Leakage-proof high-precision gear flowmeter cavity and flowmeter

Abstract

The invention discloses a leak-proof high-precision gear flowmeter cavity and a flowmeter, and belongs to the technical field of gear flowmeters.The leak-proof high-precision gear flowmeter cavity comprises a cavity body, a gear groove, a flow stopping groove, a swing rod, a reset mechanism, a blocking plate, a blocking mechanism and a flowmeter body, the cavity body is formed in the flowmeter body, and the gear groove is formed in the center of the cavity body; the blocking plate is installed on the right side of the cavity body, the blocking mechanism is located between the swing rod and the blocking plate, the swing rod deflects under the rotation of the gear, the swing rod limits the flow of fluid entering the gear groove, and the swing rod deflects to drive the blocking mechanism to stretch out of the blocking plate. The barrier plate limits the flow of fluid output from the gear groove. The diameter of the inlet flow and the diameter of the outlet flow are limited, so that the detection accuracy of the average speed and the instantaneous speed of the fluid is improved.

Description

Technical Field

[0001] The 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 lubrication system of the support rolls of the Mitsubishi Hitachi pickling continuous rolling line adopts centralized thin oil lubrication. One set of support roll lubrication station supplies five support rolls of the rolling mill. Each support roll of the rolling mill has 4 oil points, totaling 20 user points for centralized lubrication. Oil pressure measurement and oil temperature measurement are installed at each measuring point. However, due to the centralized lubrication, the oil flow distribution of each lubrication point is not stable, and the pressure will increase under the back pressure, the oil flow will decrease or even be zero. At the same time, due to the reduction of oil flow, the temperature measurement will become the temperature of the fixed lubricating oil inside the detection pipeline. Therefore, it cannot timely and accurately reflect the actual lubrication situation of the lubrication point, and has led to a number of major equipment accidents caused by poor lubrication of the support roll bearings. Therefore, a set of equipment that can directly measure the flow rate of the support roll lubrication return oil is urgently needed. The gear flowmeter is a device used to measure the flow of liquid or gas. It estimates the flow rate by measuring the volume change of the liquid or gas flowing through the gear cavity. The basic principle of the gear flowmeter is to use a pair of meshing gears to make the fluid flow through the gear cavity and discharge it as the gear rotates, and then measure the gear speed to know the instantaneous flow rate and average flow rate of the fluid at that location.

[0003] When testing petroleum or petroleum derivatives, the liquid flows through the gear from the inlet, and the liquid exerts force on the gear to make the gear start to rotate. By measuring the gear speed and the outflow per unit time, the instantaneous speed of the fluid can be obtained. By measuring the number of circles the gear rotates within a certain period of time, the average speed of the fluid can be obtained. However, when the gear rotates, it cannot produce friction with the inner wall of the cavity, otherwise it will cause wear to the gear and the inside of the cavity. Therefore, there will be a certain gap between the gear 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 gear, so The speed and number of turns of the gears are not equivalent to the accurate values ​​required for the flow measurement at that location. Under the same flow rate, the gear flowmeter with a large gap between the gear and the inner wall of the cavity has fewer turns of the gears, and the average flow accuracy of the fluid detection will be affected; at the same time, part of the fluid bypasses the gears when flowing through 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; and based on the actual situation on site, the actual oil flow of the lubricating oil of the rolling mill support rolls is small, usually 10-40L / min, and the conventional gear flowmeter has a large measurement error, which cannot accurately reflect the actual oil flow on site and leads to serious misjudgment. And the flowmeter must be installed near the lubrication point, which is inside the rolling mill, and the ambient temperature is maintained between 60℃-90℃ all year round. The equipment has been in an emulsion flushing and steam environment, which has special requirements for the measuring equipment.

[0004] In view of the above problems, solutions have been proposed in the prior art, such as the volumetric flowmeter disclosed in patent number CN1132002C, which cuts the helical gear of the flowmeter at right angles to the axis and sets its profile tooth curve as a part of the trochoid, which is composed of circular arc tooth profile and involute tooth profile, thereby compensating for the influence of the gap between the gear and the housing, and thus 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, which makes the measured data inaccurate. It can be seen that when measuring the flow of liquid, in order to avoid wear on the gear and the inner wall of the flowmeter when rotating, there is a gap 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 the 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 fits 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 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, and 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 arm, the slot is opened on the cavity body, the partition is located between the rocker arm and the slide groove, the slide rod is installed in the slide groove, the driven magnet is located at one end of the slide rod close to the active magnet, the blocking plate is located at the right end of the slot, 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, a diversion inlet is provided on the cavity body, and the two diversion inlets are symmetrically arranged relative to the axis of the fluid inlet, 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 sealed mortise and tenon joints, 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 clearance value between the gear and the cavity body.

[0015] Furthermore, a rubber layer is installed on the inner wall of the 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, comprising 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 has an interference fit with section b.

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

[0018] 1. The leak-proof high-precision gear flowmeter cavity and flowmeter of the present invention form a fixed capacity by forming a rocker arm, a gear, a 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 pitches, 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 keeping the rotation speed and the number of rotations of the gear unchanged, thereby improving the accuracy of the average flow rate.

[0019] 2. The leakage-proof high-precision gear flowmeter cavity and flowmeter of the present invention control the blocking mechanism through a rocker rod, thereby controlling the blocking plate to limit the flow at the outlet of the flowmeter, thereby achieving a flow rate per unit time that is equal to the flow rate flowing out of the gear gap, thereby achieving the outflow amount being the same as the number of turns 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 which 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, the fluid is limited 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, the cavity for fluid circulation is expanded when the fluid is blocked, thereby clearing 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 The enlarged view of point A in the middle;

[0027] Figure 7 It 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. diversion inlet; 2. gear groove; 3. stop groove; 31. rubber layer; 4. rocker rod; 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. protrusion; 63. protruding 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. flow meter body; 81. active gear; 82. driven gear. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] See also Figure 2, a leakage-proof high-precision gear flowmeter cavity provided by an embodiment of the present invention comprises a cavity body 1, a gear groove 2, a 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 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, 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 swing rod 4 is located at the center of the stop groove 3, one end of the swing rod 4 is attached to the inner wall of the stop groove 3, the edge of the swing rod 4 and the inner wall of the stop groove 3 always form a closed state, thereby preventing the circulation of liquid, the reset mechanism 5 is located at the swing rod 4, the reset mechanism 5 is used to realize the reset of the swing rod 4, the blocking plate 6 is installed on the right side of the cavity body 1, the blocking mechanism 7 is located between the swing rod 4 and the blocking plate 6, and the blocking mechanism 7 drives the blocking plate 6 to move under the action of the swing rod 4, thereby realizing that when the gear rotates, the flow calibration detection 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 equivalent to the volume between the gear tooth pitches, so as to control the total flow rate of the fluid flowing out per unit time to be equal to the flow rate flowing through the gear, so that the rotation speed and the number of rotations of the gear do not change, 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, so as to achieve that the flow rate out per unit time is equal to the flow rate out of the gear gap, so as to achieve that the outflow amount is 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 achieving the flow 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 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 swing rod 4 and the fixed shaft 51, so that a good sealing effect can be played between the swing rod 4 and the gear, and between the swing rod 4 and the stop groove 3; the other end of the torsion spring 52 is connected to the swing rod 4, and the swing rod 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 swing rod 4 from shaking, so that the swing rod 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 swing rod 4 to always contact with the gear under the rotation of the gear, so as to avoid the swing rod 4 having too large inertia so that the swing rod 4 will not recover after the previous gear tooth rotates, and then there is a gap between the swing rod 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 reset spring 78. The active magnet 71 is installed 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 rod 74 is installed in the slide groove 72, the driven magnet 75 is located at one 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 The blocking plate 6 is driven 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 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 from being 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 realize the reset of 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 swing rod 4 in this embodiment is divided into a section 41 and a section 42 from the fixed axis 51. The length of the section 41 is greater than the length of the section 42. The length of the section 41 is equal to the radius of the entire circle of the stop groove 3. Therefore, during the rotation of the swing rod 4, the 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 swing rod 4 and the stop groove 3, thereby causing the flow rate of the liquid to be not equal to the flow rate through the gear plus the flow rate through the stop groove 3. By setting the stop groove 3 and the swing rod 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 section b 42 from contacting 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, which in turn affects 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, the overall flow entering the gear flowmeter can be controlled to avoid 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 cavity body 1 corresponding to the seating groove 61. The seating groove 61 is used to collect some impurities in the fluid and can change the flow uniformity of the fluid at the same time, thereby destroying the balance of the rotating fluid through the recessed design. After the fluid balance is destroyed, the fluid at this location exhibits anisotropy, thereby reducing the impact force of the liquid on the baffle plate 6. On the one hand, the protrusion 62 is just engaged with the seating groove 61 to avoid fluid leakage, and on the other hand, it can squeeze out the impurities in the seating groove 61 to avoid excessive accumulation of impurities on the baffle plate 6, thereby preventing too much impurity accumulation on the baffle plate 6, thereby affecting the normal use of the gear flowmeter.

[0038] In the above embodiment, the blocking plate 6 and the cavity body 1 are connected by sealing mortise and tenon joints, 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 joint structure has 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, so that the protruding end 63 located in the fluid can better resist the fluid, and 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 The moving distance of the protruding end 63 is equal to the clearance value between the gear and the cavity body 1, so that the edge of the gear fits with the end of the protruding end 63. On the one hand, the flexible protruding end 63 can reduce the collision of the gear teeth. At the same time, the protruding end 63 can control the flow rate of the water outlet, 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 stop groove 3 of the present invention is installed with a rubber layer 31, and the rubber layer 31 is a hollow structure. On the one hand, the rubber layer 31 reduces the wear of the swing rod 4 during the sliding process, and on the other hand, it 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, it can also deform under the impact of the fluid, thereby fixing the position of the swing rod 4, thereby 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 flow meter cavity mentioned in the above embodiment, and also includes a flow meter body 8. 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. The driving gear 81 and the b section 42 are interference fit. In 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 thereby improving the detection efficiency of the gear flowmeter.

[0041] When the gear flowmeter is needed to detect the flow rate of the fluid, the flowmeter body 8 is installed between the pipelines, the valve of the pipeline is started, and the fluid enters the cavity body 1, and then enters the gear groove 2 through the shunt inlet 11, and drives the driving gear 81 to rotate when passing through the driving gear 81, and 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 shunt inlet 11 flowing to the gear groove 2, the driving gear 81 and the driven gear 82 drive the swing rod 4 in the stop groove 3 to rotate, and then drive 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 a section 41 is always in contact with the stop 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 stop 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 card slot 76 on the blocking plate 6 through the card 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 bar 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 then the space at the entrance and the exit increases, that is, a gap appears between the gear and the inner wall of the cavity body 1, thereby realizing 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 implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

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

2. A leak-proof high-precision gear flowmeter cavity as claimed in 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 installed in the stop groove (3), the torsion spring (52) is wound on the fixed shaft (51), the other end of the torsion spring (52) is connected to a swing rod (4), the swing rod (4) is made of a flexible material, and a sealing ring (53) is installed between the swing rod (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) comprises 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). The active magnet (71) is mounted on both ends of the swing rod (4), the slot (72) is arranged on the cavity body (1), the partition (73) is located between the swing rod (4) and the slot (72), the slide bar (74) is mounted in the slot (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 slot (72), the slot (76) is arranged 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. A leak-proof high-precision gear flowmeter cavity as claimed in claim 2, characterized in that: The swing rod (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 flow diversion inlet (11), the two flow diversion inlets (11) are symmetrically arranged relative to the fluid inlet axis, and the flow 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. A leak-proof high-precision gear flowmeter cavity as claimed in claim 6, characterized in that: The blocking plate (6) is connected to the cavity body (1) by means of sealing mortise and tenon joints. 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. A leak-proof high-precision gear flowmeter cavity as claimed in 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: The inner wall of the stop groove (3) is provided with a rubber layer (31), 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 comprises 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 fit with the b section (42).

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