A high-precision flow meter

Abstract

The utility model provides a high-precision flowmeter, which belongs to the technical field of flowmeters. It solves the problem that the flow scale of the existing flowmeter is unequally spaced and the reading accuracy is low. The high-precision flowmeter mainly includes a flow indicator cover, a flow valve body and a control valve seat; a flow guide rod is arranged inside the flow indicator cover, a spring pressure plate and a reset spring are sleeved on the upper end of the flow guide rod, and a flow impact part is formed at the bottom; the flow valve body is formed with a clamping ring limiting part, a valve body water inlet and a water outlet pipe from top to bottom, and the inside of the water outlet pipe is a gradually expanding cavity, and its cavity slope gradually tilts outward from top to bottom, forming a flow gap with the outer wall of the flow impact part; the control valve seat is rotatably sleeved on the outside of the flow valve body, and a limiting clamping groove matching the clamping ring limiting part is opened on the inner wall, a metal clamping ring is installed inside, and a valve seat water inlet is opened at the middle section of the control valve seat. The utility model has the advantages of improving the flow reading accuracy, safety and reliability, flexibility and practicality.

Description

Technical Field

[0001] The utility model belongs to the technical field of flow meters, and particularly relates to a high-precision flow meter. Background Art

[0002] A flow meter is an instrument for measuring fluid flow. Its basic principle is to determine the flow rate based on the volume or mass of fluid passing through a flow channel per unit time.

[0003] According to a flowmeter disclosed in the patent number CN201921666157.2, to open the water inlet, the outer tube needs to be rotated so that the lower end of the outer tube moves upward to expose the water inlet. The valve column is arranged in the outer tube and the lower end blocks the water inlet. This arrangement enhances the safety of use and avoids unnecessary losses caused by accidental opening of the flowmeter. However, the flow scale on the indicator tube of the patent is unequally spaced, and the user has low accuracy when reading the flow value, which is easy to cause large errors in actual use. Utility Model Content

[0004] The purpose of the utility model is to provide a high-precision flow meter in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a high-precision flow meter, including a flow indicator cover, a connection protection sleeve, a flow valve body, a control valve seat and a lower joint;

[0006] The flow indicator cover is a hollow structure with an opening downward, and is made of transparent material as a whole. The outer wall thereof is provided with flow scales evenly distributed at equal intervals, and a flow guide rod is provided on the central axis inside. The top fixed sleeve of the flow guide rod is provided with a spring pressure plate, and a return spring is installed around the flow guide rod below the spring pressure plate;

[0007] The lower end of the flow indicating cover is connected with the upper end of the flow valve body, the flow guide rod extends downward and penetrates the inside of the flow valve body, and a flow impact part is formed by convexly protruding in the bottom circumferential direction; the flow valve body is formed with a valve body outer thread on the outer side wall below the connection part with the flow indicating cover, and a clamping ring limiting part is formed below the valve body outer thread, and the clamping ring limiting part includes a limiting step, a limiting inclined surface and a blocking ring from top to bottom in sequence; a plurality of valve body water inlets are opened circumferentially on the flow valve body below the clamping ring limiting part, and a water outlet pipe is provided below the water inlet of the valve body, and the inside of the water outlet pipe is a gradually expanding cavity, and its cavity inclined surface gradually inclines outwards from top to bottom, and the flow impact part can move up and down in the gradually expanding cavity, and a flow gap is formed between its outer side wall and the cavity inclined surface;

[0008] The control valve seat is sleeved on the outside of the flow valve body, and a valve seat internal thread is formed on the inner side wall of the upper end thereof, and the control valve seat is rotatably connected to the flow valve body through the cooperation of the valve seat internal thread and the valve body external thread; a limit clamping groove is provided inwardly on the inner side wall of the control valve seat below the valve seat internal thread, and a metal clamping ring is installed in the limit clamping groove; a plurality of valve seat water inlets are provided in the circumferential direction at the middle section of the control valve seat;

[0009] The connection protection sleeve is arranged on the outside of the connection between the flow valve body and the control valve seat, and the lower joint is fixedly connected to the outside of the water outlet pipe of the flow valve body and extends upward to be connected to the bottom of the control valve seat.

[0010] In the above-mentioned high-precision flow meter, the lower end of the flow indicator cover is formed with an indicator cover external thread, the upper end of the flow valve body is formed with an annular groove around the flow guide rod, and the inner side wall of the outer ring of the annular groove is formed with a valve body internal thread, and the lower end of the flow indicator cover is fixedly connected to the upper end of the flow valve body by a threaded connection.

[0011] In the above-mentioned high-precision flow meter, the limit step is reduced inwardly compared to the pipe diameter at the outer thread of the valve body, the limit slope is connected to the limit step upward, the pipe diameter gradually expands downward, and the bottom of the limit slope protrudes outward to form a blocking ring.

[0012] In the above-mentioned high-precision flow meter, the flow valve body is provided with valve body sealing grooves below the blocking ring and at both upper and lower ends of the valve body water inlet, and a sealing ring is installed in the valve body sealing groove.

[0013] In the above-mentioned high-precision flow meter, the control valve seat is provided with a valve seat sealing groove at the bottom, and a sealing ring is also installed in the valve seat sealing groove.

[0014] In the above-mentioned high-precision flow meter, the flow valve body and the control valve seat are integrally formed.

[0015] In the above-mentioned high-precision flow meter, the lower joint is a universal joint and does not require matching settings.

[0016] Compared with the prior art, the high-precision flow meter provided by the utility model has the following advantages: 1. When the flow meter is working, the flow impact part will drop after being impacted by the liquid. By adjusting the taper ratio of the cavity slope on the flow valve body, the flow gap will be enlarged as the liquid flow rate increases, ensuring that the flow guide rod drops evenly as the liquid flow rate increases, so that the flow scale presents an equidistant scale, greatly improving the flow reading accuracy;

[0017] 2. The clamping ring limit part, the metal clamping ring and the limit slot are matched to ensure that the flow valve body and the control valve seat of the flow meter cannot be disassembled after installation, so as to prevent the two from loosening and falling off and affecting actual use;

[0018] 3. By rotating the control valve seat to make it move up and down on the outside of the flow valve body, the water inlet of the valve seat and the water inlet of the valve body cooperate with each other to determine the switch of the flow meter and the flow rate passing through, thereby enhancing the safety and practicality of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the structural diagram of the high-precision flow meter;

[0020] Figure 2 This is the structural cross-sectional view of this high-precision flow meter;

[0021] Figure 3 yes Figure 2 A magnified view of the structure at the middle circle A;

[0022] Figure 4 It is a structural schematic diagram of the flow valve body in this high-precision flow meter;

[0023] Figure 5 It is a structural schematic diagram of the control valve body in this high-precision flow meter.

[0024] In the above figure, 100, flow indicator cover; 110, flow guide rod; 111, spring pressure plate; 112, return spring; 113, flow impact part; 120, external thread of indicator cover; 130, flow scale; 200, connection protection cover;

[0025] 300, flow valve body; 310, annular groove; 311, valve body inner thread; 320, valve body outer thread; 330, clamp ring limiter; 331, limit step; 332, limit slope; 333, blocking ring; 340, valve body water inlet; 350, water outlet; 351, gradually expanding cavity; 352, cavity slope; 353, flow gap; 360, valve body sealing groove; 370, sealing ring;

[0026] 400, control valve seat; 410, valve seat internal thread; 420, limit clamping groove; 421, metal clamping ring; 430, valve seat water inlet; 440, valve seat sealing groove; 500, lower joint. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figures 1 to 5As shown, the high-precision flow meter includes, from top to bottom, a flow indicator cover 100, a flow valve body 300, a control valve seat 400 and a lower joint 500. The lower end of the flow indicator cover 100 is connected to the upper end of the flow valve body 300, and the control valve seat 400 is sleeved on the outside of the flow valve body 300 and is rotatably connected to the flow valve body 300.

[0029] The lower joint 500 is fixedly connected to the outside of the flow valve body 300, and extends upward to be connected to the bottom of the control valve seat 400. Compared with the prior art, the lower joint 500 of the utility model adopts a universal joint, which can basically be fully applicable when the specifications and dimensions are the same, and no additional matching settings are required; the outer side of the connection between the flow valve body 300 and the control valve seat 400 is provided with a connection protection sleeve 200, and the connection protection sleeve 200 can protect the connection between the flow valve body 300 and the control valve seat 400 from pollution when the control valve seat 400 is rotated and adjusted.

[0030] like Figure 1 to Figure 2 As shown, the flow indicator cover 100 is a hollow structure with an opening downward, and a vertical flow guide rod 110 is arranged on the central axis inside the cover. The flow guide rod 110 extends downward and penetrates the inside of the flow valve body 300, and a flow impact portion 113 is formed by convexly protruding from the bottom. A spring pressure plate 111 is sleeved and fixed on the top of the flow guide rod 110, and a return spring 112 is installed around the flow guide rod 110 below the spring pressure plate 111, and one end of the return spring 112 is fixed to the bottom of the spring pressure plate 111, and the other end is against the top of the flow valve body 300.

[0031] The flow indicator cover 100 is made of waterproof and transparent material, and is provided with flow scales 130 evenly distributed at equal intervals on the outer wall, so that the user can read accurately. When the return spring 112 is compressed, the spring pressure plate 111 descends in the flow indicator cover 100, and the flow scale 130 corresponding to its position is the flow reading of the flow meter at this time.

[0032] like Figures 2 to 4 As shown, the flow valve body 300 is integrally formed. The lower end of the flow indicator cover 100 is formed with an indicator cover external thread 120, and the upper end of the flow valve body 300 is formed with an annular groove 310 around the flow guide rod 110. The inner ring top of the annular groove 310 abuts against the return spring 112, and the inner side wall of the outer ring is formed with a valve body internal thread 311. The indicator cover external thread 120 and the valve body internal thread 311 cooperate with each other so that the lower end of the flow indicator cover 100 and the upper end of the flow valve body 300 are fixedly connected through a threaded connection.

[0033] The flow valve body 300 is formed with a valve body outer thread 320 on the lower outer wall of the connection portion with the flow indicating cover 100, and a clamping ring limiting portion 330 is formed below the valve body outer thread 320. The clamping ring limiting portion 330 includes a limiting step 331, a limiting slope 332 and a blocking ring 333 from top to bottom. The limiting step 331 is reduced inwardly compared to the pipe diameter at the valve body outer thread 320, the limiting slope 332 is connected to the limiting step 331 upward, and the pipe diameter gradually expands downward, and the bottom of the limiting slope 332 protrudes outward to form a blocking ring 333.

[0034] Below the clamping ring limiting portion 330, a plurality of valve body water inlets 340 are opened circumferentially on the flow valve body 300. Below the valve body water inlet 340 is a water outlet pipe 350. The interior of the water outlet pipe 350 is a gradually expanding cavity 351, and its cavity slope 352 gradually tilts outward from top to bottom. The flow impact portion 113 is arranged at the center of the gradually expanding cavity 351, and a flow gap 353 is formed between its outer wall and the cavity slope 352.

[0035] When the flow meter is working, the liquid flows in from the water inlet 340 of the valve body and impacts the flow impact part 113 downward, and the flow impact part 113 then drops. However, due to the influence of the elastic force of the reset spring 112, the faster the liquid flow rate, the greater the resistance of the flow impact part 113 to the liquid. Therefore, the flow meter scale under the prior art is usually unequally spaced, and the reading accuracy is low. The utility model coordinates and adjusts the taper ratio of the cavity inclined surface 352 on the flow valve body 300, so that when the liquid flow rate is faster, the flow gap 353 is also enlarged, and the flow passing through the flow gap 353 is also increased, maintaining the lifting speed of the flow guide rod 110 proportional to the liquid flow rate, so that the flow scale 130 presents an equidistant scale, greatly improving the flow reading accuracy. After actual testing, the utility model can increase the flow accuracy error from the conventional ±10% to 15% to ±2% to 5%.

[0036] Further explanation, the flow valve body 300 is provided with a valve body sealing groove 360 ​​inwardly below the blocking ring 333 and at both ends of the valve body water inlet 340, and a sealing ring 370 is installed in the valve body sealing groove 360. The valve body sealing groove 360 ​​cooperates with the sealing ring 370 to circumferentially seal the contact surface between the flow valve body 300 and the control valve seat 400 to prevent water seepage inside the upper end of the flow meter.

[0037] like Figure 2 and Figure 5 As shown, the control valve seat 400 is also integrally formed. A valve seat internal thread 410 is formed on the inner side wall of the upper end of the control valve seat 400. The valve seat internal thread 410 cooperates with the valve body external thread 320 so that the control valve seat 400 can be rotatably connected to the flow valve body 300. A plurality of valve seat water inlets 430 are circumferentially opened at the middle section of the control valve seat 400.

[0038] The valve seat 400 can be rotated to move up and down outside the flow valve body 300, thereby controlling whether the water inlet of the valve seat 400 overlaps with the water inlet 340 of the valve body and the size of the overlapping part, that is, controlling the switch of the flow meter and the size of the flow passing through. This structural setting can enhance the safety of the flow meter and can adjust the flow passing through according to actual application requirements, which is flexible and practical.

[0039] A limit slot 420 is provided on the inner wall of the control valve seat 400 below the inner thread 410 of the valve seat, and a metal collar 421 is installed in the limit slot 420. When the flow meter is in the closed state, the limit slot 420 and the limit step 331 limit the metal collar 421 together; when the control valve seat 400 rotates and descends, the limit slot 420 and the metal collar 421 also descend accordingly, and the metal collar 421 is squeezed by the limit inclined surface 332 with a gradually increasing pipe diameter at the collar limit portion 330, so that it is closer to the limit slot 420, until the blocking ring 333 at the bottom is blocked and limited by the metal collar 421. The collar limit portion 330, the metal collar 421 and the limit slot 420 cooperate with each other, so that the flow valve body 300 and the control valve seat 400 of the flow meter cannot be disassembled after assembly, to prevent the two from loosening and falling off and affecting actual use.

[0040] Further, the control valve seat 400 has a valve seat sealing groove 440 at the bottom, and a sealing ring 370 is also installed in the valve seat sealing groove 440. The valve seat sealing groove 440 cooperates with the top inner wall of the lower joint 500 through the sealing ring 370 to play a role of sealing and connecting and fixing.

[0041] The working principle of the utility model is as follows: when the flow meter is in the closed state, the valve seat water inlet 430 and the valve body water inlet 340 are misaligned with each other, and liquid cannot flow into them. When the flow meter is in the open state, the valve seat water inlet 430 and the valve body water inlet 340 are overlapped by rotating the control valve seat 400 according to the actual application situation, and the liquid flows in from the overlapping part, and impacts the flow impact part 113 at the bottom of the flow guide rod 110 downward, and the flow guide rod 110 then drops, thereby driving the spring pressure plate 111 at the top of the flow guide rod 110 to drop, and according to the flow scale 130 corresponding to the descending position of the spring pressure plate 111, the liquid flow rate passing through the flow meter at this time is read.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although various terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A high-precision flow meter, comprising a flow indicator cover (100), a connection protection sleeve (200), a flow valve body (300), a control valve seat (400) and a lower joint (500); characterized in that: The flow indicator cover (100) is a hollow structure with an opening facing downward, and is made of a transparent material as a whole. The outer wall thereof is provided with flow scales (130) evenly distributed at equal intervals, and a flow guide rod (110) is provided on the central axis inside. The top fixed sleeve of the flow guide rod (110) is provided with a spring pressure plate (111), and a return spring (112) is installed around the flow guide rod (110) below the spring pressure plate (111); The lower end of the flow indicator cover (100) is connected to the upper end of the flow valve body (300); the flow guide rod (110) extends downward and penetrates the interior of the flow valve body (300), and is provided with a flow impact portion (113) protruding in the circumferential direction at the bottom; the flow valve body (300) is provided with a valve body outer thread (320) on the outer side wall below the portion connected to the flow indicator cover (100); a clamping ring limiting portion (330) is formed below the valve body outer thread (320); the clamping ring limiting portion (330) comprises, from top to bottom, a limiting step (331), a limiting step (332), and a limiting step (333). A plurality of valve body water inlets (340) are provided circumferentially on the flow valve body (300) below the clamping ring limiting portion (330); a water outlet pipe (350) is provided below the valve body water inlet (340); the interior of the water outlet pipe (350) is a gradually expanding cavity (351); the cavity inclined surface (352) of the cavity gradually inclines outward from top to bottom; the flow impact portion (113) can move up and down in the gradually expanding cavity (351); a flow gap (353) is formed between the outer wall of the cavity and the cavity inclined surface (352); The control valve seat (400) is sleeved on the outside of the flow valve body (300), and a valve seat internal thread (410) is formed on the inner side wall of the upper end thereof, and the control valve seat (400) is rotatably connected to the flow valve body (300) by the cooperation of the valve seat internal thread (410) and the valve body external thread (320); a limit clamping groove (420) is provided inwardly on the inner side wall of the control valve seat (400) below the valve seat internal thread (410), and a metal clamping ring (421) is installed in the limit clamping groove (420); a plurality of valve seat water inlets (430) are provided in the circumferential direction at the middle section of the control valve seat (400); The connection protection sleeve (200) is sleeved on the outside of the connection between the flow valve body (300) and the control valve seat (400), and the lower joint (500) is fixedly connected to the outside of the water outlet pipe (350) of the flow valve body (300) and extends upward to be connected to the bottom of the control valve seat (400).

2. A high-precision flow meter according to claim 1, characterized in that: The lower end of the flow indicator cover (100) is formed with an indicator cover external thread (120), the upper end of the flow valve body (300) is formed with an annular groove (310) around the flow guide rod (110), and the inner side wall of the outer ring of the annular groove (310) is formed with a valve body internal thread (311), and the lower end of the flow indicator cover (100) is fixedly connected to the upper end of the flow valve body (300) through a threaded connection.

3. A high-precision flow meter according to claim 1, characterized in that: The limiting step (331) is reduced inwardly compared to the pipe diameter at the outer thread (320) of the valve body, the limiting slope (332) is connected to the limiting step (331) upwardly, and the pipe diameter gradually increases downwardly, and the bottom of the limiting slope (332) protrudes outwardly to form a blocking ring (333).

4. A high-precision flow meter according to claim 1, characterized in that: The flow valve body (300) is provided with valve body sealing grooves (360) below the blocking ring (333) and at both upper and lower ends of the valve body water inlet (340) facing inward, and a sealing ring (370) is installed in the valve body sealing groove (360).

5. A high-precision flow meter according to claim 1, characterized in that: The control valve seat (400) is provided with a valve seat sealing groove (440) at the bottom, and a sealing ring (370) is also installed in the valve seat sealing groove (440).

6. A high-precision flow meter according to claim 1, characterized in that: The flow valve body (300) and the control valve seat (400) are integrally formed.

7. A high-precision flow meter according to claim 1, characterized in that: The lower joint (500) is a universal joint and does not require any matching configuration.

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