Axial flow impeller type water meter

Abstract

The utility model discloses an axial flow impeller type water meter, which belongs to the technical field of metering equipment, and comprises a shell with a water flow channel, a metering device arranged on the shell, and a first flow guide device, an impeller device and a second flow guide device which are sequentially arranged in the shell along the axis direction, the first flow guide device and the second flow guide device are fixedly connected to the ends, close to the first port and the second port, in the shell respectively, and the impeller device is rotatably connected between the first flow guide device and the second flow guide device through an impeller shaft; the first ball body and the second ball body are respectively arranged between the two end parts of the impeller shaft and the first flow guide device and the second flow guide device, and are respectively propped against the two end surfaces of the impeller shaft. The ball is arranged between the two ends, making contact with the flow guiding device, of the impeller shaft, surface contact between the impeller shaft and the flow guiding device is changed into point contact, borne friction force is greatly reduced, the measuring precision can be improved, and the service life can be prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metering equipment, in particular to an axial flow impeller type water meter. BACKGROUND

[0002] The axial flow impeller type water meter is a commonly used flow metering device, which is based on the rotational force generated when water flows through the impeller. When water flows through the water meter, it will push the impeller to rotate, and the rotation of the impeller is converted into an electrical signal or a mechanical reading through a magnetic induction device or a gear, thereby realizing the measurement and recording of water flow.

[0003] However, the impeller of the axial flow impeller type water meter is often limited by the fixed supports located at both ends of its axis. During operation, there will be a lot of friction between the high-speed rotating impeller shaft and the fixed support, which is often surface friction, affecting the measurement accuracy and service life. Therefore, there is an urgent need for a new type of axial flow impeller type water meter that can reduce the friction between the impeller shaft and the support. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide an axial flow impeller type water meter to solve the problem of large friction affecting the measurement accuracy and service life in the prior art.

[0005] The embodiments of the present application can be implemented by the following technical solutions:

[0006] An axial flow impeller type water meter, comprising a housing having a water flow channel, a metering device mounted on the housing, and a first flow guide device, an impeller device and a second flow guide device mounted in the housing in sequence along the axis direction, the first flow guide device and the second flow guide device are respectively fixedly connected to one end of the housing near the first port and the second port, and the impeller device is rotatably connected between the first flow guide device and the second flow guide device through an impeller shaft; further comprising a first ball and a second ball, the first ball and the second ball are respectively arranged between the two end portions of the impeller shaft and the first flow guide device and the second flow guide device, and respectively abut the two end faces of the impeller shaft.

[0007] Further, the first ball and / or the second ball are made of ceramic material;

[0008] And / or, the impeller shaft is made of stainless steel material;

[0009] And / or, the diameters of the first ball and the second ball are greater than the outer diameter of the impeller shaft.

[0010] Further, the first flow guide device comprises a flow guide body and a plurality of flow guide plates arranged uniformly between the flow guide body and the inner wall of the shell in the circumferential direction; the flow guide body is provided with a first accommodating groove on the side facing the impeller shaft, the first accommodating groove is matched with the impeller shaft, the inner diameter of the first accommodating groove is greater than the outer diameter of the impeller shaft, and the first ball is arranged in the first accommodating groove.

[0011] Further, the second flow guide device comprises a flow guide body and a plurality of flow guide plates arranged uniformly between the flow guide body and the inner wall of the shell in the circumferential direction; the flow guide body is provided with a first accommodating groove on the side facing the impeller shaft, the first accommodating groove is matched with the impeller shaft, the inner diameter of the first accommodating groove is greater than the outer diameter of the impeller shaft, and the second ball is arranged in the first accommodating groove.

[0012] Further, the number of the flow guide plates is odd.

[0013] Further, the flow guide body comprises a first flow guide part in the shape of a truncated cone and a second flow guide part in the shape of a cylinder, and the first flow guide part and the second flow guide part are smoothly connected.

[0014] Further, the flow guide body is provided with a second accommodating groove matched with the first hub part of the impeller device, the second accommodating groove is located at the end of the first accommodating groove close to the impeller device, and the inner diameter of the second accommodating groove is greater than the outer diameter of the first hub part.

[0015] Further, the impeller device comprises an impeller shaft, a hub and a plurality of blades fixed and connected in sequence coaxially from inside to outside, and the plurality of blades are arranged uniformly on the outer circumferential side of the hub.

[0016] Further, the number of the blades is odd.

[0017] Further, the hub comprises a first hub part and a second hub part arranged on the outer circumferential side of the first hub part, the end of the second hub part close to the second flow guide device forms a shoulder structure with the first hub part, and the end of the second hub part close to the first flow guide device forms a hub groove part with the first hub part.

[0018] Further, the shell comprises a first shell and a second shell arranged coaxially, and the first shell and the second shell are detachably connected.

[0019] The axial flow impeller type water meter provided by the embodiment of the present application has at least the following beneficial effects:

[0020] The embodiment of the present application sets a ball between the two ends of the impeller shaft in contact with the flow guide device, so that the surface contact between the impeller shaft and the flow guide device is changed to point contact, the friction force borne is greatly reduced, the measurement accuracy is improved, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the axial flow impeller water meter according to an embodiment of this application;

[0022] Figure 2 for Figure 1 An exploded view of the overall structure;

[0023] Figure 3 for Figure 1 A cross-sectional schematic diagram;

[0024] Figure 4 for Figure 3 Enlarged view of the middle circle;

[0025] Figure 5 for Figure 1 Schematic diagram of the cross-section of the middle section;

[0026] Figure 6 for Figure 1 A cross-sectional view of another part of the structure;

[0027] Figure 7 for Figure 1 A schematic diagram of a cross-section of another part of the structure;

[0028] Numbers in the diagram

[0029] 1-Housing, 11-First housing, 12-Second housing, 13-First port, 14-Second port, 15-Measuring interface, 2-First flow guide device, 3-Second flow guide device, 21, 31-Flow guide, 22, 32-Flow guide plate, 211, 311-First flow guide section, 212, 312-Second flow guide section, 213, 313-First receiving groove, 214, 314-Second receiving groove, 4-Impeller device, 41-Impeller shaft, 42-Hub, 421-First hub section, 422-Second hub section, 423-Hub groove section, 43-Blade, 51-Sensor, 52-Signal element, 61-First sphere, 62-Second sphere. Detailed Implementation

[0030] The present application will now be further described based on preferred embodiments and with reference to the accompanying drawings.

[0031] Furthermore, for ease of understanding, various components on the drawings have been enlarged or reduced, but this is not intended to limit the scope of protection of this application.

[0032] Singular forms of words also include plural meanings, and vice versa.

[0033] In the description in the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the embodiments of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, the first, second and the like are used in the specification, but these are not limited by the order of manufacture, and cannot be understood as indicating or implying relative importance, and the name may be different in the detailed description and the claims of the present application.

[0034] The terms in the specification are used to illustrate the embodiments of the present application, but are not intended to limit the present application. It should be noted that unless otherwise explicitly specified and limited, if the terms "provided", "connected", "connected" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, can be directly connected, or indirectly connected through an intermediate medium, can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be specifically understood.

[0035] In combination Figures 1 to 7 As shown, the axial impeller type water meter provided by the embodiments of the present application includes a shell 1 having a water flow channel, a metering device mounted on the shell 1, and a first flow guide device 2, a first ball 61, an impeller device 4, a second ball 62 and a second flow guide device 3 mounted in the shell 1 in sequence along the axial direction;

[0036] The first flow guide device 2 and the second flow guide device 3 are fixedly connected to the inner wall of the shell 1, and have the functions of guiding flow and supporting the impeller device 4; the impeller device 4 is rotatably connected between the first flow guide device 2 and the second flow guide device 3; the first ball 61 and the second ball 62 are respectively arranged between the two end portions of the impeller shaft 41 and the first flow guide device 2 and the second flow guide device 3, and respectively abut the two end faces of the impeller shaft 41; the metering device includes a sensor 51, a signal element 52 and a flow integrator (not shown in the figure); in operation, first, the fluid flow rate is converted into the rotational speed of the impeller device 4, then the rotational speed is converted into an electrical signal through the signal element 52, and the electrical signal is transmitted to the flow integrator through the sensor 51, to finally realize the measurement of flow. Through the arrangement of the first ball 61 and the second ball 62, the original face contact between the end face of the impeller shaft 41 and the flow guide device is changed to point contact, which greatly reduces the friction and improves the measurement accuracy and prolongs the service life.

[0037] Specifically, the shell 1 is a hollow tubular structure, one end of which is a first port 13 and the other end is a second port 14, so that water flows in and out from the two ports, and a measurement interface 15 is arranged on the side wall of the shell 1, which is used to reserve space for wiring between the sensor 51 and the flow totalizer.

[0038] Specifically, referring to Figure 3 、 Figure 4 and Figure 5 , the first flow guide device 2 is fixedly connected to the inner wall of the shell 1 near the first port 13, which includes a central flow guide body 21 and a plurality of flow guide plates 22 uniformly distributed along the circumference of the flow guide body 21 on the outer circumferential side of the flow guide body 21.

[0039] Wherein, the flow guide body 21 includes a first flow guide part 211 in the form of a truncated cone arranged along the axis direction and a second flow guide part 212 in the form of a cylinder, and the first flow guide part 211 and the second flow guide part 212 are smoothly transitioned, the first flow guide part 211 is located on the side of the second flow guide part 212 away from the impeller device 4, and the arrangement of this structure is conducive to the stable flow of fluid; further, a first accommodating groove 213 for accommodating the impeller shaft 41 is arranged on the side of the flow guide body 21 close to the impeller device 4, and a second accommodating groove 214 for accommodating the first hub part 421 is arranged on the side of the flow guide body 21 close to the impeller device 4, and the second accommodating groove 214 is arranged on the end of the first accommodating groove 213 close to the impeller device 4 and communicates with the first accommodating groove 213; further, the inner diameter of the first accommodating groove 213 is greater than the outer diameter of the impeller shaft 41, and the inner diameter of the second accommodating groove 214 is greater than the outer diameter of the first hub part 421, so that the impeller device 4 is suspended and rotates without contacting the first flow guide device 2 during operation.

[0040] Further, one end of each of the plurality of flow guide plates 22 is fixedly connected to the outer circumferential side of the flow guide body 21, and the other end is fixedly connected to the inner wall of the shell 1, in some preferred embodiments, the number of flow guide plates 22 is odd, such as 3, 5, 7, etc., and the arrangement of odd number of flow guide plates is conducive to the formation of stable flow of fluid, thereby improving the measurement accuracy.

[0041] Specifically, referring to Figure 3 、 Figure 4 and Figure 6The second flow guide device 3 is fixedly connected to the inner wall of the shell 1 near the second port 14, and has a structure similar to that of the first flow guide device 2. The second flow guide device 3 comprises a flow guide body 31 located at the center and a plurality of flow guide plates 32 uniformly distributed along the circumference of the flow guide body 31. The flow guide body 31 comprises a first flow guide part 311 in the shape of a truncated cone and a second flow guide part 312 in the shape of a cylinder. The first flow guide part 311 is located on the side of the second flow guide part 312 away from the impeller device 4, and the first flow guide part 311 and the second flow guide part 312 are smoothly connected. Further, a first accommodating groove 313 for accommodating the impeller shaft 41 and a second accommodating groove 314 for accommodating the first hub part 421 are formed on the side of the flow guide body 31 near the impeller device 4. The second accommodating groove 314 is located at the end of the first accommodating groove 313 near the impeller device 4 and is in communication with the first accommodating groove 313. The inner diameter of the first accommodating groove 313 is greater than the outer diameter of the impeller shaft 41, and the inner diameter of the second accommodating groove 314 is greater than the outer diameter of the first hub part 421, so that the impeller device 4 can rotate in suspension without contacting the second flow guide device 3 during operation. Further, one end of each of the plurality of flow guide plates 32 is fixedly connected to the outer circumferential side of the flow guide body 31, and the other end is fixedly connected to the inner wall of the shell 1. In some preferred embodiments, the number of flow guide plates 32 is an odd number, such as 3, 5, 7, etc. An odd number of flow guide plates 32 is beneficial for the formation of stable fluid flow, thereby improving measurement accuracy.

[0042] Specifically, referring to Figure 2 、 Figure 4 and Figure 7 , the impeller device 4 comprises an impeller shaft 41, a hub 42 and a plurality of blades 43 fixedly connected in sequence from the inside to the outside along the same axis. The plurality of blades 43 are uniformly arranged along the circumferential side of the hub 42. In some preferred embodiments, the number of blades 43 is an odd number. Further, the hub 42 comprises a first hub part 421 and a second hub part 422. The second hub part 422 is arranged on the outer circumferential side of the first hub part 421 for mounting the blades 43. Further, the end of the second hub part 422 near the second flow guide device 3 forms a shoulder structure together with the first hub part 421, which is matched with the second flow guide part 312. The end of the second hub part 422 near the first flow guide device 2 is provided with a hub groove part 423 matched with the second flow guide part 212, thereby forming a relatively sealed space for accommodating the first hub part 421 and the impeller shaft 41, so as to avoid the inflow of impurities carried by the water flow into the accommodating groove.

[0043] Specifically, referring to Figure 3The first ball 61 is arranged in the first accommodating groove 213 of the first flow guide device 2 and abuts against the first accommodating groove 213 and the impeller shaft 41 respectively, and the second ball 62 is arranged in the first accommodating groove 313 of the second flow guide device 3 and abuts against the first accommodating groove 313 and the impeller shaft 41 respectively. In some preferred embodiments, the diameters of the first ball 61 and the second ball 62 are greater than the outer diameter of the impeller shaft 41.

[0044] Specifically, referring to Figure 7 The signal element 52 is specifically a magnet, and the number thereof can be one or more, which is arranged in the hub 42 of the impeller device 4 uniformly in the circumferential direction, and the sensor 51 is specifically a magnetic force sensor, which is arranged at a position corresponding to the signal element 52 to collect signals.

[0045] In some preferred embodiments, the impeller shaft 41 is made of stainless steel to enhance the overall structural strength.

[0046] In some preferred embodiments, the first ball 61 and the second ball 62 are both made of ceramic material, which can further avoid excessive wear of the balls caused by long-term mutual friction with the impeller shaft, thereby affecting the measurement accuracy.

[0047] In some preferred embodiments, the shell 1 comprises a coaxially arranged first shell 11 and a second shell 12, and the first shell 11 and the second shell 12 are detachably connected, the first flow guide device 2 is fixedly connected to the inner wall of the first shell 11, and the second flow guide device 3 is fixedly connected to the inner wall of the second shell 12, so as to facilitate installation and disassembly.

[0048] The specific embodiments of the present application are described in detail above, and for those skilled in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also belong to the protection scope of the present application.

Claims

1. A water meter of axial flow impeller type, comprising a housing (1) having a water flow passage, a metering device mounted on the housing (1), and a first flow guide device (2), an impeller device (4) and a second flow guide device (3) mounted in sequence along an axial direction inside the housing (1), characterized in that: the first flow guide device (2) and the second flow guide device (3) are fixedly connected to one end of the housing (1) near a first port (13) and a second port (14) respectively, and the impeller device (4) is rotatably connected between the first flow guide device (2) and the second flow guide device (3) through an impeller shaft (41); further comprising a first ball (61) and a second ball (62), the first ball (61) and the second ball (62) are respectively arranged between the two end portions of the impeller shaft (41) and the first flow guide device (2) and the second flow guide device (3), and respectively abut against the two end faces of the impeller shaft (41). 2.The water meter of axial flow impeller type according to claim 1, characterized in that: the first ball (61) and / or the second ball (62) are made of ceramic material; and / or the impeller shaft (41) is made of stainless steel material; and / or the diameters of the first ball (61) and the second ball (62) are greater than the outer diameter of the impeller shaft (41). 3.The water meter of axial flow impeller type according to claim 1, characterized in that: the first flow guide device (2) comprises a flow guide body (21), and a plurality of flow guide plates (22) are uniformly arranged between the circumferential side of the flow guide body (21) and the inner wall of the housing (1) in a circumferential direction; a first accommodating groove (213) matched with the impeller shaft (41) is formed on the side of the flow guide body (21) facing the impeller shaft (41), the inner diameter of the first accommodating groove (213) is greater than the outer diameter of the impeller shaft (41), and the first ball (61) is arranged in the first accommodating groove (213). 4.The water meter of axial flow impeller type according to claim 3, characterized in that: the second flow guide device (3) comprises a flow guide body (31), and a plurality of flow guide plates (32) are uniformly arranged between the circumferential side of the flow guide body (31) and the inner wall of the housing (1) in a circumferential direction; a first accommodating groove (313) matched with the impeller shaft (41) is formed on the side of the flow guide body (31) facing the impeller shaft (41), the inner diameter of the first accommodating groove (313) is greater than the outer diameter of the impeller shaft (41), and the second ball (62) is arranged in the first accommodating groove (313). 5.The water meter of axial flow impeller type according to claim 4, characterized in that: the number of the flow guide plates (22, 32) is odd. 6.The water meter of axial flow impeller type according to claim 4, characterized in that: the flow guide body (21, 31) comprises a first flow guide portion (211, 311) in the shape of a truncated cone and a second flow guide portion (212, 312) in the shape of a cylinder, and the first flow guide portion (211, 311) and the second flow guide portion (212, 312) are smoothly connected. 7.The water meter of axial flow impeller type according to claim 4, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The flow guide (21, 31) is further provided with a second accommodating groove (214, 314) matched with the first hub part (421) of the impeller device (4), the second accommodating groove (214, 314) is located at one end of the first accommodating groove (213, 313) close to the impeller device (4), and the inner diameter of the second accommodating groove (214, 314) is greater than the outer diameter of the first hub part (421).

8. The axial flow impeller water meter according to claim 1, characterized in that, The impeller device (4) comprises an impeller shaft (41), a hub (42) and a plurality of blades (43) fixedly connected in sequence from inside to outside along the same axis, and the plurality of blades (43) are uniformly arranged on the outer circumferential side of the hub (42).

9. The axial flow impeller water meter according to claim 8, characterized in that, The number of the blades (43) is odd; And / or, the hub (42) comprises a first hub part (421) and a second hub part (422) arranged on the outer circumferential side thereof, the second hub part (422) close to one end of the second flow guide device (3) forms a shoulder structure with the first hub part (421), and the second hub part (422) close to one end of the first flow guide device (2) forms a hub groove part (423) with the first hub part (421).

10. The axial flow impeller water meter according to claim 1, characterized in that, The shell (1) comprises a first shell (11) and a second shell (12) arranged coaxially, and the first shell (11) and the second shell (12) are detachably connected.

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