CN206905852U - A kind of type open type fluid switching device in the same direction - Google Patents

Abstract

The utility model discloses a co-directional open fluid switching device. The stepper motor in the utility model is connected with the rotating shaft through a shaft coupling; the disk has a slit capable of transmitting light and is installed on the rotating shaft; the first photoelectric converter and the second photoelectric converter are installed on the fixed bracket connected to the timing and frequency counting device; the first splitter plate and the second splitter plate are symmetrically installed on both sides of the rotating shaft, and pass through the diameter of the semi-cylindrical tube vertically to form the side closing plate of the semi-cylindrical tube; the rectification surface is semi-conical , the upper end is connected with the rotating shaft. By properly controlling the rotation of the stepping motor, driving the rotating shaft and driving the disc, the first diverter baffle, the second diverter baffle, the semi-cylindrical tube and the rectifying surface to rotate, the kinematic mechanism of the co-directional fluid switching device can be better realized. Switch fluids in the same direction of motion. The utility model greatly reduces the uncertainty introduced in the fluid switching process of the device, and improves the measurement accuracy of the liquid flow standard device.

Description

A co-directional open fluid switching device

technical field

The utility model relates to a co-direction open fluid switching device in a liquid flow device.

Background technique

In current metering technical institutions at home and abroad, there are mainly two types of fluid switching devices used in liquid flow standard devices: one is a closed fluid switching device; the other is a different direction open fluid switching device. These two fluid switching devices meet the value transmission requirements in the current detection and verification to a certain extent, but with the development of liquid flow measurement technology, the above-mentioned fluid switching devices can no longer meet the needs of instruments with higher and higher measurement accuracy. Therefore, more and more problems are exposed in use. For example, the fluid disturbance problem of the closed fluid switching device, when the closed fluid switching device suddenly switches the fluid, the fluid velocity and pressure in the pipeline will change sharply, resulting in strong fluid fluctuations, which will be along the The pipeline propagates to the pipeline inlet, thus causing disturbance of the fluid in a steady flow state, which in turn affects the metering performance of the flowmeter. Since the above-mentioned fluid disturbance problem is a serious defect that the closed switching device cannot overcome, the use of this type of fluid switching device in the liquid flow standard device is becoming less and less, and it is gradually replaced by the different direction open fluid that does not disturb the fluid. Switching device replaced.

Figure 1 shows the structural composition of the open fluid switching device of different orientations. In Fig. 1, the different-to-type open fluid switching device includes a reversing nozzle (1), a flow divider (17), a first switching channel (181), a second switching channel (182), a switching device timing guide rod ( 19) and a photoelectric converter (20). Wherein, the splitter (17) has adjacent first splitter funnels (171) and second splitter funnels (172), and the lower ends of the first splitter funnels (171) and the second splitter funnels (172) correspond to first guides respectively. The guide tube (1711) and the second guide tube (1722); in addition, the lower ends of the first guide tube (1711) and the second guide tube (1722) are respectively placed in the first reversing channel (181) And in the second reversing channel (182). The timing guide rod (19) of the fluid switching device is fixedly connected with the shunt (17) and cooperates with the photoelectric converter (20) to generate a timing control signal. The working principle of this type of fluid switching device and the corresponding fluid switching flow model can be shown in FIG. 2 . It can be seen from Figure 2 that the working process of this type of fluid switching device can be divided into the following stages:

In the stage t ₀ — t ₁₀ , the fluid switching device starts to switch the fluid from the bypass pipe to the working volume, and the fluid ejected from the nozzle is gradually switched from the bypass pipe to the working volume. At this time, the timer does not count. The cumulative amount of fluid flowing into the working volume in this process is represented by A.

t ₁₀ — t ₂₀ stage, at this stage the fluid switching device gradually completely switches the fluid into the working volume, and the timer starts timing from t ₁₀ , during which the cumulative amount of fluid flowing into the working volume is denoted by B.

_In the t20 - t30 stage, _at this stage, the switching of the fluid by the fluid switching device is completed, and the fluid ejected from the nozzle completely enters the working volume meter, and the timer continues _the continuous timing in the t10 - _t20 stage , and this process flows into the working volume The accumulative amount of fluid in the device is represented by G.

In the t30 - _t40 stage, the fluid switching device starts to switch from the working volume to the bypass pipe _at this stage, and the fluid ejected from the nozzle gradually flows into the bypass pipe from the working volume , and the timer continues in _the t20 - t30 _stage For continuous timing, the cumulative amount of fluid flowing into the working volume in this process is represented by E.

_In the stage of t40 - _t50 , the fluid switching device gradually completely switches the fluid from the working volume into the bypass pipe at this stage, and the timer stops counting _at time t40 , and the cumulative amount of fluid flowing into the working volume in this process is represented by F.

According to the above analysis, the whole switching process of the fluid switching device can be divided into two processes of switching in/switching out. The two fluid switching processes of this type of fluid switching device are processes in opposite directions, so this type of fluid switching device During the entire fluid switching process, switching in/switching out is different. According to the working process of this type of fluid switching device and the start and end time of timing, it can be obtained that the cumulative amount of fluid flowing into the working volume of this type of fluid switching device during the switching in/switching out process is Q =A+B+G+ E+F, the timing period is t ₁₀ — t ₄₀ , so it can be obtained that the average flow rate in the fluid switching cycle of this type of fluid switching device is q = Q /( t ₄₀ - t ₁₀ ). Due to the uneven distribution of fluid flow velocity in the nozzle part of this type of fluid switching device and the different directions of switching in/switching out when this type of fluid switching device switches fluids, the above flow rate is not the actual flow rate in the pipeline during the fluid switching cycle of this type of fluid switching device. Flow, the actual flow in the pipeline should be: q ₁ =(B+C+G+D+E)/( t ₄ -t ₁ ). To make q = q ₁ , there must be: A+B+G+E+F=B+C+G+D+E, namely A+F=C+D. To satisfy A+F=C+D, the pulse trigger position of the timer must be adjusted according to the fluid flow velocity distribution.

In fact, when the flow rate is different, the flow velocity distribution of the fluid ejected from the nozzle of the fluid switching device is also different. If the pulse trigger position is adjusted according to the fluid flow velocity distribution at a certain flow rate and placed at a fixed position, the fluid flow rate at this flow rate will The uncertainty caused by the switching device will be small, but at other flow rates, the uncertainty caused by the flow velocity distribution and the pulse trigger position will greatly increase, and the method of continuously adjusting the pulse trigger position according to different flows is not necessary. It is feasible, so it is difficult for this type of fluid switching device to realize A+F=C+D, so this type of fluid switching device has a certain effect on the average flow rate and the actual flow rate obtained in one cycle of switching in/switching out when the fluid is switched. Larger error, which brings larger uncertainty to the liquid flow standard device. In order to better solve the problem of greater uncertainty caused by the different directions of "switching in/switching out" when the fluid is switched by the open fluid switching device in different directions, a more feasible way is to make the open fluid switching device The "switching in/switching out" in the same direction during fluid switching, the utility model proposes a "switching in/switching out" fluid switching device in the same direction to solve this problem.

Contents of the invention

The purpose of the utility model is to provide a co-directional open fluid switching device in a liquid flow standard device.

For realizing above-mentioned purpose, the technical scheme that the utility model takes is:

The utility model mainly includes a nozzle, a stepping motor, a shaft coupling, a rotating shaft, a disc, a light-transmitting slit, a first photoelectric converter, a second photoelectric converter, a timing and frequency counting device, a first shunt baffle, a second Two shunt baffles, semi-cylindrical tubes, rectifying surfaces, bypass tubes, shells, and working gauges. The stepper motor is connected to the rotating shaft through a coupling; the disk has a slit that can transmit light, and is fixedly installed on the rotating shaft; the first photoelectric converter and the second photoelectric converter are respectively symmetrically installed on any On a fixed bracket, it is connected with the timing and frequency counting device through a shielded wire; the first shunt baffle and the second shunt baffle are symmetrically fixed and installed on both sides of the rotating shaft, and pass through the diameter of the semi-cylindrical tube vertically, forming together with the rotating shaft The side closing plate of the semi-cylindrical tube; the semi-cylindrical tube is half of the cylinder and passes through the bottom of the shell vertically, wherein the liquid inlet part above the bottom of the shell and the liquid outlet part below the bottom of the shell are both semi-cylindrical tubes, which are in contact with the bottom of the shell Part of it is a full cylindrical tube; the liquid outlet at the bottom of the semi-cylindrical tube is opposite to the liquid inlet of the working volume; the contact part between the full cylindrical tube and the bottom of the shell is sealed with a sealing material, and the sealing requirement should reach half (full ) When the cylindrical tube and the bottom of the shell rotate relative to each other, the fluid will not leak from the seal; the rectifying surface is semi-conical, and there is a gap between its lowermost end and the bottom of the shell, and the axis is fixedly connected with the rotating shaft; the semi-cylindrical The tube and the rectifying surface are symmetrically fixed on both sides of the rotating shaft; the housing is located above the working volume and fixed on any bracket, and the bottom has a liquid outlet to connect with the bypass pipe.

Compared with the prior art, the utility model has the advantages of simple structure and good reversing robustness. It not only solves the problem that the fluid switching device switches the fluid in the same direction, but more importantly, the same direction is achieved by the device. The fluid switching greatly reduces the uncertainty caused by the fluid switching, and improves the measurement accuracy of the liquid flow standard device.

Description of drawings

Fig. 1 is a structural diagram of an open fluid switching device in different directions;

Fig. 2 is a fluid switching flow model diagram of an open fluid switching device in different directions;

Fig. 3 is a structural diagram of the same-direction open fluid switching device of the present invention;

Fig. 4 is a fluid switching flow model diagram of the same-direction open fluid switching device of the present invention;

Figures 5 to 7 are diagrams of the fluid switching process of the same-direction open fluid switching device of the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

The utility model completely abandons the design structure of the traditional different-directional open fluid switching device, and adopts a brand-new design structure. As shown in Figure 3, it mainly includes a nozzle 1, a stepping motor 2, a coupling 3, a rotating shaft 4, a disk 5, a light-transmitting slit 6, a first photoelectric converter 7, a second photoelectric converter 8, a timing Frequency counting device 9 , first shunt baffle 10 , second shunt baffle 11 , semi-cylindrical tube 12 , rectifying surface 13 , bypass pipe 14 , housing 15 , and working gauge 16 .

When using the fluid switching device of the present utility model, the stepping motor 2 can be connected with the rotating shaft 4 through the shaft coupling 3; The first photoelectric converter 7 and the second photoelectric converter 8 are symmetrically installed on any fixed support respectively, and are connected with the timer 9 through shielded wires; the first shunt baffle 10 and the second shunt baffle 11 are symmetrically fixed Installed on both sides of the rotating shaft 4, and vertically pass through the diameter of the semi-cylindrical tube 12, together with the rotating shaft 4, form the side closing plate of the semi-cylindrical tube 12; the semi-cylindrical tube 12 is half of the cylinder, passing through the bottom of the housing 15 vertically Wherein the liquid inlet part above the bottom of the housing 15 and the liquid outlet part below are semi-cylindrical tubes 12, and the part in contact with the bottom of the housing 15 is a full cylindrical tube; The liquid inlet of the gauge 16 is opposite; the contact part between the full cylindrical tube and the bottom of the housing 15 is sealed with a sealing material, and the sealing requirement should be such that when the half (full) cylindrical tube 12 and the bottom of the housing 15 perform relative rotational movement, the fluid will not Leakage from the seal; the rectifying surface 13 is semi-conical, with a gap between its lowermost end and the bottom of the housing 15, and the axis is fixedly connected to the rotating shaft 4; the semi-cylindrical tube 12 and the rectifying surface 13 are symmetrically fixed on the rotating shaft 4 Both sides; the casing 15 is located above the working volume, fixed on any support, and the bottom is opened with a liquid outlet to connect with the bypass pipe 14.

The specific working process of the fluid switching device of the present utility model is as follows:

1) As shown in Figure 5, use the stepper motor 2 to drive the rotating shaft 4 to rotate clockwise through the coupling 3, and the rotating shaft 4 rotates clockwise to drive the disc 5, the first diverter baffle 10, and the second diverter baffle 11 , the semi-cylindrical tube 12, and the rectifying surface 13 rotate clockwise until the rectifying surface 13 is located on one side of the bypass tube 14, and the semi-cylindrical tube 12 is located on the other side of the bypass tube 14. This position is defined as the same direction open fluid switching device Positive 0° position; at this position, the fluid ejected from the nozzle 1 is diverted by the rectifying surface 13 and collected at the bottom of the housing 15, and enters the bypass pipe through the liquid outlet at the bottom of the housing 15, and flows into the circulating liquid pool.

2) As shown in Figure 6, use the stepper motor 2 to drive the rotating shaft 4 to rotate clockwise at a constant speed through the coupling 3, and the rotating shaft 4 to rotate clockwise at a constant speed to drive the disc 5, the first diverter baffle 10, the second The diverter baffle 11, the semi-cylindrical tube 12, and the rectifying surface 13 continuously rotate clockwise at a constant speed from the positive 0° position until the rotation angle reaches the positive 180°, which is defined as the forward position of the same-direction open fluid switching device. to the 180° position. At this position, the semi-cylindrical tube 12 is located under the nozzle 1 on one side of the bypass tube 14 , and the rectifying surface 13 is located on the other side of the bypass tube 14 . When the disc 5 continuously rotates clockwise at a constant speed and the angle reaches 90° in the positive direction, the light-transmitting slit 6 cooperates with the first photoelectric converter 7 to generate a photoelectric pulse, which is sent to the timing and frequency counting device 9 to start timing.

3) As shown in Figure 7, the stepper motor 2 is used to drive the rotating shaft 4 to rotate clockwise at a constant speed through the coupling 3, and the rotating shaft 4 rotates continuously clockwise at a constant speed to drive the disc 5, the first diverter baffle 10, the second The diverter baffle 11, the semi-cylindrical tube 12, and the rectifying surface 13 rotate clockwise at a constant speed from the positive 180° position until the rotation angle reaches the positive 360° and stop. This position coincides with the positive 0° position. This position Still defined as positive 0° position. At this position, the rectifying surface 13 is located on one side of the bypass pipe 14, and the semi-cylindrical pipe 12 is located on the other side of the bypass pipe 14. The liquid outlet at the bottom of the housing 15 enters the bypass pipe and flows into the circulating liquid pool. When the disc 5 continuously rotates clockwise at a constant speed and the angle reaches 270° in the positive direction, the light-transmitting slit 6 cooperates with the second photoelectric converter 8 to generate a photoelectric pulse, which is sent to the timing and frequency counting device 9 to stop timing; at this time, the same direction is completed. A switch-in/switch-out process of the open-type fluid switching device; controlling the stepping motor to drive the rotating shaft to rotate counterclockwise at a constant speed through the coupling can also complete another fluid switching process.

The above-mentioned structure of the same-direction open fluid switching device of the utility model and its corresponding working process realize the timing start (corresponding to step 2 of the above-mentioned working process) and the timing end (corresponding to the above-mentioned working process) of the same-direction open-type fluid switching device Step 3) is completed in the same direction and at the same position, that is, the same direction open fluid switching device realizes the "switching in/switching out" of the fluid in the same direction. The fluid switching flow model shown in FIG. 4 is a flow model corresponding to the fluid switching process of the co-directional open fluid switching device of the present invention. It can be seen from Figure 4 that since the flow model is the fluid model corresponding to the fluid "switching in/switching out" realized by the fluid switching device in the same direction, A=D, C=F, A+ F=C+D are realized, It overcomes the problem of A+F=C+D, which is difficult to realize the "switching in/switching out" fluid in different directions of different open fluid switching devices, so the average flow rate and the timing period of one cycle of fluid switching are finally realized. The actual flow is equal: q ₁ =(B+C+G+D+E)/( t ₄ - t ₁ )=(A+B+G+E+F)/( t ₄ - t ₁ )= q .

Claims (1)

1. a kind of type open type fluid switching device, including nozzle (1) in the same direction, stepper motor (2), shaft coupling (3), rotary shaft (4), Disk (5), transmissive slit (6), the first optical-electrical converter (7), the second optical-electrical converter (8), chronoscope frequency device (9), first Distributing damper (10), the second distributing damper (11), semicircle column jecket (12), rectification face (13), bypass pipe (14), housing (15), work Make measuring device (16), it is characterised in that：

The stepper motor (2) is connected by shaft coupling (3) with rotary shaft (4)；Disk (5) is provided with the slit for being capable of printing opacity (6), it is fixedly mounted in rotary shaft (4)；First optical-electrical converter (7) and the second optical-electrical converter (8) respectively symmetrically are installed On the support of any fixation, it is connected by shielding line with chronoscope frequency device (9)；First distributing damper (10) and second point Stream baffle plate (11) is symmetrically fixedly mounted on rotary shaft (4) both sides, and perpendicular through semicircle column jecket (12) diameter, with rotary shaft (4) the side-closed plate of semicircle column jecket (12) is formed together；Semicircle column jecket (12) is the half of cylinder, passes perpendicularly through housing (15) more than bottom, wherein housing (15) bottom water inlet portion and following water part are semicircle column jecket (12), with shell Body (15) bottom contact portion is wholecircle column jecket；The liquid outlet of semicircle column jecket (12) bottom and work measuring instrument (16) inlet phase It is right；Wholecircle column jecket and the contact portion of housing (15) bottom are sealed using encapsulant, and seal request should reach semicolumn When managing (12) or wholecircle column jecket with housing (15) bottom progress relative rotary motion, fluid will not be by sealing seepage；Rectification face (13) it is half cone-shaped, gap is left between its bottom and housing (15) bottom, axis is fixedly connected with rotary shaft (4)；Semicircle Column jecket (12) is symmetrically fixed on rotary shaft (4) both sides with rectification face (13)；Housing (15) is located above work measuring instrument, is fixed on In any bracket, bottom is provided with liquid outlet and is connected with bypass pipe (14).