the oil tank, and the controller comprehensively adjusts or turns off the power value of at least one of the diaphragm pump, the oil delivery pump set, the water pump set, and the heater according to the real-time total amount of solvent oil in the oil tank detected by the oil tank level relay.
A second object of the present invention is to provide a method for flushing parts while maintaining the solvent oil in a turbulent flow state, which employs the above-mentioned system for maintaining the solvent oil in a turbulent flow state, the method comprising the steps of:
step one, presetting a lower temperature limit value and an upper temperature limit value of solvent oil required to be kept in a turbulent flow state;
step two, turning on a heater, and keeping the water temperature in the water tank to be greater than the upper limit value of the temperature;
step three, detecting the temperature value of the solvent oil in the current oil tank through the first temperature detector and respectively executing the following steps:
1) when the temperature value detected by the first temperature detector is smaller than the lower temperature limit value, the controller controls to start the water pump set and the oil delivery pump set, and the solvent oil in the internal circulation loop is heated in a non-contact manner through the water/oil heat exchanger until the temperature of the solvent oil in the oil tank is increased to or above the lower temperature limit value;
2) when the temperature value detected by the first temperature detector is greater than the lower temperature limit value and does not exceed the upper temperature limit value,
2.1) the controller keeps the opening of the water pump set and the oil delivery pump set, and carries out non-contact heating on the solvent oil in the internal circulation loop through the water/oil heat exchanger to continuously heat the solvent oil in the oil tank; and
2.2) the controller controls to start the diaphragm pump, and the solvent oil with the temperature value exceeding the lower temperature limit value is output to the operation table for washing the parts;
3) when the temperature value detected by the first temperature detector is larger than the upper temperature limit value, the controller adjusts the power of the heater and keeps the water temperature in the water tank at the upper temperature limit value,
3.1) the controller controls the oil delivery pump set to be closed until the temperature detected by the first temperature detector is lower than the upper temperature limit value, and then the oil delivery pump set is started to keep the temperature of the solvent oil in the oil tank to tend to be stable; and
and 3.2) the controller controls the diaphragm pump to be closed to stop outputting the solvent oil until the temperature detected by the first temperature detector is less than the upper temperature limit value, and then the diaphragm pump is started.
As another specific embodiment of the invention, the water temperature in the water tank in the second step does not exceed the flash point temperature of the solvent oil.
As another specific embodiment of the present invention, in the third step, when the temperature value detected by the first temperature detector is greater than the lower temperature limit and does not exceed the upper temperature limit, the controller adjusts the power of the heater to keep the temperature of the water in the water tank at 7 ℃ above the upper temperature limit, so as to continuously raise the temperature of the solvent oil in the oil tank.
As another specific embodiment of the invention, the method further comprises a fourth step of compensating and correcting the temperature loss caused by the external circulation output pipe in the conveying process;
and detecting the temperature of the solvent oil directly output from the operating platform through a fourth temperature detector, performing difference calculation and calculating the temperature loss, performing difference calculation on the temperature value detected by the first temperature detector and the temperature loss to obtain the corrected temperature of the first temperature detector, and taking the corrected temperature as the temperature value of the solvent oil in the current oil tank detected by the first temperature detector in the third step.
The invention has the following beneficial effects:
the invention heats and controls the temperature of the solvent oil, so that the solvent oil is output in a turbulent flow state to wash the parts, the movement of liquid particles of the solvent oil in the turbulent flow state is disordered, and the violent transverse movement exists besides the movement parallel to the axis of the pipeline, so that the movement can better wash the surfaces of the parts, and the washing quality is improved.
Meanwhile, the method provided by the invention keeps the flushing temperature of the solvent oil to be balanced through the cooperative control of all parameters, has strong controllability, and forms a more efficient and energy-saving flushing scheme through the analysis of all parameters.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of laminar and turbulent flow;
FIG. 2 is a control schematic of the system of the present invention;
FIG. 3 is a schematic diagram of the physical properties of the solvent oil Isopar L;
FIG. 4 is a graph of viscosity versus temperature for example 2;
FIG. 5 is a graph of Reynolds number versus temperature for example 2;
FIG. 6 is a schematic flow diagram of the method of the present invention;
FIG. 7 is a schematic comparison of maximum contaminant size before and after use of the process of the present invention;
FIG. 8 is a graphical comparison of maximum contaminant size statistics before and after use of the method of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
The flowing state of the liquid in the pipeline is not only related to the average velocity of the flow velocity in the pipeline, but also related to the pipe diameter and the kinematic viscosity of the liquid, the flowing state of the liquid can be judged by a dimensionless number composed of the parameters, namely a Reynolds number Re, generally, the Reynolds number Re <2300 is a laminar flow state, Re ═ 2300-4000 is a transition state, and Re >4000 is a turbulent flow state.
As shown in fig. 1, laminar flow refers to: the liquid particles do not interfere with each other and the flow of the liquid is linear or laminar and parallel to the pipe axis, as shown schematically in fig. 1a) for laminar flow;
as the reynolds number increases, a transient state is assumed, as shown in fig. 1b) which shows a schematic diagram in which laminar flow starts to break, and in fig. 1c) which shows a schematic diagram in which liquid starts to fluctuate up and down and breaks, and the flow tends to be turbulent;
turbulent flow means that: the motion of the liquid particles is chaotic and apart from the motion parallel to the axis of the pipe there is also this violent lateral motion, as shown schematically in fig. 1d) for turbulent flow.
Based on this, the present patent proposes a system and method for maintaining the miscella in a turbulent state for parts flushing, and is specifically developed as follows.
Example 1
The embodiment provides a system for keeping solvent oil in a turbulent flow state for part washing, which comprises an operation platform 1, a heat exchange subsystem, a temperature control subsystem, a solvent oil circulation subsystem, a water circulation subsystem and a controller, wherein the controllers are connected among the subsystems for performing cooperative control.
The operation table 1 provides an operation space for part washing, for example, the part to be washed is washed by arranging a washing gun head on the operation table 1.
The heat exchange subsystem is used for carrying out heat exchange, namely heat of water in water circulation is uniformly and stably transferred to the solvent oil circulation subsystem, and further temperature regulation and control of the solvent oil are achieved, wherein the heat exchange subsystem at least comprises a water/oil heat exchanger 2, and specifically, the water/oil heat exchanger 2 is of a tube type structure.
The temperature control subsystem is used for temperature detection of the respective zone positions and comprises a first temperature detector 3, a second temperature detector 4 and a third temperature detector 5.
The solvent oil circulation subsystem comprises an oil tank 6, an inner circulation loop and at least one outer circulation loop, when a plurality of outer circulation loops are arranged, the outer circulation loops are connected in parallel and work independently, the embodiment is described by using a single outer circulation loop, and the outer circulation loops are correspondingly connected in parallel.
The internal circulation loop is provided with an internal circulation output pipe 7, an oil delivery pump set 8 and an internal circulation return pipe 9, one end of the internal circulation output pipe 7 is positioned in the oil tank 6, the other end of the internal circulation output pipe 7 is connected with an oil inlet of the water/oil heat exchanger 2, the oil delivery pump set 8 is arranged on the internal circulation output pipe 7, one end of the internal circulation return pipe 9 is connected with an oil outlet of the water/oil heat exchanger 2, and the other end of the internal circulation return pipe 9 is positioned in the oil tank 6;
furthermore, the internal circulation loop also comprises a reversing valve 10, an air/oil cooler 11 and a cooling return pipe 12, wherein the reversing valve 10 is preferably a two-position four-way valve which is provided with an inlet and two outlets, the inlet of the reversing valve 10 is connected with the internal circulation output pipe 7, one outlet of the reversing valve 10 is connected with an oil inlet of the water/oil heat exchanger 2, the other outlet of the reversing valve 10 is connected with one end of the cooling return pipe 12, the air/oil cooler 11 is arranged on the cooling return pipe 12, and the other end of the cooling return pipe 12 is positioned in the oil tank 6.
Carry out cooling treatment through setting up solvent oil in the internal circulation circuit of wind/oil cooler 11, at the control by temperature change in-process, because of being difficult to realize comprehensive homogeneity in the short time in the oil tank 6 solvent oil temperature, in case the solvent oil temperature is higher than required temperature value, then can carry out cooling treatment through wind/oil cooler 11, the existence of wind/oil cooler 11 makes the temperature of solvent oil can not exceed its flash point temperature, can keep its validity of using.
The outer circulation loop is provided with an outer circulation output pipe 13, a diaphragm pump 14 and an outer circulation return pipe, one end of the outer circulation output pipe 13 is positioned in the oil tank 6, the other end of the outer circulation output pipe 13 is connected to the operating platform 1, the diaphragm pump 14 is arranged on the outer circulation output pipe 13, one end of the outer circulation return pipe is connected with the operating platform 1, and the other end of the outer circulation return pipe is positioned in the oil tank 6.
The water circulation subsystem comprises a water tank 15, a heater 16, a water pump set 17, a water circulation output pipe 18 and a water circulation return pipe 19, the heater 16 is arranged in the water tank 15 and used for heating water in the water tank 15, one end of the water circulation output pipe 18 is positioned in the water tank 15, the other end of the water circulation output pipe 18 is connected with a water inlet of the water/oil heat exchanger 2, the water pump set 17 is arranged on the water circulation output pipe 18, one end of the water circulation return pipe 19 is connected with a water outlet of the water/oil heat exchanger 2, and the other end of the water circulation return pipe 19 is positioned in the water tank 15;
the first temperature detector 3 is used for detecting the temperature of the solvent oil in the oil tank 6, and the controller comprehensively controls the opening and closing of at least one of the diaphragm pump 14, the oil delivery pump group 8, the water pump group 17 and the heater 16 or adjusts the power value of the at least one of the diaphragm pump, the oil delivery pump group 8, the water pump group 17 and the heater 16 according to the real-time temperature value detected by the first temperature detector 3, so that the solvent oil output by the outer circulation output pipe 13 is in a turbulent flow state when the diaphragm pump 14 is controlled to be opened.
Be equipped with filtering component respectively on each output tube in this embodiment to filter solvent naphtha and water, specifically do: a first filter 20 is arranged on the inner circulation outlet pipe 7 downstream of the oil delivery pump unit 8, a second filter (not shown) is arranged on the outer circulation outlet pipe 13 upstream of the diaphragm pump 14, and a third filter 21 is arranged on the water circulation outlet pipe 18 downstream of the water pump unit 17.
In this embodiment, the first temperature detector 3 is configured to detect the temperature of the solvent oil in the oil tank 6, the second temperature detector 4 is configured to detect the temperature of the solvent oil after heat exchange by the water/oil heat exchanger 2, the third temperature detector 5 is configured to detect the temperature of the water in the water tank 15, the preferred outer circulation output pipe 13 and the inner circulation return pipe 9 are located on two opposite sides of the oil tank 6, the first temperature detector 3 is disposed in a region of the oil tank 6 near the outer circulation output pipe 13, and the second temperature detector 4 is disposed in a region of the oil tank 6 near the inner circulation return pipe 9, so as to more accurately detect the temperature of the solvent oil in different position regions.
Preferably, the number of the second temperature detectors 4 may be multiple, for example, there are two second temperature detectors 4, one of the second temperature detectors 4 performs real-time detection, and the other second temperature detector 4 performs monitoring to prevent the one second temperature detector 4 from malfunctioning, so that the safety is high.
In this embodiment, the controller controls to start the diaphragm pump 14 according to the real-time temperature value detected by the first temperature detector 3, and simultaneously, in combination with the real-time temperature values of the second temperature detector 4 and the third temperature detector 5, comprehensively controls the on/off or adjusts the power value of at least one of the diaphragm pump 14, the oil delivery pump group 8, the water pump group 17 and the heater 16, so that when the diaphragm pump 14 is controlled to be started, the solvent oil output by the outer circulation output pipe 13 is in a turbulent flow state.
Specifically, the integrated control of the controller can correspondingly adjust the control precision and the adjustment range of the controller according to the requirements of different designers, and the controller is not limited in the embodiment and can directly perform on-off control without adjusting the power value under individual conditions.
The temperature of the human body feeling comfort is generally below 40 ℃, and in order to keep the human body feeling comfort during washing, the temperature of the solvent oil in the oil tank 6 is preferably controlled to be between 30 and 40 ℃ when the diaphragm pump 14 is controlled to be opened.
In this embodiment, an oil tank liquid level relay 22 is provided in the oil tank 6, the controller comprehensively adjusts or turns off the power value of at least one of the diaphragm pump 14, the oil delivery pump group 8, the water pump group 17 and the heater 16 according to the real-time solvent oil total amount in the oil tank 6 detected by the oil tank liquid level relay 22, and the specific adjustment range can be adjusted according to the requirements of different designers.
Correspondingly, a tank level relay 23 is also arranged in the water tank 15 to obtain the level of the water in the water tank 15 in real time.
Example 2
The embodiment provides a method for maintaining the solvent oil in a turbulent flow state to perform part washing, which is implemented by using the system provided in embodiment 1, specifically, the solvent oil for washing selected in this embodiment is Isopar L, and each physical property of the solvent oil is as shown in fig. 3, according to the liquid viscosity-temperature characteristic equation:
vogel equation:
wherein:
thus according to T ═ 25 ℃:
t ═ 40 ℃ at:
to obtain:
a graph of viscosity versus temperature is obtained as shown in fig. 4;
further, the viscosity and Reynolds number at each temperature of the solvent oil at a flow rate of 1m/s and a tube diameter of 8mm are shown in the following table:
| temperature of | -10 |
0 |
10 |
25 |
40 |
60℃ |
| Viscosity of the solution | 3.56 | 3.02 | 2.55 | 1.99 | 1.55 | 1.11 |
| Reynolds number | 2244 | 2651 | 3131 | 4020 | 5161 | 7202 |
A plot of reynolds number versus temperature is obtained as shown in figure 5.
Consider that:
1) isopar L is a combustible, its flash point temperature: 61 ℃;
2) the body feeling comfortable temperature of the human body is about 40 ℃;
3) the temperature of a factory building of a general factory is about 40 ℃ in summer and about 0 ℃ in winter;
in order to achieve better washing effect and keep Isopar L in a required turbulent state, the working temperature of Isopar L is set to be between 30 and 40 ℃ and is approximately stabilized at 40 ℃, so that the turbulent state is met, and the economy is realized.
The method for maintaining the solvent oil in a turbulent flow state for part washing of the embodiment is shown in fig. 6, and comprises the following steps:
step one, presetting a temperature lower limit value and a temperature upper limit value which are required to keep the solvent oil in a turbulent flow state, wherein the temperature lower limit value is 30 ℃, and the temperature upper limit value is 40 ℃.
And step two, starting the heater, keeping the water temperature in the water tank to be higher than the upper limit value of the temperature, such as 60 ℃, so as to facilitate quick heat exchange, increasing the temperature of the solvent oil in the oil tank in a short time, and ensuring that the water temperature in the water tank does not exceed the flash point temperature of the solvent oil at the moment.
Step three, detecting the temperature value of the solvent oil in the current oil tank through the first temperature detector and respectively executing the following steps:
1) when the temperature value detected by the first temperature detector is less than 30 ℃, the controller controls to start the water pump set and the oil delivery pump set, and the solvent oil in the inner circulation loop is heated in a non-contact manner through the water/oil heat exchanger until the temperature of the solvent oil in the oil tank is increased to 30 ℃ or above;
2) when the temperature value detected by the first temperature detector is more than 30 ℃ and not more than 40 ℃,
2.1) the controller keeps the opening of the water pump set and the oil delivery pump set, and carries out non-contact heating on the solvent oil in the internal circulation loop through the water/oil heat exchanger to continuously heat the solvent oil in the oil tank; and
2.2) the controller controls to start the diaphragm pump, the solvent oil with the temperature value exceeding 30 ℃ is output to the operation platform to wash the parts, and the temperature of the solvent oil is rapidly increased along with the continuous heat exchange process of the water/oil heat exchanger;
preferably, at this time, the power of the heater may be adjusted by the controller, so as to keep the water temperature in the water tank to exceed the upper limit temperature value by 7 ℃, that is, to control the water temperature to be about 47 ℃, so that the temperature of the solvent oil in the oil tank is continuously and slowly increased, and the temperature of the solvent oil does not exceed the upper limit temperature value.
3) When the temperature value detected by the first temperature detector is more than 40 ℃, the controller adjusts the power of the heater and keeps the water temperature in the water tank at 40 ℃, at the moment,
3.1) the controller controls the oil delivery pump set to be closed until the temperature detected by the first temperature detector is lower than 40 ℃, and then the oil delivery pump set is started to keep the temperature of the solvent oil in the oil tank to tend to be stabilized at 40 ℃; and
3.2) the controller controls the diaphragm pump to close to stop outputting the solvent oil until the temperature detected by the first temperature detector is less than 40 ℃ and then starts the diaphragm pump.
Further, when the temperature value detected by the first temperature detector is greater than 40 ℃, the solvent oil may be cooled by using the air/oil cooler as required to ensure that the temperature of the solvent oil is not higher than the flash point temperature, and at this time, heat exchange is not performed any more, specifically, as described in embodiment 1, switching of different paths is performed by using a switching valve to connect the air/oil cooler, which is not described herein.
Step four, compensating and correcting the temperature loss caused by the external circulation output pipe in the conveying process;
the temperature of the solvent oil directly output from the operating platform is detected by the fourth temperature detector, the difference value calculation is carried out, the temperature loss amount is obtained, the difference value calculation is carried out on the temperature value and the temperature loss amount detected by the first temperature detector, the corrected temperature of the first temperature detector is obtained, and the corrected temperature is used as the temperature value of the solvent oil in the current oil tank detected by the first temperature detector in the third step, so that the temperature loss caused by the solvent oil in the conveying process of the outer circulation output pipe is eliminated.
In this embodiment, the maximum pollutant size is used as the data reflection of the washing effect, as shown in fig. 7, the left image is the maximum pollutant image before the implementation of the present invention, the horizontal and vertical maximum sizes of the maximum pollutant image are 795um and 500.6um, respectively, the right image is the maximum pollutant image after the implementation of the present invention, the horizontal and vertical maximum sizes of the maximum pollutant image are 382.5um and 239um, respectively, and the comparison shows that the method can significantly improve the washing effect.
Fig. 8 shows a comparison of the average data for the maximum contaminant size in recent years, wherein the method (2021Q1) was performed at the end of the first quarter of 2021, before which the average for the maximum contaminant size was around 600um, and after which the average for the hitherto large contaminant size was around 350um, and the rinsing effect was significantly improved after the method was performed.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that changes may be made without departing from the scope of the invention, and it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Claims (10)
1. A system for maintaining a solvent oil in a turbulent flow for parts flushing, comprising:
the operation table is used for providing an operation space for part washing;
a heat exchange subsystem including at least a water/oil heat exchanger;
a temperature control subsystem including at least a first temperature detector;
a solvent oil circulation subsystem;
a water circulation subsystem;
and, a controller;
wherein the solvent oil circulation subsystem comprises an oil tank, an inner circulation loop and at least one outer circulation loop;
the internal circulation loop is provided with an internal circulation output pipe, an oil delivery pump set and an internal circulation return pipe, one end of the internal circulation output pipe is positioned in the oil tank, the other end of the internal circulation output pipe is connected with an oil inlet of the water/oil heat exchanger, the oil delivery pump set is arranged on the internal circulation output pipe, one end of the internal circulation return pipe is connected with an oil outlet of the water/oil heat exchanger, and the other end of the internal circulation return pipe is positioned in the oil tank;
the external circulation loop is provided with an external circulation output pipe, a diaphragm pump and an external circulation return pipe, one end of the external circulation output pipe is positioned in the oil tank, the other end of the external circulation output pipe is connected to the operating platform, the diaphragm pump is arranged on the external circulation output pipe, one end of the external circulation return pipe is connected with the operating platform, and the other end of the external circulation return pipe is positioned in the oil tank;
the water circulation subsystem comprises a water tank, a heater, a water pump set, a water circulation output pipe and a water circulation return pipe, the heater is arranged in the water tank and used for heating water in the water tank, one end of the water circulation output pipe is positioned in the water tank, the other end of the water circulation output pipe is connected with a water inlet of the water/oil heat exchanger, the water pump set is arranged on the water circulation output pipe, one end of the water circulation return pipe is connected with a water outlet of the water/oil heat exchanger, and the other end of the water circulation return pipe is positioned in the water tank;
the first temperature detector is used for detecting the temperature of the solvent oil in the oil tank, and the controller comprehensively controls the opening and closing of at least one of the diaphragm pump, the oil delivery pump set, the water pump set and the heater or adjusts the power value of the at least one of the diaphragm pump, the oil delivery pump set, the water pump set and the heater according to the real-time temperature value detected by the first temperature detector, so that the solvent oil output by the outer circulation output pipe is in a turbulent flow state when the diaphragm pump is controlled to be opened.
2. A system for maintaining a solvent oil in a turbulent flow regime for parts flushing as claimed in claim 1 wherein the temperature of the solvent oil in said tank is controlled to be between 30 ℃ and 40 ℃ when said diaphragm pump is activated.
3. The system for maintaining solvent oil in a turbulent flow state for parts washing according to claim 1, wherein the internal circulation loop further comprises a direction valve, an air/oil cooler and a cooling return pipe, the direction valve has an inlet and two outlets, the inlet of the direction valve is connected to the internal circulation output pipe, one of the outlets of the direction valve is connected to the oil inlet of the water/oil heat exchanger, the other outlet of the direction valve is connected to one end of the cooling return pipe, the air/oil cooler is disposed on the cooling return pipe, and the other end of the cooling return pipe is located in the oil tank.
4. The system for maintaining solvent oil in a turbulent flow regime for parts flushing as claimed in claim 1, wherein the inner circulation outlet conduit is provided with a first filter downstream of the oil transfer pump set, the outer circulation outlet conduit is provided with a second filter upstream of the diaphragm pump set, and the water circulation outlet conduit is provided with a third filter downstream of the water pump set.
5. A system for maintaining a solvent oil in a turbulent flow regime for parts flushing as recited in claim 1, wherein the temperature control subsystem further comprises a second temperature sensor and a third temperature sensor;
the second temperature detector is used for detecting the temperature of the solvent oil after heat exchange of the water/oil heat exchanger;
wherein the third temperature detector is used for detecting the temperature of the water in the water tank;
the first temperature detector is arranged in the area of the oil tank close to the outer circulation output pipe, and the second temperature detector is arranged in the area of the oil tank close to the inner circulation return pipe;
the controller controls the diaphragm pump to be started according to the real-time temperature value detected by the first temperature detector, and simultaneously comprehensively controls the on-off of at least one of the diaphragm pump, the oil delivery pump set, the water pump set and the heater or adjusts the power value of the diaphragm pump, the oil delivery pump set, the water pump set and the heater by combining the real-time temperature values of the second temperature detector and the third temperature detector.
6. The system for maintaining solvent oil in a turbulent flow state for parts washing according to claim 1, wherein a tank level relay is disposed in the tank, and the controller comprehensively adjusts the power value or turns off at least one of the diaphragm pump, the oil delivery pump set, the water pump set and the heater according to the real-time total amount of solvent oil in the tank detected by the tank level relay.
7. A method for maintaining a solvent oil in a turbulent flow state for parts washing, using the system for maintaining a solvent oil in a turbulent flow state for parts washing of any one of claims 1 to 6, the method comprising the steps of:
step one, presetting a lower temperature limit value and an upper temperature limit value of solvent oil required to be kept in a turbulent flow state;
step two, turning on a heater, and keeping the water temperature in the water tank to be greater than the upper limit value of the temperature;
step three, detecting the temperature value of the solvent oil in the current oil tank through the first temperature detector and respectively executing the following steps:
1) when the temperature value detected by the first temperature detector is smaller than the lower temperature limit value, the controller controls to start the water pump set and the oil delivery pump set, and the solvent oil in the internal circulation loop is heated in a non-contact manner through the water/oil heat exchanger until the temperature of the solvent oil in the oil tank is increased to or above the lower temperature limit value;
2) when the temperature value detected by the first temperature detector is greater than the lower temperature limit value and does not exceed the upper temperature limit value,
2.1) the controller keeps the opening of the water pump set and the oil delivery pump set, and carries out non-contact heating on the solvent oil in the internal circulation loop through the water/oil heat exchanger to continuously heat the solvent oil in the oil tank; and
2.2) the controller controls to start the diaphragm pump, and the solvent oil with the temperature value exceeding the lower temperature limit value is output to the operation table for washing the parts;
3) when the temperature value detected by the first temperature detector is larger than the upper temperature limit value, the controller adjusts the power of the heater and keeps the water temperature in the water tank at the upper temperature limit value,
3.1) the controller controls the oil delivery pump set to be closed until the temperature detected by the first temperature detector is lower than the upper temperature limit value, and then the oil delivery pump set is started to keep the temperature of the solvent oil in the oil tank to tend to be stable; and
and 3.2) the controller controls the diaphragm pump to be closed to stop outputting the solvent oil until the temperature detected by the first temperature detector is less than the upper temperature limit value, and then the diaphragm pump is started.
8. The method for maintaining a turbulent flow of mineral spirits for flushing parts as claimed in claim 7 wherein in step two the water in the reservoir is maintained at a temperature not exceeding the flash point temperature of the mineral spirits.
9. The method as claimed in claim 8, wherein when the temperature detected by the first temperature detector is higher than the lower temperature limit value and not higher than the upper temperature limit value, the controller adjusts the power of the heater to maintain the temperature of the water in the water tank at 7 ℃ higher than the upper temperature limit value, so as to continuously raise the temperature of the solvent oil in the oil tank.
10. The method of maintaining a turbulent flow of mineral spirits for flushing a part as claimed in claim 7, further comprising:
step four, compensating and correcting the temperature loss caused by the external circulation output pipe in the conveying process;
and detecting the temperature of the solvent oil directly output from the operating platform through a fourth temperature detector, performing difference calculation and calculating the temperature loss, performing difference calculation on the temperature value detected by the first temperature detector and the temperature loss to obtain the corrected temperature of the first temperature detector, and taking the corrected temperature as the temperature value of the solvent oil in the current oil tank detected by the first temperature detector in the third step.
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| CN202111114714.1A CN113828574B (en) | 2021-09-23 | 2021-09-23 | System and method for maintaining solvent oil in turbulent flow state for part flushing |
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