A leak-proof high-precision gear flowmeter cavity and flowmeter

Abstract

The present invention discloses a leak-proof, high-precision gear flowmeter cavity and flowmeter, belonging to the technical field of gear flowmeters. The cavity comprises a cavity body, a gear groove, a stop groove, a rocker arm, a reset mechanism, a baffle plate, a baffle plate, and a flowmeter body. The cavity body is disposed within the flowmeter body, the gear groove is disposed at the center of the cavity body, the rocker arm is located at the center of the stop groove, one end of the rocker arm abuts the inner wall of the stop groove, the reset mechanism is located at the rocker arm, the baffle plate is mounted on the right side of the cavity body, and the baffle plate is located between the rocker arm and the baffle plate. The rocker arm deflects under the rotation of the gear, restricting the flow of fluid entering the gear groove. The deflection of the rocker arm drives the baffle plate to extend, and the baffle plate restricts the flow of fluid exiting the gear groove. The present invention improves the accuracy of fluid average velocity and instantaneous velocity detection by limiting the diameter of the inlet and outlet flow rates.

Description

Technical Field

[0001] The present invention relates to the technical field of gear flowmeters, in particular to a leakage-proof high-precision gear flowmeter cavity and a flowmeter. Background Art

[0002] The Mitsubishi Hitachi pickling mill's support roll lubrication system utilizes centralized thin oil lubrication. One support roll lubrication station supplies five support rolls, with each support roll having four oiling points, totaling 20 user points. Oil pressure and temperature measurements are installed at each measuring point. However, due to centralized lubrication, the oil flow distribution at each lubrication point is erratic. Under backpressure, pressure increases, reducing or even eliminating oil flow. Furthermore, the reduced oil flow causes temperature measurements to measure the temperature of the stationary lubricant within the pipeline, failing to accurately reflect the actual lubrication condition at each lubrication point. This has led to numerous major equipment failures caused by poor lubrication of the support roll bearings. Therefore, a device that can directly measure the return oil flow rate of the support roll lubrication is urgently needed. A gear flowmeter is a device used to measure the flow of liquids or gases by measuring the volume change of the liquid or gas flowing through the gear cavity to estimate flow rate. The basic principle of a gear flowmeter is to use a pair of meshing gears to force fluid through the gear cavity and discharge it as the gears rotate. The gear speed is then used to measure the instantaneous and average flow rates of the fluid at that location.

[0003] When testing petroleum or petroleum derivatives, the liquid flows through the gears from the inlet, and the liquid exerts force on the gears, causing the gears to start rotating. By measuring the gear speed and the outflow volume per unit time, the instantaneous speed of the fluid can be obtained, and by measuring the number of revolutions of the gears within a certain period of time, the average speed of the fluid can be obtained. However, when the gears rotate, friction with the inner wall of the cavity cannot be generated, otherwise it will cause wear to the gears and the inside of the cavity. Therefore, there will be a certain gap between the gears and the inner wall of the cavity. Under the influence of this gap, the fluid will flow along the gap to the outlet. At this time, the amount flowing out of the outlet is not the same as the amount flowing through the gears, so The speed and number of gear rotations are not equivalent to the accurate values ​​required for flow measurement at that location. Under the same flow rate, the gears in a gear flowmeter with a large gap between the gears and the inner wall of the cavity rotate fewer times, affecting the average flow accuracy of the fluid detection. At the same time, a portion of the fluid bypasses the gears and is not measured, resulting in the actual amount of fluid flowing through the gears being less than the total flow, thus affecting the accuracy of the instantaneous flow. Based on the actual situation on site, the actual oil flow rate of the lubricating oil for the rolling mill support rolls is relatively small, usually between 10-40L / min. Conventional gear flowmeters have large measurement errors and cannot accurately reflect the actual oil flow rate on site, leading to serious misjudgments. In addition, the flowmeter must be installed near the lubrication point. This location is inside the rolling mill, where the ambient temperature remains between 60℃ and 90℃ year-round. The equipment is constantly in an emulsion flushing and steam environment, which places special requirements on the measuring equipment.

[0004] In response to the above problems, solutions have been proposed in the prior art, such as the volumetric flowmeter disclosed in patent number CN1132002C. This method cuts the helical gear of the flowmeter at right angles to the axis and sets its cross-sectional tooth profile curve to be part of a trochoid curve. The curve is composed of a circular arc tooth profile and an involute tooth profile, which can compensate for the effect of the gap between the gear and the housing, thereby stably measuring the fluid. However, due to the existence of the gap, the actual amount of fluid flowing through the gear is always less than the total flow rate, which makes the measured data inaccurate. It can be seen that when measuring the flow rate of a liquid, in order to avoid wear between the gear and the inner wall of the flowmeter during rotation, a gap exists between the gear and the inner wall of the flowmeter, and the fluid will flow through the gap, thereby affecting the measurement accuracy of the fluid. Summary of the Invention

[0005] The purpose of the present invention is to provide a leakage-proof high-precision gear flowmeter cavity and flowmeter, which improves the accuracy of fluid average velocity and instantaneous velocity detection by limiting the diameter of the inlet flow and outlet flow, so as to solve the problem of fluid flowing through the gap between the gear and the inner wall of the flowmeter, thereby reducing the accuracy of fluid measurement.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A leak-proof high-precision gear flowmeter cavity, comprising a cavity body, a gear groove, a stop groove, a rocker arm, a reset mechanism, a blocking plate and a blocking mechanism, wherein the cavity body is opened inside the flowmeter, the gear groove is opened at the center of the cavity body, the stop groove is located on the left side of the cavity body, the rocker arm is located at the center of the stop groove, one end of the rocker arm is in contact with the inner wall of the stop groove, the reset mechanism is located at the rocker arm, the blocking plate is installed on the right side of the cavity body, and the blocking mechanism is located between the rocker arm and the blocking plate, the rocker arm deflects under the rotation of the gear, the rocker arm limits the fluid flow entering the gear groove, the deflection of the rocker arm drives the blocking mechanism to extend the blocking plate, and the blocking plate limits the fluid flow output from the gear groove.

[0008] Furthermore, the reset mechanism includes a fixed shaft and a torsion spring. The fixed shaft is installed in the flow-stop groove. The torsion spring is wound on the fixed shaft. The other end of the torsion spring is connected to the rocker arm. The rocker arm is made of flexible material. A sealing ring is installed between the rocker arm and the fixed shaft.

[0009] Furthermore, the blocking mechanism includes an active magnet, a slide groove, a partition, a slide rod, a driven magnet, a slot, a block and a return spring, the active magnet is installed at both ends of the rocker rod, the slide groove is opened on the cavity body, the partition is located between the rocker rod and the slide groove, the slide rod is installed in the slide groove, the driven magnet is located at the end of the slide rod close to the active magnet, the blocking plate is located at the right end of the slide groove, the slot is opened on the blocking plate, the block is installed on the slide rod, the adjacent surfaces of the slot and the block are wedge-shaped surfaces, and the return spring is installed between the blocking plate and the cavity body.

[0010] Furthermore, the rocker arm is divided into section a and section b from the fixed axis, and the length of section a is greater than the length of section b.

[0011] Furthermore, the cavity body is provided with a diversion inlet, the two diversion inlets are symmetrically arranged relative to the fluid inlet axis, and the diversion inlet is tangent to the gear groove.

[0012] Furthermore, a placement groove is provided on the blocking plate, and a protrusion is installed on the cavity body corresponding to the placement groove.

[0013] Furthermore, the blocking plate is connected to the cavity body by a sealed mortise and tenon joint, and the blocking plate is divided into a protruding end and a sliding end, and the length of the sliding end is greater than the length of the protruding end.

[0014] Furthermore, the axial cross-section of the protruding end relative to the gear groove is I-shaped, and the moving distance of the protruding end is equal to the gap value between the gear and the cavity body.

[0015] Furthermore, a rubber layer is installed on the inner wall of the flow-stop groove, and the rubber layer is a hollow structure.

[0016] The present invention provides another technical solution: a leakage-proof high-precision gear flowmeter, including a leakage-proof high-precision gear flowmeter cavity and a flowmeter body, wherein the cavity body is located inside the flowmeter body, and a driving gear and a driven gear are installed in the gear groove, and the driving gear is interference fit with section B.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The leakage-proof high-precision gear flowmeter cavity and flowmeter of the present invention form a fixed capacity by forming a rocker arm, gear, stop groove, and the inner wall of the cavity body, so that the fluid in the gap between the gear and the cavity body is blocked by the rocker arm, and the amount of fluid driven by the gear to rotate is equal to the volume between the gear tooth pitch, thereby controlling the total flow rate of the fluid flowing out per unit time to be equal to the flow rate flowing through the gear, thereby ensuring that the rotation speed and number of rotations of the gear do not change, thereby improving the accuracy of the average flow rate.

[0019] 2. The leak-proof high-precision gear flowmeter cavity and flowmeter of the present invention control the blocking mechanism through the rocker arm, and then control the blocking plate to limit the flow at the outlet of the flowmeter, so as to achieve the flow rate per unit time being equal to the flow rate flowing out of the gear gap, and thus achieve the outflow amount being the same as the number of revolutions of the gear, thereby achieving the accuracy of the instantaneous flow rate.

[0020] 3. The leakage-proof high-precision gear flowmeter cavity and flowmeter of the present invention, by setting a reset spring, can achieve that when the fluid is blocked, the gear stops rotating. At this time, the rocker arm is reset by the torsion spring, driving the active magnet to swing, and the active magnet drives the driven magnet to reset, and then the blocking plate is reset under the action of the reset spring, thereby expanding the gap between the gear and the inner wall, thereby avoiding blockage of the gear flowmeter. On the one hand, it limits the flow of the fluid to prevent the fluid from flowing out of the gap between the gear and the inner wall of the cavity body; on the other hand, it also expands the cavity for fluid circulation when the fluid is blocked, thereby unblocking the water inlet and outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the flow meter body of the present invention;

[0022] Figure 2 is a schematic diagram of the cavity body of the present invention;

[0023] Figure 3 is a schematic diagram of the reset mechanism of the present invention;

[0024] Figure 4 is a schematic diagram of the blocking mechanism of the present invention;

[0025] Figure 5 is a schematic diagram of the rubber layer and the protrusions of the present invention;

[0026] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0027] Figure 7 This is a schematic diagram of the I-shaped portion of the protrusion of the present invention;

[0028] Figure 8 It is a schematic diagram of fluid flow of the present invention.

[0029] In the figure: 1. Cavity body; 11. Diverter inlet; 2. Gear groove; 3. Stop groove; 31. Rubber layer; 4. Rocker arm; 41. Section a; 42. Section b; 5. Reset mechanism; 51. Fixed shaft; 52. Torsion spring; 53. Sealing ring; 6. Blocking plate; 61. Mounting groove; 62. Bump; 63. Extending end; 631. I-shaped; 64. Sliding end; 7. Blocking mechanism; 71. Active magnet; 72. Slide groove; 73. Partition; 74. Slide rod; 75. Driven magnet; 76. Slot; 77. Block; 78. Reset spring; 8. Flowmeter body; 81. Active gear; 82. Driven gear. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 2The embodiment of the present invention provides a leakage-proof high-precision gear flowmeter cavity, which includes a cavity body 1, a gear groove 2, a stop groove 3, a rocker arm 4, a reset mechanism 5, a blocking plate 6 and a blocking mechanism 7, wherein the cavity body 1 is opened inside the flowmeter, the gear groove 2 is opened at the center of the cavity body 1, the gear groove 2 is used to place two circular gears, and the two circular gears are meshed with each other. The stop groove 3 is located on the left side of the cavity body 1, the rocker arm 4 is located at the center of the stop groove 3, one end of the rocker arm 4 is attached to the inner wall of the stop groove 3, and the edge of the rocker arm 4 and the inner wall of the stop groove 3 always form a sealed state, thereby preventing the circulation of liquid, the reset mechanism 5 is located at the rocker arm 4, the reset mechanism 5 is used to realize the reset of the rocker arm 4, the blocking plate 6 is installed on the right side of the cavity body 1, and the blocking mechanism 7 is located between the rocker arm 4 and the blocking plate 6. The blocking mechanism 7 drives the blocking plate 6 to move under the action of the rocker arm 4, thereby realizing that when the gear rotates, the flow calibration can be realized. Measurement; the pendulum rod 4 deflects under the rotation of the gear, and the pendulum rod 4 limits the fluid flow entering the gear groove 2. The specific method is to form a fixed capacity with the gear, the stop groove 3, and the inner wall of the cavity body 1, so that the fluid in the gap between the gear and the cavity body 1 is blocked by the pendulum rod 4, and the amount of fluid driven by the gear to rotate is equal to the volume between the gear tooth pitch, thereby controlling the total flow rate of the fluid flowing out per unit time to be equal to the flow rate flowing through the gear, thereby making the rotation speed and the number of rotations of the gear unchanged, thereby improving the accuracy of the average flow rate; the deflection of the pendulum rod 4 drives the blocking mechanism 7 to extend the blocking plate 6, and the blocking plate 6 limits the fluid flow output from the gear groove 2. Specifically, the blocking plate 6 is used to limit the flow at the outlet of the flowmeter, thereby achieving the flow rate out per unit time to be equal to the flow rate out of the gear gap, thereby achieving the outflow amount to be the same as the number of rotations of the gear, thereby achieving the accuracy of the instantaneous flow rate.

[0032] In the prior art, the flow difference between the gear and the cavity gap is reduced by flow calculation, but the flow detection is timely, and it takes a certain amount of time to calculate the data. Secondly, the instantaneous speed of the flow cannot be equated with the specific value of the detection, because the amount flowing through the gap per unit time is not necessarily the same, and the retention of the fluid after the previous measurement is completed must also be considered, which affects the accuracy of the measurement. The present invention sets a rocker 4 at the inlet, thereby realizing the flow flowing through the gear plus the total flow of the fluid in the stop groove 3, which is equivalent to the flow value of the fluid flowing through the inlet, thereby improving the accuracy of the average flow detection, and the rocker 4 synchronously controls the blocking plate 6 to limit the flow at the outlet, thereby making the unit flow at the outlet equal to the flow flowing through the gear per unit time, thereby improving the accuracy of the instantaneous flow detection.

[0033] like Figure 3As shown, the reset mechanism 5 in the above embodiment includes a fixed shaft 51 and a torsion spring 52. The fixed shaft 51 is installed in the stop groove 3, and the torsion spring 52 is wound on the fixed shaft 51. A sealing ring 53 is installed between the rocker arm 4 and the fixed shaft 51, which can play a good sealing role between the rocker arm 4 and the gear, and between the rocker arm 4 and the stop groove 3; the other end of the torsion spring 52 is connected to the rocker arm 4. The rocker arm 4 is made of flexible material. Here, the torsion spring 52 can only realize one-way rotation, can be folded in the positive direction, but can be limited in the reverse direction. On the one hand, it prevents the rocker arm 4 from shaking, so that the rocker arm 4 will not be reset by inertia after being pushed by the gear, and then it will be tightly pressed against the gear, and then stuck in the gear gap to affect the rotation of the gear. On the other hand, it can drive the rocker arm 4 to always contact the gear under the rotation of the gear, so as to avoid the rocker arm 4 having too much inertia, so that the rocker arm 4 will not recover after the previous gear tooth rotates, and then there will be a gap between the rocker arm 4 and the gear to affect the accuracy of detection.

[0034] like Figure 4 As shown, the blocking mechanism 7 in the above embodiment includes an active magnet 71, a slide groove 72, a partition 73, a slide rod 74, a driven magnet 75, a slot 76, a block 77 and a return spring 78. The active magnet 71 is installed at both ends of the rocker rod 4, the slide groove 72 is opened on the cavity body 1, the partition 73 is located between the rocker rod 4 and the slide groove 72, the slide rod 74 is installed in the slide groove 72, the driven magnet 75 is located at the end of the slide rod 74 close to the active magnet 71, the driven magnet 75 is located at the end of the slide rod 74, and the driven magnet 75 is affected by the active magnet 71 to move. The blocking plate 6 is located at the right end of the slide groove 72, the slot 76 is opened at the bottom of the blocking plate 6, and the block 77 is installed at the bottom of the slide rod 74. The adjacent surfaces of the slot 76 and the block 77 are wedge-shaped surfaces. The slot 76 and the block 77 cooperate with each other to realize that when the block 77 moves in the slot 76, the slide rod 74 It drives the blocking plate 6 to move left and right. When the blocking plate 6 moves to the left, the blocking plate 6 can block the circulating liquid to a certain extent. At the same time, the blocking plate 6 makes the gap between the gear at the liquid outlet and the inner wall of the cavity body 1 smaller, because the blocking plate 6 extends the inner wall of the cavity inward, thereby reducing the flow at the outlet affected by the gap, thereby improving the accuracy of the instantaneous flow measurement of the fluid. Among them, the reset spring 78 is installed between the blocking plate 6 and the cavity body 1. The reset spring 78 is used to reset the blocking plate 6, thereby realizing that the gear stops rotating when the fluid is blocked. At this time, the rocker arm 4 is reset by the torsion spring 52, driving the active magnet 71 to swing, and the active magnet 71 drives the driven magnet 75 to reset, and then the blocking plate 6 is reset under the action of the reset spring 78, thereby expanding the gap between the gear and the inner wall, thereby avoiding blockage of the gear flowmeter.

[0035] like Figure 3-4As shown, the rocker arm 4 in this embodiment is divided into a section 41 and a section 42 from the fixed axis 51. The length of section 41 is greater than the length of section 42. The length of section 41 is equal to the radius of the entire circle of the stop groove 3. Therefore, during the rotation of the rocker arm 4, section 41 is always in contact with the inner wall of the stop groove 3, thereby forming a sealed chamber to avoid a gap between the rocker arm 4 and the stop groove 3, which results in the flow rate of the liquid outflow being not equal to the flow rate flowing through the gear plus the flow rate flowing through the stop groove 3. Through the arrangement of the stop groove 3 and the rocker arm 4, the gear and the cavity that were originally unable to be sealed are sealed. A gap is formed between the inner walls through the rocker arm 4 and the stop groove 3, so that the overall incoming flow will not change due to the gap, thereby improving the accuracy of measuring the average flow. Section b 42 needs to engage with the gear. In order to prevent the gear from driving section b 42 to contact the inner wall of the stop groove 3 when the gear rotates, section b 42 needs to be smaller than the radius of the stop groove 3, so that the circle where the stop groove 3 is located intersects with the circle where the gear is located. The rotation of the gear will not drive section b 42 to cross above the horizontal line, thereby preventing the rocker arm 4 from rotating under the action of the gear, thereby affecting the sealing of the rocker arm 4 to the edge of the stop groove 3.

[0036] like Figure 5-6 As shown, a diversion inlet 11 is provided on the cavity body 1 in this embodiment, and the two-way diversion inlet 11 is symmetrically arranged relative to the fluid inlet axis, and the diversion inlet 11 is tangent to the gear groove 2. By setting the two-way diversion inlet 11, on the one hand, it is possible to better drive the gear to rotate, thereby enhancing the detection range of the gear flowmeter, and on the other hand, the fluid can directly reach the stop groove 3, and then under the action of the rocker arm 4, it can control the overall flow entering the gear flowmeter, avoiding part of the flow first entering the gear flowmeter through the gap between the gear and the inner wall of the cavity body 1, thereby affecting the detection accuracy of the flowmeter for the average flow.

[0037] like Figure 6-7 As shown, a seating groove 61 is provided on the baffle plate 6 in this embodiment, and a protrusion 62 is installed at the position of the cavity body 1 corresponding to the seating groove 61. The seating groove 61 is used to collect some impurities in the fluid and change the flow uniformity of the fluid. The balance of the rotating fluid is destroyed by the recessed design. After the fluid balance is destroyed, the fluid at this position becomes anisotropic, and the impact force of the liquid on the baffle plate 6 is reduced. On the one hand, the protrusion 62 is just engaged with the seating groove 61 to avoid fluid leakage. On the other hand, it can squeeze out the impurities in the seating groove 61, thereby avoiding too much accumulation of impurities on the baffle plate 6, which in turn affects the normal use of the gear flowmeter.

[0038] In the above embodiment, the blocking plate 6 and the cavity body 1 are connected by a sealed mortise and tenon joint, thereby preventing the blocking plate 6 from bending and deforming under the fluid, thereby affecting the overall stability; at the same time, the mortise and tenon structure has a strong sealing performance, and the blocking plate 6 is divided into a protruding end 63 and a sliding end 64. The length of the sliding end 64 is greater than the length of the protruding end 63, thereby enabling the protruding end 63 located in the fluid to better resist the fluid. The axial section of the protruding end 63 relative to the gear groove 2 is an I-shaped 631. The I-shaped 631 structure can improve the bending resistance. Under the action of the moment of inertia, the strength of the protruding end 63 is further improved. Improvement, the moving distance of the protruding end 63 is equal to the gap value between the gear and the cavity body 1, so that the edge of the gear is fitted with the end of the protruding end 63, and on the one hand, the flexible protruding end 63 can reduce the collision of the gear teeth, and at the same time, the protruding end 63 can control the flow of the water outlet, and control it so that only the flow rate flowing through the gear can flow out from the water outlet, thereby avoiding the gap between the gear and the inner wall of the cavity so that the fluid flowing out per unit time is greater than the fluid flowing through the gear per unit time, thereby causing the problem of inaccurate instantaneous flow detection of the fluid, thereby improving the accuracy of the gear flowmeter.

[0039] In the above embodiment, the inner wall of the flow-stop groove 3 of the present invention is installed with a rubber layer 31. The rubber layer 31 has a hollow structure. On the one hand, the rubber layer 31 reduces the wear of the swing rod 4 during the sliding process. On the other hand, the rubber layer 31 can be compressed when the fluid flow rate is too fast and the pressure increases, thereby protecting the gear flowmeter body 8. At the same time, the rubber layer 31 can also deform under the impact of the fluid, thereby fixing the position of the swing rod 4 and reducing the sliding of the swing rod 4 due to inertia when the gear rotates.

[0040] In order to further better explain the application of the above embodiment, the present invention also provides a leakage-proof high-precision gear flow meter, such as Figure 1-8 As shown, it includes the flowmeter cavity mentioned in the above embodiment and also includes a flowmeter body 8. The cavity body 1 is located inside the flowmeter body 8. A driving gear 81 and a driven gear 82 are installed in the gear groove 2. The driving gear 81 and the b section 42 are interference fit. During the reciprocating process, the pendulum rod 4 can swing to the extreme position, and then under the rotation of the gear, the pendulum rod 4 is always tangent to the circle where the outer teeth of the gear are located, thereby improving the working efficiency of the pendulum rod 4 and thus improving the detection efficiency of the gear flowmeter.

[0041] When a gear flowmeter is needed to detect the flow rate of a fluid, the flowmeter body 8 is installed between the pipes, the valve of the pipe is started, and the fluid enters the cavity body 1. At this time, it enters the gear groove 2 through the diverter inlet 11, and drives the driving gear 81 to rotate when passing through the driving gear 81. The synchronous driving gear 81 drives the driven gear 82 to mesh and rotate, and the flow flows out from the outlet under the rotation of the gear. The flow rate of the fluid can be known according to the rotation speed of the gear; in the process of the diverter inlet 11 flowing to the gear groove 2, the driving gear 81 and the driven gear 82 drive the rocker rod 4 in the stop groove 3 to rotate, and then drives the blocking plate 6 to extend through the blocking mechanism 7, thereby limiting the flow rate of the fluid at the inlet and outlet;

[0042] The specific method is that the driving gear 81 and the driven gear 82 drive the swing rod 4 to rotate, and the swing rod 4 rotates around the fixed axis 51, and the section a 41 always fits the flow-stopping groove 3, so that the flow rate flowing through the gear is equal to the flow rate of the fluid minus the flow rate at the flow-stopping groove 3. At the same time, during the swing process, the swing rod 4 will use the active magnet 71 to drive the driven magnet 75, and the driven magnet 75 will drive the slide bar 74 to slide in the slide groove 72. The slide bar 74 will engage the slot 76 on the blocking plate 6 through the block 77, driving the blocking plate 6 to extend, so that the blocking plate 6 can limit the flow rate flowing out of the water outlet per unit time;

[0043] When blockage occurs, the fluid cannot flow, the gear stops rotating, and the torsion spring 52 on the fixed shaft 51 drives the rocker arm 4 to reset, and then drives the driven magnet 75 to reset through the active magnet 71, and then drives the slide rod 74 to reset. The blocking plate 6 loses the restriction of the block 77 and will reset under the action of the reset spring 78, and the space at the inlet and outlet increases, that is, a gap appears between the gear and the inner wall of the cavity body 1, thereby achieving spontaneous liquid dredging.

[0044] In summary: The present invention provides a leakage-proof high-precision gear flowmeter cavity and a flowmeter.

[0045] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A leak-proof high-precision gear flowmeter cavity, characterized in that: The flow meter comprises a cavity body (1), a gear groove (2), a flow stop groove (3), a swing rod (4), a reset mechanism (5), a blocking plate (6) and a blocking mechanism (7), wherein the cavity body (1) is provided inside the flow meter, the gear groove (2) is provided at the center of the cavity body (1), the flow stop groove (3) is located on the left side of the cavity body (1), the swing rod (4) is rotatably mounted at the center of the flow stop groove (3), one end of the swing rod (4) is in contact with the inner wall of the flow stop groove (3), and the other end of the swing rod (4) is in contact with the inner wall of the flow stop groove (3). One end is engaged with the gear; the reset mechanism (5) is located at the rocker arm (4), the blocking plate (6) is installed on the right side of the cavity body (1), and the blocking mechanism (7) is located between the rocker arm (4) and the blocking plate (6). The rocker arm (4) deflects under the rotation of the gear, and the rocker arm (4) limits the flow of fluid entering the gear groove (2). The deflection of the rocker arm (4) drives the blocking mechanism (7) to extend the blocking plate (6), and the blocking plate (6) limits the flow of fluid output from the gear groove (2).

2. The leak-proof high-precision gear flowmeter cavity according to claim 1, characterized in that: The reset mechanism (5) comprises a fixed shaft (51) and a torsion spring (52), wherein the fixed shaft (51) is mounted in the stop groove (3), the torsion spring (52) is wound around the fixed shaft (51), and the other end of the torsion spring (52) is connected to a rocker (4), the rocker (4) is made of a flexible material, and a sealing ring (53) is mounted between the rocker (4) and the fixed shaft (51).

3. The leak-proof high-precision gear flowmeter cavity according to claim 1, characterized in that: The blocking mechanism (7) includes an active magnet (71), a slide groove (72), a partition (73), a slide bar (74), a driven magnet (75), a slot (76), a block (77) and a return spring (78), wherein the active magnet (71) is mounted at both ends of the rocker (4), the slide groove (72) is opened on the cavity body (1), the partition (73) is located between the rocker (4) and the slide groove (72), the slide bar (74) is mounted in the slide groove (72), the driven magnet (75) is located at one end of the slide bar (74) close to the active magnet (71), the blocking plate (6) is located at the right end of the slide groove (72), the slot (76) is opened on the blocking plate (6), the block (77) is mounted on the slide bar (74), the adjacent surfaces of the slot (76) and the block (77) are wedge-shaped surfaces, and the return spring (78) is mounted between the blocking plate (6) and the cavity body (1).

4. The leak-proof high-precision gear flowmeter cavity according to claim 2, characterized in that: The rocker (4) is divided into a section a (41) and a section b (42) from the fixed axis (51), and the length of the section a (41) is greater than the length of the section b (42).

5. The leak-proof high-precision gear flowmeter cavity according to claim 1, characterized in that: The cavity body (1) is provided with a diversion inlet (11), and the two diversion inlets (11) are symmetrically arranged relative to the fluid inlet axis, and the diversion inlets (11) are tangent to the gear groove (2).

6. The leak-proof high-precision gear flowmeter cavity according to claim 1, characterized in that: The blocking plate (6) is provided with a placement groove (61), and a protrusion (62) is installed on the cavity body (1) at a position corresponding to the placement groove (61).

7. The leak-proof high-precision gear flowmeter cavity according to claim 6, characterized in that: The blocking plate (6) is connected to the cavity body (1) by a sealed mortise and tenon joint. The blocking plate (6) is divided into a protruding end (63) and a sliding end (64). The length of the sliding end (64) is greater than the length of the protruding end (63).

8. The leak-proof high-precision gear flowmeter cavity according to claim 7, characterized in that: The axial cross-section of the protruding end (63) relative to the gear groove (2) is an I-shape (631), and the moving distance of the protruding end (63) is equal to the clearance value between the gear and the cavity body (1).

9. The leak-proof high-precision gear flowmeter cavity according to claim 1, characterized in that: A rubber layer (31) is installed on the inner wall of the flow-stop groove (3), and the rubber layer (31) is a hollow structure.

10. A leak-proof high-precision gear flowmeter, comprising the leak-proof high-precision gear flowmeter cavity according to any one of claims 1 to 9, characterized in that: It also includes a flow meter body (8), wherein the cavity body (1) is located inside the flow meter body (8), a driving gear (81) and a driven gear (82) are installed in the gear groove (2), and the driving gear (81) is interference-fitted with the b section (42).

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