A constant flow liquid supply device for flow meter calibration

Abstract

The application provides a constant flow liquid supply device for flow meter calibration, and relates to the technical field of flow meter calibration, which comprises a cylinder, a piston and a flow straightener. A water storage cavity in the cylinder is divided into a rod cavity and a rodless cavity by the piston. The piston is driven to reciprocate along the axial direction via a driving assembly. The flow straightener has a first flow path and a second flow path, which have the same fluid direction flowing through the flow meter. The rod cavity is provided with a first outlet and a second outlet, and the rodless cavity is provided with a third outlet and a fourth outlet. The first outlet is used to communicate with the water inlet end of the first flow path or the water outlet end of the second flow path. The second outlet is externally connected with a water storage tank used to accommodate excess liquid in the rod cavity. The third outlet is used to communicate with the water outlet end of the first flow path or the water inlet end of the second flow path. The fourth outlet is externally connected with a water supplement tank used to supplement liquid in the rodless cavity, so that the liquid volume in the water storage cavity is constant, the circulation of liquid is realized, and the problem that the existing liquid supply device for flow meter calibration cannot provide a stable liquid source is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow meter calibration, in particular to a constant flow liquid supply device for flow meter calibration. BACKGROUND

[0002] Liquid flow calibration is a problem often encountered in the field of detection, and stable flow and synchronous measurement are required for accurate calibration results. Among them, stable flow is crucial, and existing liquid supply devices are difficult to provide stable liquid source continuously, which affects the accuracy of calibration and also has a great impact on the efficiency of calibration. SUMMARY

[0003] The present application discloses a constant flow liquid supply device for flow meter calibration, aiming to improve the problem that the existing liquid supply device for flow meter calibration cannot provide stable liquid source.

[0004] The present application adopts the following scheme:

[0005] A constant flow liquid supply device for flow meter calibration, comprising a cylinder, a piston and a flow straightener, the cylinder is provided with a water storage cavity; the piston is arranged in the water storage cavity and is sealed with the inner wall of the water storage cavity, so that the water storage cavity is divided into a rod cavity and a rodless cavity; the piston is driven to reciprocate along the axial direction of the cylinder by a driving assembly; the flow straightener has a first flow path and a second flow path, and the fluid direction of the first flow path and the second flow path is the same through the flow meter; wherein the rod cavity is provided with a first outlet and a second outlet, the rodless cavity is provided with a third outlet and a fourth outlet, the first outlet is connected with the water inlet end of the first flow path or the water outlet end of the second flow path, and the second outlet is connected with a water storage tank for accommodating excess liquid in the rod cavity; the third outlet is connected with the water outlet end of the first flow path or the water inlet end of the second flow path, and the fourth outlet is connected with a water supplement tank for supplementing liquid in the rodless cavity, so that the volume of liquid in the water storage cavity is constant, realizing the circulation of liquid.

[0006] As a further improvement, the driving assembly comprises a motor, a speed reducer, a shaft coupling and a ball screw, one end of the ball screw is inserted into the piston, and the other end is connected with the shaft coupling, the speed reducer and the motor in sequence.

[0007] As a further improvement, the cylinder is provided with a top plate, an upper cover plate, a bottom plate and a lower cover plate, the top plate and the upper cover plate are arranged at the upper end of the cylinder, the upper cover plate is provided with the first outlet and the second outlet, the bottom plate and the lower cover plate are arranged at the lower end of the cylinder, and the lower cover plate is provided with the third outlet and the fourth outlet.

[0008] As a further improvement, a first angular valve one-way valve is arranged between the second outlet and the water storage tank, and a second angular valve one-way valve is arranged between the fourth outlet and the water supplement tank, so as to realize one-way flow of the liquid.

[0009] As a further improvement, a plurality of triangular supports are connected to the top plate, and a support plate is connected to the triangular supports, one end of the support plate being provided with a fixing support, and the driving assembly is arranged to be radially limited via the fixing support.

[0010] As a further improvement, the rectifying member comprises four pipes arranged side by side in pairs, and a three-way water distributor is connected to each end of each pipe, and a one-way valve is arranged on each pipe.

[0011] As a further improvement, one end of each pipe is connected to a one-way valve, and the other end is connected to a three-way water distributor via a connector.

[0012] As a further improvement, the rectifying member is fixed on a track via a plurality of pipe clamps, and the track is connected to the support plate.

[0013] By adopting the above technical scheme, the following technical effects can be achieved:

[0014] The rectifying member is arranged to make the liquid flow through the flowmeter to be measured in the same direction during the reciprocating movement of the piston. Meanwhile, the water storage tank and the water supplement tank are arranged to ensure that the volume difference of the liquid between the rod cavity and the rod cavity during the movement of the piston is supplemented, so as to realize constant volume of the liquid in the liquid storage cavity and circulation of the liquid, thereby ensuring sustainable and stable liquid supply of the liquid supply device, improving the accuracy and efficiency of the calibration. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0016] Figure 1 is a structural schematic view of one embodiment of the present application;

[0017] Figure 2 is a sectional view of one embodiment of the present application;

[0018] Figure 3 is a structural schematic view of a rectifying member of one embodiment of the present application;

[0019] Figure 4is a schematic diagram of the working principle of one embodiment of the present application.

[0020] Icon: 1-motor; 2-reducer; 3-coupling; 4-driving assembly; 5-rectifier; 6-tube clamp; 7-track; 8-supporting plate; 9-top plate; 10-upper cover plate; 11-cylinder body; 12-lower cover plate; 13-bottom plate; 14-base; 15-pull rod; 16-triangle support; 17-fixed support; 20-roller screw; 21-first angle valve; 22-first copper nipple; 23-first outlet; 24-piston; 25-nut; 26-water storage cavity; 27-liquid passage; 28-second angle valve; 29-third angle valve; 30-second outlet; 31-fourth angle valve; 32-first angle valve check valve; 33-second copper nipple; 35-first three-way water distributor; 36-first check valve; 37-second check valve; 38-pipeline; 39-connector; 40-second three-way water distributor; 41-third three-way water distributor; 42-third check valve; 43-fourth check valve; 44-fourth three-way water distributor. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] EMBODIMENT

[0023] COMBINATION Figures 1 to 4The embodiment provides a constant-flow liquid supply device for flowmeter calibration, which comprises a cylinder body 11, a piston 24 and a flow regulating piece 5, the cylinder body 11 is internally provided with a water storage cavity 26; the piston 24 is arranged in the water storage cavity 26 and is sealed with the inner wall of the water storage cavity 26, so that the water storage cavity 26 is divided into a rod cavity and a rodless cavity; the piston 24 is driven to reciprocate along the axial direction of the cylinder body 11 through a driving assembly 4; the flow regulating piece 5 has a first flow path and a second flow path, and the fluid flowing through the first flow path and the second flow path has the same direction of flowing through the flowmeter; wherein the rod cavity is provided with a first outlet 23 and a second outlet 30, the rodless cavity is provided with a third outlet and a fourth outlet, the first outlet 23 is used for being communicated with the water inlet end of the first flow path or the water outlet end of the second flow path, the second outlet 30 is externally connected with a water storage tank used for containing the excess liquid in the rod cavity; the third outlet is used for being communicated with the water outlet end of the first flow path or the water inlet end of the second flow path, and the fourth outlet is externally connected with a water supplement tank used for supplementing the liquid in the rodless cavity, so that the liquid volume in the water storage cavity 26 is constant, and the circulation of the liquid is realized.

[0024] For example, when the driving assembly 4 drives the piston 24 to move upwards, the piston 24 compresses the rod cavity, at this time, the liquid flows out from the first outlet 23, flows into the third outlet through the first flow path (referring to the solid line in FIG. 4), at this time, the fluid volume output from the rod cavity is less than the fluid volume that should be received by the rodless cavity, so the insufficient fluid volume difference can be sucked from the water supplement tank through the fourth outlet. Figure 4 When the driving assembly 4 drives the piston 24 to move downwards, the piston 24 compresses the rodless cavity, at this time, the liquid flows out from the third outlet, flows into the first outlet 23 through the second flow path (referring to the dotted line in FIG. 4), at this time, the fluid volume output from the rodless cavity is greater than the fluid volume that should be received by the rod cavity, so the excess fluid flows into the water storage tank through the second outlet 30, thereby ensuring that the fluid volume in the water storage cavity is constant. Figure 4 It is to be noted that the volume difference between the rod cavity and the rodless cavity is caused by the piston rod arranged in the rod cavity, the driving assembly 4 or other structures. In other embodiments, the water storage tank can be communicated with the water supplement tank, which is not limited thereto and is not specifically limited.

[0025] In the embodiment, the flow regulating piece 5 is arranged to make the liquid flowing through the flowmeter in the same direction during the reciprocating movement of the piston 24. Meanwhile, the arrangement of the water storage tank and the water supplement tank can guarantee that the liquid volume difference between the rod cavity and the rodless cavity during the movement of the piston 24 is supplemented, thereby realizing the constant liquid volume in the water storage cavity and the circulation of the liquid, further guaranteeing the sustainable and stable liquid supply of the liquid supply device, improving the calibration accuracy and the calibration efficiency.

[0026] In a preferred embodiment, the driving assembly 4 comprises a motor 1, a speed reducer 2, a shaft coupling 3 and a ball screw 20, wherein one end of the ball screw 20 is inserted into the piston 24, and the other end is sequentially connected with the shaft coupling 3, the speed reducer 2 and the motor 1.

[0027] In another embodiment, the cylinder 11 is provided with a top plate 9, an upper cover plate 10, a bottom plate 13 and a lower cover plate 12, the top plate 9 and the upper cover plate 10 are arranged at the upper end of the cylinder 11, the upper cover plate 10 is provided with a first outlet 23 and a second outlet 30, the bottom plate 13 and the lower cover plate 12 are arranged at the lower end of the cylinder 11, and the lower cover plate 12 is placed on the base 14 and is provided with a third outlet and a fourth outlet. Specifically, the top plate 9 is provided with a plurality of positioning through holes, the upper cover plate 10 is provided with threaded holes corresponding to the positioning through holes, and the top plate 9 and the upper cover plate 10 are fixedly connected in the center by screws. Similarly, the bottom plate 13 is provided with a plurality of positioning through holes, the lower cover plate 12 is provided with threaded holes corresponding to the positioning through holes on the bottom plate 13, and the bottom plate 13 and the lower cover plate 12 are fixedly connected in the center by screws. Further, the upper cover plate 10 and the lower cover plate 12 are respectively provided with shoulders, and the water storage cylinder is axially positioned and radially positioned by the two shoulders. A plurality of threaded pull rods 15 pass through the positioning holes on the top plate 9 and the bottom plate 13 for radial positioning, and the pull rods 15 are fixed by nuts 25.

[0028] In other embodiments, the upper cover plate 10 is provided with a stepped through hole, the ball screw 20 is axially positioned by the stepped shoulder, and the ball screw 20 is fixed with the shoulder of the upper cover plate 10 by a screw. The piston 24 is provided with a stepped through hole in the center, the ball screw 20 is inserted into the center through hole of the piston 24, and the piston 24 is fixedly connected by the stepped shoulder and a nut 25.

[0029] On the basis of the above-mentioned embodiments, in an optional embodiment of the present application, a first angle valve one-way valve 32 is arranged between the second outlet 30 and the water storage tank, and a second angle valve one-way valve is arranged between the fourth outlet and the water tank, so that the liquid flows in one direction. Specifically, the upper cover plate 10 is provided with a first outlet 23 and a second outlet 30, and the two outlets are located in the same plane. Among them, the outer end of the first outlet 23 is threadedly connected with the first angle valve 21, and the outer end of the first angle valve 21 is threadedly connected with the first copper nipple 22. The outer end of the second outlet 30 is threadedly connected with the fourth angle valve 31, the outer end of the fourth angle valve 31 is threadedly connected with the first angle valve one-way valve 32 (here the one-way valve only allows liquid to flow out), and the outer end of the first angle valve one-way valve 32 is threadedly connected with the second copper nipple 33. Similarly, the lower cover plate 12 is provided with a liquid passage 27 in the middle, the liquid passage 27 communicates with the third outlet and the fourth outlet, the third outlet is threadedly connected with the second angle valve 28, and the second angle valve 28 is arranged in the same way as the first angle valve 21; the fourth outlet is threadedly connected with the third angle valve 29, and the third angle valve 29 is arranged in the same way as the fourth angle valve 31, and the outer end thereof is threadedly connected with the second angle valve one-way valve (here the one-way valve only allows liquid to flow in).

[0030] Further, the top plate 9 is connected with several triangular supports 16, the triangular supports 16 are connected with the support plates 8, one end of the support plates 8 is provided with the fixed supports 17, and the driving assembly 4 is arranged to be radially limited via the fixed supports 17.

[0031] In another preferred embodiment, the rectifying piece 5 includes four pipes 38 arranged side by side two by two, each pipe 38 is connected with a three-way water distributor at both ends, and each pipe 38 is provided with a one-way valve. Preferably, each pipe 38 is connected with the one-way valve at one end and connected with the three-way water distributor at the other end via the connector 39. The rectifying piece 5 is fixed on the track 7 via the plurality of pipe clamps 6, and the track 7 is connected with the support plate 8. For example, the rectifying piece 5 includes the first three-way water distributor 35, the first one-way valve 36, the second one-way valve 37, the plurality of pipes 38, the plurality of connectors 39, the second three-way water distributor 40, the third three-way water distributor 41, the fourth three-way water distributor 44, the third one-way valve 42 and the fourth one-way valve 43. Among them, the first three-way water distributor 35 is connected with the first one-way valve 36 and the second one-way valve 37 through threads, the fourth three-way water distributor 44 is connected with the third one-way valve 42 and the fourth one-way valve 43 through threads, one end of the pipe 38 is connected with the one-way valve, and the other end is inserted and connected with the third three-way water distributor 41 and the fourth three-way water distributor 44 via the connector 39.

[0032] The working principle of one embodiment of the present application is as follows: the first angle valve 21, the second angle valve 28 and the rectifying piece 5 are connected with the measured flow meter via the pipe, the third angle valve 29 is connected with the water supplement tank, and the fourth angle valve 31 is connected with the water storage tank. In this embodiment, when the cylinder body 11 is filled with fluid, the pipe 38 is connected and sealed, the rotation speed of the motor 1 is adjusted to drive the ball screw 20, so that the piston 24 reciprocates in the water storage cavity 26 to generate constant flow, the pipe 38 system realizes liquid circulation and self-provisioning through the rectifying piece 5 and the external water storage tank, and the rectifying piece 5 ensures that the fluid flowing through the flow meter is constant in direction. The following will be described in the direction of the movement of the piston 24:

[0033] When the piston 24 moves upward, the motor 1 reverses to reduce the actual rotating speed through the speed reducer 2, drives the ball screw 20 to move upward through the coupling 3, the fourth angular valve 31 of the upper cover plate 10 is closed, the first angular valve 21 is opened, the second angular valve 28 and the third angular valve 29 of the lower cover plate 12 are opened. The fluid moves upward under the pushing of the piston 24, the flow path of the fluid is: the first outlet 23→the first angular valve 21→the fourth three-way water distributor 44→the fourth one-way valve 43→the second three-way water distributor 40→the flowmeter A end→the flowmeter B end→the third three-way water distributor 41→the second one-way valve 37→the first three-way water distributor 35→the second angular valve 28, the rodless cavity absorbs water from the water tank to make up the volume difference. When the piston 24 moves downward, the motor 1 rotates to drive the ball screw 20 to move downward, the second angular valve 28 of the lower cover plate 12 is opened, the third angular valve 29 remains opened, the first angular valve 21 and the fourth angular valve 31 of the upper cover plate 10 are opened. The fluid moves downward under the pushing of the piston 24, the flow path of the fluid is: the third outlet→the second angular valve 28→the first three-way water distributor 35→the first one-way valve 36→the flowmeter A end→the flowmeter B end→the third three-way water distributor 41→the third one-way valve 42→the fourth three-way water distributor 44→the first angular valve 21→the first outlet 23, the excess fluid flows into the water tank through the second outlet 30.

[0034] The above are only the preferred embodiments of the present application, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical scheme belonging to the idea of the present application is within the protection scope of the present application.

Claims

1. A constant flow liquid supply device for flow meter calibration, characterized by, The utility model relates to a water circulating system, comprising: a cylinder having a water storage cavity; a piston configured in the water storage cavity and sealed with the inner wall of the water storage cavity, so that the water storage cavity is divided into a rod cavity and a rodless cavity; the piston is driven by a driving assembly to reciprocate along the axial direction of the cylinder; a flow rectifying member having a first flow path and a second flow path, and the first flow path and the second flow path flow through the flow meter in the same direction; wherein the rod cavity is provided with a first outlet and a second outlet, the rodless cavity is provided with a third outlet and a fourth outlet, the first outlet is connected with the water inlet end of the first flow path or the water outlet end of the second flow path, the second outlet is connected with the water outlet end of the first flow path or the water inlet end of the second flow path, the third outlet is connected with the water outlet end of the first flow path or the water inlet end of the second flow path, and the fourth outlet is connected with the water supplement tank to supplement the liquid in the rodless cavity, so that the volume of the liquid in the water storage cavity is constant, and the circulation of the liquid is realized.

2. The constant flow liquid supply device for flow meter calibration according to claim 1, wherein The driving assembly comprises a motor, a speed reducer, a shaft coupling and a ball screw, one end of the ball screw is inserted into the piston, and the other end is sequentially connected with the shaft coupling, the speed reducer and the motor.

3. The constant flow liquid supply device for flow meter calibration according to claim 1, wherein The cylinder is provided with a top plate, an upper cover plate, a bottom plate and a lower cover plate, the top plate and the upper cover plate are arranged at the upper end of the cylinder, the upper cover plate is provided with the first outlet and the second outlet, the bottom plate and the lower cover plate are arranged at the lower end of the cylinder, and the lower cover plate is provided with the third outlet and the fourth outlet.

4. The constant flow liquid supply device for flow meter calibration according to claim 3, wherein A first angle valve one-way valve is arranged between the second outlet and the water storage tank, and a second angle valve one-way valve is arranged between the fourth outlet and the water supplement tank, so that the liquid flows in one direction.

5. The constant flow liquid supply device for flow meter calibration according to claim 3, wherein A plurality of triangular supports are connected to the top plate, a support plate is connected to the triangular supports, one end of the support plate is provided with a fixed support, and the driving assembly is arranged to be radially limited through the fixed support.

6. The constant flow liquid supply device for flow meter calibration according to claim 1, wherein The flow rectifying member comprises four pipelines arranged side by side, each pipeline is connected with a three-way water distributor at both ends, and each pipeline is provided with a one-way valve.

7. The constant flow liquid supply device for flow meter calibration according to claim 6, wherein One end of each pipeline is connected with a one-way valve, and the other end is connected with a three-way water distributor through a connector.

8. The constant flow liquid supply device for flow meter calibration according to claim 5, wherein The flow rectifying member is fixed on a track through a plurality of pipe clamps, and the track is connected with the support plate.

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