Orifice plate flowmeter capable of achieving bidirectional measurement

Abstract

The utility model belongs to the technical field of flow meters, and provides an orifice plate flow meter capable of bidirectionally measuring, which comprises a pipeline, a differential pressure transmitter and a pressure tapping valve group, and the pressure tapping valve group comprises a valve body, a valve core and a switching device. The valve body is provided with a valve cavity, a pressure tapping connector, a transmitter connector, a first unblocking flow channel and a second unblocking flow channel. The valve element is arranged in the valve cavity in a sliding mode and provided with a pressure tapping flow channel, and the pressure tapping flow channel can communicate the pressure tapping connector with the transmitter connector and can also communicate the first unblocking flow channel with the second unblocking flow channel. The switching device is used for changing the working position of the valve element in the valve cavity. The orifice plate flowmeter can solve the problem that the orifice plate flowmeter for bidirectional measurement is easy to block.

Description

TECHNICAL FIELD

[0001] The utility model relates to flowmeter technical field, concretely relates to a orifice plate flowmeter of two -way measurement. BACKGROUND

[0002] In some working conditions, such as the same pipeline medium flow direction will periodically or sporadically change, will use the orifice plate flowmeter of two -way measurement. The utility model discloses a kind of dismantling-free anti-blocking two-way flow measurement balanced orifice plate flowmeter with CN211552932U, the patent uses two sets of differential pressure transmitter to share a pair of pressure tapping, so that the differential pressure measured is more stable, but the pressure tapping guide pipe of the patent needs to extend from the pipeline outer wall to forward three valve group and reverse three valve group, the length of pressure tapping guide pipe is longer, forms long and thin blind pipe, when intermittent operation or night cooling, fluid in pressure tapping guide pipe is stationary, supersaturated solution precipitates crystal, so that it is easy to produce blockage at the root of pressure tapping and pressure tapping elbow. UTILITY MODEL CONTENTS

[0003] In view of the defects in the prior art, the utility model aims to provide an orifice plate flowmeter capable of two-way measurement to solve or at least alleviate one or more of the above technical problems or other aspects of the prior art.

[0004] To achieve the above-mentioned purpose, the utility model provides an orifice plate flowmeter capable of two-way measurement, comprising: a pipeline, provided with two pressure tapping at the top; two differential pressure transmitters arranged oppositely above the pipeline; and a pressure valve group fixedly arranged on the pipeline;

[0005] The pressure valve group comprises a valve body, a valve core and a switching device;

[0006] The valve body has a valve cavity, two pressure tapping interfaces arranged at the bottom of the valve body, two pairs of transmitter interfaces arranged at the top of the valve body, two first unblocking flow channels arranged oppositely at the upper part of the valve body, and two pairs of second unblocking flow channels arranged oppositely at the lower part of the valve body;

[0007] The valve core is slidably arranged in the valve cavity and sealed with the valve cavity, has two pairs of pressure flow channels, each pair of pressure flow channels can connect two pressure tapping interfaces with corresponding transmitter interfaces, and each pair of pressure flow channels can also connect one first unblocking flow channel with a corresponding pair of second unblocking flow channels;

[0008] The switching device is used to change the working position of the spool in the valve cavity.

[0009] Further, the switching device comprises a switching rod, one end of which extends into the valve cavity and is connected with the spool, and the other end of which is located outside the valve body.

[0010] Further, the one end of the switching rod is fixedly connected with the spool.

[0011] Further, a scale line is arranged on the switching rod.

[0012] Further, the switching rod is sealingly connected with the valve body, the spool divides the valve cavity into a first chamber and a second chamber, and the valve body further has a communication flow passage for communicating the first chamber and the second chamber.

[0013] Further, the pressure tapping valve group further comprises a blockage cleaning structure for cleaning the pressure tapping port to prevent the pressure tapping port from being blocked, the blockage cleaning structure comprising: two first mounting holes oppositely arranged on the spool, the two first mounting holes being located between two pairs of pressure tapping flow passages, and the first mounting holes extending through the spool in the longitudinal direction; a top rod which is sealingly connected with the first mounting hole and can be moved downwardly into the pressure tapping port; two second mounting holes oppositely arranged on the upper part of the valve body and corresponding to the first mounting holes; and an operating rod arranged in each second mounting hole, one end of the operating rod being capable of pushing the top rod into the pressure tapping port, and the other end of the operating rod being located outside the valve body.

[0014] Further, the first mounting hole comprises a small-diameter section at the lower end and a large-diameter section at the upper end, the top rod comprises a rod portion matched with the small-diameter section and a head portion matched with the large-diameter section; and the blockage cleaning structure further comprises a return spring located in the large-diameter section, one end of the return spring abutting against the bottom of the large-diameter section, and the other end of the return spring abutting against the head portion.

[0015] Further, the operating rod is threadedly connected with the second mounting hole.

[0016] Further, the diameter of the head portion is greater than the hole diameter of the second mounting hole.

[0017] The utility model discloses a beneficial effect: the utility model provides a kind of orifice plate flowmeter of two-way measurement, the communication of pipeline and any one in two differential pressure transmitter is realized by one pressure tapping valve group, and then two-way measurement is realized, meet the measurement requirement of some specific working condition.Simultaneously, the pressure tapping guide tube of differential pressure transmitter is directly connected with same pressure tapping valve group, the length of pressure tapping guide tube is shortened, and it is not easy to produce blockage in pressure tapping guide tube, and for relatively easy to produce the pressure tapping valve group of blockage, by setting first and second unblocking flow channel, the dredging of pressure tapping flow channel can be realized, to solve the problem that the orifice plate flowmeter of two-way measurement in prior art is easy to block. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0019] Figure 1 It is a perspective view of the orifice plate flowmeter of two-way measurement provided by an embodiment of the utility model;

[0020] Figure 2 It is a perspective view of the pressure tapping valve group;

[0021] Figure 3 It is a top view of the pressure tapping valve group and the pipe body in one direction;

[0022] Figure 4 It is Figure 3 A-A sectional view in Figure 4 In

[0023] Figure 5 It is Figure 4 structure schematic view when the valve core is in the second working position in

[0024] Figure 6 It is Figure 4 structure schematic view when the valve core is in the third working position in

[0025] Figure 7 It is a perspective view of the pressure tapping valve group after being cut in one view angle;

[0026] Figure 8 It is a perspective view of the pressure tapping valve group after being cut in another view angle;

[0027] Figure 9 It is a perspective view of the pressure tapping valve group after being cut in another view angle;

[0028] Figure 10a perspective view of the valve body after being cut along a viewing angle;

[0029] Figure 11 a structural schematic view of the ejector rod and the reset spring;

[0030] Reference signs:

[0031] 10, pipe; 11, pipe body; 12, pressure tapping; 13, flange plate;

[0032] 20, differential pressure transmitter; 21, transmitter body; 22, pressure lead pipe;

[0033] 30, pressure tapping valve group;

[0034] 31, valve body; 311, valve cavity; 312, first chamber; 313, second chamber; 314, pressure tapping interface; 315, transmitter interface; 316, first unblocking flow channel; 317, second unblocking flow channel; 318, communication flow channel;

[0035] 32, valve core; 321, pressure tapping flow channel;

[0036] 331, switching rod; 332, scale line;

[0037] 341, first mounting hole; 3411, small hole diameter section; 3412, large hole diameter section; 342, ejector rod; 3421, rod part; 3422, head part; 343, second mounting hole; 344, operating rod; 345, reset spring. DETAILED DESCRIPTION

[0038] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the technical personnel in the field to which the present application belongs.

[0040] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0042] In this application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In this application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0044] As shown in Figures 1-11 The embodiment provides a bidirectional measuring orifice flowmeter, which comprises a pipeline 10, a differential pressure transmitter 20 and a pressure tapping valve group 30. The pipeline 10 comprises a pipe body 11 and flanges 13 arranged at both ends of the pipe body 11, and the flanges 13 and the pipe body 11 are welded into an integrated whole, wherein the top of the pipe body 11 is provided with two pressure tapping openings 12, and the two pressure tapping openings 12 are distributed along the axial direction of the pipe body 11. Two differential pressure transmitters 20 are oppositely arranged above the pipeline 10, and the differential pressure transmitter 20 comprises a transmitter main body 21 and a pressure lead pipe 22, and the pressure lead pipe 22 has two. The pressure tapping valve group 30 is fixedly arranged on the pipe body 11 of the pipeline 10, and the pressure tapping valve group 30 comprises a valve body 31, a valve core 32 and a switching device. The pressure lead pipe 22 of the differential pressure transmitter 20 is detachably connected with the valve body 31, and specifically, the threaded connection is realized through a nut assembly.

[0045] The bottom of the valve body 31 is welded with the pipe body 11, and the valve body 31 has a valve cavity 311, two pressure tapping interfaces 314, two transmitter interfaces 315, two first unblocking flow channels 316 and two second unblocking flow channels 317. Two pressure tapping interfaces 314 are arranged on the bottom of the valve body 31, and each of the two pressure tapping interfaces 314 is arranged in correspondence with one of the two pressure tapping openings 12 and keeps communication with the pressure tapping opening 12, and the two pressure tapping interfaces 314 are located directly above the two pressure tapping openings 12. Two pairs of transmitter interfaces 315 are arranged on the top of the valve body 31, and each pair of transmitter interfaces 315 includes two transmitter interfaces 315, and each pair of transmitter interfaces 315 is connected with two pressure lead pipes 22 of each differential pressure transmitter 20, and the two pressure tapping interfaces 314 are located between the two pairs of transmitter interfaces 315. Two first unblocking flow channels 316 are arranged oppositely on the upper part of the valve body 31, and the first unblocking flow channels 316 are formed in the valve body 31 above the valve cavity 311, and the two ends of the first unblocking flow channels 316 keep communication with the valve cavity 311. Two pairs of second unblocking flow channels 317 are arranged oppositely on the lower part of the valve body 31, and each pair of second unblocking flow channels 317 includes two second unblocking flow channels 317, and the second unblocking flow channels 317 are formed in the valve body 31 below the valve cavity 311, and one end of the second unblocking flow channels 317 keeps communication with the valve cavity 311, and the other end of the second unblocking flow channels 317 keeps communication with the outside of the valve body 31. The other end of the second unblocking flow channels 317 can be connected with an external unblocking pipeline or device, such as a liquid pipeline or a gas pipeline for unblocking, and the fluid in the pipeline can be driven by a manual tool, an electric or pneumatic device, etc.

[0046] It should be noted that, since the other end of the second unblocking flow channels 317 can be connected with various forms of unblocking devices, the unblocking devices are not shown in the drawings of the utility model, but this does not hinder the understanding of the unblocking devices by those skilled in the art.

[0047] The valve core 32 is slidingly arranged in the valve cavity 311, the cross section of the valve core 32 is matched with the cross section of the valve cavity 311, the length of the valve core 32 is less than the length of the valve cavity 311, so that the valve core 32 can slide back and forth in the length direction of the valve cavity 311, and the valve core 32 is always sealed with the valve cavity 311, for example, a sealing ring is sleeved at both ends of the valve core 32, and the sealing is realized through the sealing ring. The valve core 32 has two pairs of pressure taking flow channels 321, each pair of pressure taking flow channels 321 includes two pressure taking flow channels 321, and the pressure taking flow channels 321 longitudinally penetrate the valve core 32. Each pair of pressure taking flow channels 321 can communicate two pressure taking interfaces 314 with a corresponding transmitter interface 315, that is, by changing the position of the valve core 32 in the valve cavity 311, the lower end of one pair of pressure taking flow channels 321 on the valve core 32 is aligned with the two pressure taking interfaces 314, and the upper end is aligned with a pair of transmitter interfaces 315. Each pair of pressure taking flow channels 321 can also communicate one first cleaning flow channel 316 with a corresponding pair of second cleaning flow channels 317, so that the cleaning of the blockage in the pressure taking flow channel 321 can be realized through the connected cleaning pipeline. The cleaning pipeline can be connected to the valve body 31 at all times, or can be connected to the valve body 31 only when the cleaning work is performed, and can be selected according to the different cleaning periods. When one pair of pressure taking flow channels 321 is communicated with the corresponding first cleaning flow channel 316 and second cleaning flow channel 317, the two pressure taking interfaces 314 can be communicated with another pair of pressure taking flow channels 321, or can not be communicated.

[0048] When the pressure taking flow channel 321 is cleaned, the external fluid flows from one second cleaning flow channel 317, flows upward through one of the pressure taking flow channels 321, then enters the first cleaning flow channel 316, then flows downward from the other pressure taking flow channel 321, and finally flows out from the other second cleaning flow channel 317.

[0049] The switching device is used to change the working position of the valve core 32 in the valve cavity 311, so that the valve core 32 communicates the pressure taking port 12 with different transmitter interfaces 315. As shown in Figure 4 the valve core 32 is in the first working position in the valve cavity 311, at this time, the pair of pressure taking flow channels 321 on the right side of the valve core 32 communicates the lower pair of pressure taking ports 12 with the upper pair of transmitter interfaces 315, and the pair of pressure taking flow channels 321 on the left side of the valve core 32 communicates the upper first cleaning flow channel 316 with the lower pair of second cleaning flow channels 317. As shown in Figure 5 the valve core 32 is in the second working position in the valve cavity 311, at this time, the pair of pressure taking flow channels 321 on the left side of the valve core 32 communicates the lower pair of pressure taking ports 12 with the upper pair of transmitter interfaces 315, and the pair of pressure taking flow channels 321 on the right side of the valve core 32 communicates the upper first cleaning flow channel 316 with the lower pair of second cleaning flow channels 317.

[0050] In the embodiment, the pipeline 10 is communicated with any one of the two differential pressure transmitters 20 through the pressure tapping valve group 30, thereby realizing bidirectional measurement and meeting the measurement requirements of some specific working conditions. Meanwhile, the pressure tapping pipe 22 of the differential pressure transmitter 20 is directly connected with the same pressure tapping valve group 30, the length of the pressure tapping pipe 22 is shortened, and the pressure tapping pipe 22 is not easy to be blocked. For the pressure tapping valve group 30 which is relatively easy to be blocked, the first and second unblocking flow channels 316 and 317 are arranged to unblock the pressure tapping flow channel 321, thereby solving the problem that the orifice plate flowmeter of the bidirectional measurement is easy to be blocked in the prior art.

[0051] In an embodiment, the switching device comprises a switching rod 331, one end of the switching rod 331 extends into the valve cavity 311 and is connected with the valve core 32, and the other end of the switching rod 331 is located outside the valve body 31. The switching rod 331 extends in the transverse direction, and the above-mentioned one end of the switching rod 331 extending into the valve cavity 311 can be fixedly connected with the valve core 32 or rotatably connected with the valve core 32. When the switching rod 331 is rotatably connected with the valve core 32, the switching rod 331 can rotate around its own axis and push and pull the valve core 32. The above-mentioned other end of the switching rod 331 located outside the valve body 31 can drive the switching rod 331 by manual operation or by a driving device such as a motor, a pneumatic cylinder, an electro-hydraulic push rod, etc. When the driving device is used to drive, the driving device constitutes part of the switching device. Whether to use manual driving or driving by the driving device can be determined according to the switching frequency of the valve core 32.

[0052] In an embodiment, the above-mentioned one end of the switching rod 331 is fixedly connected with the valve core 32, and correspondingly, the switching rod 331 is slidingly connected with the valve body 31. In this way, the valve core 32 can be driven by manually operating the switching rod 331.

[0053] In an embodiment, the switching rod 331 is provided with a scale line 332, and the scale line 332 is distributed along the extension direction of the switching rod 331. Under the premise of manually operating the switching rod 331, the scale line 332 is arranged to facilitate the operator to switch the valve core 32 to the corresponding working position by reading the numerical value on the scale line 332.

[0054] In one embodiment, the switching rod 331 is in sealing connection with the valve body 31. Since the switching rod 331 is movable, a hole sealing ring is installed in the hole on the valve body 31 for mounting the switching rod 331 to achieve sealing. The valve core 32 divides the valve cavity 311 into a first chamber 312 and a second chamber 313, and the valve body 31 further has a communication flow channel 318 for communicating the first chamber 312 and the second chamber 313. By setting the switching rod 331 in sealing connection with the valve body 31, the sealing effect can be further enhanced, and the overall sealing effect of the pressure taking valve group 30 is improved. At the same time, based on the sealing connection between the switching rod 331 and the valve body 31, and the manual operation of the switching rod 331, by setting the communication flow channel 318, the medium between the first chamber 312 and the second chamber 313 can flow back and forth during the process of pushing and pulling the valve core 32 back and forth, thereby reducing the resistance of manually pushing and pulling the valve core 32.

[0055] In one embodiment, as shown in Figures 4-9 The pressure taking valve group 30 further includes a blockage cleaning structure for cleaning the pressure taking port 12 to prevent the pressure taking port 12 from being blocked. The blockage cleaning structure includes a first mounting hole 341, a top rod 342, a second mounting hole 343, and an operating rod 344. Two first mounting holes 341 are oppositely arranged on the valve core 32, and the two first mounting holes 341 are located between the two pairs of pressure taking flow channels 321. The two first mounting holes 341 are arranged one-to-one with the two pressure taking ports 12, and the first mounting hole 341 penetrates the valve core 32 in the longitudinal direction. The top rod 342 is arranged in the first mounting hole 341 in a lifting manner, and the top rod 342 is arranged one-to-one with the first mounting hole 341, so the top rod 342 is also arranged in two, and the top rod 342 is in sealing connection with the first mounting hole 341 in the first mounting hole 341. The top rod 342 can be moved downwardly into the pressure taking port 12, and the diameter of the top rod 342 is slightly smaller than the hole diameter of the pressure taking port 12. Two second mounting holes 343 are oppositely arranged on the upper part of the valve body 31, and the second mounting holes 343 are arranged one-to-one with the first mounting holes 341. One operating rod 344 is arranged in each second mounting hole 343, and the operating rod 344 extends in the longitudinal direction. One end (i.e. the lower end) of the operating rod 344 can push the top rod 342 downwardly into the pressure taking port 12, and the other end (i.e. the upper end) of the operating rod 344 is located outside the valve body 31 to facilitate the operation of the operator.

[0056] In this embodiment, as shown in Figure 6As shown, the valve core 32 also has a third working position, when the valve core 32 is in the third working position, the two first mounting holes 341 are aligned with the corresponding pressure tapping ports 12, the two second mounting holes 343 are also aligned with the corresponding two first mounting holes 341, and the two pairs of pressure tapping flow channels 321 are neither in communication with the pressure tapping ports 12 nor in communication with the transmitter interface 315. The operator drives the top rod 342 downward by operating the operating rod 344, so that the top rod 342 extends into the pressure tapping port 12, thereby cleaning the blockage in the pressure tapping port 12.

[0057] In one embodiment, the first mounting hole 341 is a stepped hole, which includes a small-diameter section 3411 at the lower end and a large-diameter section 3412 at the upper end. The top rod 342 includes a rod portion 3421 adapted to the small-diameter section 3411 and a head portion 3422 adapted to the large-diameter section 3412, the rod portion 3421 is retained in the small-diameter section 3411, and the head portion 3422 is retained in the large-diameter section 3412. The unblocking structure further includes a return spring 345 located in the large-diameter section 3412, one end of the return spring 345 abuts the bottom of the large-diameter section 3412 (i.e. the step surface of the stepped hole), and the other end abuts the head portion 3422, and the return spring 345 is sleeved outside the rod portion 3421 of the top rod 342.

[0058] The sealing connection between the top rod 342 and the first mounting hole 341 can be that the rod portion 3421 of the top rod 342 is sealed with the small-diameter section 3411, or that the head portion 3422 of the top rod 342 is sealed with the large-diameter section 3412, or that both of the above are sealed.

[0059] In the present embodiment, since the valve core 32 is movable, the operating rod 344 and the top rod 342 cannot be fixedly connected, and by providing the return spring 345, when the operating rod 344 moves upward, the return spring 345 can make the top rod 342 leave the pressure tapping port 12 and return to the first mounting hole 341, so that there is no connection relationship between the operating rod 344 and the top rod 342. Compared with some other ways of returning the top rod 342 upward, such as magnetic attraction between the operating rod 344 and the top rod 342, the way of the return spring 345 is simpler and more reliable.

[0060] In the present embodiment, when the pressure tapping port 12 is unblocked, the two differential pressure transmitters 20 will be disconnected from the pipeline 10, so the above operation is applicable to the shutdown maintenance.

[0061] In one embodiment, the operating rod 344 is screwed with the second mounting hole 343, on one hand, the operating rod 344 is not easy to lose, on the other hand, when the screw thread with self-sealing is used, the sealing effect can be improved, and the possibility of the medium in the pipeline 10 flowing out from the pressure tapping hole 12 to the outside through the first mounting hole 341 and the second mounting hole 343 when the blockage in the pressure tapping hole 12 is cleaned can be further reduced.

[0062] In one embodiment, the diameter of the head 3422 of the top rod 342 is greater than the hole diameter of the second mounting hole 343, so that when the working position of the valve core 32 is switched back and forth, the head 3422 of the top rod 342 cannot enter the second mounting hole 343, thereby hindering the movement of the valve core 32. At the same time, the top rod 342 is always kept in the first mounting hole 341, ensuring reliable sealing effect.

[0063] In the specification of the utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0064] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should be covered in the scope of the claims and the specification of the utility model.

Claims

1. A bidirectional orifice flowmeter, characterized in that: include: The pipeline (10) is provided with two pressure tapping ports (12) at the top; Two differential pressure transmitters (20) are arranged opposite to each other above the pipeline (10); and A pressure valve assembly (30) is fixedly arranged on the pipeline (10); The pressure-taking valve assembly (30) comprises a valve body (31), a valve core (32) and a switching device; The valve body (31) has: Valve chamber (311); Two pressure-taking interfaces (314) are provided at the bottom of the valve body (31), and the two pressure-taking interfaces (314) correspond to the two pressure-taking ports (12) one by one and maintain communication with each other; Two pairs of transmitter interfaces (315) are provided on the top of the valve body (31), and the two pairs of transmitter interfaces (315) are respectively connected to the two differential pressure transmitters (20); Two first clearing flow channels (316) are oppositely arranged on the upper part of the valve body (31), and both ends of the first clearing flow channels (316) are in communication with the valve cavity (311); as well as Two pairs of second clearing flow channels (317) are oppositely arranged at the lower part of the valve body (31), one end of the second clearing flow channel (317) is connected to the valve cavity (311), and the other end is connected to the outside of the valve body (31); The valve core (32) is slidably disposed in the valve cavity (311) and is sealed with the valve cavity (311), and has two pairs of pressure-taking channels (321). Each pair of the pressure-taking channels (321) can connect two pressure-taking interfaces (314) with corresponding transmitter interfaces (315). Each pair of the pressure-taking channels (321) can also connect one of the first clearing channels (316) with a corresponding pair of the second clearing channels (317). The switching device is used to change the working position of the valve core (32) in the valve chamber (311).

2. The orifice flowmeter capable of bidirectional measurement according to claim 1, characterized in that: The switching device comprises a switching rod (331), one end of which extends into the valve cavity (311) and is connected to the valve core (32), and the other end of which is located outside the valve body (31).

3. The orifice flowmeter capable of bidirectional measurement according to claim 2, characterized in that: One end of the switching rod (331) is fixedly connected to the valve core (32).

4. The orifice flowmeter capable of bidirectional measurement according to claim 3, characterized in that: The switching rod (331) is provided with a scale line (332).

5. The orifice flowmeter capable of bidirectional measurement according to claim 4, characterized in that: The switching rod (331) is sealedly connected to the valve body (31), the valve core (32) divides the valve cavity (311) into a first chamber (312) and a second chamber (313), and the valve body (31) further has a connecting flow channel (318) connecting the first chamber (312) and the second chamber (313).

6. The orifice flowmeter capable of bidirectional measurement according to any one of claims 1 to 5, characterized in that: The pressure-taking valve assembly (30) further comprises a clearing structure for clearing the pressure-taking port (12) to prevent the pressure-taking port (12) from being clogged, the clearing structure comprising: Two first mounting holes (341) are arranged opposite to each other on the valve core (32), the two first mounting holes (341) are located between the two pairs of pressure-taking flow channels (321), and the first mounting holes (341) penetrate the valve core (32) in the longitudinal direction; A push rod (342) is movably disposed in the first mounting hole (341), maintains a sealed connection with the first mounting hole (341), and is capable of moving downward into the pressure taking port (12); Two second mounting holes (343) are arranged opposite to each other on the upper portion of the valve body (31), and are arranged in a one-to-one correspondence with the first mounting holes (341); and An operating rod (344) is provided in each of the second mounting holes (343), one end of which is capable of pushing the push rod (342) into the pressure port (12), and the other end of which is located outside the valve body (31).

7. The orifice flowmeter capable of bidirectional measurement according to claim 6, characterized in that: The first mounting hole (341) comprises a small-aperture section (3411) at the lower end and a large-aperture section (3412) at the upper end, and the top rod (342) comprises a rod portion (3421) adapted to the small-aperture section (3411) and a head portion (3422) adapted to the large-aperture section (3412); The blockage clearing structure further comprises a return spring (345) located in the large-aperture section (3412), one end of the return spring (345) abutting against the bottom of the large-aperture section (3412), and the other end abutting against the head (3422).

8. The orifice flowmeter capable of bidirectional measurement according to claim 7, characterized in that: The operating rod (344) is threadedly connected to the second mounting hole (343).

9. The orifice flowmeter capable of bidirectional measurement according to claim 8, characterized in that: The diameter of the head (3422) is larger than the aperture of the second mounting hole (343).

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