Fluid introduction structure and sensor

Abstract

The invention relates to a fluid introduction structure and a sensor. Wherein the fluid introducing structure comprises a fluid channel; the restraining assembly restrains pressure pulses entering the fluid channel. Wherein an interface tube of the sensor is configured or connected to the fluid introduction structure. According to the fluid introduction structure and the sensor thereof, the pressure pulse can be suppressed, and damage caused by the pressure pulse is avoided.

Description

Technical Field

[0001] The invention relates to the field of sensor technology, and in particular to a fluid introduction structure and a sensor thereof. Background Art

[0002] Pressure sensor is a sensor used to measure the pressure of the pressure medium to be measured. It is widely used in various industrial automatic control environments, involving many industries such as oil pipelines, water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, hydraulic machinery, etc. This type of pressure sensor includes piezoresistive pressure sensors, capacitive pressure sensors, etc. Among them, piezoresistive pressure sensors usually include a diaphragm that can receive pressure and generate corresponding strain and a measurement circuit composed of strain elements arranged on the diaphragm, so as to measure the pressure of the medium by measuring the strain degree of the diaphragm.

[0003] The pressure of the medium to be measured may easily generate excessive pressure on the pressure sensitive element during an instantaneous pressure pulse, thereby damaging the pressure sensor. For example, the liquid in the pipeline will produce a water hammer effect when the valve is opened or closed, causing the pressure in the pipeline to increase several times instantly. Summary of the invention

[0004] In view of this, a first aspect of the present invention provides a fluid introduction structure so as to effectively suppress pressure pulses when fluid passes through.

[0005] Wherein, the fluid introduction structure is used to introduce the fluid to be tested, and includes: a fluid channel for introducing a fluid to be measured; The suppression component is arranged in the fluid channel to suppress the pressure pulse entering the fluid channel.

[0006] Among them, the suppression components include, At least one first inhibitor is connected in the fluid channel, and the first inhibitor is used to partially offset the pressure pulse entering the fluid channel.

[0007] Wherein, the first inhibitor includes at least one flow-blocking block; The baffle blocks the fluid channel, and the baffle constructs a main channel and a recoil channel; The main channel is connected to two sides of the baffle block; The inlet of the recoil channel is in communication with the drainage side of the fluid channel, and the outlet is in communication with the interior of the main channel; The outlet direction of the recoil channel forms an obtuse angle with the flow direction of the main channel.

[0008] Wherein, at least two of the flow blocking blocks respectively block different upstream and downstream areas of the fluid channel.

[0009] Wherein, at least two of the baffle blocks are combined to block the same horizontal area of ​​the flow channel.

[0010] Wherein, the suppression component comprises: At least one second inhibitor is connected in the fluid passage, and the second inhibitor absorbs pressure pulses entering the fluid passage.

[0011] The second suppression member forms at least one first suppression cavity in the fluid channel, and the first suppression cavity absorbs and then slowly releases the pressure pulse.

[0012] Wherein, the suppression component comprises: At least one third inhibitor is connected in the fluid channel, and the third inhibitor absorbs pressure pulses entering the fluid channel.

[0013] Wherein, the first inhibiting member and the third inhibiting member are connected in sequence along the flow direction of the fluid channel.

[0014] The present invention provides a sensor. Wherein, the interface tube of the sensor is constructed or connected with the fluid introduction structure.

[0015] Compared with the prior art, the fluid introduction structure and the sensor thereof of the present invention can suppress pressure pulses and avoid damage caused by instantaneous pressure pulses. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of the sensor in the first embodiment is shown; Figure 2 A schematic structural diagram of an implementation method of a flow blocking block is shown; Figure 3 A schematic structural diagram of an embodiment of a first suppression member is shown; Figure 4 A schematic structural diagram of an embodiment of a first suppression member is shown; Figure 5 A schematic structural diagram of an embodiment of a first suppression member is shown; Figure 6 A schematic structural diagram of a fluid introduction structure in a second embodiment is shown; Figure 7 A schematic structural diagram of an embodiment of an elastic compression member is shown; Figure 8 A schematic structural diagram of the fluid introduction structure in the third embodiment is shown.

[0017] Description of reference numerals: 10. Shell; 11. Upper shell; 12. Lower shell; 101. Mounting cavity; 102. Fluid channel; 103. Interface channel; 20. Detection element; 21. Base; 22. Circuit board; 23. Sensitive element; 30. Fluid introduction structure; 31. Flow block; 311. Main channel; 312. Recoil channel; 32. Elastic compression member; 321. Foam tube; 322. Elastic airbag; 3221. Center hole; 40. Interface terminal; 51. Upper mounting block; 511. Upper mixing chamber; 52. Lower mounting block; 521. Lower mixing chamber; 531. First separation ring; 532. Second separation ring; 501. Flow block. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0020] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0021] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0022] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0023] See also Figure 1 The sensor of this embodiment includes a housing 10. The housing 10 has an installation cavity 101 therein, which includes an interface tube for introducing the fluid to be measured into the installation cavity 101. The fluid introduction structure 30 of this embodiment is formed at the interface tube, which is used to Figure 1 The fluid that forms the pressure pulse is introduced into the fluid channel 102 (upward in the direction of the fluid being introduced, which can also be said to be backward or downstream according to the flow direction of the introduced fluid) to buffer and suppress the fluid. The fluid introduction structure 30 includes a fluid channel 102 formed in the interface tube.

[0024] The sensor further includes a detection element 20 disposed in the mounting cavity 101. The detection element 20 is sealed at one end of the inner side of the fluid channel 102 (i.e. Figure 1 The sensor may be a pressure sensor, and the detection element 20 may be used to measure the pressure of the fluid to be measured, which may include a base 21 for sealing to one end of the inner side of the fluid channel 102 and a sensitive element 23 for measuring the fluid pressure, and the base 21 is provided with a fluid through hole, one end of the fluid through hole is connected to the upper end of the fluid channel 102, and the other end is blocked by the sensitive element 23. In some other schemes, the sensor may also be other types of sensors for measuring at least one physical quantity of the fluid. The housing 10 may include a lower shell 12 and an upper shell 11 connected together. The interface tube may be integrally connected to the lower part of the lower shell 12. A circuit board 22 may be provided on one side of the base 21 away from the fluid channel 102, and the circuit board 22 is electrically connected to the above-mentioned sensitive element 23 and is electrically connected to a plurality of interface terminals 40 fixed on the upper shell 11. The fluid introduction structure includes a suppression component arranged in the fluid channel 102. The suppression component includes a first suppression member arranged in the fluid channel 102. The first suppressor is used to suppress the fluid introduced from the fluid channel 102 , thereby protecting the detection element 20 on the upper side.

[0025] The first inhibitor includes a flow block 31. The flow block 31 is configured with a main channel 311 and a recoil channel 312, and the recoil channel 312 is used to recoil the fluid in the fluid channel 102. For example, the inlet directions of the recoil channel 312 and the main channel 311 can be set to be vertically upward (open downward), and the recoil channel 312 can be configured to be connected to the main channel 311 after turning an obtuse angle along a certain path relative to the fluid direction of its inlet, so that the angle between the fluid flow direction in the recoil channel 312 and the fluid flow direction in the main channel 311 (vertically upward) at the connection point between the two is an obtuse angle, that is, the fluid flow direction in the recoil channel 312 at this point has a downward component, thereby blocking the fluid in the main channel 311 (i.e., consuming the kinetic energy of the fluid), thereby suppressing the pressure pulse shape, or at least partially offsetting the pressure pulse.

[0026] The main channel 311 can pass through the baffle block 31, with the inlet facing the inlet of the fluid introduction structure 30, and the outlet facing the installation cavity 101. The inlet of the recoil channel 312 faces the inlet of the fluid introduction structure 30, and the outlet is connected to the middle section of the main channel 311 inside the baffle block 31. At least a part of the outlet direction of the recoil channel 312 is opposite to the flow path of the main channel 311. The flow direction of the main channel 311 refers to the flow path of the fluid from the inlet to the outlet of the main channel 311. When a pressure pulse occurs, the fluid enters the main channel 311 and the recoil channel 312 respectively. After the fluid passes through the recoil channel 312 and turns an obtuse angle, it will enter the main channel 311. The original fluid in the main channel 311 and the fluid entering the recoil channel 312 have a blocking effect, which consumes the kinetic energy of the fluid and increases the head loss. Optionally, the baffle block 31 is composed of two sub-baffle blocks spliced ​​left and right. The opposite sides of the two sub-blocks are configured with grooves for splicing the main channel 311 and the recoil channel 312 . After the two sub-blocks are spliced, the grooves thereof splice the main channel 311 and the recoil channel 312 .

[0027] Furthermore, the fluid introduction structure 30 may also include an upper mounting block 51 and a lower mounting block 52 for fixing the baffle block 31 from the upper and lower sides respectively. The upper mounting block 51 is fixedly connected in the fluid channel 102 and is configured with a rear choke hole. The lower mounting block 52 is movably connected in the fluid channel 102 and is configured with a front choke hole. The first suppression member is fixed between the upper mounting block 51 and the lower mounting block 52 to fix the baffle block 31 in the fluid channel 102. The lower mounting block 52, the baffle block 31 and the upper mounting block 51 form a suppression unit.

[0028] Meanwhile, an upper mixing chamber 511 is formed on one side of the upper mounting block 51 facing the first suppressor, and the rear choke hole is connected to the upper mixing chamber 511. The upper mixing chamber 511 forms a space between the upper mounting block 51 and the first suppressor for providing a certain buffer.

[0029] Similarly, Figure 2 It is shown that a lower mixing chamber 521 is formed on the side of the lower mounting block 52 facing the first inhibitor, and the rear choke hole is connected to the lower mixing chamber 521. The lower mixing chamber 521 is formed with a space that can be used to provide a certain buffer between the lower mounting block 52 and the first inhibitor. The choke holes are respectively arranged on the front and rear sides of the baffle block 31 (the upper and lower sides in the figure), so that the injected fluid rate can be limited, and the fluid can form turbulence in the mixing chamber through the mixing chamber, further consuming the internal energy of the fluid. Preferably, the lower mounting block 52 is installed on the port portion of the fluid channel 102 facing the outside by a threaded connection.

[0030] See also Figure 2 In some embodiments, the baffle block 31 has a main channel 311 and two recoil channels 312, and each recoil channel 312 is connected to the main channel 311. Also, the outlets of the recoil channels 312 are connected to the main channel 311 at intervals. In some other solutions, there may be three or more recoil channels 312.

[0031] See also Figure 3 In some embodiments, the first inhibitor may include at least two flow blocks 31. These two flow blocks 31 are connected in series in the fluid channel 102. When a pressure pulse occurs, each flow block 31 sequentially reduces the pressure pulse at different channel positions. A flow cavity is formed between two adjacent flow blocks 31 through the first separation ring 531, and the outlet of the previous flow block 31 is connected to the inlet of the next flow block 31 through the corresponding flow cavity.

[0032] See also Figure 4 In some embodiments, the first inhibitor includes at least two baffles 31. The overall outer contour of the horizontal combination of the baffles 31 matches the inner wall of the fluid channel 102. When a pressure pulse occurs, each baffle 31 blocks the pressure pulse at different horizontal cross-sectional positions at the same time.

[0033] See also Figure 5 In some embodiments, the first suppression assembly may include at least one flow block 31 and one flow block 501. The overall outer contour of the flow block 31 and the flow block 501 after being horizontally combined matches the inner wall of the fluid channel 102. When a pressure pulse occurs, the flow block 31 blocks the pressure pulse at the channel position, and the flow block 501 allows the fluid to be measured to pass to the detection element 20.

[0034] See also Figure 6 In the second embodiment, the suppression assembly includes a second suppression member. The second suppression member is used to absorb and gradually release the pressure pulse entering the fluid channel 102 in the fluid channel 102 .

[0035] The second suppression member includes an elastic compression member 32. The elastic compression member 32 forms at least one deformable first suppression cavity in the fluid channel 102. The first suppression cavity can absorb and then slowly release the pressure pulse.

[0036] The elastic compression member 32 includes a foam tube 321 that is deformed by pressure. The foam tube 321 is connected to the fluid channel 102. The foam tube 321 is configured with a through hole. The foam tube 321 is fixed in the fluid channel 102 by the upper mounting block 51 and the lower mounting block 52. When a pressure pulse occurs, the foam tube 321 can be regarded as having a first suppression chamber. When compressed, the foam tube 321 cedes more volume space to the fluid channel 102. After the pressure pulse ends, the foam tube 321 recovers its deformation and occupies the volume space of the fluid channel 102.

[0037] See also Figure 7 In some embodiments, the elastic compression member 32 includes a hollow annular elastic airbag 322, and a central hole 3221 is left in the middle of the elastic airbag 322 for fluid to pass up and down. The elastic airbag 322 is connected to the fluid channel 102. When a pressure pulse occurs, the elastic airbag 322 can be regarded as having a first suppression cavity. When the elastic airbag 322 is subjected to external pressure, the gas in the elastic airbag 322 is compressed. When the elastic airbag 322 is compressed, more volume space can be transferred to the fluid channel 102. After the pressure pulse ends, the elastic airbag 322 returns to its original shape and occupies the volume space of the fluid channel 102.

[0038] Preferably, the periphery of the elastic airbag 322 may be fixed to the inner wall 102 of the fluid channel.

[0039] In some embodiments, the second suppressor includes at least two elastic compression members 32. The at least two elastic compression members 32 are respectively connected to different channel positions of the fluid channel. When a pressure pulse occurs, each elastic compression member 32 absorbs and slowly releases the pressure pulse in different channel positions in turn.

[0040] In some embodiments, the second suppressor includes at least two elastic compression members 32. At least two elastic compression members 32 are connected to the same channel position of the fluid channel. When a pressure pulse occurs, each elastic compression member 32 absorbs and slowly releases the pressure pulse at the same channel position.

[0041] Preferably, at least two elastic compression members 32 at the same channel position block the fluid channel when they are not deformed, and release the channel to allow the fluid to pass through when they are deformed.

[0042] See also Figure 8In the third embodiment, the fluid introduction structure 30 includes a suppression component. The suppression component includes a first suppression member and a third suppression member. The first suppression member may be the same as the first embodiment, and is used to reduce and suppress the pressure pulse entering the fluid channel 102 in the fluid channel 102. The third suppression member may be the same as the second suppression member in the second embodiment, and is used to absorb and slowly release the pressure pulse entering the fluid channel 102 in the fluid channel 102.

[0043] The first inhibitor may be a flow block 31. The third inhibitor may be an elastic compression member 32, such as a foam tube 321, an elastic airbag 322, or an elastic film and a combination thereof with the inner wall of the fluid channel 102. Figure 6 The foam tube 321 is taken as an example.

[0044] Furthermore, the first suppressor and the third suppressor are connected in sequence along the flow direction of the fluid channel. When a pressure pulse occurs, the first suppressor first reduces the pressure pulse. The third suppressor then absorbs and gradually releases the reduced pressure pulse, thereby avoiding damage to the sensitive element by the instantaneous pressure pulse.

[0045] Furthermore, the first inhibiting member and the third inhibiting member are connected to the fluid channel 102 by being spaced apart by the second separation ring 532 .

[0046] In some embodiments, the third inhibitor is connected to the first inhibitor in sequence along the flow direction of the fluid channel. When a pressure pulse occurs, the third inhibitor first absorbs and gradually releases the pressure pulse, and the first inhibitor reduces the unabsorbed pressure pulse after the third inhibitor absorbs part of the pressure pulse, and the third inhibitor continues to reduce the slowly released pressure pulse when the first inhibitor slowly releases the absorbed part of the pressure pulse.

[0047] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The interface pipe of the sensor is constructed or connected with the fluid introduction structure. Compared with the prior art, the fluid introduction structure and the sensor of the present invention can suppress the pressure pulse and avoid damage caused by the instantaneous pressure pulse.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fluid introduction structure for introducing a fluid to be tested, characterized in that: include, a fluid channel for introducing a fluid to be measured; The suppression component is arranged in the fluid channel to suppress the pressure pulse entering the fluid channel.

2. A fluid introduction structure according to claim 1, characterized in that: The suppression components include, At least one first inhibitor is connected in the fluid channel, and the first protective member is used to offset the pressure pulse entering the fluid channel.

3. The fluid introduction structure according to claim 2, characterized in that: The first inhibitor includes at least one flow-blocking block; The baffle blocks the fluid channel, and the baffle constructs a main channel and a recoil channel; The main channel is connected to two sides of the baffle block; The inlet of the recoil channel is in communication with the drainage side of the fluid channel, and the outlet is in communication with the interior of the main channel; The outlet direction of the recoil channel forms an obtuse angle with the flow direction of the main channel.

4. The fluid introduction structure according to claim 3, characterized in that: At least two of the flow blocking blocks respectively block different upstream and downstream areas of the fluid channel.

5. The fluid introduction structure according to claim 2, characterized in that: At least two of the blocking blocks are combined to block the same area at the level of the flow channel.

6. The fluid introduction structure according to claim 1, characterized in that: The suppression assembly comprises, At least one second inhibitor is connected in the fluid passage, and the second inhibitor absorbs pressure pulses entering the fluid passage.

7. The fluid introduction structure according to claim 6, characterized in that: The second suppression member forms at least one first suppression chamber in the fluid channel, and the first suppression chamber absorbs and then slowly releases the pressure pulse.

8. The fluid introduction structure according to claim 2, characterized in that: The suppression assembly comprises, At least one third inhibitor is connected in the fluid channel, and the third inhibitor absorbs pressure pulses entering the fluid channel.

9. The fluid introduction structure according to claim 8, characterized in that: The first inhibiting member and the third inhibiting member are connected in sequence along a flow direction of the fluid channel.

10. A sensor, characterized in that: The interface tube of the sensor is constructed or connected with the fluid introduction structure as claimed in any one of claims 1 to 9.

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