Gear flowmeter

Abstract

The invention relates to the field of flow measurement, in particular to a gear flowmeter. The gear flowmeter comprises a shell, an accommodating cavity is formed in the shell, and a liquid inlet and a liquid outlet which are communicated with the accommodating cavity are formed in the surface of the shell; the two gears are arranged in the containing cavity and meshed with each other, through holes are evenly formed in the periphery of the axis of each gear, and the two ends of each through hole are flush with the end face of the corresponding gear. The sealing assemblies are arranged at the two ends of the through hole and used for sealing the two ends of the through hole. The containing cavity is formed in the shell, the two gears can be placed in the containing cavity, the through holes are evenly formed in the peripheries of the axes of the gears, and therefore the weight of the gears can be reduced, the rotational inertia of the gears can be reduced, and the starting torque of the gears can be reduced; the sealing assembly can prevent external liquid from entering the gear to increase friction between the gear and the liquid, and the overall measurement precision is improved.

Description

Technical Field

[0001] The invention relates to the field of flow measurement, and in particular to a gear flowmeter. Background Art

[0002] Among the gear flowmeters, the most common are the oval gear flowmeter and the cylindrical gear flowmeter. The oval gear flowmeter is characterized by low pressure loss and high sensitivity, but the sealing effect of the metering chamber is not good, and the signal acquisition frequency is low, and the accuracy is relatively low; the cylindrical gear overcomes the above-mentioned shortcomings of the oval gear flowmeter, but during the use of the cylindrical gear, the liquid enters the internal space of the gear through the connection method of the gear and the shaft, which increases the friction of the liquid and leads to low measurement accuracy. In addition, the weight of the gear itself is large, resulting in a large moment of inertia for the rotation of the gear, making it difficult to measure low-pressure and low-flow liquids. In addition, the connection method of the gear and the shaft requires multiple interference fits during the assembly process, and the installation process is relatively cumbersome. Summary of the invention

[0003] In order to solve the technical problem that the gear itself is heavy, resulting in a large rotational inertia required to rotate the gear, making it difficult to measure low-pressure and low-flow liquids, one object of the present invention is to provide a gear flowmeter.

[0004] To achieve the above-mentioned purpose, an embodiment of the present invention provides a gear flowmeter, including a shell having a receiving cavity formed therein, and a liquid inlet and a liquid outlet formed on the surface of the shell and connected to the receiving cavity; two gears are arranged in the receiving cavity, the two gears are meshed with each other, and the gears are evenly provided with through holes around the gear axis, and both ends of the through holes are flush with the end faces of the gears; sealing components are arranged at both ends of the through hole, and the sealing components are used to seal the two ends of the through hole.

[0005] By opening a receiving cavity inside the shell, two gears can be placed in the receiving cavity, and the two gears mesh with each other to ensure synchronous rotation of the two gears. By evenly opening through holes around the gear axis, the weight of the gear can be reduced, the rotational inertia of the gear can be reduced, and the starting torque of the gear can be reduced, so that low-pressure and low-flow liquids can be detected, thereby improving the use range of the device. By providing sealing components at both ends of the through hole, the sealing components can be used to seal the two ends of the through hole to prevent external liquid from entering the interior of the gear during the operation of the gear and increasing the friction between the gear and the liquid, further reducing the pressure drop of the gear flowmeter and improving the overall measurement accuracy.

[0006] In addition, the gear flowmeter in the above embodiment provided by the present invention may also have the following additional technical features: In the above technical solution, the shell includes a base and a cover plate, and the receiving cavity is opened in the base. By dividing the shell into two mutually connected bases and cover plates, the receiving cavity is opened inside the base, and when the parts inside the receiving cavity are damaged, the cover plate can be opened in time to repair the parts, which is convenient for manual regular maintenance.

[0007] In the above technical solution, the shell includes a base and a cover plate, and a portion of the cavity is opened in the base, and another portion is opened in the cover plate. By opening a portion of the cavity in the base and another portion of the cavity in the cover plate, the base and the cover plate can be manually separated at any time to inspect and repair the components inside the cavity.

[0008] In the above technical solution, the liquid inlet and the liquid outlet are respectively provided on both sides of the base, and both the liquid inlet and the liquid outlet are connected to the containing cavity. By providing the liquid inlet and the liquid outlet on both sides of the base, and connecting both the liquid inlet and the liquid outlet to the containing cavity, the liquid can enter the containing cavity from the liquid inlet and be discharged from the liquid outlet, ensuring that the gear can be driven to rotate in the process.

[0009] In the above technical solution, the first connecting groove is provided at both ends of the gear, and the first connecting groove is connected to the through hole; the sealing assembly includes a first connecting member, which seals both ends of the through hole and is interference fit with the first connecting groove. By providing the first connecting groove connected to the through hole at both ends of the gear, and the first connecting member is interference fit with the first connecting groove, the first connecting member can be fixed inside the first connecting groove, sealing both ends of the through hole, preventing external liquid from entering the through hole, reducing liquid friction, further reducing the pressure drop of the gear flowmeter, and improving the overall measurement accuracy.

[0010] In the above technical solution, a sealing member is provided between the first connecting member and the first connecting groove. By providing the sealing member between the first connecting member and the first connecting groove, the through hole can be further sealed.

[0011] The above technical solution also includes a second connecting member connected to one side of the first connecting member, the second connecting member protrudes from the end face of the gear, and the second connecting member and the first connecting member have a concentric profile; a second connecting groove is provided at the bottom of the accommodating cavity and one side of the cover plate, the second connecting grooves are arranged oppositely, and the second connecting member extends into the second connecting groove. The second connecting member is provided protrudingly on the end face of the gear, the second connecting member is fixedly connected to the first connecting member, and the second connecting member and the first connecting member have a concentric profile, thereby ensuring that the gear can drive the first connecting member and the second connecting member to rotate coaxially during rotation. In addition, a second connecting groove is provided at the bottom of the accommodating cavity and on the side of the cover plate close to the base, the second connecting member extends into the second connecting groove, and the second connecting groove can limit the second connecting member to prevent the second connecting member from shifting during operation, thereby ensuring that the gear does not shift.

[0012] The above technical solution further includes a groove formed on the first connecting member and / or the second connecting member. By forming the groove on the first connecting member and / or the second connecting member, the mass of the first connecting member and the second connecting member can be further reduced, and the starting torque of the gear can be further reduced.

[0013] In the above technical solution, the first connecting member and the second connecting member are integrally formed, thereby improving the structural strength of the first connecting member and the second connecting member, and reducing the processing difficulty, and only one mold is needed to complete the processing.

[0014] The above technical solution further includes an annular groove formed on the groove wall of the second connecting groove; and a rolling element disposed inside the annular groove. By forming an annular groove on the groove wall of the second connecting groove and disposing the rolling element inside the annular groove, the second connecting element and the rolling element can be connected by rolling during the rotation of the gear, thereby reducing the friction between the second connecting element and the second connecting groove, and further reducing the starting torque of the gear.

[0015] The above technical solution also includes two annular plates, which are arranged in parallel inside the annular groove; a fixing rod, which is arranged between the two annular plates, and the fixing rods are arranged at intervals; an axial hole, which is correspondingly opened on the two annular plates, each axial hole is arranged between the two fixing rods, and the axial hole axis of the axial hole is parallel to the annular plate axis of the annular plate. By arranging two annular plates in parallel in the annular groove, the fixing rod is fixedly connected between the two annular plates, and plays a role of fixing and supporting the two annular plates. By correspondingly opening axial holes on the two annular plates, and each axial hole is located between the two fixing rods, the axis of the axial hole is parallel to the axis of the annular plate, providing conditions for the installation of rolling parts.

[0016] In the above technical solution, two rotating shafts are fixedly connected to the rolling element, and the two rotating shafts are rotatably connected to the corresponding two shaft holes. By fixing two rotating shafts on the rolling element, and the two rotating shafts are rotatably connected to the corresponding two shaft holes, the position of the rolling element is fixed, and the rolling element can evenly play a rolling friction effect, avoiding mutual interference between the two rolling elements.

[0017] In the above technical solution, the outer diameter of the annular plate is smaller than the outer diameter of the annular groove, and the inner diameter of the annular plate is larger than the inner diameter of the annular groove. By making the outer diameter of the annular plate smaller than the outer diameter of the annular groove, and the inner diameter of the annular plate larger than the inner diameter of the annular groove, the annular plate can be prevented from contacting the inner wall of the annular groove, further reducing sliding friction and reducing the starting torque of the gear.

[0018] In the above technical solution, a plurality of assembly holes are provided at intervals on the base, and a plurality of stoppers are provided at intervals on the side of the cover plate close to the base, and the stoppers extend into the assembly holes. By providing a plurality of assembly holes at intervals on the base, and providing a plurality of stoppers at intervals on the side of the cover plate close to the base, and inserting the stoppers into the assembly holes, the position of the cover plate and the base can be prevented from being offset during the installation of the base and the cover plate, thereby reducing the difficulty of assembly.

[0019] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a schematic structural diagram of a gear flowmeter according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the internal structure of a gear flowmeter according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the gear structure of an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an annular plate according to an embodiment of the present invention; Figure 5 It is a cross-sectional structural schematic diagram of a gear flowmeter according to an embodiment of the present invention; Figure 6 is a schematic cross-sectional structural diagram of a cover plate according to an embodiment of the present invention; Figure 7 It is a schematic diagram of a cross-sectional structure of a base according to an embodiment of the present invention; Figure 8 It is a schematic diagram of a cross-sectional structure of a gear according to an embodiment of the present invention; Fig. 9 is a schematic cross-sectional structural diagram of an annular plate according to an embodiment of the present invention; in, Figures 1 to 9 The corresponding relationship between the reference numerals and component names in the figure is: 1. Shell; 101. Base; 1011. Liquid inlet; 1012. Liquid outlet; 102. Cover plate; 2. Accommodating cavity; 3. Gear; 301. Gear axis; 4. Through hole; 5. First connecting groove; 6. Sealing assembly; 601. First connecting member; 7. Second connecting member; 8. Second connecting groove; 9. Groove; 10. Annular groove; 11. Rolling member; 12. Annular plate; 121. Annular plate axis; 13. Fixing rod; 14. Shaft hole; 141. Shaft hole axis; 15. Rotating shaft; 16. Assembly hole; 17. Stopper; 18. Sealing member; 100. Gear flow meter. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0023] Refer to the following Figures 1 to 9 A gear flow meter 100 according to some embodiments of the present invention is described.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 8 As shown, an embodiment of the present invention provides a gear flowmeter 100, which includes a housing 1, a gear 3 and a sealing assembly 6.

[0025] Specifically, a accommodating cavity 2 is opened inside the shell 1, and a liquid inlet 1011 and a liquid outlet 1012 connected to the accommodating cavity 2 are opened on the surface of the shell 1; two gears 3 are arranged in the accommodating cavity 2, and the two gears 3 are meshed with each other. The gears 3 are evenly provided with through holes 4 around the gear axis 301, and both ends of the through holes 4 are flush with the end faces of the gears 3; sealing components 6 are arranged at both ends of the through hole 4, and the sealing components 6 are used to seal the two ends of the through hole 4.

[0026] The gear flowmeter 100 provided by the above embodiment of the present invention has a housing cavity 2 provided inside the housing 1, two gears 3 can be placed inside the housing cavity 2, the two gears 3 mesh with each other to ensure that the two gears 3 rotate synchronously, the shape of the housing space is peanut-shaped, so that the gap between the gear 3 and the housing space is smaller, and the excessive liquid entering the housing space is avoided to increase the load of the gear 3, and the through holes 4 are evenly provided around the gear axis 301 of the gear 3, so that the weight of the gear 3 can be reduced, the rotational inertia of the gear 3 can be reduced, and the starting torque of the gear 3 can be reduced, so that low-pressure and low-flow liquid can be detected, and the use range of the device is improved, and the sealing assembly 6 is provided at both ends of the through hole 4, and the sealing assembly 6 can be used to seal the two ends of the through hole 4, so that the external liquid can be prevented from entering the gear 3 during the working process of the gear 3 and increasing the friction between the gear 3 and the liquid, further reducing the pressure drop of the gear flowmeter and improving the overall measurement accuracy. The gear 3 is made of corrosion-resistant light alloy, which further makes the weight of the gear 3 lighter and further reduces the rotational inertia of the gear 3. The traditional gear flowmeter needs to interference fit the gear 3 shaft 15 on the housing 1, interference fit the two sets of bearings in the gear 3, install the precision gasket, gear 3 and precision gasket on the shaft 15 in sequence, install the housing cover 102, and tighten the bolts. However, since the original shaft 15 is eliminated in the present application, there is no need for interference fit of the shaft 15. It is only necessary to provide the seal 18 at both ends of the through hole 4 and seal the through hole 4 with the seal 18, and the assembly process is simpler.

[0027] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in one embodiment of the present invention, the housing 1 includes a base 101 and a cover plate 102 , and the accommodating cavity 2 is opened in the base 101 .

[0028] By dividing the shell 1 into two interconnected bases 101 and cover 102, the accommodating cavity 2 is opened inside the base 101, so that when parts inside the accommodating cavity 2 are damaged, the cover 102 can be opened in time to repair the parts, which is convenient for manual regular maintenance.

[0029] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in one embodiment of the present invention, the housing 1 includes a base 101 and a cover 102 , a portion accommodating the cavity 2 is opened in the base 101 , and another portion is opened in the cover 102 .

[0030] By opening a part of the accommodating cavity 2 in the base 101 and another part of the accommodating cavity 2 in the cover plate 102 , the base 101 and the cover plate 102 can be manually separated at any time to inspect and repair the components inside the accommodating cavity 2 .

[0031] like Figure 7 As shown, in one embodiment of the present invention, the liquid inlet 1011 and the liquid outlet 1012 are respectively opened on both sides of the base 101 , and the liquid inlet 1011 and the liquid outlet 1012 are both connected to the accommodating cavity 2 .

[0032] By opening a liquid inlet 1011 and a liquid outlet 1012 on both sides of the base 101, the liquid inlet 1011 and the liquid outlet 1012 are symmetrical to each other along the meshing point of the gear 3, and the liquid inlet 1011 and the liquid outlet 1012 are both connected to the accommodating cavity 2, so that the liquid can enter the accommodating cavity 2 from the liquid inlet 1011 and be discharged from the liquid outlet 1012. In the process of the liquid entering and exiting the accommodating cavity 2, the liquid can drive the gear 3 to rotate. After the rotation of the gear 3 passes through a series of deceleration and speed ratio adjustment mechanisms, it is directly connected to the indicator needle on the instrument panel, and the total amount is displayed through a mechanical counter. The display process of this instrument panel is the existing technology and will not be elaborated here.

[0033] like Figure 5 and Figure 8 As shown, in one embodiment of the present invention, the first connecting groove 5 is opened at both ends of the gear 3, and the first connecting groove 5 is connected to the through hole 4; the sealing assembly 6 includes a first connecting member 601, which seals both ends of the through hole 4 and is interference fit with the first connecting groove 5.

[0034] By opening a first connecting groove 5 connected to the through hole 4 at both ends of the gear 3, and interference fitting the first connecting member 601 with the first connecting groove 5, the first connecting member 601 can be fixed inside the first connecting groove 5, and the first connecting member 601 does not protrude from the end face of the gear 3. The first connecting member 601 can seal both ends of the through hole 4 to prevent external liquid from entering the through hole 4, reduce liquid friction, further reduce the pressure drop of the gear flowmeter, and improve the overall measurement accuracy.

[0035] like Figure 8 As shown, in one embodiment of the present invention, a sealing member 18 is provided between the first connecting member 601 and the first connecting groove 5 .

[0036] A seal 18 is provided between the first connecting member 601 and the first connecting groove 5. The seal 18 can be a rubber ring made of corrosion-resistant rubber material, thereby preventing the seal 18 from being corroded by liquid and increasing the service life of the seal 18. In addition, the seal 18 can further seal the through hole 4.

[0037] like Figure 3 and Figure 5 As shown, in one embodiment of the present invention, it also includes a second connecting member 7, which is connected to one side of the first connecting member 601, the second connecting member 7 protrudes from the end face of the gear 3, and the contours of the second connecting member 7 and the first connecting member 601 are concentric circles; a second connecting groove 8 is opened at the bottom of the accommodating cavity 2 and one side of the cover plate 102, and the second connecting grooves 8 are arranged opposite to each other, that is, the second connecting groove 8 is opened at the bottom of the accommodating cavity 2 and one side of the cover plate 102 close to the base 101, and the second connecting member 7 extends into the second connecting groove 8.

[0038] A second connecting member 7 is protruded on the end surface of the gear 3, and the second connecting member 7 is fixedly connected to the first connecting member 601. The contours of the second connecting member 7 and the first connecting member 601 are concentric circles, thereby ensuring that the axes of the gear 3, the first connecting member 601 and the second connecting member 7 are the same, and thus during the rotation of the gear 3, the first connecting member 601 and the second connecting member 7 rotate along the same axis. In addition, a second connecting groove 8 is provided at the bottom of the accommodating cavity 2 and on the side of the cover plate 102 close to the base 101, and the second connecting member 7 extends into the second connecting groove 8. The second connecting groove 8 can limit the second connecting member 7 to prevent the second connecting member 7 from shifting during the working process, thereby ensuring that the gear 3 does not shift and improving the stability of the gear 3 during rotation.

[0039] like Figure 5 As shown, in one embodiment of the present invention, a groove 9 is further included, which is opened in the first connecting member 601 and / or the second connecting member 7.

[0040] By providing the groove 9 on the first connecting member 601 and / or the second connecting member 7 , the weight of the first connecting member 601 and the second connecting member 7 can be further reduced, and the starting torque of the gear 3 can be further reduced.

[0041] like Figure 3 and Figure 5 As shown, in one embodiment of the present invention, the first connecting member 601 and the second connecting member 7 are integrally formed.

[0042] By forming the first connecting member 601 and the second connecting member 7 as one piece, the structural strength of the first connecting member 601 and the second connecting member 7 can be improved, and the processing difficulty can be reduced, and the processing can be completed by using only one mold.

[0043] like Figure 2 , Figure 4 and Figure 5 As shown, in one embodiment of the present invention, it also includes an annular groove 10, which is opened on the groove wall of the second connecting groove 8; and a rolling element 11, which is arranged inside the annular groove 10.

[0044] By opening an annular groove 10 on the groove wall of the second connecting groove 8, the notch of the annular groove 10 is aligned with the second connecting member 7, and the rolling member 11 is arranged inside the annular groove 10, the rolling member 11 is a ball, and the diameter of the ball is smaller than the distance between the notch of the annular groove 10 and the groove bottom of the annular groove 10, so that when the second connecting member 7 contacts the ball, the second connecting member 7 and the rolling member 11 are rollingly connected during the rotation of the gear 3, reducing the friction between the second connecting member 7 and the second connecting groove 8, and further reducing the starting torque of the gear 3. When the ball does not contact the second connecting member 7, the second connecting member 7 and the ball are clearance-fitted, which can also reduce the friction between the second connecting member 7 and the second connecting groove 8, and reduce the starting torque of the gear 3. The ball structure adopts a double-end arrangement, which makes it possible that no matter what the overall installation direction of the equipment is, under the appropriate size gap design, the friction between the gear 3 and the housing 1 and the cover plate 102 is always kept as rolling friction, and the system availability is high. In addition, the double-end ball arrangement can limit the axial and radial displacement of the gear 3, and under high pressure, it can still ensure that the gear 3 does not rub against the inner wall of the housing.

[0045] like Figure 4 and Fig. 9 As shown, in one embodiment of the present invention, it also includes two annular plates 12, which are arranged in parallel inside the annular groove 10; a fixing rod 13, which is arranged between the two annular plates 12, and the fixing rods 13 are arranged at intervals; an axial hole 14, which is correspondingly opened on the two annular plates 12, each axial hole 14 is arranged between the two fixing rods 13, and the axial hole axis 141 of the axial hole 14 is parallel to the annular plate axis 121 of the annular plate 12.

[0046] By arranging two annular plates 12 in parallel in the annular groove 10, and multiple fixing rods 13 are fixedly connected between the two annular plates 12 at intervals, the fixing rods 13 play a role of fixing and supporting the two annular plates 12, and by correspondingly opening shaft holes 14 on the two annular plates 12, and each shaft hole 14 is located between the two fixing rods 13, the shaft hole axis 141 and the annular plate axis 121 are parallel to each other, providing conditions for the installation of the rolling element 11. The annular plate 12 always provides uniform axial and radial constraints to the gear 3, and with the support of the double-end balls, it can also provide the gear 3 with a rotation constraint perpendicular to the rotating shaft 15, so that the gear 3 finally only maintains the rotational freedom, effectively avoiding unnecessary interference between structures during the movement. The annular plate 12 only contacts the balls, and will not interfere with the ball chamber for storing the balls and the peripheral structures such as the end cover of the gear 3. Therefore, the axial and radial constraints of the entire assembly of the gear 3 are all provided by the balls. From the perspective of force, the newly formed ball structure can also be regarded as an angular contact rolling bearing, so the friction between the components is rolling friction. Conventional gear flow meters often use precision gaskets to provide axial constraints for gears, which also means that conventional gear flow meters overcome sliding friction during startup and operation, requiring a larger starting torque while having a larger pressure drop. Under the same conditions, rolling friction is only 1 / 40~1 / 60 of the sliding friction resistance, so this application has significant advantages during operation, especially during startup.

[0047] like Figure 4 As shown, in one embodiment of the present invention, two rotating shafts 15 are fixedly connected to the rolling element 11 , and the two rotating shafts 15 are rotatably connected to the two corresponding shaft holes 14 .

[0048] Two rotating shafts 15 are fixedly connected to the rolling element 11, and the two rotating shafts 15 are rotatably connected to the corresponding two axial holes 14 respectively, thereby fixing the position of the rolling element 11 to prevent the rolling elements 11 from colliding with each other during use and affecting the overall use effect. The rolling elements 11 are arranged at intervals to achieve a uniform rolling friction effect and avoid mutual interference between the two rolling elements 11.

[0049] like Figure 4 and Figure 5 As shown, in one embodiment of the present invention, the outer diameter of the annular plate 12 is smaller than the outer diameter of the annular groove 10 , and the inner diameter of the annular plate 12 is larger than the inner diameter of the annular groove 10 .

[0050] By making the outer diameter of the annular plate 12 smaller than the outer diameter of the annular groove 10, the inner diameter of the annular plate 12 larger than the inner diameter of the annular groove 10, and the value of the outer diameter of the annular plate 12 minus the inner diameter smaller than the diameter of the rolling element 11, it can be ensured that the rolling element 11 extends out of the annular plate 12 at both the end close to the gear 3 and the end away from the gear 3 in the radial direction of the annular plate 12, thereby ensuring that the second connecting member 7 will only contact the rolling element 11 and will not contact the annular plate 12, further reducing unnecessary sliding friction and reducing the starting torque of the gear 3.

[0051] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, a plurality of assembly holes 16 are spaced apart on the base 101 , and a plurality of stoppers 17 are spaced apart on a side of the cover plate 102 close to the base 101 , and the stoppers 17 extend into the assembly holes 16 .

[0052] By providing a plurality of assembly holes 16 at intervals on the base 101 and a plurality of limit members 17 at intervals on the side of the cover 102 close to the base 101, the limit members 17 are inserted into the assembly holes 16, so that the positions of the cover 102 and the base 101 can be prevented from being offset during the installation of the base 101 and the cover 102, thereby reducing the difficulty of assembly. After the positions of the base 101 and the cover 102 are fixed to each other, the base 101 and the cover 102 are connected to each other by screws, so that the base 101 and the cover 102 can be prevented from loosening, thereby improving the stability of the device.

[0053] When the present invention is applied to a helical gear flowmeter, it can greatly improve the problem that the helical gear 3 generates a large axial lift under high speed and high pressure conditions, thereby increasing the friction. Since the present invention uses rolling friction everywhere, the impact of positive pressure changes is much lower than that of sliding friction. Therefore, the present invention can theoretically be applied to various types of gear flowmeters, especially helical gear flowmeters.

[0054] The present invention has the following advantages: 1. By opening a through hole 4 inside the gear 3 and sealing both ends of the through hole 4 through the first connecting member 601, it is possible to prevent external liquid from entering the gear 3, reduce the friction between the liquid and the gear 3, further reduce the pressure drop of the gear flowmeter, and improve the overall measurement accuracy. In addition, the weight of the gear 3 is reduced, thereby reducing the rotational inertia of the gear 3 and reducing the resistance of the gear 3 when it starts to rotate.

[0055] 2. By using the second connecting member 7 and the ball to form a rotating pair, the original sliding friction is converted into rolling friction, which greatly reduces the friction force and further reduces the resistance of the gear 3 when it starts to rotate, so that low-pressure and low-flow liquid can also drive the gear 3 to rotate, thereby measuring the low-pressure and low-flow liquid.

[0056] 3. The ball structure adopts a double-end arrangement, which ensures that no matter what the overall installation direction of the equipment is, under the appropriate size gap design, the friction between the gear 3 and the housing 1 and the cover plate 102 is always kept as rolling friction, and the system availability is high. In addition, the double-end ball arrangement can limit the axial and radial displacement of the gear 3, and under high pressure, it can still ensure that the gear 3 does not rub against the inner wall of the housing.

[0057] In the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of the present invention, it is necessary to understand that the terms "inside", "outside", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0059] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gear flow meter, characterized in that: include: A shell body, with a receiving cavity formed inside, and a liquid inlet and a liquid outlet formed on a surface of the shell body and connected to the receiving cavity; Two gears are arranged in the accommodating cavity, the two gears are meshed with each other, through holes are evenly opened around the gear axis, and both ends of the through holes are flush with the end faces of the gears; The sealing components are arranged at both ends of the through hole, and the sealing components are used to seal the two ends of the through hole.

2. The gear flowmeter according to claim 1, characterized in that: The housing comprises a base and a cover plate, and the accommodating cavity is opened in the base; Wherein, the liquid inlet and the liquid outlet are respectively provided on two sides of the base, and the liquid inlet and the liquid outlet are both communicated with the accommodating cavity; and / or A plurality of assembly holes are provided at intervals on the base, and a plurality of limit members are provided at intervals on a side of the cover plate close to the base, and the limit members extend into the interior of the assembly holes.

3. The gear flow meter according to claim 1, characterized in that: The shell comprises a base and a cover plate, a part of the accommodating cavity is opened in the base, and another part is opened in the cover plate.

4. The gear flow meter according to claim 2 or 3, characterized in that: Also includes: A first connecting groove is provided at two ends of the gear, and the first connecting groove is connected to the through hole; The sealing assembly comprises: The first connecting member seals both ends of the through hole and is interference fit with the first connecting groove.

5. The gear flow meter according to claim 4, characterized in that: A sealing member is provided between the first connecting member and the first connecting groove.

6. The gear flow meter according to claim 5, characterized in that: Also includes: a second connecting member connected to one side of the first connecting member, the second connecting member protruding from the end surface of the gear, and the contours of the second connecting member and the first connecting member are concentric circles; The second connecting groove is formed at the bottom of the accommodating cavity and at one side of the cover plate. The second connecting grooves are arranged opposite to each other, and the second connecting member extends into the second connecting groove.

7. The gear flow meter according to claim 6, characterized in that: Also includes: A groove is provided on the first connecting member and / or the second connecting member; And / or the first connecting member and the second connecting member are integrally formed.

8. The gear flow meter according to claim 6, characterized in that: Also includes: an annular groove, formed on the groove wall of the second connecting groove; The rolling element is arranged inside the annular groove.

9. The gear flow meter according to claim 8, characterized in that: Also includes: Two annular plates are arranged in parallel inside the annular groove; A fixing rod is arranged between the two annular plates, and the fixing rods are arranged at intervals; Axial holes are correspondingly opened on the two annular plates, each of the axial holes is arranged between the two fixing rods, and the axial hole axis of the axial hole is parallel to the annular plate axis of the annular plate.

10. The gear flow meter according to claim 9, characterized in that: Two rotating shafts are fixedly connected to the rolling element, and the two rotating shafts are rotatably connected to the corresponding two shaft holes respectively; and / or The outer diameter of the annular plate is smaller than the outer diameter of the annular groove, and the inner diameter of the annular plate is larger than the inner diameter of the annular groove.

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