A pressure taking device

Abstract

The present invention discloses a pressure taking device, comprising a connecting pipeline, wherein the connecting pipeline further comprises connecting flanges arranged at both ends, a pressure pipeline arranged in the middle, and pressure taking pipelines symmetrically arranged on the sides of both ends and connected; a pressure taking assembly, wherein the pressure taking assembly is connected to the pressure taking pipelines arranged at both ends and is used to measure the fluid pressure of the connecting pipeline. Beneficial effects of the present invention: The present invention can perform differential pressure measurement on the pipeline, and balance the pressure at both ends of the pressure taking pipeline through a vent valve, thereby improving the detection accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline differential pressure measurement, and in particular to a pressure taking device. Background Art

[0002] In recent years, the working principle of the wedge flow sensor is the same. The wedge flow sensor is also based on the Bernoulli formula, using the principle that the fluid obeys the law of conservation of energy during the flow process, that is, the sum of kinetic energy and static pressure energy remains unchanged, and the flow rate is measured based on the principle of pressure difference when the fluid passes through the circular wedge block that acts as a throttling block. When the fluid flows through the wedge-shaped throttling block, the flow area decreases, the flow rate increases, and the static pressure decreases, thereby generating a static pressure difference. Since the square root of the pressure difference is proportional to the flow rate, the flow rate in the pipeline can be obtained by measuring the pressure difference. The static pressure difference can be measured by a pressure transmitter; a pressure transmitter is a device that converts pressure into pneumatic or electric signals for control and remote transmission. It can convert physical pressure parameters such as gas and liquid sensed by the pressure measuring element sensor into standard electrical signals to supply secondary instruments such as indicator alarms, recorders, and regulators for measurement, indication, and process adjustment. The pressure transmitter is the most commonly used sensor in industrial practice. It is composed of a measuring diaphragm and electrodes on both sides of the insulating sheet to form a capacitor. When the pressure on both sides is inconsistent, the measuring diaphragm is displaced, and the displacement is proportional to the pressure difference. Therefore, the capacitance on both sides is not equal, through oscillation and demodulation links. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a pressure taking device capable of taking and measuring the pipeline pressure.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a pressure taking device, comprising a connecting pipe, wherein the connecting pipe also includes connecting flanges arranged at both ends, a pressure pipe arranged in the middle and pressure taking pipes symmetrically arranged on the sides of both ends and connected; a pressure taking assembly, wherein the pressure taking assembly is connected to the pressure taking pipes arranged at both ends and is used to measure the fluid pressure of the connecting pipe.

[0007] As a preferred solution of the pressure taking device described in the present invention, the pressure taking assembly further includes an annular positioning body, a vent pipe and a pressure transmitter; one side of the annular positioning body is connected to the pressure taking pipe, the pressure transmitter is connected to the other side of the annular positioning body through a capillary filled with fluid, the vent pipe is arranged above the annular positioning body and connected thereto, and a vent valve is arranged between the vent pipes on both sides.

[0008] As a preferred solution of the pressure taking device described in the present invention, wherein: the annular positioning body also includes a measuring chamber, an upper channel and a lower channel; the measuring chamber is connected to the pressure taking pipeline, the upper channel and the lower channel are respectively arranged above and below the measuring chamber and are connected, and the upper channel is connected to the venting pipeline.

[0009] As a preferred solution of the pressure taking device described in the present invention, wherein: the annular positioning body also includes a flushing valve, a positioning flange and a joint; the flushing valve is arranged below the measuring chamber and is connected to the lower channel, the positioning flange is arranged on one side of the measuring chamber and is connected to the pressure taking pipeline through the pressure taking flange, and the joint is used for connecting the capillary.

[0010] As a preferred solution of the pressure taking device described in the present invention, the pressure pipeline also includes a wedge block arranged inside and threads arranged on the inner walls of the pipeline on both sides; and the connecting flanges on both sides are threadedly connected to the pressure pipeline through the threads.

[0011] As a preferred solution of the pressure taking device described in the present invention, the wedge-shaped block extends and protrudes along the diameter direction of the pressure pipe, and is at a certain distance from the inner wall of the pressure pipe opposite to the extending direction.

[0012] As a preferred solution of the pressure taking device described in the present invention, flow blocking surfaces are symmetrically arranged on both sides of the wedge block, and the flow blocking surfaces on both sides are inclined towards each other and then intersect.

[0013] As a preferred solution of the pressure taking device described in the present invention, the angle formed by the intersection of the flow blocking surfaces on both sides is 0 to 90 degrees.

[0014] Beneficial effects of the present invention: The present invention can measure the differential pressure of a pipeline, and balance the pressure at both ends of the pressure-taking pipeline through a vent valve, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0016] Figure 1 This is a schematic diagram of the overall structure of the pressure taking device according to the first embodiment of the present invention;

[0017] Figure 2 It is a structural schematic diagram of a pressure taking assembly in a pressure taking device according to a first embodiment of the present invention;

[0018] Figure 3 It is a schematic cross-sectional structural diagram of the pressure taking assembly according to the first embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the overall structure of the connecting pipeline according to the first embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the overall structure of the pressure pipeline according to the first embodiment of the present invention;

[0021] Figure 6 It is a schematic cross-sectional structural diagram of the pressure pipeline according to the first embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the application position structure of the docking assembly according to the second embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of the overall exploded structure of the docking assembly according to the third embodiment of the present invention;

[0024] Fig. 9 A schematic diagram of the expanded structure of the mounting portion in the docking assembly according to the third embodiment of the present invention;

[0025] Fig.10 It is a schematic diagram of the closed structure of the mounting portion in the docking assembly according to the third embodiment of the present invention;

[0026] Fig.11 It is a schematic diagram of the exploded structure of the rotating part in the docking assembly according to the third embodiment of the present invention;

[0027] Fig.12 It is a schematic diagram of an exploded structure of a rotating part in a docking assembly according to a third embodiment of the present invention from another perspective;

[0028] Fig.13 It is a partially enlarged schematic diagram of the docking assembly described in the third embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1

[0036] Reference Figures 1 to 6As shown in the figure, in the field of differential pressure measurement, there are many situations where double flange diaphragm isolation pressure is required. However, how to vent, how to balance the two sides, and how to clean have always been difficult to solve. If the gas is involved in the contact between the medium and the diaphragm when measuring liquid, it will have a negative impact on the measurement accuracy; if the diaphragm is attached with dirt when measuring dirty and viscous media, it will also have a negative impact on the measurement accuracy; if the medium does not flow after installation, resulting in differential pressure on both sides, it will also have a negative impact on the measurement accuracy. It is not very convenient for customers to manually reset the transmitter. Therefore, a pressure taking device is proposed in this embodiment, including a connecting pipe 100, a pressure taking assembly 200 and a vent valve 300. Specifically, the connecting pipe 100 also includes a connecting flange 101 arranged at both ends, a pressure pipe 102 arranged in the middle, and a pressure taking pipe 103 symmetrically arranged on the sides of both ends and connected; a pressure taking assembly 200, the pressure taking assembly 200 is connected to the pressure taking pipe 103 arranged at both ends, and is used to measure the fluid pressure of the connecting pipe 100.

[0037] Furthermore, the pressure taking assembly 200 further includes an annular positioning body 201, a venting pipe 202 and a pressure transmitter 203; one side of the annular positioning body 201 is connected to the pressure taking pipe 103, the pressure transmitter 203 is connected to the other side of the annular positioning body 201 through a capillary 204 filled with fluid, the venting pipe 202 is arranged above the annular positioning body 201 and is connected thereto, and a venting valve 300 is arranged between the venting pipes 202 on both sides. At the same time, in this embodiment, the annular positioning body 201 further includes a measuring chamber 201a, an upper channel 201b and a lower channel 201c, a flushing valve 201d, a positioning flange 201e and a joint 201f; the measuring chamber 201a is connected to the pressure taking pipe 103, the upper channel 201b and the lower channel 201c are respectively arranged above and below the measuring chamber 201a and are connected, and the upper channel 201b is connected to the venting pipe 202. The flushing valve 201d is arranged below the measuring chamber 201a and communicated with the lower channel 201c. The positioning flange 201e is arranged on one side of the measuring chamber 201a and communicated with the pressure taking pipeline 103 through the pressure taking flange 103a. The connector 201f is used for connecting the capillary tube 204.

[0038] Furthermore, the pressure pipe 102 also includes a wedge block 102a arranged inside and threads 102b arranged on the inner walls of the pipes on both sides; and the connecting flanges 101 on both sides are connected to the pressure pipe 102 by threaded docking through the threads 102. The wedge block 102a extends and protrudes along the diameter direction of the pressure pipe 102, and is at a certain distance from the inner wall of the pressure pipe 102 opposite to the extension direction. In this embodiment, the two sides of the wedge block 102a are also symmetrically provided with flow blocking surfaces 102c, and the flow blocking surfaces 102c on both sides are inclined towards each other and then intersected. As a preferred embodiment of this embodiment, the angle formed by the intersection of the flow blocking surfaces 102c on both sides is 0 to 90 degrees. It should be noted that the pressure transmitter 203 used in this embodiment is an existing pressure transmitter of model 3051C. Here, it can be realized by referring to the existing technology. The main function is to transmit the pressure signal to the electronic device, and then display the pressure on the computer. The principle is roughly: convert the mechanical signal of water pressure into an electronic signal such as current (4-20mA). The pressure and voltage or current are linearly related, generally proportional. Therefore, the voltage or current output by the transmitter increases with the increase of pressure. From this, a relationship between pressure and voltage or current is obtained. The two pressures of the measured medium of the pressure transmitter are passed into the high and low pressure chambers. The pressure of the low pressure chamber adopts atmospheric pressure or vacuum, which acts on the isolation diaphragms on both sides of the delta element (i.e., the sensitive element) and is transmitted to both sides of the measuring diaphragm through the isolation plate and the filling liquid in the element. The pressure transmitter is composed of a capacitor composed of the measuring diaphragm and the electrodes on the insulating plates on both sides. When the pressure on both sides is inconsistent, the measuring diaphragm is displaced, and its displacement is proportional to the pressure difference, so the capacitance on both sides is not equal, through the oscillation and demodulation ring. The electrical component that senses the pressure of the pressure transmitter is generally a resistance strain gauge, which is a sensitive device that converts the pressure on the measured piece into an electrical signal. The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. Metal resistance strain gauges are further divided into two types: filamentary strain gauges and metal foil strain gauges. Usually, the strain gauge is tightly bonded to the mechanical strain matrix through a special adhesive. When the matrix is ​​subjected to stress changes, the resistance strain gauge also deforms, causing the resistance value of the strain gauge to change, thereby changing the voltage applied to the resistor. In this embodiment, the fluid medium flowing in the pressure-taking pipeline 103 after installation is emptied and filled with the capillary 204. Therefore, when a pressure difference occurs in the pressure-taking pipeline 103, the capillary 204 on both sides connected to the measuring chamber 201a is pushed to transport the medium liquid, so that the other end of the capillary 204 on both sides will push the measuring diaphragm of the pressure transmitter to cause it to displace, and its displacement is proportional to the pressure difference. After being converted into pressure data through the pressure transmitter 203, the pressure is displayed on the digital display screen.At the same time, the pressure taking device proposed in this embodiment can, when measuring liquid, open the vent valve 300 to vent the medium when the medium and the diaphragm are involved in the contact, thereby ensuring the measurement accuracy; after installation, the medium does not flow and a differential pressure is formed on both sides, open the vent valve 300 to balance the pressure on both sides and then close the valve body to ensure the measurement accuracy; and enable customers to solve this problem more easily; when measuring dirty and viscous media, regularly open the flushing valve 201d, and connect the external steam flushing port to achieve the purpose of flushing to ensure the measurement accuracy. In summary, the device solves the problems of venting, flushing, and balancing during diaphragm pressure taking, and better ensures the measurement accuracy. The vent valve 300 solves the problem that when measuring liquid, the medium and the diaphragm are involved in the contact, which affects the measurement accuracy; solves the problem that when measuring dirty and viscous media, the diaphragm is attached with dirt, which affects the measurement accuracy; solves the problem that after installation, the medium does not flow and forms a differential pressure on both sides, which affects the measurement, and is more convenient for customers to use. It should also be noted that in this embodiment, the docking between pipelines, such as the docking between the pressure-taking pipeline 103 and the annular positioning body 201, is achieved through the positioning flange 201e and the pressure-taking flange 103a, and a rubber ring for sealing must be provided between the two, or the docking between the vent valve 300 and the vent pipeline 202 can be achieved through an embedded flange and a rubber ring seal. Therefore, the docking and sealing of the pipelines in this embodiment can be achieved by those skilled in the art by referring to the prior art and will not be described in detail here.

[0039] Example 2

[0040] Reference Figure 7As shown in the diagram, in the first embodiment, during use, the vent valve 300 needs to be installed in communication with the vent pipes 202 at both ends thereof. After the three-way pipes are installed at both ends of the wedge-shaped pipe (i.e., the pressure pipe 102), the distance between the vent pipes 202 at both ends is determined immediately. Therefore, during the process of installing the vent valve 300 between the two vent pipes 202, for the vent valve 300 of a fixed length, if the length of the vent valve 300 is less than the distance between the two vent pipes 202, when the vent valve 300 is placed, there will be a distance gap at the joint of the two pipes, so that the extrusion force between them will also be insufficient due to the existence of the gap, affecting the sealing performance of the pipe joint. However, if the length of the vent valve 300, that is, the length of the balance pipes 301 at both ends is increased, that is, greater than the distance between the two vent pipes 202, this can indeed increase the extrusion force between the vent valve 300 and the vent pipe 202, thereby increasing the sealing when the pipes are connected. However, the length is too long. During installation, for example, the left end of the vent valve 300 needs to be squeezed toward the vent pipe 202 until the right end of the vent valve 300 can be inserted into the vent pipe 202 on the right. Therefore, in this case, the operator will have a lot of effort during installation, and the process is relatively complicated and cumbersome, which greatly consumes work efficiency. In response to the above problems, a pipeline docking assembly 400 is also proposed in the present embodiment. The docking assembly 400 is arranged at both ends of the vent valve 300, and is used for quick docking of the vent valve 300 and the vent pipes 202 on both sides thereof. It not only has good sealing performance, but also can adapt to the installation of vent valves 300 of different lengths within a certain range on the vent pipe 202, as well as the convenient disassembly, cleaning, replacement and maintenance of the vent valve 300.

[0041] Specifically, the docking assembly 400 includes a mounting portion 401 and a rotating portion 402, wherein the mounting portion 401 is installed by being sleeved on the edges of the pipes at both ends of the vent valve 300 and fixes the two so that they cannot rotate relative to each other, the rotating portion 402 is inserted into the pipe of the vent valve 300 and cooperates with the mounting portion 401 to rotate relative to each other, and the pipe ends of the vent pipes 202 on both sides are inserted into the rotating portion 402.

[0042] Furthermore, the mounting portion 401 also includes an open ring 401a, which is sleeved on the pipe end of the vent valve 300, and the upper end of the open ring 401a extends toward one side of the rotating portion 402 and forms a recessed portion 401b between the open ring 401a and the side surface of the pipe of the vent valve 300. The rotating part 402 also includes an inner embedded part 402a and an outer embedded part 402b extending in the direction of the mounting part 401. The outer embedded part 402b extends from the side end surface of the rotating part 402 in the direction of the mounting part 401, and its inner diameter and extended thickness are equal to the recessed thickness of the recessed part 401b; the inner embedded part 402a is arranged on the outer embedded part 402b and extends in the direction of the mounting part 401, and the inner diameter of the inner embedded part 402a is adapted to the inner diameter of the pipe openings 303 on both sides of the vent valve 300; in this embodiment, the rotating part 402 is further provided with a ring opening 402c facing away from the mounting part 401, and the groove size of the ring groove 402c is adapted to the pipe wall thickness of the pipe extending outward from the vent pipe 202, that is, the vent pipe 202 extends outward to form an embedded ring block 202a, and the embedded ring blocks 202a symmetrical at both ends are connected by being embedded in the ring opening 402c. In this embodiment, for the convenience of installation, first, the open ring 401a is first sleeved on the flanges on both sides of the vent valve 300 to complete the installation therebetween, which is the installation of the mounting portion 401 on the vent valve 300; then the embedded portion 402a is embedded in the pipe opening 303 until the outer embedded portion 402b is correspondingly embedded in the recessed portion 401b and limited, and in order to achieve better sealing, a first sealing ring 404 is also provided between the embedded portion 402a and the pipe opening 303, which is the docking installation between the mounting portion 401 and the rotating portion 402, and a certain amount of expansion and contraction can occur between the mounting portion 401 and the rotating portion 402; finally, due to the telescopic movement between the mounting portion 401 and the rotating portion 402, the vent pipe 202 can be easily extended outward and inserted into the ring opening 402c, and a second sealing ring 403 is also provided in the groove of the ring opening 402c for sealing performance to complete the docking between the vent pipe 202 and the rotating portion 402. The two sides of the vent valve 300 are symmetrical and are installed in the same way. Therefore, after the above installation process, the balance pipes 301 on both sides of the vent valve 300 can be conveniently installed and docked with the vent pipe 202 through the docking assembly 400.

[0043] Example 3

[0044] Reference Figures 8 to 13, the present embodiment is different from the previous embodiment in that: a rotation adjustment is proposed to realize the telescopic movement between the mounting part 401 and the rotating part 402 for the docking mode between the vent valve 300 and the vent pipe 202, so as to realize the adaptation to the vent valves 300 of different lengths, and enable the vent valves 300 of different lengths to have better sealing performance. Therefore, the mounting part 401 also includes a fixed extension part 401c, a locking part 401d, a telescopic part 401e, an elastic part 401f and a limiting groove 401g; and the rotating part 402 matched with the mounting part 401 also includes a spring column 402d, a limiting shaft 402e, a rotating ring 402f, a toggle tooth 402g and a handle 402h. More specifically, the open ring 401a in this embodiment is a symmetrical half ring connected by two rotating shafts. When the open ring 401a is opened, the flange parts at both ends of the balance guide tube 301 are locked and limited by being embedded in the limit grooves 401g. It should be noted that the limit grooves 401g can be provided with protrusions to limit the relative rotation between the open ring 401a and the balance guide tube 301. And by closing the other half of the open ring 401a, the other half of the open ring 401a is sleeved on the flanges at both ends of the balance guide tube 301. When the open ring 401a is closed, it is locked by the locking part 401d. In order to achieve quick locking, the locking part 401d in this embodiment includes two partial blocks respectively arranged on the two half rings. The card slot 401d-1 can be set on any one of the partial blocks, and the compression card block 401d-2 is set on the surface of the other partial block. The compression card block 401d-2 has a guide surface. When one of the partial blocks merges with the other partial block, the partial block can press the compression card block 401d-2 into the partial block until it is parallel to its upper surface due to the action of the guide surface. The partial block continues to move until the compression card block 401d-2 corresponds to the position of the card slot 401d-1. The compression card block 401d-2 pops up and is inserted into the card slot 401d-1 to limit the two merged partial blocks. Furthermore, in order to achieve convenient unlocking, a button 401d-3 connected to the card slot 401d-1 is also provided on the partial block with the card slot 401d-1. The button 401d-3 penetrates the partial block and enters the card slot 401d-1, and interferes with the compression card block 401d-2. The operator presses the button 401d-3 to squeeze the compression card block 401d-2 downward, thereby removing the merged partial blocks to achieve unlocking of the locking part 401d.Furthermore, a fixed extension portion 401c extending outward along the edge is also provided on the mounting portion 401, and a telescopic portion 401e and an elastic portion 401f are provided on the fixed extension portion 401c, and one or more groups of telescopic portions 401e and elastic portions 401f are symmetrically provided on the two semi-rings; and the elastic portion 401f is a spring fixedly provided on the fixed extension portion 401c, and the telescopic portion 401e also includes a gear 401e-1 and a stud 401e-2, and the stud 401e-2 is fixedly provided on the fixed extension portion 401c, and the gear 401e-1 is threadably mounted on the stud 401e-2, that is, through the rotation of the gear 401e-1, it can be telescoped back and forth relative to the stud 401e-2.

[0045] Furthermore, in order to achieve the cooperation between the rotating part 402 and the mounting part 401, the rotating part 402 is actually a disk, and a spring column 402d corresponding to the elastic part 401f is arranged on the disk surface facing the mounting part 401, and the spring column 402d is inserted into the spring ring to complete the limit. At the same time, a limit shaft 402e is also arranged on the disk surface of the mounting part 401, and the limit shaft 402e is divided into two limit parts. The gear 401e-1 can be embedded on the bottom axis of the limit shaft 402e to rotate, and the limit shaft 402e also has an extension shaft part, which can be inserted into the limit hole 401e-3 set on the stud 401e-2, and the limit hole 401e-3 is a flat shaft. Therefore, the gear 401e-1 can rotate relative to the limit shaft 402e, while the stud 401e-2 cannot rotate relative to the limit shaft 402e due to the limit of the extension shaft, thereby fixing the rotation of the mounting part 401. Furthermore, the rotating part 402 further includes a rotating ring 402f disposed on its edge and capable of rotating relative to the rotating part 402, a toggle tooth 402g corresponding to the gear 401e-1 is disposed on the side of the rotating ring 402f facing the mounting part 401, and a handle 402h extending outward is disposed on the annular surface of the rotating ring 402f, and the operator rotates the rotating ring 402f through the handle 402h to drive the toggle tooth 402g to rotate, thereby the toggle tooth drives the gear 401e-1 to rotate. In this embodiment, since the mounting part 401 is fixed, the stud 401e-2 disposed thereon is fixed and cannot rotate, so that the mounting part 401 cannot rotate, and only the gear 401e-1 can rotate, so the gear 401e-1 is telescopically displaced relative to the stud 401e-2, and the gear 401e-1 contacts the side end surface of the mounting part 401, so that the distance between the mounting part 401 and the rotating part 402 can be adjusted.

[0046] The installation process of the docking assembly 400 in this embodiment is as follows: first, open the open ring 401a and insert it into the flanges at both ends of the balance guide pipe 301, then close the open ring 401a and lock it through the locking part 401d, and then limit the rotation part 402 through the corresponding relationship between the spring column 402d and the limit shaft 402e. After the installation is completed, it can be appropriately adjusted according to the actual size of the balance guide pipe 301, that is, first turn the handle 402h, adjust the distance between the installation part 401 and the rotating part 402 to be smaller, and then insert the pipe extending from the venting pipe 202 into the ring mouth 402c. The other side is similar, and the distance can be adjusted according to the actual length. When both sides are installed, due to the previous distance adjustment operation, the sealing performance of the pipe docking is reduced due to the small extrusion force, so it is necessary to reverse the handle 402h, increase the distance between the installation part 401 and the rotating part 402, increase the extrusion force at the pipe connection, and increase the sealing performance of the pipe docking. When disassembly is required, the installation operation can be reversed. Therefore, this embodiment can not only solve the problem of difficult installation of pipes with different lengths, but also has good sealing performance and can adapt to the spacing between pipes of different lengths for convenient installation, disassembly, cleaning and maintenance.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pressure taking device, Features: include, A connecting pipeline (100), the connecting pipeline (100) further comprising connecting flanges (101) arranged at both ends thereof, a pressure pipeline (102) arranged in the middle thereof, and pressure-taking pipelines (103) symmetrically arranged on the side surfaces of both ends thereof and communicating with each other; A pressure taking assembly (200), the pressure taking assembly (200) being in communication with the pressure taking pipelines (103) arranged at both ends, and being used to measure the fluid pressure of the connecting pipeline (100); The pressure taking assembly (200) further comprises an annular positioning body (201), a venting pipeline (202) and a pressure transmitter (203); One side of the annular positioning body (201) is in communication with the pressure-taking pipeline (103); the pressure transmitter (203) is in communication with the other side of the annular positioning body (201) via a capillary tube (204) filled with fluid; the venting pipeline (202) is arranged above the annular positioning body (201) and in communication with the annular positioning body (201); and a venting valve (300) is arranged between the venting pipelines (202) on both sides; The vent valve (300) comprises balance guide pipes (301) arranged at both ends thereof; A docking assembly (400) comprising a mounting portion (401) and a rotating portion (402); The mounting portion (401) comprises an open ring (401a); The mounting portion (401) further comprises a fixed extension portion (401c), a locking portion (401d), a telescopic portion (401e), an elastic portion (401f), and a limiting groove (401g); The rotating part (402) matched with the mounting part (401) comprises a spring column (402d), a limiting shaft (402e), a rotating ring (402f), a toggle tooth (402g), and a handle (402h); The mounting portion (401) is installed by being sleeved on the edges of the pipes at both ends of the vent valve (300) and fixes the two so that they cannot rotate relative to each other; the rotating portion (402) is inserted into the pipe of the vent valve (300) and rotates relative to the mounting portion (401); the pipe ends of the vent pipes (202) at both sides are inserted into the rotating portion (402); The open ring (401a) is a symmetrical semi-ring body connected by two rotating shafts. When the open ring (401a) is opened, the flange parts at both ends of the balance guide tube (301) are engaged and limited by being embedded in the limit grooves (401g). The locking portion (401d) comprises two partial blocks respectively arranged on two half rings, wherein a card slot (401d-1) is arranged on any one of the partial blocks, and a compression card block (401d-2) is arranged on the surface of the other partial block, and the compression card block (401d-2) has a guide surface; The mounting portion (401) is also provided with a fixed extension portion (401c) extending outward along the edge, and the fixed extension portion (401c) is provided with a telescopic portion (401e) and an elastic portion (401f), and one or more groups of telescopic portions (401e) and elastic portions (401f) are symmetrically provided on the two half rings; the elastic portion (401f) is a spring fixedly provided on the fixed extension portion (401c), and the telescopic portion (401e) further comprises a gear (401e-1) and a stud (401e-2), the stud (401e-2) is fixedly provided on the fixed extension portion (401c), and the gear (401e-1) is sleeved on the stud (401e-2) in threaded engagement, that is, through the rotation of the gear (401e-1), the gear (401e-1) can be telescoped forward and backward relative to the stud (401e-2); A limiting shaft (402e) is also provided on the disk surface of the mounting portion (401), and the limiting shaft (402e) is divided into two limiting parts. The gear (401e-1) can be embedded in the bottom shaft of the limiting shaft (402e) to rotate, and the limiting shaft (402e) also has an extended shaft part, and the extended shaft part can be inserted into a limiting hole (401e-3) provided on the stud (401e-2), and the limiting hole (401e-3) is a flat shaft. The rotating part (402) further comprises a rotating ring (402f) arranged on its edge and capable of relative rotation therewith, a shifting tooth (402g) corresponding to the gear (401e-1) being arranged on the side of the rotating ring (402f) facing the mounting part (401), and a handle (402h) extending outwardly being arranged on the annular surface of the rotating ring (402f).

2. The pressure taking device according to claim 1, Features: The annular positioning body (201) further comprises a measuring chamber (201a), an upper channel (201b) and a lower channel (201c); The measuring chamber (201a) is in communication with the pressure-taking pipeline (103), the upper channel (201b) and the lower channel (201c) are respectively arranged above and below the measuring chamber (201a) and are in communication with each other, and the upper channel (201b) is in communication with the venting pipeline (202).

3. The pressure taking device according to claim 2, Features: The annular positioning body (201) further comprises a flushing valve (201d), a positioning flange (201e) and a joint (201f); The flushing valve (201d) is arranged below the measuring chamber (201a) and is connected to the lower channel (201c); the positioning flange (201e) is arranged on one side of the measuring chamber (201a) and is connected to the pressure taking pipeline (103) via a pressure taking flange (103a); and the joint (201f) is used for connecting the capillary tube (204).

4. The pressure taking device according to any one of claims 1 to 3, Features: The pressure pipe (102) further comprises a wedge-shaped block (102a) arranged inside and threads (102b) arranged on the inner walls of the pipe on both sides; and the connection flanges (101) on both sides are connected to the pressure pipe (102) by threaded docking via the threads (102b).

5. The pressure taking device according to claim 4, Features: The wedge-shaped block (102a) extends and protrudes along the diameter direction of the pressure pipe (102), and is at a certain distance from the inner wall of the pressure pipe (102) opposite to the extending direction.

6. The pressure taking device according to claim 5, Features: Flow blocking surfaces (102c) are also symmetrically arranged on both sides of the wedge-shaped block (102a), and the flow blocking surfaces (102c) on both sides are inclined towards each other and then intersect.

7. The pressure taking device according to claim 6, Features: The angle formed by the intersection of the flow blocking surfaces (102c) on both sides is 0 to 90 degrees.

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