Liquid filtering device

Abstract

The present invention discloses a liquid filtering device, comprising a barrel body and a barrel cover detachably connected to the barrel body, wherein the barrel body and the barrel cover form a hollow cavity; a liquid inlet pipe is arranged above the barrel cover, a liquid outlet pipe is arranged below the barrel body, and a detachable filter screen is arranged between the liquid inlet pipe and the liquid outlet pipe; the filter screen divides the hollow cavity composed of the barrel body and the barrel cover into a to-be-filtered cavity near the liquid inlet pipe for accommodating the to-be-filtered liquid and a filtered cavity near the liquid outlet pipe for accommodating the filtered liquid; a stirring and filtering assembly is arranged in the to-be-filtered cavity; a liquid pump is arranged on the liquid outlet pipe; and the stirring and filtering assembly comprises a flexible suction pipe and a flexible nozzle with one end in a free state. The liquid filtering device of the present invention stirs by spraying a high-speed fluid through a flexible nozzle to generate a reaction force, thereby realizing stirring and circulating filtration at the same time, and has a simple structure, low cost and good maintainability.

Description

Technical Field

[0001] The invention relates to the field of filtering technology, in particular to a liquid filtering device. Background Art

[0002] In industrial production, a filter device is often used to filter out impurities in a liquid, and pressure is usually applied to the liquid to be filtered in order to increase the filtering speed. During the filtering operation, there is a problem that the filter screen is easily blocked. In order to prevent blockage, in the prior art, stirring is generally used to increase the fluidity of the liquid to be filtered, and sometimes a scraper is used to scrape to remove the filter residues that block the filter screen. However, the scraping method has the disadvantages of high friction, high processing precision and high control requirements, and is easy to cause damage to the filter screen.

[0003] Therefore, there is an urgent need to design a liquid filtering device with simple structure, low cost and good maintainability. Summary of the invention

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] A liquid filtering device, characterized in that it comprises a barrel body (10) and a barrel cover (20) detachably connected to the barrel body (10), wherein the barrel body (10) and the barrel cover (20) form a hollow cavity;

[0006] A liquid inlet pipe (21) is arranged above the barrel cover (20), a liquid outlet pipe (11) is arranged below the barrel body (10), and a detachable filter screen (30) is arranged between the liquid inlet pipe (21) and the liquid outlet pipe (11);

[0007] The filter screen (30) divides the hollow cavity formed by the barrel body (10) and the barrel cover (20) into a to-be-filtered cavity near the liquid inlet pipe (21) for accommodating the liquid to be filtered and a filtered cavity near the liquid outlet pipe (11) for accommodating the filtered liquid;

[0008] The filter screen (30) is used to filter specific substances in the liquid to be filtered;

[0009] A stirring and filtering assembly (40) is arranged in the cavity to be filtered;

[0010] The liquid outlet pipe (11) is provided with a liquid pump (60);

[0011] The stirring and filtering assembly (40) comprises a circulation pump (41) and a guide rod (42); a circulation liquid suction pipe (421) and a circulation liquid spray pipe (422) are arranged inside the guide rod (42); one end of the circulation liquid suction pipe (421) and the circulation liquid spray pipe (422) are respectively connected to the inlet and outlet of the circulation pump (41); the other end of the circulation liquid suction pipe (421) and the circulation liquid spray pipe (422) are respectively connected to one end of a flexible suction pipe (45) and a flexible spray pipe (44); the other end of the flexible suction pipe (45) and the flexible spray pipe (44) are in a free state;

[0012] The circulation pump (41) and the liquid extraction pump (60) are electrically connected to the controller respectively.

[0013] Preferably, one end of the guide rod (42) away from the circulation pump (41) is sleeved with a rotating sleeve (43) which can rotate and / or slide along the axis of the guide rod (42); a liquid suction chamber (431) and a liquid spray chamber (432) which are divided by the sleeve surface of the guide rod (42) are arranged inside the rotating sleeve (43); the liquid suction chamber (431) and the liquid spray chamber (432) are respectively connected to the circulation liquid suction pipe (421) and the circulation liquid spray pipe (422); the side walls of the liquid suction chamber (431) and the liquid spray chamber (432) are respectively provided with a flexible suction pipe (45) and a flexible spray pipe (44); one end of the flexible suction pipe (45) and the flexible spray pipe (44) are respectively connected to the liquid suction chamber (431) and the liquid spray chamber (432); the other ends of the flexible suction pipe (45) and the flexible spray pipe (44) are in a free state;

[0014] An upper limit block (423) and a lower limit block (424) are respectively provided at both ends of the rotating sleeve (43) for limiting the liquid suction chamber (431) and the liquid spray chamber (432) from being disconnected from the circulating liquid suction pipe (421) and the circulating liquid spray pipe (422).

[0015] Preferably, the guide rod (42) is a rigid rod-shaped structure, and the flexible suction tube (45) and the flexible nozzle (44) are both flexible hoses with a certain elasticity; the flexible suction tube (45) has a sufficient length and its free end maintains contact with the filter (30) under the action of its own elasticity, and the length of the flexible nozzle (44) is such that its free end is not long enough to contact the filter (30) during movement.

[0016] Preferably, the flexible straws (45) are provided in two or more quantities.

[0017] Preferably, the inlet end of the flexible straw (45) is provided with a straw head (451), and the straw head (451) is provided with two or more liquid suction holes connected to the inlet end of the flexible straw (45).

[0018] Preferably, the pipette head (451) is a spherical structure, and a counterweight cavity for adjusting the weight of the pipette head (451) is provided inside the pipette head (451). By filling the counterweight cavity with a substance having a different density from that of the pipette head (451), the pipette head (451) is kept suspended in the liquid to be filtered.

[0019] Preferably, the stirring and filtering assembly (40) comprises a second filter (46) arranged between the circulating liquid suction pipe (421) and the circulating liquid spraying pipe (422) and located outside the barrel cover (20).

[0020] Preferably, the filter screen (30) and the second filter (46) are any one or a combination of flexible filter materials, rigid filter materials and loose filter materials.

[0021] Preferably, a directional nozzle (433) for rotating the rotating sleeve (43) is provided on the side wall of the liquid spray chamber (432).

[0022] Preferably, a filter retaining ring (31) is provided on the filter (30), and the filter retaining ring (31) is detachably fixed between the barrel body (10) and the barrel cover (20).

[0023] Preferably, the liquid extraction pump (60) is a pneumatic pump, the liquid extraction pump (60) is a pneumatic pump, and the circulation pump (41) is a variable pneumatic pump.

[0024] Preferably, a liquid level sensor (22) is provided on the barrel cover (20), and the liquid level sensor (22) is electrically connected to the controller.

[0025] Preferably, the liquid level sensor (22) is provided with an upper liquid level probe and a lower liquid level probe, the lower liquid level probe is located above the topmost through hole of the filter (30), and the upper liquid level probe is located between the upper liquid level probe and the top of the barrel cover (20).

[0026] Preferably, a pressure sensor (23) is provided on the barrel cover (20), and the pressure sensor (23) is electrically connected to the controller.

[0027] Preferably, the barrel body (10) and the barrel cover (20) are fixed by detachable bolts, and a sealing ring (50) is provided between the barrel body (10) and the barrel cover (20).

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Stirring is performed by spraying high-speed fluid through a flexible nozzle to generate reaction force, so that stirring and circulating filtration can be performed simultaneously. No additional power source is needed for stirring. It has a simple structure, saves costs and has good maintainability.

[0030] 2. The flexible nozzle sprays high-speed fluid to generate reaction force to drive the rotating sleeve to drive the flexible suction pipe to move randomly, so that the flexible suction pipe can randomly absorb the residues generated by filtering at various places of the filter screen to avoid filter blockage; compared with the traditional method of using a scraper to scrape the residue, it has the characteristics of low friction and no need for precise control, and it can randomly clean any position;

[0031] 3. The method of sucking away the residue can avoid the situation where the residue is squeezed into the filter hole when the scraper is scraping and cleaning the residue, which will aggravate the blockage.

[0032] 4. The second filter can be replaced or cleaned without stopping the machine, thus improving the working efficiency;

[0033] 5. The filter screen and the second filter respectively use a combination of different filter materials to achieve the best filtering effect for different types of filtered objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an overall schematic diagram of the present invention;

[0035] Figure 2 It is the overall schematic diagram of the stirring and filtering assembly;

[0036] Figure 3 This is a cross-sectional view of the stirring and filtering assembly.

[0037] Among them: barrel body 10; liquid outlet pipe 11; barrel cover 20; liquid inlet pipe 21; liquid level sensor 22; pressure sensor 23; filter screen 30; filter screen retaining ring 31; stirring and filtering assembly 40; circulating pump 41; guide rod 42; circulating liquid suction pipe 421; circulating liquid spray pipe 422; upper limit block 423; lower limit block 424; rotating sleeve 43; liquid suction chamber 431; liquid spray chamber 432; directional nozzle 433; flexible nozzle 44; flexible suction pipe 45; suction pipe head 451; second filter 46; sealing ring 50; liquid suction pump 60. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments:

[0042] like Figure 1 As shown, a liquid filtering device comprises a barrel body 10 and a barrel cover 20 detachably connected to the barrel body 10, wherein the barrel body 10 and the barrel cover 20 form a hollow cavity;

[0043] A liquid inlet pipe 21 is disposed above the barrel cover 20, a liquid outlet pipe 11 is disposed below the barrel body 10, and a detachable filter screen 30 is disposed between the liquid inlet pipe 21 and the liquid outlet pipe 11;

[0044] The filter screen 30 divides the hollow cavity formed by the barrel body 10 and the barrel cover 20 into a to-be-filtered cavity near the liquid inlet pipe 21 for accommodating the liquid to be filtered and a filtered cavity near the liquid outlet pipe 11 for accommodating the filtered liquid.

[0045] The filter screen 30 is used to filter specific substances in the liquid to be filtered.

[0046] A stirring and filtering assembly 40 is provided in the cavity to be filtered;

[0047] The liquid outlet pipe 11 is provided with a liquid pump 60 , and the liquid pump 60 is electrically connected to the controller.

[0048] In this embodiment, the filter screen 30 uses a barrel-shaped metal perforated plate with an aperture of 75um to filter particles with a particle size greater than 75um (when in use, filters with different apertures or different types can also be selected as needed). When in use, the liquid to be filtered flows into the chamber to be filtered through the liquid inlet pipe 21, and under the action of the liquid pump 60, a pressure difference is generated between the chamber to be filtered and the filtered chamber (the pressure difference can be generated by the liquid pump 60 or by the liquid's own weight), and the liquid to be filtered flows into the filtered chamber after being filtered through the filter screen 30, and the residue generated by the filtration is retained in the chamber to be filtered, and the stirring and filtering assembly 40 stirs and filters the liquid to be filtered in the chamber to be filtered again, and the filtered liquid flows out from the liquid outlet pipe 11 and enters the packaging barrel or the next process.

[0049] Further, such as Figure 1 , 2 As shown in FIG. 3 , the stirring and filtering assembly 40 includes a circulation pump 41 and a guide rod 42, wherein a circulation liquid suction pipe 421 and a circulation liquid spraying pipe 422 are arranged inside the guide rod 42, wherein one end of the circulation liquid suction pipe 421 and the circulation liquid spraying pipe 422 are respectively connected to the inlet and outlet of the circulation pump 41, and the other end of the circulation liquid suction pipe 421 and the circulation liquid spraying pipe 422 are respectively connected to one end of a flexible suction pipe 45 and a flexible spraying pipe 44, and the other end of the flexible suction pipe 45 and the flexible spraying pipe 44 are in a free state;

[0050] The circulation pump 41 is electrically connected to the controller.

[0051] Furthermore, the guide rod 42 is a rigid rod-shaped structure, and the flexible suction pipe 45 and the flexible nozzle 44 are both flexible hoses with a certain elasticity; the flexible suction pipe 45 has a sufficient length and its free end keeps in contact with the filter 30 under its own elasticity, and the length of the flexible nozzle 44 is such that its free end is not long enough to contact the filter during movement;

[0052] When this embodiment is in use, the circulation pump 41 sucks the liquid to be filtered from the flexible suction pipe 45, and then sprays it out from the flexible nozzle 44 at a high speed. Under the action of the elasticity of the flexible nozzle 44 and the reaction force of the sprayed liquid, the flexible nozzle 44 sprays a high-speed fluid with randomly changing angles and positions, so that the liquid in the cavity to be filtered flows irregularly; the flexible suction pipe 45 sucks away the residue on the filter screen. This embodiment stirs and sucks away the residue on the filter screen 30 through random high-speed fluid, thereby avoiding clogging of the filter holes of the filter screen 30.

[0053] Further, such as Figure 1 , 2As shown in FIG. 3 , one end of the guide rod 42 away from the circulation pump 41 is sleeved with a rotating sleeve 43 which can rotate and / or slide along the axis of the guide rod 42, and a liquid suction chamber 431 and a liquid spraying chamber 432 which are divided by the sleeve surface of the guide rod 42 are arranged inside the rotating sleeve 43, and the side walls of the liquid suction chamber 431 and the liquid spraying chamber 432 are respectively provided with a flexible suction pipe 45 and a flexible spraying pipe 44, one end of the flexible suction pipe 45 and the flexible spraying pipe 44 are respectively communicated with the liquid suction chamber 431 and the liquid spraying chamber 432, and the other ends of the flexible suction pipe 45 and the flexible spraying pipe 44 are in a free state;

[0054] The two ends of the rotating sleeve 43 are respectively provided with an upper limit block 423 and a lower limit block 424 for limiting the liquid suction chamber 431 and the liquid spraying chamber 432 from being disconnected from the circulating liquid suction pipe 421 and the circulating liquid spraying pipe 422 .

[0055] The guide rod 42 is a rigid rod-shaped structure, and the flexible suction pipe 45 and the flexible nozzle 44 are both flexible hoses with a certain elasticity; the flexible suction pipe 45 has a sufficient length and its free end keeps in contact with the filter 30 under the action of its own elasticity, and the length of the flexible nozzle 44 is such that its free end is not long enough to contact the filter during movement.

[0056] In this embodiment, the reaction force generated by the flexible nozzle 44 spraying fluid causes the rotating sleeve 43 to randomly rotate and / or slide along the axis of the guide rod 42, so that the flexible suction tube 45 can contact any filter hole of the filter screen 30, better absorb the residue on the filter screen 30, and avoid the filter holes of the filter screen 30 from being blocked.

[0057] Furthermore, the number of the flexible suction tubes 45 is two or more; a larger number of flexible suction tubes 45 can better absorb the residue on the filter screen 30 .

[0058] Furthermore, the inlet end of the flexible straw 45 is provided with a straw head 451, and the straw head 451 is provided with two or more suction holes connected to the inlet end of the flexible straw 45. Providing multiple suction holes on the straw head 451 can increase the efficiency of adsorbing residues, and can also reduce the adsorption force generated when the suction port of the flexible straw 45 is adsorbed with the filter screen, so as to avoid affecting the movement of the flexible straw 45.

[0059] Furthermore, the pipette head 451 is a spherical structure, and a weighted cavity for adjusting the weight of the pipette head 451 is provided inside the pipette head 451. The pipette head 451 is kept suspended in the liquid to be filtered by filling the weighted cavity with a substance having a different density from the pipette head 451. Keeping the suspended state can prevent the pipette head 451 from sinking or floating, which affects the range of activity of the pipette head 451.

[0060] Furthermore, the stirring and filtering assembly 40 includes a second filter 46 disposed between the circulating liquid suction pipe 421 and the circulating liquid spraying pipe 422 and located outside the barrel cover 20 .

[0061] The second filter 46 can be used to clean the residue without opening the barrel cover 20, thereby reducing the frequency of opening the cover to clean the filter 30; and when cleaning the second filter 46, only the circulation pump 41 can be temporarily stopped, which will not affect the normal operation of the filter 30, and the second filter 46 can be replaced or cleaned without stopping the machine, thereby improving the working efficiency.

[0062] Furthermore, the filter screen 30 and the second filter 46 are any one or a combination of flexible filter material, rigid filter material and loose filter material.

[0063] By combining different filter materials, the best combination for different types of filtered objects can be achieved. For example, the filter 30 uses a metal perforated plate to filter particulate matter, and the second filter 46 uses porous ceramics to filter long strip fibers. Different filter materials are selected according to the characteristics of the filtered object to achieve the best filtering effect.

[0064] Furthermore, the side wall of the liquid spraying chamber 432 is provided with a directional nozzle 433 for rotating the rotating sleeve 43. By strengthening the rotation of the rotating sleeve 43, the movement of the flexible suction pipe 45 and the flexible nozzle 44 is strengthened, and the efficiency of adsorbing the residue of the filter screen 30 and stirring is improved.

[0065] Further, a filter retaining ring 31 is provided on the filter 30, and the filter retaining ring 31 is detachably fixed between the barrel body 10 and the barrel cover 20. The filter retaining ring 31 can maintain the edge shape of the filter 30, which is convenient for fixing or disassembly.

[0066] Furthermore, the liquid suction pump 60 is a pneumatic pump, and the circulating pump 41 is a variable pneumatic pump. By changing the flow rate of the circulating liquid, the reaction of the flexible nozzle 44 spraying the fluid changes, so that the running path and speed of the flexible suction tube 45 and the flexible nozzle 44 produce more variable randomness; the use of a pneumatic pump has good safety when filtering flammable and explosive liquids.

[0067] Furthermore, a liquid level sensor 22 is provided on the barrel cover 20, and the liquid level sensor 22 is electrically connected to the controller;

[0068] Furthermore, the liquid level sensor 22 is provided with an upper liquid level probe and a lower liquid level probe, the lower liquid level probe is located above the topmost through hole of the filter screen 30, and the upper liquid level probe is located between the upper liquid level probe and the top of the barrel cover 20. The upper liquid level probe and the lower liquid level probe provided on the liquid level sensor 22 are used to keep the liquid to be filtered at a suitable liquid level.

[0069] Furthermore, a pressure sensor 23 is provided on the barrel cover 20, and the pressure sensor 23 is electrically connected to the controller. The controller determines whether the filter screen 30 is blocked by calculating the difference between the pressure sensor 23 and the pressure that can be generated by the liquid pump 60 during normal liquid extraction and filtration. If blocked, the controller sends a signal to prompt the operator to clean or replace the filter screen 30.

[0070] Furthermore, the barrel body 10 and the barrel cover 20 are fixed by detachable bolts, and a sealing ring 50 is provided between the barrel body 10 and the barrel cover 20.

[0071] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the patent claims of the present invention.

Claims

1. A liquid filtering device, characterized in that: It comprises a barrel body (10) and a barrel cover (20) detachably connected to the barrel body (10), wherein the barrel body (10) and the barrel cover (20) form a hollow cavity; A liquid inlet pipe (21) is arranged above the barrel cover (20), a liquid outlet pipe (11) is arranged below the barrel body (10), and a detachable filter screen (30) is arranged between the liquid inlet pipe (21) and the liquid outlet pipe (11); The filter screen (30) divides the hollow cavity formed by the barrel body (10) and the barrel cover (20) into a to-be-filtered cavity near the liquid inlet pipe (21) for accommodating the liquid to be filtered and a filtered cavity near the liquid outlet pipe (11) for accommodating the filtered liquid; The filter (30) is used to filter specific substances in the liquid to be filtered; A stirring and filtering assembly (40) is arranged in the cavity to be filtered; The liquid outlet pipe (11) is provided with a liquid pump (60); The stirring and filtering assembly (40) comprises a circulation pump (41) and a guide rod (42); a circulation liquid suction pipe (421) and a circulation liquid spray pipe (422) are arranged inside the guide rod (42); one end of the circulation liquid suction pipe (421) and the circulation liquid spray pipe (422) are respectively connected to the inlet and outlet of the circulation pump (41); the other end of the circulation liquid suction pipe (421) and the circulation liquid spray pipe (422) are respectively connected to one end of a flexible suction pipe (45) and a flexible spray pipe (44); the other end of the flexible suction pipe (45) and the flexible spray pipe (44) are in a free state; The stirring and filtering assembly (40) includes a second filter (46) disposed between the circulating liquid suction pipe (421) and the circulating liquid spray pipe (422) and located outside the barrel cover (20); The circulation pump (41) and the liquid extraction pump (60) are electrically connected to the controller respectively; A rotating sleeve (43) which can rotate and / or slide along the axis of the guide rod (42) is sleeved on one end of the guide rod (42) away from the circulation pump (41); a liquid suction chamber (431) and a liquid spray chamber (432) which are divided by the sleeve surface of the guide rod (42) are arranged inside the rotating sleeve (43); the liquid suction chamber (431) and the liquid spray chamber (432) are communicated with the circulation liquid suction pipe (421) and the circulation liquid spray pipe (422) respectively; a flexible suction pipe (45) and a flexible spray pipe (44) are respectively arranged on the side walls of the liquid suction chamber (431) and the liquid spray chamber (432); one end of the flexible suction pipe (45) and the flexible spray pipe (44) are respectively communicated with the liquid suction chamber (431) and the liquid spray chamber (432); the other ends of the flexible suction pipe (45) and the flexible spray pipe (44) are in a free state.

2. The liquid filtering device according to claim 1, characterized in that: An upper limit block (423) and a lower limit block (424) are respectively provided at both ends of the rotating sleeve (43) for limiting the liquid suction chamber (431) and the liquid spray chamber (432) from being disconnected from the circulating liquid suction pipe (421) and the circulating liquid spray pipe (422).

3. The liquid filtering device according to claim 1, characterized in that: The guide rod (42) is a rigid rod-shaped structure, and the flexible suction pipe (45) and the flexible nozzle (44) are both flexible hoses with a certain elasticity; the flexible suction pipe (45) has a sufficient length and its free end keeps in contact with the filter (30) under the action of its own elasticity, and the length of the flexible nozzle (44) is such that its free end is not long enough to contact the filter (30) during movement; the flexible suction pipe (45) is provided in two or more quantities.

4. The liquid filtering device according to claim 1, characterized in that: The inlet end of the flexible straw (45) is provided with a straw head (451), and the straw head (451) is provided with two or more liquid suction holes connected to the inlet end of the flexible straw (45).

5. The liquid filtering device according to claim 4, characterized in that: The pipette head (451) is a spherical structure, and a weight cavity for adjusting the weight of the pipette head (451) is arranged inside the pipette head (451). By filling the weight cavity with a substance having a different density from that of the pipette head (451), the pipette head (451) is kept suspended in the liquid to be filtered.

6. The liquid filtering device according to claim 1, characterized in that: The filter screen (30) and the second filter (46) are any one or a combination of flexible filter materials, rigid filter materials and loose filter materials.

7. The liquid filtering device according to claim 1, characterized in that: The side wall of the liquid spraying chamber (432) is provided with a directional nozzle (433) for rotating the rotating sleeve (43).

8. The liquid filtering device according to claim 1, characterized in that: The liquid extraction pump (60) is a pneumatic pump, and the circulation pump (41) is a variable-volume pneumatic pump.

9. The liquid filtering device according to claim 1, characterized in that: The filter screen (30) is provided with a filter screen retaining ring (31), and the filter screen retaining ring (31) is detachably fixed between the barrel body (10) and the barrel cover (20); The barrel cover (20) is provided with a liquid level sensor (22), the liquid level sensor (22) is electrically connected to the controller, and the liquid level sensor (22) is provided with an upper liquid level probe and a lower liquid level probe, the lower liquid level probe is located above the topmost through hole of the filter screen (30), and the upper liquid level probe is located between the upper liquid level probe and the top of the barrel cover (20); The barrel cover (20) is provided with a pressure sensor (23), and the pressure sensor (23) is electrically connected to the controller; The barrel body (10) and the barrel cover (20) are fixed by means of detachable bolts, and a sealing ring (50) is arranged between the barrel body (10) and the barrel cover (20).

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