A water meter with low pressure loss and wide range

Abstract

The present invention provides a water meter with low pressure loss and wide range, comprising a casting integrally formed shell, a movement inserted in the shell, the inner wall of the shell shrinks inward to form a dividing ring, the dividing ring divides the inner part of the shell into a water outlet chamber and a water storage chamber, and the inner wall of the water storage chamber is symmetrically provided with a pair of diversion protrusions, the diversion protrusions extend downward in a streamlined manner from the water inlet to the direction close to the water outlet until the bottom of the inner wall of the shell shrinks towards each other. The movement comprises a lower deflector clamped on the dividing ring, an upper deflector clamped on the upper end of the lower deflector, an impeller is arranged in the upper deflector and the lower deflector, the upper end of the upper deflector is embedded in the lower end surface of the flange cover, a counter is fixed on the upper end surface of the flange cover, the counter penetrates the flange cover and is connected to the movement, a cylindrical water filter cartridge with both upper and lower ends opened is sleeved on the outer periphery of the lower deflector, a plurality of water holes are evenly arranged on the side wall of the water filter cartridge, and the lower ends of the lower deflector and the water filter cartridge abut against the bottom end of the inner wall of the shell.

Description

Technical Field

[0001] The invention relates to the technical field of water meters, and in particular to a water meter with low pressure loss and wide measuring range. Background Art

[0002] A water meter is an instrument for measuring water flow. When designing a water meter, the following parameters should be taken into consideration: minimum flow (Q1): the minimum flow at which the water meter's indication is required to meet the maximum allowable error; normal flow (Q3): the maximum flow under rated working conditions; boundary flow (Q1): the flow that appears between the normal flow Q3 and the minimum flow Q1, dividing the flow range into two zones, the "high zone" and the "low zone", each with a specific maximum allowable error; overload flow (Q4): the maximum flow at which the water meter is required to meet the maximum allowable error requirements in a short period of time and then maintain the metering characteristics under rated working conditions; pressure loss (Δp): the head loss caused by the presence of a water meter in the pipeline at a given flow.

[0003] In the traditional water meter design, a water filter sleeve is also sleeved on the outside of the lower deflector, and the water filter sleeve is clamped on the chamber ring in the middle of the shell. The lower end of the water filter sleeve is spaced from the bottom end of the inner wall of the shell. Water flows into the lower deflector from the outer periphery and bottom of the water filter sleeve and then drives the impeller to rotate to count the water flow. However, this design has the following problems:

[0004] 1. Water flows into the water storage chamber from the water inlet. More water flows upward from the side close to the water inlet, thereby driving the impeller to rotate. The water flow rate on the side away from the water inlet is relatively slow, resulting in uneven force on the impeller during rotation, which is prone to deflection or aggravated wear.

[0005] 2. During the water flow process, more water flows from the lower end of the water filter jacket into the lower guide device to lift the impeller, which brings about a large pressure loss and causes the water meter's rated value of the common flow rate and the threshold of the overload flow rate to decrease. In order to increase the rated value of the common flow rate and the threshold of the overload flow rate, the water meter shell is usually enlarged, but this will increase the rated value of the minimum flow rate, which is not conducive to the monitoring of the small flow state. However, if there is no gap between the water filter jacket and the bottom of the inner wall of the shell, the water flow on the side away from the water inlet will be more turbulent, and the water flow entering the movement will be small, resulting in unstable impeller deflection and further aggravating the pressure loss difference.

[0006] 3. When water flows into the water meter, it is mostly turbulent, the water flow area is large, and the pressure loss difference is large. In industrial production, it will have a significant impact on the water pressure and the service life of the water meter. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a water meter with low pressure loss and wide range, which is implemented as follows:

[0008] A water meter with low pressure loss and wide range, comprising a casting integrally formed shell, a movement inserted in the shell, a water inlet and a water outlet with colinear axes respectively opened on both sides of the shell, the inner wall of the shell shrinks inwardly to form a dividing ring, the dividing ring divides the interior of the shell into a water outlet chamber and a water storage chamber from top to bottom, the inner wall of the water storage chamber is symmetrically provided with a pair of guide protrusions, the guide protrusions extend downward in a streamlined manner from the water inlet toward the direction close to the water outlet until they shrink towards the bottom of the inner wall of the shell, and the guide protrusions divide the water storage chamber into a near water part and a far water part from the direction gradually away from the water inlet;

[0009] The movement includes a lower deflector snap-fitted on the dividing chamber ring, an upper deflector snap-fitted on the upper end of the lower deflector, impellers are arranged in the upper deflector and the lower deflector, a flange cover is detachably arranged at the upper end opening of the shell, the upper end of the upper deflector is embedded in the lower end surface of the flange cover, a counter is fixed on the upper end surface of the flange cover, the counter passes through the flange cover and is connected to the movement, a cylindrical water filter cartridge with openings at both upper and lower ends is sleeved on the outer periphery of the lower deflector, a plurality of water holes are evenly arranged on the side walls of the water filter cartridge, and the lower ends of the lower deflector and the water filter cartridge abut against the bottom end of the inner wall of the shell.

[0010] As a further improvement, the shell extends outward at the water inlet and the water outlet to form a water inlet pipe and a water outlet pipe respectively.

[0011] As a further improvement, the chamber ring specifically includes a connecting plate extending inwardly from the inner wall of the shell, the inner opening of the connecting plate bulges upward to form a ring-shaped placement platform at a position where the axes of the water inlet / water outlet are coplanar, and the inner wall of the placement platform shrinks inwardly to form a step portion, and the movement is supported on the step portion;

[0012] The connecting plate is arranged to be streamlined and inclined downward from a side close to the water inlet toward a direction close to the water outlet. The side of the connecting plate close to the water inlet is connected to the upper end of the water inlet, and the side of the connecting plate close to the water outlet is connected to the lower end of the water outlet.

[0013] As a further improvement, the cross section of the guide protrusion includes a bottom line that always matches the inner wall of the shell, and two ends of the bottom line extend in a concave curve in a direction gradually away from the inner wall of the shell to form two side lines, and the ends of the two side lines away from the bottom line are connected by a smooth top line;

[0014] The side line close to the far water part is in the shape of a quarter arc, and the top line is inclined toward the near water part;

[0015] The guide protrusion is formed by scanning a pair of symmetrical molding lines extending downward from the water inlet in a streamlined manner toward the water outlet until the bottom of the inner wall of the shell and then approaching each other, and the ends of the molding lines are in contact with the outer wall of the water filter cartridge.

[0016] As a further improvement, the diameter of the water inlet is defined as d, the starting end of the forming line is located at the water inlet and is 2 / 9 to 1 / 3d away from the upper end of the water inlet, the inner diameter of the shell is defined as D, the end of the forming line is located at the bottom of the inner wall of the shell and is 1 / 2D away from the water inlet.

[0017] As a further improvement, the guide protrusion specifically includes a water dividing portion arranged at the water inlet position, the water dividing portion extends in a direction away from the water inlet to form a spoiler portion, the side of the spoiler portion away from the water inlet extends in a streamlined manner to form a guide portion, and the lower ends of the two guide portions are connected to the bottom of the inner wall of the shell and move toward each other to form a return water portion.

[0018] As a further improvement, the distance between the spoiler and the connecting plate gradually decreases, and the distance between the guide portion and the connecting plate gradually increases.

[0019] As a further improvement, the lower deflector is in the shape of an inverted funnel, the outer wall of the lower deflector is in the shape of a smooth curved surface, and a plurality of diverter plates are arranged in a circumferential array on the outer wall of the lower deflector;

[0020] A plurality of flushing holes are arranged on the upper end surface of the lower flow guide.

[0021] As a further improvement, a plurality of overflow notches are provided at the bottom end of the lower deflector, and a downwardly concave arc surface is provided at the bottom of the inner wall of the outer shell at a position corresponding to the lower deflector.

[0022] As a further improvement, a communication module is provided in the counter, and the communication module is communicatively connected with a remote monitoring center.

[0023] The beneficial effects of the present invention are:

[0024] 1. When water flows in a pipe, it is generally in a laminar state. Due to the viscosity of the liquid itself, the flow rate of each layer of the water flow gradually increases from the direction away from the pipe wall until it reaches the maximum at the axis of the pipe. When entering the water storage chamber of the water meter from the water inlet, a large turbulence will be formed, resulting in an increase in the pressure loss difference. The present invention symmetrically arranges a pair of guide protrusions on the inner wall of the water storage chamber. The guide protrusions extend downward in a streamlined manner from the water inlet toward the direction close to the water outlet until they contract towards the bottom of the inner wall of the shell. The guide protrusions separate the water storage chamber from the direction gradually away from the water inlet into a near-water part and a far-water part. The guide protrusions guide the liquid entering the water storage chamber, quickly smoothing the turbulence into a laminar flow and reducing the pressure loss difference.

[0025] At the same time, since some sections of the guide protrusion extend downward in a streamlined shape to the bottom of the inner wall of the shell, the guide acceleration is achieved at low flow rates to reduce the value required for the minimum flow rate Q1. At high flow rates, the liquid is blocked to cause backflow and turbulence to disturb each other and convert kinetic energy into pressure potential energy, avoiding impeller failure due to excessively high flow rates, and also reducing the pressure loss difference.

[0026] 2. By placing the lower end of the lower deflector and the filter cartridge against the bottom of the inner wall of the housing, the deflector protrusion guides more water into the far water portion in a laminar flow, eliminating the need to enter the core from the lower end of the filter cartridge to avoid a large pressure loss difference due to a small water flow at the end far from the water inlet, thereby reducing the water flow entering the core from the lower end of the lower deflector and thus reducing the pressure loss difference. At the same time, the amount of water that can enter the impeller from the lower deflector to flush the impeller is increased, optimizing the impeller's sensitivity to the water flow, reducing the value required for the minimum flow Q1, and further widening the range. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall forward cross-sectional structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the explosion structure of the movement of the present invention.

[0029] Figure 3 It is a schematic diagram of the front cross-sectional structure of the shell of the present invention.

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the housing of the present invention in a front cross-sectional view.

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the housing of the present invention in a front cross-sectional view.

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of the movement of the present invention observed from below.

[0033] Figure 7 It is a schematic diagram of the partially enlarged structure of the guide protrusion of the present invention.

[0034] Figure 8 It is a schematic diagram of the side cross-sectional structure of the shell of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0036] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0037] like Figure 1-Figure 8 As shown, a water meter with low pressure loss and wide range comprises a casting integrally formed shell 1, a movement 2 is inserted in the shell 1, a water inlet 11 and a water outlet 12 with co-axial axes are respectively opened on both sides of the shell 1, the inner wall of the shell 1 shrinks inwardly to form a dividing ring 14, the dividing ring 14 divides the interior of the shell 1 into a water outlet chamber 15 and a water storage chamber 16, and the inner wall of the water storage chamber 16 is symmetrically provided with a pair of guide protrusions 13, the guide protrusions 13 extend downward in a streamlined manner from the water inlet 11 toward the direction close to the water outlet 12 until the bottom of the inner wall of the shell 1 and then shrink towards each other, and the guide protrusions 13 divide the water storage chamber 16 into a near water part and a far water part from the direction gradually away from the water inlet 11;

[0038] The movement 2 includes a lower deflector 21 which is snap-fitted to the chamber dividing ring 14, an upper deflector 22 is snap-fitted to the upper end of the lower deflector 21, an impeller 23 is arranged in the upper deflector 22 and the lower deflector 21, a flange cover 24 is detachably arranged at the upper end opening of the shell 1, the upper end of the upper deflector 22 is embedded in the lower end surface of the flange cover 24, a counter 25 is fixed on the upper end surface of the flange cover 24, the counter 25 passes through the flange cover 24 and is connected to the movement 2, a cylindrical water filter cartridge with openings at both upper and lower ends is sleeved on the outer periphery of the lower deflector 21, a plurality of water holes 261 are evenly spaced on the side walls of the water filter cartridge, the lower ends of the lower deflector 21 and the water filter cartridge are abutted against the bottom end of the inner wall of the shell 1.

[0039] As a further improvement, the shell 1 extends outward at the water inlet 11 and the water outlet 12 to form a water inlet pipe 111 and a water outlet pipe 121 .

[0040] like Figure 1 , 2 -4 and Figure 8 As shown, as a further improvement, the dividing chamber ring 14 specifically includes a connecting plate 143 extending inwardly from the inner wall of the shell 1, and the inner opening of the connecting plate 143 bulges upward to form an annular placement platform 141 at the coplanar position of the axis of the water inlet 11 / water outlet 12, and the inner wall of the placement platform 141 shrinks inwardly to form a step portion 142, and the movement 2 is supported on the step portion 142.

[0041] like Figure 3 as well as Figure 5 As shown, the connecting plate 143 is arranged in a streamlined downward inclination from the side close to the water inlet 11 toward the direction close to the water outlet 12, and the side of the connecting plate 143 close to the water inlet 11 is connected to the upper end of the water inlet 11, and the side of the connecting plate 143 close to the water outlet 12 is connected to the lower end of the water outlet 12. The connecting plate 143 is streamlined downward inclination and can cooperate with the guide protrusion 13 to guide the water flow, avoid excessive turbulence, and reduce the cross-sectional change of the flow channel, avoid the change of the kinetic energy of the water flow when the water pipe with a small inner diameter flows into the shell 1 with a large inner diameter, and further, the water flow entering the far water part can be guided to reduce the occurrence of turbulence.

[0042] like Figure 7As shown, as a further improvement, the cross-section of the guide protrusion 13 includes a bottom edge line 135 that always fits with the inner wall of the shell 1, and the two ends of the bottom edge line 135 extend in a concave curve in a direction gradually away from the inner wall of the shell 1 to form two side lines 136, and the ends of the two side lines 136 away from the bottom edge line 135 are connected by a smooth top line 137; wherein, the side line 136 close to the far water part is in the shape of a 1 / 4 circular arc, and the top line 137 is inclined toward the near water part; the guide protrusion 13 is formed by scanning its cross section along a pair of symmetrical molding lines that extend downward in a streamlined manner from the water inlet 11 toward the water outlet 12 until the bottom of the inner wall of the shell 1 and then approach each other, and the end of the molding line is abutted against the outer wall of the water filter cartridge. The design here has the following advantages: 1. The concave curve of the side line 136 can reduce the collision turbulence that occurs when the water flow changes from flowing along the axis of the water inlet pipe 111 to flowing along the guide protrusion 13, and the cavity formed when the high-speed water flow encounters an obstacle, thereby ensuring that the far water part is always full of liquid, while reducing the turbulence generated inside the water storage chamber 16; 2. By setting the top line 137 to be inclined toward the near water part, the vortex generated when the water flow in the near water part collides with the guide protrusion 13 will wrap around the guide protrusion 13, reducing the outer diameter of the vortex and reducing the impact on the laminar flow at other positions.

[0043] like Figure 3 As shown, as a further improvement, the diameter of the water inlet 11 is defined as d, the starting end of the molding line is located at the position of the water inlet 11 and is 2 / 9 to 1 / 3d away from the upper end of the water inlet 11, the inner diameter of the shell 1 is defined as D, and the end of the molding line is located at the bottom of the inner wall of the shell 1 and is 1 / 2D away from the water inlet 11. If the starting end of the molding line is set too high, the turbulence of the water flow entering the far water part will increase. The water flow entering the far water part mainly comes from the high-speed direct inflow of the water flow in the pipeline, which cannot reduce the pressure loss difference, and the effect is worse than that of the traditional water meter; if the starting end of the molding line is set too low, it will cause the turbulence in the near water part to increase, which is equivalent to reversing the traditional water meter, and cannot form a better effect of reducing pressure loss.

[0044] like Figure 4As shown, as a further improvement, the diversion protrusion 13 specifically includes a water diversion portion 131 arranged at the position of the water inlet 11, the water diversion portion 131 extends in a direction away from the water inlet 11 to form a spoiler 132, the spoiler 132 extends in a streamlined manner on the side away from the water inlet 11 to form a diversion portion 133, and the lower ends of the two diversion portions 133 are connected to the bottom of the inner wall of the shell 1 and move towards each other to form a return water portion 134. Among them, the water diversion portion 131 guides the water flow into the near water portion and the far water portion respectively, the spoiler 132 forms a turbulent flow to consume as much turbulence and circulation as possible caused by the collision of the water flow and the diversion protrusion 13, and reduce the internal energy loss, the diversion portion 133 guides the water flow tending to laminar flow into the lower diverter 21, and the return water portion 134 ensures that the water flow entering the middle area of ​​the lower diverter 21 and the water flow difference between the near water portion and the far water portion are reduced.

[0045] like Figure 4 As shown, as a further improvement, the distance between the spoiler 132 and the connecting plate 143 is gradually reduced to accelerate the water flow to facilitate more water flow to enter the far water part, and the distance between the guide part 133 and the connecting plate 143 is gradually increased to slow down the water flow entering the far water part to avoid impact on the impeller 23 and reduce pressure loss.

[0046] like Figure 8 As shown, in order to ensure that the water flow entering the water storage chamber 16 can evenly enter the far water part and avoid the water flow forming a circulation around the lower deflector 21 and the water filter cylinder, as a further improvement, the middle part of the lower end of the water inlet 11 bulges upward to form a water dividing plate 17.

[0047] like Figure 1 , 2 as well as Figure 6 As shown, as a further improvement, the lower deflector 21 is in an inverted funnel shape, the outer wall of the lower deflector 21 is in a smooth arc shape, and a plurality of diverter plates 221 are arranged in a circumferential array on the outer wall of the lower deflector 21;

[0048] like Figure 6 As shown, a plurality of flushing holes 212 are provided on the upper end surface of the lower guide 21. When the water pressure is too high, the water flows into the lifting impeller 23 from the flushing holes 212 to prevent the impeller 23 from being damaged.

[0049] As a further improvement, the number of the flushing holes 212 is four and they are arranged in a circular array along the axis of the impeller 23, so that the water flow entering from the flushing holes 212 can smoothly lift the impeller 23 and generate turbulence to prevent the impeller 23 from over-rotating and causing reading errors.

[0050] As a further improvement, a plurality of overflow notches 213 are provided at the bottom end of the lower deflector 21 to ensure that there is sufficient water volume and water pressure to lift the impeller 23 , and a downwardly concave arc surface is provided at the bottom of the inner wall of the outer shell and at the corresponding position of the lower deflector 21 .

[0051] As a further improvement, a communication module is provided in the counter 25, and the communication module is communicatively connected with a remote monitoring center.

[0052] The above description is only a preferred embodiment of the present invention and is 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 water meter with low pressure loss and wide range, comprising a housing formed by casting in one piece, wherein a movement is inserted in the housing, characterized in that: A water inlet and a water outlet with colinear axes are respectively provided on both sides of the shell, and the inner wall of the shell shrinks inwardly to form a dividing ring, and the dividing ring divides the interior of the shell into a water outlet chamber and a water storage chamber from top to bottom, and the inner wall of the water storage chamber is symmetrically provided with a pair of guide protrusions, and the guide protrusions extend downward in a streamlined manner from the water inlet toward the direction close to the water outlet until they shrink toward the bottom of the inner wall of the shell, and the guide protrusions divide the water storage chamber into a near water part and a far water part in a direction gradually away from the water inlet; The movement comprises a lower deflector which is clamped on the chamber dividing ring, an upper deflector is clamped on the upper end of the lower deflector, an impeller is arranged in the upper deflector and the lower deflector, a flange cover is detachably arranged at the upper end opening of the shell, the upper end of the upper deflector is embedded in the lower end surface of the flange cover, a counter is fixed on the upper end surface of the flange cover, the counter passes through the flange cover and is connected to the movement, a cylindrical water filter cartridge with openings at both the upper and lower ends is sleeved on the outer periphery of the lower deflector, a plurality of water holes are evenly arranged on the side wall of the water filter cartridge, and the lower ends of the lower deflector and the water filter cartridge abut against the bottom end of the inner wall of the shell; The cross section of the guide protrusion includes a bottom line that is always in line with the inner wall of the shell, and two ends of the bottom line extend in a concave curve in a direction gradually away from the inner wall of the shell to form two side lines, and the ends of the two side lines away from the bottom line are connected by a smooth top line; The side line close to the far water part is in the shape of a quarter arc, and the top line is inclined toward the near water part; The guide protrusion is formed by scanning along a pair of symmetrical molding lines extending downward from the water inlet in a streamlined manner toward the water outlet until the bottom of the inner wall of the shell and then approaching each other, and the ends of the molding lines are close to the outer wall of the water filter cartridge; The diameter of the water inlet is defined as d, the starting end of the molding line is located at the water inlet and is 2 / 9 to 1 / 3d away from the upper end of the water inlet, the inner diameter of the shell is defined as D, the end of the molding line is located at the bottom of the inner wall of the shell and is 1 / 2D away from the water inlet; The diversion protrusion specifically includes a water diversion portion arranged at the water inlet, the water diversion portion extends in a direction away from the water inlet to form a flow spoiler, the side of the flow spoiler away from the water inlet extends in a streamlined manner to form a diversion portion, and the lower ends of the two diversion portions are connected to the bottom of the inner wall of the shell and move toward each other to form a water return portion; The chamber dividing ring specifically includes a connecting plate extending inwardly from the inner wall of the shell; The distance between the spoiler and the connecting plate gradually decreases, and the distance between the guide and the connecting plate gradually increases.

2. A water meter with low pressure loss and wide range as claimed in claim 1, characterized in that: The shell extends outward at the water inlet and the water outlet to form a water inlet pipe and a water outlet pipe.

3. A water meter with low pressure loss and wide range as claimed in claim 2, characterized in that: The inner opening of the connecting plate bulges upward to form a ring-shaped placement platform at a position where the axes of the water inlet / water outlet are coplanar, and the inner wall of the placement platform shrinks inward to form a step portion, and the movement is supported on the step portion; The connecting plate is arranged to be streamlined and inclined downward from a side close to the water inlet toward a direction close to the water outlet. The side of the connecting plate close to the water inlet is connected to the upper end of the water inlet, and the side of the connecting plate close to the water outlet is connected to the lower end of the water outlet.

4. A water meter with low pressure loss and wide range as claimed in claim 1, characterized in that: The lower deflector is in the shape of an inverted funnel, the outer wall of the lower deflector is in the shape of a smooth arc surface, and a plurality of diverter plates are arranged in a circumferential array on the outer wall of the lower deflector; A plurality of flushing holes are arranged on the upper end surface of the lower flow guide.

5. A water meter with low pressure loss and wide range as claimed in claim 4, characterized in that: A plurality of overflow notches are provided at the bottom end of the lower deflector, and a downwardly concave arc surface is provided at the bottom of the inner wall of the shell and at the corresponding position of the lower deflector.

6. A water meter with low pressure loss and wide range as claimed in claim 1, characterized in that: A communication module is arranged in the counter, and the communication module is connected to the remote monitoring center for communication.

Images