A device and method for detecting the flow resistance of a filter coolant filter element

Abstract

The present invention discloses a flow resistance detection device and method for a filter coolant filter element, including a detection housing, a signal cover, an upper box body and a lower box body. A bearing frustum is arranged at the lower part of the detection housing. The lower end of the upper box body is fixedly connected to the bearing frustum through a flange, and the upper end of the lower box body is threadedly connected to the bearing frustum. An inner convex platform is arranged inside the detection housing, and the inner convex platform divides the detection housing into a magnetic force chamber and a valve chamber. A piston is arranged in the valve chamber at the lower part of the detection housing, the upper end of the piston is inserted into the inner convex platform, a magnetic steel is arranged on the upper part of the piston, the signal cover is located in the magnetic force chamber at the upper part of the detection housing, and the signal cover is in sliding contact with the inner convex platform. A magnetic ring is arranged on the signal cover, and a microswitch is arranged at the upper end of the detection housing; this device realizes a clever combination with the filter, completely changes the traditional plug-in installation method of the signal device, and realizes linkage operation with the filter element to ensure the safe and reliable operation of the filter.

Description

Technical Field

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

[0002] Nowadays, for the confirmation of the usage and maintenance time of filter products, a regular maintenance method is generally adopted, that is, the filter element is replaced regularly. For example, in the cooling systems of aircraft or some important equipment. However, this method of regularly replacing the filter element is not scientific and is likely to cause two results. One is that the flow resistance is already relatively high and the pressure loss is large, but it has not reached the time for regular maintenance, resulting in a reduction in the performance of the cooling system. The other is that the product can still be used within the required range, but regular replacement causes performance waste and cost waste. Therefore, in this case, a device that can detect the pressure difference before and after the filter element is needed. The current method is to directly install a differential pressure signaler before and after the filter or the filter element. The installation method is an insertion type or a conduit connection installation method. The differential pressure signaler is designed separately from the filter. When the detected core flow reaches the requirement, an alarm signal is sent. For example, in the patent publication number CN207485778U, a split-type voltage difference signaler structure is disclosed. The voltage difference signaler of this structure includes an upper housing, 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. This split-type voltage difference signaler is an insertion type structure. The defect is that it is only a single signaler with a single function and cannot be integrated with the filter. It can only detect whether the pressure difference meets the standard and lacks the 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 signaler is a common structure in the current market. Similarly, the patent publication numbers CN209434041U, CN211133218U, CN 210050129U, CN212779713U, CN206785491U, and CN210603699U also have the above problems, all of which are external installation structures, and the differential pressure detection is achieved by respectively connecting the high-pressure chamber and the low-pressure chamber.

[0003] Chinese Patent Application No. 202111310305.9 discloses an early warning bypass integrated small pressure difference signal device, which includes a signal device component, a pressure difference component and a housing. The magnetic force between the active magnet and the passive magnet of the present invention is perpendicular to the axial direction of the valve core, effectively reducing the external force borne by the valve core. Adopting an integrated design, without adding components to achieve the bypass function while realizing the alarm function. Although this pressure difference signal device adopts an integrated design and only concentrates the bypass valve inside the oil filter on the signal device, it still adopts an inserted structure and is designed separately from the filter, occupying the installation space of the equipment and unable to realize the linkage with the filter filtration system. When the filter element of the aircraft cannot be replaced in time, it cannot ensure the safe and reliable operation of the system, and cannot meet the requirements in actual use. Therefore, there is an urgent need for improved technology 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 the coolant filter element of a filter. This device realizes a clever combination with the filter, completely changes the traditional inserted installation method of the signal device, and realizes linkage with the filter element to ensure the safe and reliable operation of the filter, and can effectively solve the problems in the background technology.

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

[0006] Further, the microswitch is fixed on the mounting base plate, and the mounting base plate is fixed to the upper end of the detection housing by screws. The microswitch includes a first microswitch and a second microswitch, and the fixing position of the second microswitch is higher than that of the first microswitch. The pressing head includes a movable pressing head and a fixed pressing head. The fixed pressing head is fixed on the signal cover, and the fixed pressing head corresponds to the contact of the second microswitch. The movable pressing head is slidably connected to the signal cover through a guide post. A buffer spring is sleeved on the guide post. The movable pressing head corresponds to the contact of the first microswitch, and the movable pressing head is a movable structure.

[0007] Further, an outer cover is screwed to the upper end of the detection housing. A signal lamp is arranged on the top surface of the outer cover. There are three signal lamps, which are divided into a blue lamp, a yellow lamp and a red lamp. The first microswitch is electrically connected to the yellow lamp, and the second microswitch is electrically connected to the red lamp.

[0008] Further, a connecting sleeve is arranged on the lower surface of the bearing frustum. The connecting sleeve is threadedly connected with the main filter element. An annular inner convex platform is arranged inside the connecting sleeve. A purification chamber is arranged on the bearing frustum. The purification chamber is communicated with the inner cavity of the main filter element. An outlet joint pipe is connected to the purification chamber. The outlet joint pipe is communicated with the secondary filter chamber through a pressure supplement pipe. A safety valve is arranged on the detection housing. The safety valve is communicated with the outlet joint pipe through a pressure relief pipe.

[0009] Further, at least three arc-shaped chambers are arranged, and the arc-shaped chambers are evenly distributed along the center of the detection housing. An inlet joint pipe is arranged on one side of the detection housing. The lower part of the inlet joint pipe is connected with an annular pipe. The annular pipe is communicated with the arc-shaped chambers through short connecting pipes. Through holes are opened at the bottom of the side surface of the arc-shaped chambers. The through holes are communicated with the flow-through gap.

[0010] Further, an inlet pipe and an outlet pipe are respectively arranged on both side surfaces of the upper box body. The lower end of the inlet pipe is inserted onto the inlet joint pipe, and the lower end of the outlet pipe is inserted onto the outlet joint pipe.

[0011] Further, a pressure stabilizing filter element is arranged in the secondary filter chamber. A gland is arranged at the upper end of the secondary filter chamber. The gland is threadedly connected with the secondary filter chamber.

[0012] Further, an annular filter screen is arranged in the annular chamber. The annular filter screen is made of a punched metal plate. Flow-through holes are arranged in the circumferential direction of the bearing frustum. The annular chamber is communicated with the lower box body through the flow-through holes.

[0013] Further, a base is arranged at the lower end of the detection housing. The base is screwed to the detection housing. A central hole is arranged at the center of the base. A main spring is arranged between the base and the piston. An adjusting gasket is arranged between the upper end of the main spring and the bottom of the hole of the piston.

[0014] A method for detecting the flow resistance of the coolant filter element, which is used to detect the normal state, the prompt state and the warning state, includes the following steps:

[0015] S1: Normal state. The coolant in the inlet connector pipe is circumferentially diverted through the annular pipe and then enters the arc chamber, and then enters the lower box through the annular chamber. After being filtered by the main filter element, the coolant enters the purification chamber upward and is discharged through the outlet connector pipe. The green light is on during normal operation.

[0016] S2: Prompt state. After the main filter element works for a period of time, the pressure difference between the front and back of the main filter element becomes larger. The pressure overcomes the elastic force of the main spring, and the piston moves downward. During this process, the magnet moves downward, driving the magnetic ring and the signal cover upward. The movable contact head contacts the contact of the microswitch 1, and the microswitch 1 is turned on. The yellow light is on. At this time, only the main filter element needs to be replaced.

[0017] S3: Warning state. When the main filter element is not replaced in time, as the working time extends, the pressure overcomes the elastic force of the main spring and drives the piston to continue moving downward. The signal cover moves upward. The microswitch 1 is still in the on state. The fixed contact head contacts the contact of the microswitch 2, and the microswitch 2 is turned on. The yellow light and the red light are on at the same time. At this time, both the main filter element and the voltage stabilizing filter element need to be replaced.

[0018] S4: In S3, the coolant in the lower box enters the detection housing through the drain pipe, and then enters the annular chamber upward. The unfiltered coolant enters the secondary filter chamber through the voltage stabilizing channel, and the coolant filtered by the voltage stabilizing filter element enters the outlet connector pipe through the pressure compensation pipe.

[0019] S5: In the warning state, when 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 directly enters the outlet connector pipe through the safety valve and the pressure relief pipe.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The detachable structure design of the upper and lower boxes is adopted. The bearing frustum realizes the centralized installation of the detection structure and the filtration system, which is beneficial to the utilization of space and reduces the volume of the filter. The device is combined with the filter ingeniously, completely changing the traditional plug-in installation method of the signal device, and realizing the linkage operation with the filter element to ensure the safe and reliable operation of the filter.

[0022] 2. It has two functions of 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 sent. At this time, only the main filter element needs to be replaced, 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. The filter can still meet the normal and stable working requirements in the prompt state, meeting the requirement of not being able to replace the main filter element in time in special environments.

[0023] 3. The structure of the present invention is compact, with 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, is easy to use. An arc chamber and an annular chamber are designed on the bearing turntable to achieve the preliminary filtration of the filter element. During the process of the coolant turning to the annular chamber, the flow rate of the coolant is slowed down, and at the same time, magnetic substances in the coolant are adsorbed, increasing the dirt capacity. At the same time, it can effectively resist the fluctuation of the coolant flow rate and improve the service life of the equipment.

[0024] 4. Using the detection housing as the detection carrier, it is ingeniously integrated with the secondary filter chamber, reducing the generation of parts, facilitating quick assembly, saving processing procedures, and also facilitating the subsequent maintenance and repair of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the present invention;

[0026] Figure 2 It is a schematic enlarged structural diagram of the piston of the present invention;

[0027] Figure 3 It is a schematic enlarged structural diagram of the pressure head of the present invention;

[0028] Figure 4 It is a schematic enlarged structural diagram of part A of the present invention;

[0029] Figure 5 It is an axonometric drawing of the present invention;

[0030] Figure 6 It is a schematic structural diagram of installing the main filter element of the present invention;

[0031] Figure 7 It is a schematic internal structural diagram of the installation box of the present invention;

[0032] Figure 8 It is an axonometric drawing of the installation box of the present invention.

[0033] In the figure: 1 arc chamber, 2 annular chamber, 3 drain pipe, 4 annular inner convex platform, 5 connecting sleeve, 6 purification chamber, 7 adjusting gasket, 8 base, 9 main spring, 10 piston, 11 bearing round platform, 12 magnet, 13 flow-through 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 II, 22 signal lamp, 23 micro switch I, 24 outer protective cover, 25 gland, 26 detection housing, 27 voltage stabilizing filter element, 28 secondary filter chamber, 29 inlet joint pipe, 30 annular cavity, 31 mounting base plate, 32 air through hole, 33 voltage stabilizing channel, 34 buffer spring, 35 guide post, 36 fixed pressure head, 37 movable pressure head, 38 flow-through gap, 39 through hole, 40 annular filter screen, 41 annular pipe, 42 short connecting pipe, 43 main filter element, 44 upper box body, 45 inlet pipe, 46 outlet pipe, 47 lower box body, 48 gland, 49 gland, 50 inner convex platform. Detailed implementation mode

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 construed as a limitation to the present invention.

[0035] Please refer to Figure 1-8, the present invention provides a technical solution: a device and method for detecting the flow resistance of a coolant filter element, including a detection housing 26, a signal cover 20, an upper box body 44 and a lower box body 47. A bearing frustum 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 frustum 11 through a flange. The upper end of the lower box body 47 is threadedly connected to the bearing frustum 11. Sealing structures are provided at the joints between the upper box body 44 and the lower box body 47 and the bearing frustum 11 respectively. The sealing structure can adopt a combination of a rubber ring and a protective ring. This technical means is a conventional structure and will not be introduced in detail here. The bearing frustum 11 serves as a bearing component for the upper box body 44 and the lower box body 47, and is also used for centrally installing detection components, which is beneficial to the utilization of space and reduces the volume of the filter. 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. The upper part is the magnetic chamber, and the lower part is the valve chamber. A piston 10 is arranged 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. 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 in contact and sealed with the inner boss 50 under the action of elastic force. A magnetic steel 19 is provided at the upper part of the piston 10. The signal cover 20 is located in the magnetic chamber at the upper part of the detection housing 26, and the signal cover 20 is in sliding contact with the inner boss 50. A magnetic ring 18 is provided on the signal cover 20. The magnetic steel 19 and the magnetic ring 18 are magnetically matched. During the process of the magnetic steel 19 descending, the magnetic ring 18 rises upward under the action of magnetic force. A microswitch is provided at the upper end of the detection housing 26. A pressure head is provided on the signal cover 20 to cooperate with the microswitch. An annular chamber 30 is provided between the inner boss 50 and the piston 10. A secondary filter chamber 28 is provided on 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, reducing the generation of parts, facilitating quick assembly, saving processing procedures, and also facilitating the subsequent maintenance and repair of the product. The secondary filter chamber 28 is communicated with the annular chamber 30 through a pressure stabilizing channel 33. The secondary filter chamber 28 serves as a standby filter chamber. When the filter element is not replaced in time or an emergency failure occurs, resulting in an increase in the pressure of the lower box body 47, the piston 10 moves downward, and the coolant enters the secondary filter chamber 28 through the pressure stabilizing channel 33 for filtration, providing sufficient coolant for the cooling system and maintaining the system pressure balance to meet special requirements. This structure can effectively meet the cooling work of important cooling systems, such as the aircraft oil hydraulic system. A drainage pipe 3 is provided on the lower circumferential direction of the detection housing 26. The drainage pipe 3 passes through the bearing frustum 11 into the lower box body 47. The drainage pipe 3 directly drains the coolant in the detection housing 26 into the detection housing 26 to ensure more accurate detection of the flow resistance. An arc chamber 1 and an annular chamber 2 are provided on the upper surface of the bearing frustum 11 from the inside to the outside. A magnet 12 is provided at the bottom of the arc chamber 1. There is a flow-through gap 38 above the magnet 12. The flow-through gap 38 is communicated with the arc chamber 1. The arc chamber 1 is communicated with the lower box body 47.The cooperation between the arc chamber 1 and the annular chamber 2 not only plays a role in diverting the coolant in the circumferential direction, without impacting the filter element, but also can adsorb magnetic substances in the coolant, effectively solving the problem of magnetic substances in the system and eliminating the need for a dedicated demagnetization device.

[0036] The microswitch 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 microswitch includes microswitch one 23 and microswitch two 21, and the fixing position of microswitch two 21 is higher than that of microswitch one 23. The detection function of two different states of the device is realized through microswitch one 23 and microswitch two 21 to meet the usage requirements. The pressing head includes a movable pressing head 37 and a fixed pressing head 36. The fixed pressing head 36 is fixed on the signal cover 20. The fixed pressing head 36 corresponds to the contact of microswitch two 21. The movable pressing head 37 is slidably connected to the signal cover 20 through a guide post 35. A buffer spring 34 is sleeved on the guide post 35. The movable pressing head 37 corresponds to the contact of microswitch one 23. The movable pressing head 37 is a movable structure. When the movable pressing head 37 triggers microswitch one 23, this state is the prompt state, and only the main filter element 43 needs to be replaced. The buffer spring 34 enables the signal cover 20 to continue moving upward. When the replacement is not timely or cannot be carried out, such as when the aircraft is performing a mission, the flow resistance will continue to increase, and the signal cover 20 continues to move upward. The fixed pressing head 36 triggers microswitch two 21, and this state is the warning state. Both the main filter element 43 and the voltage stabilizing filter element 27 need to be replaced immediately after the flight mission.

[0037] An outer protective cover 24 is screwed to the upper end of the detection housing 26. A signal lamp 22 is arranged on the top surface of the outer protective cover 24. There are three signal lamps 22, namely a blue lamp, a yellow lamp, and a red lamp. Microswitch one 23 is electrically connected to the yellow lamp. When in the prompt state, the yellow lamp lights up. Microswitch two 21 is electrically connected to the red lamp. When in the warning state, both the red lamp and the yellow lamp light up. When the filter is working normally, the blue lamp lights up.

[0038] The lower surface of the load-bearing frustum 11 is provided with a connecting sleeve 5. The connecting sleeve 5 is threadedly connected with a main filter element 43. 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. Both the main filter element 43 and the pressure-stabilizing filter element 27 are of conventional structures. An annular inner convex platform 4 is arranged inside the connecting sleeve 5, and the installation position of the main filter element 43 is restricted by the annular inner convex platform 4. A purification chamber 6 is arranged on the load-bearing frustum 11. The purification chamber 6 is communicated with 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 communicated with the secondary filter chamber 28 through a pressure-supplementing pipe 15. The flow rate of the coolant in the outlet joint pipe 16 is increased through the pressure-supplementing pipe 15. A safety valve 17 is arranged on the detection housing 26. The safety valve 17 is communicated with the outlet joint pipe 16 through a pressure-relief pipe 14. The safety valve 17 plays a role in protecting the cooling system. In an emergency, when both the main filter element 43 and the pressure-stabilizing filter element 27 are in a blocked state or 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 protection structure and is generally not opened.

[0039] At least three arc-shaped chambers 1 are provided, and the arc-shaped chambers 1 are evenly distributed along the center of the detection housing 26. An inlet joint pipe 29 is arranged on one side of the detection housing 26. The lower part of the inlet joint pipe 29 is connected with an annular pipe 41. The annular pipe 41 is communicated with the arc-shaped chambers 1 through short connecting pipes 42. After the coolant entering the inlet joint pipe 29 is circumferentially shunted through the annular pipe 41, it flows to the arc-shaped chambers 1 respectively through the short connecting pipes 42, and then turns downward and flows to the annular chamber 2 through the flow-through gap 38. During the turning process, the flow rate of the coolant is slowed down, and at the same time, the magnetic substances in the coolant are adsorbed. A through hole 39 is opened at the bottom of the side surface of the arc-shaped chamber 1. The through hole 39 is communicated with the flow-through gap 38. The through hole 39 is used to increase the area of the flow-through gap 38 and increase the flow rate.

[0040] Inlet pipes 45 and outlet pipes 46 are respectively arranged on both side surfaces of the upper box body 44. The lower end of the inlet pipe 45 is inserted onto the inlet joint pipe 29, and the lower end of the outlet pipe 46 is inserted onto the outlet joint pipe 16. Sealing rings are arranged at the joint pipe connections for sealing. Sealing rings are also arranged between the upper box body 44 and the outer wall of the secondary filter chamber 28 for sealing.

[0041] A pressure-stabilizing filter element 27 is arranged in the secondary filter chamber 28. When the oil pressure in the cooling system is insufficient, the pressure-stabilizing filter element 27 is a standby filter element, which filters the oil fluid to make up for the shortage of the oil fluid in the system, ensures the safe and reliable operation of the equipment, and meets the use requirements. A gland 25 is arranged at the upper end of the secondary filter chamber 28. The gland 25 is threadedly connected with the secondary filter chamber 28. Sealing gaskets are arranged between the gland 25 and the upper end cover of the pressure-stabilizing filter element 27 and the detection housing 26 for sealing.

[0042] A circular filter screen 40 is provided in the annular chamber 2. The circular filter screen 40 is made of a punched metal plate. The circular filter screen 40 mainly functions to disperse the coolant and at the same time perform coarse filtration to reduce the possibility of large particles blocking the filter element. The annular chamber 2 and the arc-shaped chamber 1 can also serve as dirt-containing cavities, increasing the dirt-containing capacity of the device and extending the service life of the equipment under the same installation space. The circumferential direction of the bearing frustum 11 is provided with flow holes 13, and the annular chamber 2 is communicated with the lower box body 47 through the flow holes 13.

[0043] The structures of the arc-shaped chamber 1 and the annular chamber 2 are ingeniously combined to form a structure similar to a dispersive slender channel and a baffle. Under the cooperation of the through holes 39 and the flow gaps 38 on the baffle and the magnet 12, the magnetic field intensity at the edges of the through holes 39 and the flow gaps 38 is relatively large. This structure can effectively distribute the magnetic field of the magnet 12 on the surfaces of each channel, increasing the magnetic field utilization efficiency. At the same time, the magnetic impurities adsorbed on the surfaces of each channel form more pores on the channel surfaces, which can adsorb fine non-magnetic impurities and effectively extend the service life of the filter element.

[0044] A base 8 is provided at the lower end of the detection housing 26. The base 8 is screwed to the detection housing 26. A central hole is provided at the center of the base 8. The filtered coolant enters the detection housing 26 through the central 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 and the device works normally, and the green light is on. An adjusting gasket 7 is provided between the upper end of the main spring 9 and the bottom of the hole of the piston 10. The elastic force of the main spring 9 can be adjusted through the adjusting gasket 7 to change the opening pressure of the piston 10 to meet the use requirements.

[0045] A method for detecting the flow resistance of a coolant filter element of a filter, which is used to detect the normal state, the prompt state and the warning state, includes the following steps:

[0046] S1: In the normal state, the coolant in the inlet joint pipe 29 is circumferentially diverted through the annular pipe 41 and then enters the arc-shaped chamber 1, and then enters the lower box body 47 through the annular chamber 2. The arc-shaped chamber 1 and the annular chamber 2 perform preliminary filtration on the coolant. After the coolant is filtered by the main filter element 43 and enters the purification chamber 6 upward, it is discharged through the outlet joint pipe 16. When working normally, the green light is on;

[0047] In the normal state, the green light is always on. When in the prompt state and the warning state, the green light is off;

[0048] S2: Prompt state. After the main filter element 43 has been working for a period of time, the pressure difference before and after the main filter element 43 becomes larger. The pressure overcomes the elasticity of the main spring 9, and the piston 10 moves downward. During this process, the magnet steel 19 drives the magnetic ring 18 and the signal cover 20 upward. The movable pressure head 37 contacts the contact of the microswitch one 23, and the microswitch one 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 body of the detection housing 26, and the pressure stabilizing filter element 27 in the secondary filter chamber 28 is in a non-working state;

[0049] S3: Warning state. When the main filter element 43 is not replaced in time, as the working time extends, the pressure overcomes the elasticity of the main spring 9 and drives the piston 10 to continue moving downward. The signal cover 20 moves upward, and the microswitch one 23 is still in the on state. The fixed pressure head 36 contacts the contact of the microswitch two 21, and the microswitch two 21 is turned on. The yellow light and the red light are on at the same time. At this time, both the main filter element 43 and the pressure stabilizing filter element 27 need to be replaced;

[0050] S4: In S3, the coolant in the lower box body 47 enters the detection housing 26 through the drainage pipe 3, and then enters the annular chamber 30 upward. 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 compensating pipe 15; In this step, it is to protect the normal operation of the cooling system and ensure that the aircraft can operate normally when the filter element cannot be replaced, meeting the requirements of safety and reliability;

[0051] S5: In the warning state, when 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 directly enters the outlet joint pipe 16 through the safety valve 17 and the pressure relief pipe 14. This step is to protect the normal pressure of the coolant in the cooling system in an emergency situation.

[0052] The present invention adopts a brand-new layout method. During normal operation, the working mode is: arc chamber 1 - annular chamber 2 - lower box body 47 - main filter element 43 - purification chamber 6 - outlet joint pipe 16, which extends the flow channel of the coolant, increases the dirt capacity, and improves the service life of the filter element; In the warning state, the working mode of arc chamber 1 - annular chamber 2 - lower box body 47 - main filter element 43 - purification chamber 6 - outlet joint pipe 16 and the working mode of arc chamber 1 - annular chamber 2 - lower box body 47 - drainage pipe 3 - detection housing 26 - secondary filter chamber 28 - pressure stabilizing filter element 27 - outlet joint pipe 16 are carried out synchronously to ensure the safe and stable operation of the system.

[0053] The basic principles, main features and advantages of the present invention have been shown and described above. Without departing from the spirit and scope of the present invention, various changes and improvements are possible, and these fall within the scope of the claimed invention.

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 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) 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 arranged 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 arranged 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 arranged at the upper part of the piston (10); a signal cover (20) is located at the detection housing (26); 6) in the upper magnetic cavity, and the signal cover (20) is in sliding contact with the inner boss (50), a magnetic ring (18) is arranged on the signal cover (20), a micro switch is arranged at the upper end of the detection housing (26), 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 housing (26), a pressure stabilizing filter element (27) is arranged in the secondary filter chamber (28), the secondary filter chamber (28) is connected with the annular chamber (30) through a pressure stabilizing channel (33), and the detection housing (26) is lower. A drainage pipe (3) is arranged in the circumferential direction of the upper part of the support truncated platform (11), and the drainage pipe (3) passes through the support truncated platform (11) to the lower box body (47). The upper surface of the support truncated platform (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). 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 body (47). A connecting sleeve (5) is arranged on the lower surface of the support truncated platform (11). The connecting sleeve (5) is threadedly connected to the main filter element (43). The inner side of the connecting sleeve (5) is provided with an annular inner convex The support truncated platform (4) is provided with a purification chamber (6), the purification chamber (6) is communicated with the inner cavity of the main filter element (43), the purification chamber (6) is connected with an outlet joint pipe (16), the outlet joint pipe (16) is communicated with the secondary filter chamber (28) through a pressure compensation pipe (15), a safety valve (17) is provided on the detection housing (26), the safety valve (17) is communicated with the outlet joint pipe (16) through a pressure relief pipe (14); a base (8) is provided at the lower end of the detection housing (26), a center hole is provided at the center of the base (8), and a main spring (9) is provided between the base (8) and the piston (10);When the filter element is not replaced in time or an emergency failure occurs, the pressure of the lower box (47) increases, the piston (10) moves downward, and the coolant enters the secondary filter chamber (28) through the pressure stabilizing channel (33) for filtration. The micro switch includes a micro switch 1 (23) and a micro switch 2 (21), and the fixed position of the micro switch 2 (21) is higher than that of the micro switch 1 (23). 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 2 (21). The movable pressure head (37) is slidably connected to the signal cover (20) through a guide column (35). A buffer spring (34) is sleeved on the guide column (35). The movable pressure head (37) corresponds to the contact of the micro switch 1 (23). ; 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), and the mounting base plate (31) is fixed to the upper end of the detection housing (26) by means of screws.

3. A device for detecting flow resistance of a filter coolant element according to claim 2, characterized in that: The upper end of the detection housing (26) is screwed with an outer protective cover (24), 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 forms, 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: 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).

5. The device for detecting flow resistance of a filter coolant element according to claim 4, characterized in that: An inlet pipe (45) and an outlet pipe (46) are respectively arranged 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).

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

7. 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), and 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), and the annular chamber (2) is connected to the lower box body (47) through the flow hole (13).

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

9. 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 5 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: 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 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, and the pressure overcomes the elastic force of the main spring (9). 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, 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: When the filter element is not replaced in time in the warning state, 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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