A liquid flow meter for detecting tiny liquid flow

Abstract

The invention discloses a liquid flow meter for detecting tiny liquid flow, which relates to the technical field of liquid flow meters, and comprises a conical tube body, wherein the conical tube body is provided with upper and lower conical grooves, a float is provided in the conical groove provided in the conical tube body, a filter housing is provided at the lower end of the conical tube body, a through hole is provided on the conical tube body, a fixed channel block is fixedly installed on the conical tube body, a fitting block is slidably installed in the fixed channel block, a second mounting baffle is slidably installed in the fixed channel block, and a connecting rod is fixedly installed at the side end of the second mounting baffle. The invention uses the filter housing provided at the lower end of the conical tube body and the filtering structure inside the filter housing, so that the device can effectively prevent particulate impurities from entering the conical tube body when detecting the fluid, ensure that the fluid entering the conical tube body is clean, protect the float inside the conical tube body to work normally, and effectively improve the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flowmeters, and in particular to a liquid flowmeter for detecting tiny liquid flow. Background Art

[0002] Liquid flow meter is a precision instrument used to measure the flow of liquid, gas and steam in a closed pipe. It is manufactured according to the Karman vortex principle, has no moving parts and reliable operation, and is widely used in metering management and process control in industries such as textile printing and dyeing, petroleum, chemical industry, metallurgy and pharmaceuticals, thermal power, papermaking and fire protection. Float flow meter is one of them, and float flow meter can be used to detect the flow of tiny liquids;

[0003] The current float flowmeter has been found to have at least the following technical problems:

[0004] First, the current float flowmeter does not have a filtering mechanism at its input end, so when the input fluid contains particulate impurities, these particulate impurities will enter the interior of the conical tube body, causing wear on the float inside, thereby affecting the normal operation of the float.

[0005] Second, when the float flowmeter needs to be cleaned, the float flowmeter must be disassembled from the pipeline as a whole and then disassembled through cumbersome steps before the float can be cleaned, which greatly reduces the efficiency of float cleaning. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a liquid flow meter for detecting tiny liquid flow rates to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A liquid flow meter for detecting a tiny liquid flow rate comprises a conical tube body, wherein an upper and lower conical grooves are provided inside the conical tube body, a float is provided in the conical groove provided in the conical tube body, a filter housing is provided at the lower end of the conical tube body, a through hole is provided on the conical tube body, a fixed channel block is fixedly installed on the conical tube body, a fitting block is slidably installed in the fixed channel block, a second mounting baffle is slidably installed in the fixed channel block, a connecting rod is fixedly installed on the side end of the second mounting baffle, a second rack is fixedly installed on the lower end of the connecting rod, a rotating shaft is rotatably installed in the filter housing, a collecting mesh plate is provided on the rotating shaft, a first gear is fixedly installed on the right end of the rotating shaft, the first gear is meshed with the second rack, a second gear is fixedly installed on the left end of the rotating shaft, a filter screen plate is slidably installed in the flow groove provided in the filter housing, a locking cover is fixedly installed on the filter screen plate, a first rack is fixedly installed on the locking cover, and the first rack is meshed with the second gear.

[0009] Preferably, a flow groove is provided in the filter housing, and the flow groove provided in the filter housing is communicated with the interior of the conical tube body.

[0010] Preferably: the fixed channel block is connected to the through hole opened in the conical tube body, a disassembly screw is slidably installed through the upper end of the fixed channel block, a first mounting baffle is slidably installed on the upper circumferential surface of the disassembly screw, the first mounting baffle is slidably installed in the fixed channel block, the first mounting baffle is located at the upper end of the second mounting baffle, and the fitting block is arranged in the through hole opened in the conical tube body through a sealing gasket.

[0011] Preferably, a magnet block is fixedly mounted on the circumferential surface of the rotating shaft, and the collecting screen plate is magnetically connected to the magnet block.

[0012] Preferably: a slide groove is provided on the filter housing, the first rack is movably installed in the slide groove provided in the filter housing, four locking screws are provided on the side end of the locking cover, and the locking cover is fixedly connected to the filter housing through the four locking screws.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention adopts a filter housing provided at the lower end of the conical tube body and a filtering structure inside the filter housing, so that when the device detects the fluid, it can effectively prevent particulate impurities from entering the conical tube body, ensure that the fluid entering the conical tube body is clean, protect the float inside the conical tube body to work normally, and effectively improve the measurement accuracy.

[0015] Second: The present invention provides a reversible collecting mesh plate inside the filter housing, so that when the fluid is being transported, the fluid can be filtered through the filter mesh plate, and then after the fluid transportation is completed, the collecting mesh plate can be flipped to the lower end of the filter mesh plate to collect the particulate impurities filtered out on the filter mesh plate, thereby preventing the particulate impurities from continuing to remain in the untransported fluid.

[0016] 3. The present invention opens a through hole at the side end of the tapered tube body, and then installs a fixed channel block, and fixes the fitting block by disassembling the screw, the first mounting baffle and the second mounting baffle, so that the float in the device can be quickly disassembled from the tapered tube body, and then it can be cleaned and maintained without disassembling the tapered tube body as a whole, eliminating the cumbersome disassembly steps, and greatly improving the efficiency of cleaning and maintenance of the float.

[0017] Fourth: The present invention sets a first rack at the side end of the locking cover, and then meshes the first rack with the second gear, so that the locking cover and the filter screen can be disassembled, the collecting screen can be turned over, and then the particulate impurities on the collecting screen can be cleaned, and the filter screen can be cleaned at the same time. It is not only simple in structure, but also simple in operation, which greatly improves the efficiency of cleaning the filter screen and the collecting screen.

[0018] Fifth: The present invention connects the collecting screen plate and the rotating shaft by means of a magnet block, so that when cleaning the collecting screen plate, the collecting screen plate can be taken out by simply pulling it upwards. The operation is very simple and effortless, and the operating efficiency can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0020] Figure 1 It is a structural diagram of the present invention as a whole;

[0021] Figure 2 It is a structural diagram of the filter housing of the present invention;

[0022] Figure 3 The structural diagram of the mesh plate for the present invention is collected;

[0023] Figure 4 is a structural diagram of the rotating shaft of the present invention;

[0024] Figure 5 It is a structural diagram of the conical tube body of the present invention;

[0025] Figure 6 It is a structural diagram of the float of the present invention;

[0026] Figure 7 This is a structural diagram of a block that matches the present invention;

[0027] Figure 8 It is a structural diagram of the second gear of the present invention.

[0028] Legend: 11. Locking cover; 12. Locking screw; 13. First rack; 14. Filter screen; 15. Filter housing; 16. Slide; 17. Flow channel; 21. Rotating shaft; 22. First gear; 23. Second rack; 24. Connecting rod; 25. Magnet block; 26. Collecting screen; 27. Second gear; 31. Conical tube; 32. Fixed channel block; 33. Disassembly screw; 34. First mounting baffle; 35. Second mounting baffle; 36. Float; 37. Through hole; 38. Fitting block. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, in order to solve the problems existing in the prior art, the present invention provides a liquid flow meter for detecting a small liquid flow rate, comprising a conical tube body 31, wherein the conical tube body 31 is provided with an upper and lower conical groove, wherein the conical groove of the conical tube body 31 is provided with a float 36, wherein the lower end of the conical tube body 31 is provided with a filter housing 15, wherein a through hole 37 is provided on the conical tube body 31, wherein a fixed channel block 32 is fixedly installed on the conical tube body 31, wherein a fitting block 38 is slidably installed in the fixed channel block 32, wherein a second mounting baffle 35 is slidably installed through the fixed channel block 32, wherein a connecting rod 24 is fixedly installed on the side end of the second mounting baffle 35, wherein a second rack 23 is fixedly installed on the lower end of the connecting rod 24, wherein a rotating shaft 21 is rotatably installed in the filter housing 15, wherein a collecting mesh plate 26 is provided on the rotating shaft 21, wherein a first gear 22 is fixedly installed on the right end of the rotating shaft 21, wherein the first gear 22 is meshed with the second rack 23, wherein a second gear 22 is fixedly installed on the left end of the rotating shaft 21 Gear 27, a filter screen plate 14 is slidably installed in the flow slot 17 opened in the filter housing 15, a locking cover 11 is fixedly installed on the filter screen plate 14, a first rack 13 is fixedly installed on the locking cover 11, and the first rack 13 is meshed with the second gear 27. When the device is used to detect a small liquid flow rate, the user installs the device in the middle of the measuring liquid pipeline. At this time, the liquid will flow upward from the lower end of the filter housing 15, and then pass through the conical tube body 31, and then pass through the float 36 inside the conical tube body 31 to complete the flow measurement (the specific measurement method is that when the fluid flows upward through the conical tube body 31, the float 36 moves upward, and at a certain position, the buoyancy of the float 36 and the gravity are balanced. At this time, the flow annular gap area between the float 36 and the conical tube body 31 remains constant, and the annular gap area is proportional to the rising height of the float 36, that is, a certain height of the float 36 in the float 36 represents the size of the flow rate).

[0031] A flow slot 17 is provided in the filter housing 15, and the flow slot 17 provided in the filter housing 15 is connected to the inside of the conical tube body 31, and the fixed channel block 32 is connected to the through hole 37 provided in the conical tube body 31, and a disassembly screw 33 is slidably installed on the upper end of the fixed channel block 32, and a first mounting baffle 34 is slidably installed on the upper circumferential surface of the disassembly screw 33, and the first mounting baffle 34 is slidably installed in the fixed channel block 32, and the first mounting baffle 34 is located at the upper end of the second mounting baffle 35, and the fitting block 38 is arranged in the through hole 37 provided in the conical tube body 31 through a sealing gasket. When the fluid passes through the filter housing 15, the filter provided in the filter housing 15 The mesh plate 14 can filter the fluid well and filter out some larger impurities in the fluid. When the device is used up, the device can be operated while the fluid is still being transported, so as to clean out the impurities in the fluid. The user rotates the disassembly screw 33, and the second mounting baffle 35 is threadedly connected with the disassembly screw 33, and the second mounting baffle 35 continues to move downward. Since the bottom of the fixed channel block 32 is hollow, the second mounting baffle 35 can continue to move downward. At this time, the second mounting baffle 35 drives the connecting rod 24 and the second rack 23 to move downward. Through the meshing of the second rack 23 and the first gear 22, When the first gear 22 rotates, the rotating shaft 21 also rotates. At this time, the rotating shaft 21 drives the collecting screen plate 26 to rotate through the magnet block 25. At this time, the collecting screen plate 26 rotates into the flow slot 17 provided in the filter housing 15. At this time, the delivery of the fluid can be stopped. The particulate impurities filtered by the filter screen plate 14 will remain at the lower end of the filter screen plate 14 due to the inertia of the water flow. Therefore, after the delivery of the fluid stops, these impurities will fall on the collecting screen plate 26, thereby collecting the impurities. The present invention uses the filter housing 15 provided at the lower end of the conical tube body 31 and the filtering structure inside it. The structure enables the device to effectively prevent particulate impurities from entering the conical tube body 31 when detecting the fluid, ensure that the fluid entering the conical tube body 31 is clean, protect the float 36 inside it to work normally, and effectively improve the measurement accuracy. The present invention provides a reversible collecting mesh plate 26 inside the filter housing 15, so that when the fluid is transported, the fluid can be filtered through the filter mesh plate 14, and then after the fluid transportation is completed, the collecting mesh plate 26 can be flipped to the lower end of the filter mesh plate 14 to collect the particulate impurities filtered on the filter mesh plate 14, thereby preventing the particulate impurities from continuing to remain in the untransported fluid.

[0032] A magnet block 25 is fixedly installed on the circumferential surface of the rotating shaft 21, and the collecting screen plate 26 is magnetically connected to the magnet block 25. A slide groove 16 is provided on the filter housing 15, and the first rack 13 is movably installed in the slide groove 16 provided in the filter housing 15. Four locking screws 12 are provided at the side end of the locking cover 11, and the locking cover 11 is fixedly connected to the filter housing 15 through the four locking screws 12. The first mounting baffle 34 at the upper end of the second mounting baffle 35 will fall when the second mounting baffle 35 falls. The user removes the disassembly screw 33 from the fixed channel block 32, and then the first mounting baffle 34 can be taken out. At this time, the matching block 38 can be removed from the conical tube body 31 using a tool. The float 36 in the conical tube body 31 can be removed from the through hole 37 opened in the conical tube body 31 after disassembly, and the user can take out the float 36 in the conical tube body 31 from the through hole 37 opened in the conical tube body 31 to clean and maintain its surface. The present invention opens a through hole 37 at the side end of the conical tube body 31, and then installs a fixed channel block 32, and fixes the fitting block 38 by disassembling the screw 33, the first mounting baffle 34 and the second mounting baffle 35, so that the float 36 in the device can be quickly removed from the conical tube body 31, and then cleaned and maintained, without disassembling the conical tube body 31 as a whole, eliminating the cumbersome disassembly steps, and greatly improving the efficiency of cleaning and maintenance of the float 36.

[0033] Then use a tool to disassemble the four locking screws 12, at which time the locking cover 11 is in a loosened state with the filter housing 15, and at this time, slightly turn the locking cover 11 to the left, the locking cover 11 will drive the first rack 13 to rotate, and the lower end of the first rack 13 will be in meshing state with the second gear 27, and then use the handle at the front end of the locking cover 11 to take the locking cover 11 out of the flow groove 17 opened in the filter housing 15, and when the first rack 13 drives the second gear 27 to rotate, the rotating shaft 21 and the collecting mesh plate 26 will return to their original positions, and the collecting mesh plate 26 will flip out the collected impurities, and then take out the locking cover 11 and the filter mesh plate 14, and clean the locking cover 11 and the filter mesh plate 14, The present invention sets a first rack 13 at the side end of the locking cover 11, and then meshes the first rack 13 with the second gear 27, so that when the locking cover 11 and the filter screen plate 14 are disassembled, the collecting screen plate 26 can be turned over, and then the particulate impurities on the collecting screen plate 26 can be cleaned, and the filter screen plate 14 can be cleaned at the same time. It is not only simple in structure but also simple in operation, which greatly improves the efficiency of cleaning the filter screen plate 14 and the collecting screen plate 26. The present invention magnetically connects the collecting screen plate 26 and the rotating shaft 21 through a magnet block 25, so that when cleaning the collecting screen plate 26, it only needs to be pulled up to take it out. The operation is very simple and effortless, which can effectively improve the operating efficiency.

[0034] Working principle:

[0035] In the first step, when the device is used to detect a small liquid flow rate, the user installs the device in the middle of the measuring liquid pipeline. At this time, the liquid will flow upward from the lower end of the filter housing 15, then pass through the conical tube body 31, and then pass through the float 36 inside the conical tube body 31 to complete the flow measurement (the specific measurement method is that when the fluid flows upward through the conical tube body 31, the float 36 moves upward, and at a certain position the buoyancy and gravity of the float 36 are balanced. At this time, the flow annular gap area between the float 36 and the conical tube body 31 remains constant, and the annular gap area is proportional to the rising height of the float 36, that is, a certain height of the float 36 in the float 36 represents the size of the flow rate).

[0036] In the second step, when the fluid passes through the filter housing 15, the filter screen 14 arranged in the filter housing 15 can filter the fluid well and filter out some larger impurities in the fluid. When the device is used up, the device can be operated while the fluid continues to be transported, so as to clean out the impurities in the fluid. The user rotates the disassembly screw 33. Through the threaded connection between the disassembly screw 33 and the second mounting baffle 35, the second mounting baffle 35 will continue to move downward. Since the bottom of the fixed channel block 32 is hollow, the second mounting baffle 35 can continue to move downward. At this time, the second mounting baffle 35 will drive the connecting rod 24 and the second rack 23 to move downward. Through the meshing of the second rack 23 and the first gear 22, the first gear 22 will rotate. When the first gear 22 rotates, the rotating shaft 21 also rotates. At this time, the rotating shaft 21 will drive the collecting screen 26 to rotate through the magnet block 25. At this time, the collecting screen 26 will rotate into the flow groove 17 opened in the filter housing 15. At this time, the delivery of the fluid can be stopped, and the particulate impurities filtered by the filter screen plate 14 will remain at the lower end of the filter screen plate 14 due to the inertia of the water flow. Therefore, after the fluid stops being delivered, these impurities will fall on the collecting screen plate 26, thereby collecting the impurities. The present invention uses the filter housing 15 set at the lower end of the conical tube body 31 and the filtering structure inside it, so that the device can effectively prevent particulate impurities from entering the conical tube body 31 when detecting the fluid, ensure that the fluid entering the conical tube body 31 is clean, and protect the float 36 inside it to work normally, effectively improving the measurement accuracy. The present invention uses the reversible collecting screen plate 26 set inside the filter housing 15, so that when the fluid is delivered, the fluid can be filtered through the filter screen plate 14, and then after the fluid delivery is completed, the collecting screen plate 26 can be flipped to the lower end of the filter screen plate 14 to collect the particulate impurities filtered on the filter screen plate 14, thereby preventing the particulate impurities from continuing to remain in the undelivered fluid.

[0037] In the third step, the first mounting baffle 34 at the upper end of the second mounting baffle 35 will fall down when the second mounting baffle 35 falls down. The user removes the disassembly screw 33 from the fixed channel block 32, and then the first mounting baffle 34 can be taken out. At this time, the fitting block 38 can be removed from the through hole 37 of the tapered tube body 31 using a tool. After disassembly, the user can take out the float 36 inside the tapered tube body 31 from the through hole 37 of the tapered tube body 31 and clean its surface. In order to improve the cleaning and maintenance of the device, the present invention opens a through hole 37 at the side end of the conical tube body 31, and then installs a fixed channel block 32, and fixes the fitting block 38 by disassembling the screw rod 33, the first mounting baffle plate 34 and the second mounting baffle plate 35, so that the float 36 in the device can be quickly disassembled from the conical tube body 31, and then it can be cleaned and maintained, without disassembling the conical tube body 31 as a whole, eliminating the cumbersome disassembly steps, and greatly improving the efficiency of cleaning and maintenance of the float 36.

[0038] The fourth step is to use a tool to disassemble the four locking screws 12. At this time, the locking cover 11 is in a loosened state with the filter housing 15. At this time, slightly turn the locking cover 11 to the left, and the locking cover 11 will drive the first rack 13 to rotate. The lower end of the first rack 13 will be in meshing state with the second gear 27 at this time. Then, the locking cover 11 is taken out from the flow groove 17 opened in the filter housing 15 through the handle at the front end of the locking cover 11. When the first rack 13 drives the second gear 27 to rotate, the rotating shaft 21 and the collecting mesh plate 26 will return to their original positions. At this time, the collecting mesh plate 26 will flip out the collected impurities, and then take out the locking cover 11 and the filter mesh plate 14, and clean the locking cover 11 and the filter mesh plate 14. In principle, the present invention sets a first rack 13 at the side end of the locking cover 11, and then meshes the first rack 13 with the second gear 27, so that when the locking cover 11 and the filter screen plate 14 are disassembled, the collecting screen plate 26 can be turned over, and then the particulate impurities on the collecting screen plate 26 can be cleaned, and the filter screen plate 14 can be cleaned at the same time. It is not only simple in structure but also simple in operation, which greatly improves the efficiency of cleaning the filter screen plate 14 and the collecting screen plate 26. The present invention magnetically connects the collecting screen plate 26 and the rotating shaft 21 through a magnet block 25, so that when cleaning the collecting screen plate 26, it only needs to be pulled up to take it out. The operation is very simple and effortless, which can effectively improve the operating efficiency.

[0039] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A liquid flow meter for detecting a small liquid flow, comprising a conical tube (31), wherein the conical tube (31) has upper and lower conical grooves formed therein, and a float (36) is provided in the conical groove formed in the conical tube (31), wherein: A filter housing (15) is provided at the lower end of the conical tube body (31); a through hole (37) is provided on the conical tube body (31); a fixed channel block (32) is fixedly mounted on the conical tube body (31); a fitting block (38) is slidably mounted in the fixed channel block (32); a second mounting baffle (35) is slidably mounted through the fixed channel block (32); a connecting rod (24) is fixedly mounted on the side end of the second mounting baffle (35); and a second rack (23) is fixedly mounted on the lower end of the connecting rod (24); The filter housing (15) is provided with a flow slot (17), a rotating shaft (21) is rotatably mounted in the filter housing (15), a collecting screen (26) is provided on the rotating shaft (21), a first gear (22) is fixedly mounted on the right end of the rotating shaft (21), the first gear (22) is meshed with a second rack (23), a second gear (27) is fixedly mounted on the left end of the rotating shaft (21), a filter screen (14) is slidably mounted in the flow slot (17) provided in the filter housing (15), a locking cover (11) is fixedly mounted on the filter screen (14), a first rack (13) is fixedly mounted on the locking cover (11), the first rack (13) is meshed with the second gear (27); A disassembly screw (33) is slidably mounted through the upper end of the fixed channel block (32); a first mounting baffle (34) is slidably mounted on the upper circumferential surface of the disassembly screw (33); the first mounting baffle (34) is slidably mounted in the fixed channel block (32); the first mounting baffle (34) is located at the upper end of the second mounting baffle (35); the fitting block (38) is arranged in a through hole (37) provided in the conical tube body (31) via a sealing gasket; and a magnet block (25) is fixedly mounted on the circumferential surface of the rotating shaft (21); The fluid passes through the filter housing (15), and the filter screen (14) arranged in the filter housing (15) can filter the fluid and filter out some larger impurities in the fluid. When the device is used, the impurities in the fluid can be cleaned out, and the disassembly screw (33) is rotated. Through the threaded connection between the disassembly screw (33) and the second mounting baffle (35), the second mounting baffle (35) will continue to move downward. The bottom of the fixed channel block (32) is hollow, so the second mounting baffle (35) continues to move downward, and the second mounting baffle (35) will drive the connecting rod (24) and the second rack (23) downward. The first gear (22) rotates through the meshing of the second rack (23) and the first gear (22). When the first gear (22) rotates, the rotating shaft (21) rotates. The rotating shaft (21) drives the collecting screen (26) to rotate through the magnet block (25). The collecting screen (26) rotates into the flow groove (17) provided in the filter housing (15). The conveying of the fluid stops. The particulate impurities filtered by the filter screen (14) are retained at the lower end of the filter screen (14) due to the inertia of the water flow. After the conveying of the fluid stops, the impurities fall on the collecting screen (26), thereby completing the collection of the impurities. The first mounting baffle (34) at the upper end of the second mounting baffle (35) will fall down when the second mounting baffle (35) falls down, the disassembly screw (33) is removed from the fixed channel block (32), the first mounting baffle (34) is taken out, and the fitting block (38) is disassembled from the through hole (37) opened in the conical tube body (31) using a tool. After disassembly, the float (36) inside the conical tube body (31) is taken out from the through hole (37) opened in the conical tube body (31), and its surface is cleaned and maintained.

2. A liquid flow meter for detecting a small liquid flow rate according to claim 1, characterized in that: The flow groove (17) provided in the filter housing (15) is communicated with the interior of the conical tube body (31).

3. A liquid flow meter for detecting a small liquid flow rate according to claim 2, characterized in that: The fixed channel block (32) is connected to a through hole (37) provided in the conical tube body (31).

4. A liquid flow meter for detecting a small liquid flow rate according to claim 3, characterized in that: The collecting screen plate (26) is magnetically connected to the magnet block (25).

5. A liquid flow meter for detecting a small liquid flow rate according to claim 4, characterized in that: The filter housing (15) is provided with a slide groove (16); The first rack (13) is movably mounted in a slide groove (16) provided in the filter housing (15).

6. A liquid flow meter for detecting a small liquid flow rate according to claim 5, characterized in that: Four locking screws (12) are provided at the side ends of the locking cover (11); The locking cover (11) is fixedly connected to the filter housing (15) via four locking screws (12).

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