Device and method for detecting flow resistance of cooling liquid filter element of filter

Abstract

The device comprises a detection shell, a signal cover, an upper box body and a lower box body, a bearing circular truncated cone is arranged on the lower portion of the detection shell, the lower end of the upper box body is fixedly connected with the bearing circular truncated cone through a flange, and the upper end of the lower box body is in threaded connection with the bearing circular truncated cone; an inner boss is arranged in the detection shell and divides the detection shell into a magnetic cavity and a valve cavity, the piston is arranged in the valve cavity in the lower portion of the detection shell, the upper end of the piston is inserted into the inner boss, magnetic steel is arranged on the upper portion of the piston, and the signal cover is located in the magnetic cavity in the upper portion of the detection shell and makes sliding contact with the inner boss. A magnetic ring is arranged on the signal cover, and a microswitch is arranged at the upper end of the detection shell; the device is ingeniously combined with the filter, the traditional plug-in mounting mode of the annunciator is thoroughly changed, the linkage work with the filter element is realized, and the safe and reliable work of the filter is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of filter flow resistance detection, and in particular to a device and method for detecting the flow resistance of a filter coolant element. Background Art

[0002] Nowadays, the confirmation of the maintenance timing of filter products generally adopts the method of regular maintenance, and the filter element is replaced regularly, such as in the cooling system of aircraft or some important equipment. However, this method of regular replacement of filter elements is unscientific and is likely to cause two results. One is that the flow resistance is already high and the pressure loss is large, but it is not time for regular maintenance, resulting in reduced cooling system performance; the other is that the product can still be used within the required range, but it is replaced regularly, resulting in performance waste and cost waste; therefore, in this case, there is a need for a device that can detect the pressure difference before and after the filter element. The current method is to directly install a pressure differential signal device on the filter or the front and back of the filter element. The installation method is a plug-in type or a duct connection installation method. The pressure differential signal device is designed separately from the filter. When the flow of the detection core reaches When the requirement is reached, an alarm signal is issued. For example, patent announcement number CN207485778U is a split voltage difference signal device structure. The voltage difference signal device includes an upper shell, an electrode, an upper magnetic element, an upper spring, a lower magnetic element, a lower spring, a high-pressure chamber pressure sensing port, a wire, a low-pressure chamber pressure sensing port, a guide sleeve, and a piston. The split voltage difference signal device is a plug-in structure; the defect is that it is only a separate signal device with a single function and cannot be integrated with the filter. It can only detect whether the pressure difference meets the standard. It lacks linkage with the filter element filtration system. If the filter element cannot be replaced in time, the reliable operation of the system cannot be guaranteed. This signal device is a common structure on the market; similarly, patent announcement numbers CN209434041U, CN211133218U, CN 210050129U, CN212779713U, CN206785491U and CN210603699U also have the above-mentioned problems. They are all external installation structures, and pressure difference detection is achieved by connecting the high-pressure chamber and the low-pressure chamber respectively.

[0003] Chinese patent application No. 202111310305.9 discloses an integrated small pressure difference signal device with early warning bypass; it includes a signal device component, a pressure difference component and a shell. The magnetic force between the active magnet and the driven magnet of the present invention is perpendicular to the axial direction of the valve core, which effectively reduces the external force borne by the valve core. It adopts an integrated design. While realizing the alarm function, the bypass function is realized without adding components. Although the pressure difference signal device adopts integration and only concentrates the bypass valve inside the oil filter on the signal device, it still adopts a plug-in structure and is separated from the filter. It occupies the equipment installation space and cannot be linked with the filter filtration system. When the aircraft cannot replace the filter element in time, the safe and reliable operation of the system cannot be guaranteed; it cannot meet the needs of actual use, so there is an urgent need for improved technologies on the market to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a device and method for detecting the flow resistance of a filter coolant element. The device is cleverly combined with the filter, completely changes the traditional plug-in installation method of the signal indicator, and realizes linkage work with the filter element, ensuring the safe and reliable operation of the filter, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device and method for detecting the flow resistance of a filter coolant element, comprising a detection shell, a signal cover, an upper box body and a lower box body, a bearing truncated table is arranged at the lower part of the detection shell, the lower end of the upper box body is fixedly connected to the bearing truncated table by a flange, the upper end of the lower box body is threadedly connected to the bearing truncated table, an inner boss is arranged inside the detection shell, the inner boss divides the detection shell into a magnetic chamber and a valve chamber, a piston is arranged in the valve chamber at the lower part of the detection shell, the upper end of the piston is inserted into the inner boss, a magnetic steel is arranged on the upper part of the piston, the signal cover is located in the magnetic chamber at the upper part of the detection shell, and the signal cover is located in the magnetic chamber at the upper part of the detection shell, and the signal cover is located in the magnetic chamber at the upper part of the detection shell. The signal cover is in sliding contact with the inner boss, a magnetic ring is arranged on the signal cover, a micro switch is arranged on the upper end of the detection shell, a pressure head cooperating with the micro switch is arranged on the signal cover, an annular chamber is arranged between the inner boss and the piston, a secondary filter chamber is arranged in the outer circumferential direction of the detection shell, the secondary filter chamber is connected with the annular chamber through a pressure stabilizing channel, a drainage pipe is arranged in the circumferential direction of the lower part of the detection shell, the drainage pipe passes through the bearing truncated table to the lower box body, an arc chamber and an annular chamber are arranged on the upper surface of the bearing truncated table from the inside to the outside, a magnet is arranged at the bottom of the arc chamber, a flow gap is arranged above the magnet, the flow gap is connected with the arc chamber, and the arc chamber is connected with the lower box body.

[0006] Furthermore, the micro switch is fixed on a mounting base plate, and the mounting base plate is fixed to the upper end of the detection shell by screws. The micro switch includes micro switch 1 and micro switch 2, and the fixed position of micro switch 2 is higher than micro switch 1. The pressure head includes a movable pressure head and a fixed pressure head. The fixed pressure head is fixed on the signal cover, and the fixed pressure head corresponds to the contact of micro switch 2. The movable pressure head is slidably connected to the signal cover through a guide column, and a buffer spring is mounted on the guide column. The movable pressure head corresponds to the contact of micro switch 1, and the movable pressure head is a movable structure.

[0007] Furthermore, an outer protective cover is screwed on the upper end of the detection shell, and a signal light is arranged on the top surface of the outer protective cover. There are three signal lights, namely, a blue light, a yellow light and a red light. Micro switch one is electrically connected to the yellow light, and micro switch two is electrically connected to the red light.

[0008] Furthermore, a connecting sleeve is provided on the lower surface of the supporting truncated table, and the connecting sleeve is threadedly connected to the main filter element. An annular inner boss is provided on the inner side of the connecting sleeve, and a purification chamber is provided on the supporting truncated table. The purification chamber is connected to the inner cavity of the main filter element, and an outlet joint pipe is connected to the purification chamber. The outlet joint pipe is connected to the secondary filter chamber through a pressure-compensating pipe. A safety valve is provided on the detection shell, and the safety valve is connected to the outlet joint pipe through a pressure relief pipe.

[0009] Furthermore, at least three arc chambers are arranged, and the arc chambers are evenly distributed along the center of the detection shell. An inlet joint pipe is arranged on one side of the detection shell. The lower part of the inlet joint pipe is connected with an annular tube. The annular tube is connected with the arc chamber through a short pipe. A through hole is opened at the bottom of the side of the arc chamber, and the through hole is connected with the flow gap.

[0010] Furthermore, an inlet pipe and an outlet pipe are respectively arranged on the two side surfaces of the upper box body, the lower end of the inlet pipe is inserted into the inlet joint pipe, and the lower end of the outlet pipe is inserted into the outlet joint pipe.

[0011] Furthermore, a pressure-stabilizing filter element is provided in the secondary filter chamber, and a pressure cover is provided at the upper end of the secondary filter chamber, and the pressure cover is threadedly connected to the secondary filter chamber.

[0012] Furthermore, an annular filter screen is arranged in the annular chamber, the annular filter screen is made of a punched metal plate, and flow holes are arranged in the circumferential direction of the supporting truncated table. The annular chamber is connected with the lower box body through the flow holes.

[0013] Furthermore, a base is provided at the lower end of the detection shell, the base is screwed to the detection shell, a center hole is provided at the center of the base, a main spring is provided between the base and the piston, and an adjustment gasket is provided between the upper end of the main spring and the bottom of the piston hole.

[0014] A method for detecting flow resistance of a filter coolant element, the method for detecting a normal state, a prompt state and a warning state, comprises the following steps: S1: In normal state, the coolant in the inlet joint pipe enters the arc chamber after being circumferentially diverted by the annular pipe, and then enters the lower box through the annular chamber. The coolant is filtered by the main filter element and enters the purification chamber upward, and is discharged through the outlet joint pipe. The green light is on during normal operation; S2: Prompt state. After the main filter element has been working for a period of time, the pressure difference between the front and rear of the main filter element increases, and the pressure overcomes the elastic force of the main spring, and the piston moves downward. During this process, the magnetic steel drives the magnetic ring and the signal cover upward, and the movable pressure head contacts the contact of the micro switch 1. The micro switch 1 is turned on, and the yellow light is on. At this time, you only need to replace the main filter element; S3: Warning state. When the main filter element is not replaced in time, as the working time increases, the pressure overcomes the elastic force of the main spring to drive the piston to continue to move downward, the signal cover moves upward, the micro switch 1 is still in the on state, the fixed pressure head contacts the contact of the micro switch 2, the micro switch 2 is turned on, the yellow light and the red light are on at the same time, and the main filter element and the pressure-stabilizing filter element need to be replaced at the same time; S4: In S3, the coolant in the lower box enters the detection housing through the drainage pipe, and then enters the annular chamber upward, the unfiltered coolant enters the secondary filter chamber through the pressure stabilizing channel, and the coolant filtered by the pressure stabilizing filter element enters the outlet joint pipe through the pressure compensation pipe; S5: In the warning state, the filter element is not replaced in time. When the pressure in the detection housing is greater than the opening pressure of the safety valve, the safety valve opens, and the unfiltered coolant passes through the safety valve and the pressure relief pipe directly into the outlet joint pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The upper and lower boxes are detachable, and the bearing round table realizes the centralized installation of the detection structure and the filtering system, which makes full use of the space and reduces the volume of the filter. The device completely changes the traditional plug-in installation method of the signal device through the clever combination with the filter, and realizes the linkage work with the filter element to ensure the safe and reliable operation of the filter.

[0016] 2. It has two functions: detection prompt state and warning state. When the flow resistance of the main filter element reaches the use limit requirement, a yellow light alarm signal is issued. At this time, you only need to replace the main filter element, which can not only ensure the system performance, but also avoid the waste of performance and cost. In order to ensure the safe and reliable operation of the cooling system, a voltage-stabilizing filter element is set. In the prompt state, the filter can still meet the stable working requirements normally and meet the needs of not being able to replace the main filter element in time in special environments.

[0017] 3. The present invention has a compact structure, a brand-new structural design, and a flexible disassembly method. It can monitor the flow resistance of the filter element in real time, has high detection accuracy, and is easy to use. An arc chamber and an annular chamber are designed on the supporting truncated table to achieve preliminary filtration of the filter element. In the process of the coolant turning to the annular chamber, the flow rate of the coolant is slowed down, and at the same time, the magnetic material in the coolant is adsorbed to increase the dirt holding capacity. At the same time, it can effectively resist coolant flow fluctuations and improve the service life of the equipment.

[0018] 4. The detection shell is used as a detection carrier and cleverly integrated with the secondary filter chamber to reduce the production of parts, facilitate rapid assembly, save processing procedures, and facilitate subsequent product inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the enlarged structure of the piston of the present invention; Figure 3 This is a schematic diagram of the enlarged structure of the pressure head of the present invention; Figure 4 This is a schematic diagram of the enlarged structure of location A of the present invention; Figure 5 This is an axonometric diagram of the present invention; Figure 6 This is a schematic diagram of the main filter element structure installed in the present invention; Figure 7 This is a schematic diagram of the internal structure of the installation box of the present invention; Figure 8 Axonometric drawing of the installation box of the present invention.

[0020] In the figure: 1 arc chamber, 2 annular chamber, 3 drainage pipe, 4 annular inner boss, 5 connecting sleeve, 6 purification chamber, 7 adjustment gasket, 8 base, 9 main spring, 10 piston, 11 bearing round table, 12 magnet, 13 flow hole, 14 pressure relief pipe, 15 pressure compensation pipe, 16 outlet joint pipe, 17 safety valve, 18 magnetic ring, 19 magnetic steel, 20 signal cover, 21 micro switch 2, 22 signal lamp, 23 micro switch 1, 24 outer shield, 25 gland, 26 detection shell body, 27 pressure-stabilizing filter element, 28 secondary filter chamber, 29 inlet joint pipe, 30 annular chamber, 31 mounting base plate, 32 air holes, 33 pressure-stabilizing channel, 34 buffer spring, 35 guide column, 36 fixed pressure head, 37 movable pressure head, 38 flow gap, 39 through hole, 40 annular filter screen, 41 annular pipe, 42 short pipe, 43 main filter element, 44 upper box body, 45 inlet pipe, 46 outlet pipe, 47 lower box body, 48 pressure cover, 49 pressure cover, 50 inner boss. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] See also Figure 1-8The present invention provides a technical solution: a device and method for detecting flow resistance of a filter coolant element, comprising a detection housing 26, a signal cover 20, an upper box body 44 and a lower box body 47. A bearing truncated platform 11 is arranged at the lower part of the detection housing 26. The lower end of the upper box body 44 is fixedly connected to the bearing truncated platform 11 by a flange, and the upper end of the lower box body 47 is threadedly connected to the bearing truncated platform 11. The upper box body 44 and the lower box body 47 are respectively provided with sealing structures at the connection with the bearing truncated platform 11. The sealing structure can adopt a combination of a rubber ring and a protective ring. The technical means is a conventional structure and will not be described in detail here. The bearing truncated platform 11 is used as a bearing component of the upper box body 44 and the lower box body 47, and is also used to centrally install the detection components, which can make use of the space and reduce The volume of the filter, the interior of the detection shell 26 is provided with an inner boss 50, the inner boss 50 divides the detection shell 26 into a magnetic chamber and a valve chamber, the upper part is provided as the magnetic chamber, the lower part is provided as the valve chamber, the piston 10 is provided in the valve chamber at the lower part of the detection shell 26, the upper end of the piston 10 is inserted into the inner boss 50, the upper end of the piston 10 is in sliding contact with the inner wall of the inner boss 50, and the piston 10 is under the action of elastic force, to achieve a resistance seal with the inner boss 50, the upper part of the piston 10 is provided with a magnetic steel 19, the signal cover 20 is located in the magnetic chamber at the upper part of the detection shell 26, and the signal cover 20 is in sliding contact with the inner boss 50, the signal cover 20 is provided with a magnetic ring 18, the magnetic steel 19 is magnetically matched with the magnetic ring 18, and in the process of the magnetic steel 19 descending, in the magnetic Under the action of force, the magnetic ring 18 rises upward, a micro switch is arranged at the upper end of the detection housing 26, a pressure head matched with the micro switch is arranged on the signal cover 20, an annular chamber 30 is arranged between the inner boss 50 and the piston 10, and a secondary filter chamber 28 is arranged in the outer circumferential direction of the detection housing 26. The detection housing 26 is used as a detection carrier and is cleverly integrated with the secondary filter chamber 28, which reduces the production of parts and components, facilitates rapid assembly, saves processing procedures, and is also convenient for subsequent product inspection and maintenance. The secondary filter chamber 28 is connected with the annular chamber 30 through a pressure stabilizing channel 33. The secondary filter chamber 28 is used as a spare filter chamber. When the filter element is not replaced in time or an emergency failure occurs, the pressure in the lower box 47 increases, the piston 10 moves downward, and the coolant passes. The pressure-stabilizing channel 33 enters the secondary filter chamber 28 for filtration, providing sufficient coolant for the cooling system, maintaining the system pressure balance, and meeting special needs. This structure can effectively meet the cooling work of important cooling systems, such as aircraft oil systems. A drainage pipe 3 is arranged in the circumferential direction of the lower part of the detection shell 26. The drainage pipe 3 passes through the bearing truncated table 11 to the lower box 47. The drainage pipe 3 directly drains the coolant in the detection shell 26 to the detection shell 26 to ensure that the detection flow resistance is more accurate. The upper surface of the bearing truncated table 11 is provided with an arc chamber 1 and an annular chamber 2 from the inside to the outside. A magnet 12 is arranged at the bottom of the arc chamber 1. There is a flow gap 38 above the magnet 12. The flow gap 38 is connected to the arc chamber 1, and the arc chamber 1 is connected to the lower box 47.The cooperation of the arc chamber 1 and the annular chamber 2 not only plays the role of diverting the coolant in the circumferential direction without impacting the filter element, but also can adsorb the magnetic substances in the coolant, which can effectively solve the magnetic substances in the system without the need to set up a special demagnetization device.

[0023] The micro switch is fixed on the mounting base plate 31, and the mounting base plate 31 is fixed to the upper end of the detection housing 26 by screws. The micro switch includes a micro switch 1 23 and a micro switch 21, and the fixing position of the micro switch 21 is higher than the micro switch 1 23. The detection functions of two different states of the device are realized by the micro switch 1 23 and the micro switch 21 to meet the use requirements. The pressure head includes a movable pressure head 37 and a fixed pressure head 36. The fixed pressure head 36 is fixed on the signal cover 20. The fixed pressure head 36 corresponds to the contact of the micro switch 21. The movable pressure head 37 is slidably connected to the signal cover 20 through a guide column 35, and a buffer is sleeved on the guide column 35. The impact spring 34 and the movable pressure head 37 correspond to the contacts of the micro switch 23. The movable pressure head 37 is a movable structure. When the movable pressure head 37 triggers the micro switch 23, the state is a prompt state. Only the main filter element 43 needs to be replaced. The buffer spring 34 enables the signal cover 20 to continue to move upward. When the replacement is not timely or cannot be replaced, for example, when the aircraft is performing a mission, the flow resistance will continue to increase, the signal cover 20 continues to move upward, and the fixed pressure head 36 triggers the micro switch 21. This state is a warning state. The main filter element 43 and the pressure-stabilizing filter element 27 need to be replaced at the same time. After performing the flight mission, they need to be replaced immediately.

[0024] An outer protective cover 24 is screwed to the upper end of the detection shell 26, and a signal light 22 is arranged on the top surface of the outer protective cover 24. The signal lights 22 are set to three, namely a blue light, a yellow light and a red light. The micro switch 1 23 is electrically connected to the yellow light. When the prompt state is reached, the yellow light is on. The micro switch 2 21 is electrically connected to the red light. When the warning state is reached, the red light and the yellow light are on at the same time. When the filter is working normally, the blue light is on.

[0025] A connecting sleeve 5 is provided on the lower surface of the bearing truncated platform 11, and a main filter element 43 is threadedly connected to the connecting sleeve 5. The main filter element 43 is composed of an upper end cover, a lower end cover, a skeleton and a filter layer. The upper end cover is connected to the connecting sleeve 5 by a threaded manner. The main filter element 43 and the pressure-stabilizing filter element 27 are both conventional structures. An annular inner boss 4 is provided on the inner side of the connecting sleeve 5, and the installation position of the main filter element 43 is limited by the annular inner boss 4. A purification chamber 6 is provided on the bearing truncated platform 11, and the purification chamber 6 is connected to the inner cavity of the main filter element 43. The outlet joint pipe 16 is connected to the purification chamber 6 The outlet joint pipe 16 is connected to the secondary filter chamber 28 through the pressure-compensating pipe 15. The flow rate of the coolant in the outlet joint pipe 16 is increased through the pressure-compensating pipe 15. A safety valve 17 is arranged on the detection housing 26. The safety valve 17 is connected to the outlet joint pipe 16 through the pressure relief pipe 14. The safety valve 17 plays a role in protecting the cooling system. In an emergency, the main filter element 43 and the pressure-stabilizing filter element 27 are both in a blocked state or in an abnormal working state. The safety valve 17 is opened, and the coolant is directly discharged into the outlet joint pipe 16. This structure is a protective structure and is generally not opened.

[0026] At least three arc chambers 1 are arranged, and the arc chambers 1 are evenly distributed along the center of the detection shell 26. An inlet joint pipe 29 is arranged on one side of the detection shell 26. The lower part of the inlet joint pipe 29 is connected with an annular pipe 41. The annular pipe 41 is connected with the arc chamber 1 through a short pipe 42. The coolant entering the inlet joint pipe 29 is circumferentially diverted by the annular pipe 41, and then flows to the arc chamber 1 through the short pipe 42, and then turns downward and flows through the flow gap 38 to the annular chamber 2. In the process of turning, the flow rate of the coolant is slowed down, and the magnetic material in the coolant is adsorbed. A through hole 39 is opened at the bottom of the side of the arc chamber 1, and the through hole 39 is connected with the flow gap 38. The through hole 39 is used to increase the area of ​​the flow gap 38 and increase the flow rate.

[0027] An inlet pipe 45 and an outlet pipe 46 are respectively provided on both sides of the upper box body 44. The lower end of the inlet pipe 45 is inserted into the inlet joint pipe 29, and the lower end of the outlet pipe 46 is inserted into the outlet joint pipe 16. Sealing rings are provided at the joints of the joint pipes for sealing. A sealing ring is also provided between the upper box body 44 and the outer wall of the secondary filter chamber 28 for sealing.

[0028] A pressure-stabilizing filter element 27 is provided in the secondary filter chamber 28. When the oil pressure in the cooling system is insufficient, the pressure-stabilizing filter element 27 is a spare filter element to filter the oil to make up for the shortage of oil in the system, ensure the safe and reliable operation of the equipment, and meet the use requirements. A pressure cap 25 is provided at the upper end of the secondary filter chamber 28. The pressure cap 25 is threadedly connected to the secondary filter chamber 28. Sealing gaskets are provided between the pressure cap 25 and the upper end cover of the pressure-stabilizing filter element 27 and the detection housing 26 for sealing.

[0029] An annular filter screen 40 is arranged in the annular chamber 2. The annular filter screen 40 is made of a perforated metal plate. The annular filter screen 40 mainly disperses the coolant and performs coarse filtration at the same time to reduce the possibility of large particles blocking the filter element. The annular chamber 2 and the arc chamber 1 can also be used as dirt holding chambers. Under the same installation space, the dirt holding capacity of the device is increased and the service life of the equipment is extended. The bearing truncated table 11 is provided with a flow hole 13 in the circumferential direction. The annular chamber 2 is connected with the lower box body 47 through the flow hole 13.

[0030] The structures of the arc chamber 1 and the annular chamber 2 are cleverly combined to form a similar dispersed slender channel and baffle structure. The through holes 39 and the flow gap 38 on the baffle cooperate with the magnet 12. The magnetic field strength at the edges of the through holes 39 and the flow gap 38 is relatively large. This structure can effectively distribute the magnetic field of the magnet 12 on the surface of each channel, thereby increasing the utilization efficiency of the magnetic field. At the same time, the magnetic impurities adsorbed on the surface of each channel form more pores on the channel surface, which can adsorb fine non-magnetic impurities and effectively improve the service life of the filter element.

[0031] A base 8 is provided at the lower end of the detection housing 26, and the base 8 is screwed to the detection housing 26. A center hole is provided in the center of the base 8, and the filtered coolant enters the detection housing 26 through the center hole. A main spring 9 is provided between the base 8 and the piston 10. Under the action of the main spring 9, the piston 10 is in a balanced state. The device works normally, the green light is on, and an adjustment gasket 7 is provided between the upper end of the main spring 9 and the bottom of the hole of the piston 10. By adjusting the gasket 7, the elastic force of the main spring 9 can be adjusted, and the opening pressure of the piston 10 can be changed to meet the use requirements.

[0032] A method for detecting flow resistance of a filter coolant element, the method for detecting a normal state, a prompt state and a warning state, comprises the following steps: S1: Normal state, the coolant in the inlet joint pipe 29 enters the arc chamber 1 after being circumferentially diverted by the annular pipe 41, and then enters the lower box 47 through the annular chamber 2. The arc chamber 1 and the annular chamber 2 perform preliminary filtration on the coolant. After being filtered by the main filter element 43, the coolant enters the purification chamber 6 upward and is discharged through the outlet joint pipe 16. The green light is on during normal operation; The green light is always on in normal state, and is off in prompt state and warning state; S2: Prompt state. After the main filter element 43 has worked for a period of time, the pressure difference before and after the main filter element 43 becomes larger, and the pressure overcomes the elastic force of the main spring 9, and the piston 10 moves downward. During this process, the magnetic steel 19 drives the magnetic ring 18 and the signal cover 20 upward, and the movable pressure head 37 contacts the contact of the micro switch 23. The micro switch 23 is turned on, and the yellow light is on. At this time, only the main filter element 43 needs to be replaced. In the prompt state, the annular chamber 30 is not connected to the lower box of the detection housing 26, and the pressure-stabilizing filter element 27 in the secondary filter chamber 28 is in a non-working state. S3: Warning state. When the main filter element 43 is not replaced in time, as the working time increases, the pressure overcomes the elastic force of the main spring 9 to drive the piston 10 to continue to move downward, the signal cover 20 moves upward, the micro switch 1 23 is still in the on state, the fixed pressure head 36 contacts the contact of the micro switch 21, the micro switch 21 is turned on, the yellow light and the red light are on at the same time, and the main filter element 43 and the pressure-stabilizing filter element 27 need to be replaced at the same time; S4: In S3, the coolant in the lower box 47 enters the detection housing 26 through the drainage pipe 3, and then enters the annular chamber 30 upwards. The unfiltered coolant enters the secondary filter chamber 28 through the pressure stabilizing channel 33. The coolant filtered by the pressure stabilizing filter element 27 enters the outlet joint pipe 16 through the pressure compensation pipe 15. In this step, the normal operation of the cooling system is protected to ensure that the aircraft can operate normally when the filter element cannot be replaced, so as to meet the safety and reliability requirements. S5: In the warning state, the filter element is not replaced in time. When the pressure in the detection housing 26 is greater than the opening pressure of the safety valve 17, the safety valve 17 opens, and the unfiltered coolant passes through the safety valve 17 and the pressure relief pipe 14 directly into the outlet joint pipe 16. This step is opened only in case of a crisis in order to protect the coolant pressure in the cooling system to be normal.

[0033] The present invention adopts a new layout. During normal operation, the working mode of the arc chamber 1-annular chamber 2-lower box 47-main filter element 43-purification chamber 6-outlet joint pipe 16 prolongs the flow channel of the coolant, increases the dirt holding capacity, and improves the service life of the filter element. When in the warning state, the working mode of the arc chamber 1-annular chamber 2-lower box 47-main filter element 43-purification chamber 6-outlet joint pipe 16 and the working mode of the arc chamber 1-annular chamber 2-lower box 47-drainage pipe 3-detection housing 26-secondary filter chamber 28-pressure-stabilizing filter element 27-outlet joint pipe 16 are performed synchronously to ensure safe and stable operation of the system.

[0034] The basic principles, main features and advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also be subject to various changes and improvements, which all fall within the scope of the present invention to be protected.

Claims

1. A device for detecting flow resistance of a filter coolant element, comprising a detection housing (26), a signal cover (20), an upper housing (44) and a lower housing (47), characterized in that: A bearing truncated platform (11) is provided at the lower part of the detection housing (26); the lower end of the upper box body (44) is fixedly connected to the bearing truncated platform (11) via a flange; the upper end of the lower box body (47) is threadedly connected to the bearing truncated platform (11); an inner boss (50) is provided inside the detection housing (26); the inner boss (50) divides the detection housing (26) into a magnetic chamber and a valve chamber; a piston (10) is provided in the valve chamber at the lower part of the detection housing (26); the upper end of the piston (10) is inserted into the inner boss (50); a magnetic steel (19) is provided at the upper part of the piston (10); a signal cover (20) is located in the magnetic chamber at the upper part of the detection housing (26); the signal cover (20) is in sliding contact with the inner boss (50); a magnetic ring (18) is provided on the signal cover (20); and a magnetic ring (18) is provided at the upper end of the detection housing (26). A micro switch, a pressure head cooperating with the micro switch is arranged on the signal cover (20), an annular chamber (30) is arranged between the inner boss (50) and the piston (10), a secondary filter chamber (28) is arranged in the outer circumferential direction of the detection shell (26), the secondary filter chamber (28) is connected to the annular chamber (30) through a pressure stabilizing channel (33), a drainage pipe (3) is arranged in the circumferential direction of the lower part of the detection shell (26), the drainage pipe (3) passes through the supporting truncated table (11) to the lower box (47), an arc chamber (1) and an annular chamber (2) are arranged on the upper surface of the supporting truncated table (11) from the inside to the outside, a magnet (12) is arranged at the bottom of the arc chamber (1), a flow gap (38) is arranged above the magnet (12), the flow gap (38) is connected to the arc chamber (1), and the arc chamber (1) is connected to the lower box (47).

2. A device for detecting flow resistance of a filter coolant element according to claim 1, characterized in that: The micro switch is fixed on a mounting base plate (31), the mounting base plate (31) is fixed to the upper end of the detection housing (26) by screws, the micro switch comprises a micro switch 1 (23) and a micro switch 2 (21), and the micro switch 2 (21) is fixed at a position higher than the micro switch 1 (23), the pressure head comprises a movable pressure head (37) and a fixed pressure head (36), the fixed pressure head (36) is fixed on the signal cover (20), the fixed pressure head (36) corresponds to the contact of the micro switch 2 (21), the movable pressure head (37) is slidably connected to the signal cover (20) via a guide column (35), a buffer spring (34) is sleeved on the guide column (35), and the movable pressure head (37) corresponds to the contact of the micro switch 1 (23).

3. A device for detecting flow resistance of a filter coolant element according to claim 2, characterized in that: An outer protective cover (24) is screwed onto the upper end of the detection housing (26), and a signal light (22) is arranged on the top surface of the outer protective cover (24). The signal lights (22) are arranged in three numbers, namely, a blue light, a yellow light and a red light. A micro switch 1 (23) is electrically connected to the yellow light, and a micro switch 2 (21) is electrically connected to the red light.

4. A device for detecting flow resistance of a filter coolant element according to claim 3, characterized in that: A connecting sleeve (5) is provided on the lower surface of the supporting truncated table (11), the connecting sleeve (5) is threadedly connected to a main filter element (43), an annular inner boss (4) is provided on the inner side of the connecting sleeve (5), a purification chamber (6) is provided on the supporting truncated table (11), the purification chamber (6) is connected to the inner cavity of the main filter element (43), an outlet joint pipe (16) is connected to the purification chamber (6), the outlet joint pipe (16) is connected to the secondary filter chamber (28) via a pressure compensation pipe (15), a safety valve (17) is provided on the detection housing (26), and the safety valve (17) is connected to the outlet joint pipe (16) via a pressure relief pipe (14).

5. A device for detecting flow resistance of a filter coolant element according to claim 4, characterized in that: At least three arc chambers (1) are provided, and the arc chambers (1) are evenly distributed along the center of the detection housing (26); an inlet joint pipe (29) is provided on one side of the detection housing (26); a ring pipe (41) is connected to the lower part of the inlet joint pipe (29); the ring pipe (41) is connected to the arc chamber (1) via a short pipe (42); a through hole (39) is provided at the bottom of the side of the arc chamber (1); the through hole (39) is connected to the flow gap (38).

6. A device for detecting flow resistance of a filter coolant element according to claim 5, characterized in that: An inlet pipe (45) and an outlet pipe (46) are respectively provided on the two side surfaces of the upper box body (44). The lower end of the inlet pipe (45) is inserted into the inlet joint pipe (29), and the lower end of the outlet pipe (46) is inserted into the outlet joint pipe (16).

7. The device for detecting flow resistance of a filter coolant element according to claim 1, characterized in that: A pressure-stabilizing filter element (27) is arranged in the secondary filter chamber (28), a pressure cover (25) is arranged at the upper end of the secondary filter chamber (28), and the pressure cover (25) is threadedly connected to the secondary filter chamber (28).

8. The device for detecting flow resistance of a filter coolant element according to claim 1, characterized in that: An annular filter screen (40) is arranged in the annular chamber (2). The annular filter screen (40) is made of a punched metal plate. A flow hole (13) is arranged in the circumferential direction of the supporting truncated platform (11). The annular chamber (2) is connected to the lower box body (47) through the flow hole (13).

9. The device for detecting flow resistance of a filter coolant element according to claim 1, characterized in that: A base (8) is provided at the lower end of the detection housing (26), the base (8) being screwed to the detection housing (26), a center hole being provided at the center of the base (8), a main spring (9) being provided between the base (8) and the piston (10), and an adjustment gasket (7) being provided between the upper end of the main spring (9) and the bottom of the hole of the piston (10).

10. A method for detecting flow resistance of a filter coolant element, characterized in that: The device for detecting flow resistance of a filter coolant element according to claim 6 is used, and the detection method is used to detect a normal state, a prompt state, and a warning state, comprising the following steps: S1: In normal state, the coolant in the inlet joint pipe (29) enters the arc chamber (1) after being circumferentially diverted by the annular pipe (41), and then enters the lower box body (47) through the annular chamber (2). The coolant passes through the main filter element (43) and then flows upward into the purification chamber (6), and is discharged through the outlet joint pipe (16). The green light is on during normal operation; S2: Prompt state. After the main filter element (43) has been working for a period of time, the pressure difference between the front and rear of the main filter element (43) increases. The pressure overcomes the elastic force of the main spring (9), and the piston (10) moves downward. During this process, the magnet (19) drives the magnetic ring (18) and the signal cover (20) upward, and the movable pressure head (37) contacts the contact of the micro switch 1 (23). The micro switch 1 (23) is turned on and the yellow light is on. At this time, only the main filter element (43) needs to be replaced. S3: Warning state. When the main filter element (43) is not replaced in time, as the working time increases, the pressure overcomes the elastic force of the main spring (9) and drives the piston (10) to continue to move downward, the signal cover (20) moves upward, the micro switch 1 (23) is still in the on state, the fixed pressure head (36) contacts the contact of the micro switch 2 (21), the micro switch 2 (21) is turned on, and the yellow light and the red light are on at the same time. At this time, the main filter element (43) and the pressure-stabilizing filter element (27) need to be replaced at the same time. S4: In S3, the coolant in the lower box (47) enters the detection housing (26) through the drainage pipe (3), and then enters the annular chamber (30) upward, and the unfiltered coolant enters the secondary filter chamber (28) through the pressure stabilizing channel (33), and the coolant filtered by the pressure stabilizing filter element (27) enters the outlet joint pipe (16) through the pressure compensation pipe (15); S5: In the warning state, the filter element is not replaced in time. When the pressure in the detection housing (26) is greater than the opening pressure of the safety valve (17), the safety valve (17) opens, and the unfiltered coolant passes through the safety valve (17) and the pressure relief pipe (14) directly into the outlet joint pipe (16).

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