Fluid introduction structure and sensor
By designing a fluid introduction structure in the pressure sensor, the blocking effect of the blocking element and the switching element and the buffer cavity are used to solve the problem of instantaneous pressure pulses destroying the sensor, and the effective detection of conventional pressure pulses is achieved.
Patent Information
- Application Number
- CN202411373095.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2024-12-20
AI Technical Summary
Existing pressure sensors are easily destroyed in the face of instantaneous pressure pulses, especially when the water hammer effect occurs when the liquid valve is opened or closed, causing instantaneous increase in pressure, damaging sensitive elements.
A fluid introduction structure is designed, including a fluid channel, a blocking element and a switching element. The blocking element consists of a main channel and a backlash channel. The switching element is flushed or expanded by the fluid when the pressure is too high, forming a blocking effect to slow down. Instant pressure difference, combining the step surface and the buffer cavity to buffer pressure pulses.
It effectively reduces the damage to sensitive components by instantaneously large pressure pulses, and ensures the detection ability of conventional pressure pulses, extends the service life of the sensor.
Smart Images
Figure CN119164544A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of sensor technology, and in particular to a fluid introduction structure and a sensor. 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, the present invention provides a fluid introduction structure.
[0005] Wherein, the fluid introduction structure comprises: a fluid channel for introducing a fluid to be measured; The flow-blocking element disposed in the fluid channel includes at least one flow-blocking structure; The flow-blocking structure includes a main channel and a recoil channel; The inlet and outlet of the main channel are respectively arranged on both sides of the baffle block; The inlet of the recoil channel is arranged on the same side as the inlet of the main channel, and the outlet is connected to the main channel; At the connection point between the main channel and the recoil channel, the outflow direction of the recoil channel forms an obtuse angle with the flow direction of the fluid in the main channel; At least one switch element disposed in the fluid channel and located outside the baffle block comprises a hole which is opened or expanded by the fluid when the pressure at the inlet of the recoil channel is too high.
[0006] Wherein, the flow-blocking element comprises at least two of the flow-blocking structures; At least two of the flow-blocking structures are combined to block the fluid channel.
[0007] Wherein, the flow-blocking structure comprises at least two of the recoil channels; The outlets of at least two of the recoil channels are connected to the same main channel.
[0008] Wherein, the switch element comprises a flow-blocking elastic body; The flow-blocking elastic body is provided with an elastic hole, and the entrance of the recoil channel is connected to the outside through the elastic hole.
[0009] The switch element is constructed as a silicone sheet with a cross opening.
[0010] Wherein, the fluid channel is configured with a stepped surface; The sensor comprises a connection block, which is connected in the fluid channel and sequentially holds the switch element and the flow-blocking element on the step surface.
[0011] Wherein, a first buffer cavity is formed on a side of the connecting block facing the switch element.
[0012] Wherein, a second buffer cavity is formed on a side of the flow blocking element facing the stepped surface.
[0013] The invention provides a sensor.
[0014] Wherein, the sensor comprises: case; A detection element is installed in the housing; The fluid introduction structure, the fluid channel of the fluid introduction structure is constructed in the housing, and the fluid channel is used to introduce the fluid to be measured into the detection element.
[0015] Wherein, a third buffer cavity is formed between the detection element and the fluid channel.
[0016] Compared with the prior art, the fluid introduction structure and the flow-blocking element and the switch element of the sensor of the present invention only achieve the reduction of the pressure pulse, which on the one hand avoids the damage of the sensitive element caused by the instantaneous large pressure pulse, and on the other hand ensures that the sensitive element can detect the conventional pressure pulse. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic diagram of the structure of the sensor of this embodiment is shown.
[0018] Figure 2 A partial schematic diagram of the sensor of this embodiment is shown.
[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 10. Shell; 11. Upper shell; 12. Lower shell; 101. Fluid channel; 102. Mounting cavity; 103. Interface channel; 20. Detection element; 21. Sealing block; 22. Circuit board; 23. Sensitive element; 30. flow-blocking element; 31. flow-blocking block; 321. main channel; 322. recoil channel; 40. Switching element; 51. first positioning element; 52. separation ring; 53. second positioning element; 54. connection block; 60. Interface terminal; 71. First buffer cavity; 72. Second buffer cavity; 73. Third buffer cavity. DETAILED DESCRIPTION
[0020] 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.
[0021] 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.
[0022] 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.
[0023] 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.
[0024] 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.
[0025] The embodiment of the present invention discloses a sensor, wherein the sensor is used to reduce pressure pulses in a fluid pipeline, wherein the occurrence of the pressure pulses is affected by one or more factors, such as water hammer effect.
[0026] Figure 1 A schematic diagram of the structure of the sensor of this embodiment is shown. Figure 2 A partial schematic diagram of the sensor of this embodiment is shown.
[0027] Figure 1 The sensor is shown to include a housing 10 , a detection element 20 , a blocking element 30 and a switch element 40 .
[0028] The housing 10 has an installation cavity 102 formed inside and a first opening formed at the bottom. The first opening of the housing 10 is connected to the installation cavity 102 and a 101 is formed.
[0029] The detection element 20 is connected in the installation cavity 102 and forms a seal with respect to the fluid 101 at one end of the installation cavity 102. The detection element 20 can obtain one or more dimensional data of the fluid in the fluid 101 on the side facing the fluid 101.
[0030] For example, the detection element 20 can obtain the temperature, pressure and changes of the fluid in 101.
[0031] Figure 1 The detection element 20 is shown to include a sealing block 21 , a circuit board 22 and a sensitive element 23 .
[0032] The sealing block 21 is pressed and sealed between 101 and the mounting cavity 102. The sealing block 21 is configured with detection holes running through both sides. The circuit board 22 is fixedly connected to one side of the mounting cavity 102 of the sealing block 21. The sensitive element 23 is mounted on the circuit board 22 and is sealed to form a match with the detection hole. The sensitive element 23 obtains one or more dimensional data of the fluid passing through 101 through the detection hole.
[0033] Preferably, the sensitive element 23 is a pressure strain gauge. The pressure strain gauge is attached to the cover detection hole, and the periphery of the pressure strain gauge is sealed and covered by glue injection, so that the fluid in the sealing hole can transmit pressure to the pressure strain gauge, and cannot leak from the gap between the pressure strain gauge and the sealing hole into the installation cavity 102.
[0034] Preferably, Figure 1 The housing 10 is shown to include an upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are fixedly connected by riveting. During riveting, the sealing block 21 is pressed between the upper shell 11 and the lower shell 12. A sealing ring can be used to enhance the sealing effect between the sealing block 21 and the lower shell 12 and / or the upper shell 11. A mounting cavity 102 is formed between the upper shell 11 and the sealing block 21, and a cavity 101 is formed between the lower shell 12 and the sealing block 21.
[0035] Preferably, Figure 1 The sensor is shown to include 60. A second opening is configured at the top of the housing 10. The second opening of the housing 10 is connected to the mounting cavity 102 and an interface channel 103 is formed. 60 is connected to the detection element 20. 60 and the interface channel 103 are combined to form an insertion interface or insertion joint connected to an external device.
[0036] In some embodiments, the sensor includes an antenna. One end of the antenna is electrically connected to the circuit board 22, and one end of the antenna is encapsulated in the housing 10, or extends outside the housing 10. When the circuit board 22 is configured with a wireless module, the circuit board 22 transmits data to the outside through the antenna, or receives instructions from the outside, such as read instructions.
[0037] The flow-blocking element 30 is fixedly connected in 101 and is constructed with one or more flow-blocking structures. When a pressure pulse occurs, an instantaneous pressure difference is formed on both sides of the flow-blocking structure, and the flow-blocking structure slows down the transmission of the instantaneous pressure difference on both sides thereof.
[0038] Figure 2The flow blocking structure is shown to include a flow blocking block 31. The flow blocking block 31 is configured with a main channel 321 and a recoil channel 322. The flow blocking block 31 blocks 101, and the main channel 321 passes through the flow blocking block 31, with the inlet facing the first opening of the housing 10 and the outlet facing the detection element 20. The inlet of the recoil channel 322 faces the first opening of the housing 10, and the outlet is connected to the middle section of the main channel 321 inside the flow blocking block 31. It is necessary that the direction of the outlet of the recoil channel 322 is at least partially opposite to the flow path of the main channel 321. At the connection point between the main channel 321 and the recoil channel 322, the outflow direction of the outlet of the recoil channel 322 is set at an obtuse angle to the flow direction of the fluid inside the main channel 321. The flow direction of the main channel 321 refers to the path from the inlet to the outlet of the main channel 321. When a pressure pulse occurs, the fluid enters the main channel 321 and the recoil channel 322 respectively. After being guided by the recoil channel 322, the fluid enters the main channel 321. The original fluid in the main channel 321 and the fluid entering the recoil channel 322 have opposite flow directions, thereby causing a blocking effect, slowing down the transmission of the instantaneous pressure difference on both sides of the main channel 321.
[0039] The switch element 40 is configured as a flow-blocking elastic body. There may be a plurality of switch elements 40, each corresponding to an inlet of a recoil channel 322 of a flow-blocking block 31. The switch element 40 is fixedly connected to the inlet of the recoil channel 322 and is kept closed or at a relatively small opening (a relatively small through cross section). Specifically, the flow-blocking elastic body is configured with elastic holes, which are aligned with the inlet of the recoil channel 322. The elastic holes are located on both sides of the flow-blocking elastic body ( Figure 1 , Figure 2 An elastic channel through which fluid can pass is formed (on the upper and lower sides). When a significant pressure pulse occurs, a large instantaneous pressure difference is formed on both sides of the flow-blocking elastomer, and the diameter of the elastic hole will be affected by the instantaneous pressure difference and opened or expanded by the impact (expanded by the impact), thereby allowing more fluid to pass through, causing a significant blocking effect on the fluid in the main channel 321 and the recoil channel 322 of the flow-blocking structure. When a smaller pressure pulse occurs, a smaller instantaneous pressure difference is formed on both sides of the flow-blocking elastomer, and the diameter of the elastic hole will be affected by the instantaneous pressure difference and increased to a limited extent, thereby allowing a limited amount of fluid to pass through, causing no blocking effect or an insignificant blocking effect on the fluid in the main channel 321 and the recoil channel 322 of the flow-blocking structure. Then the switch element 40 can be used in conjunction with the flow-blocking element 30, avoiding the interference of the flow-blocking element 30 on the normal fluid fluctuation, and ensuring that the detection element 20 can detect the normal fluid fluctuation.
[0040] In some embodiments, the flow-blocking elastic body is made of one or more materials such as foam, rubber or elastic plastic.
[0041] Preferably, the switch element 40 is constructed as a silicone sheet with a cross opening. The silicone sheet with a cross opening can completely close the inlet of the recoil channel 322 when the pressure pulse is small, or only maintain a small opening. When a pressure pulse occurs, the cross opening of the silicone sheet opens to the low-pressure side, thereby allowing the fluid on the high-pressure side to enter the low-pressure side; when the pressure pulse ends, the cross opening of the silicone sheet closes, preventing the fluid on both sides of the silicone sheet from communicating.
[0042] In some embodiments, the baffle block 31 may be configured with a plurality of recoil channels 322 , and each recoil channel 322 is connected to the main channel 321 .
[0043] in, Figure 2 It is shown that 101 is configured with a stepped surface on the side facing the measuring element. The sensor includes a first positioning element 51, a separation ring 52, a second positioning element 53 and a connecting block 54 connected in 101. The first positioning element 51 and the second positioning element 53 are both block-shaped members configured with a central opening, and the outer peripheral shape of the block-shaped member is adapted to the inner wall shape of the fluid channel, and the central opening allows the fluid to pass through both sides of the block-shaped member. Optionally, when the thickness of the block-shaped member is very thin, the block-shaped member can be regarded as a plate-shaped member. The upper end of the first positioning element 51 abuts against the stepped surface, and the lower end is connected to the upper end of the flow-blocking element 30 through the separation ring 52. The upper end of the second positioning element 53 presses the switch element 40 at the lower end of the flow-blocking element 30. The connecting block 54 is fixedly connected to the first opening, and presses the second positioning element 53 at the lower ends of the switch element 40 and the flow-blocking element 30. The connecting block 54 is configured with a central opening, and the upper end of the connecting block 54 is configured to have an inverted U-shaped cross section. The outer periphery of the connecting block 54 is threadedly connected to the inner wall of the first opening at 101. When the connecting block 54 and the threaded connection 101 are matched, the second positioning element 53, the switch element 40, the flow blocking element 30, the separation ring 52 and the upper baffle are pressed in sequence to the stepped surface. Then a first buffer cavity 71 is formed between the connecting block 54 and the second positioning element 53, and a second buffer cavity 72 is formed between the flow blocking element 30, the separation ring 52 and the first positioning element 51. When a pressure pulse occurs, when the fluid enters the first buffer cavity 71 and the second buffer cavity 72, the first buffer cavity 71 and the second buffer cavity 72 respectively buffer and weaken the pressure pulse.
[0044] Preferably, the connection block 54 is penetrated with a plurality of flow holes, and the hole direction of the flow holes is perpendicular or inclined to the length direction of 101 .
[0045] The housing 10 forms a third buffer cavity 73 between the detection element 20 and the first positioning element 51. When a pressure pulse occurs, when the fluid passing through the first positioning element 51 enters the third buffer cavity 73, the third buffer cavity 73 provides buffering to weaken the pressure pulse.
[0046] Therefore, the flow-blocking element 30 of the sensor edge 101 of the present embodiment realizes the buffering effect only on the obvious pressure pulse, and further improves the buffering effect on the pressure pulse through the first buffer cavity 71 , the second buffer cavity 72 , and the third buffer cavity 73 .
[0047] Furthermore, the present invention provides a fluid introduction structure, which can be used as a fluid introduction part of any sensor.
[0048] Among them, the fluid introduction structure is constructed with 101, and a flow-blocking element 30 and a switch element 40 are disposed in 101. The flow-blocking element 30 includes one or more flow-blocking structures. The flow-blocking structure is blocked in 101. Each flow-blocking structure is constructed with a main channel 321 and a recoil channel 322. The main channel 321 connects the two sides of the flow-blocking structure. The inlet of the recoil channel 322 faces the outside, and the outlet is connected to the main channel 321. The outlet of the recoil channel 322 faces at least partially opposite to the flow direction of the main channel 321. The switch element 40 keeps the inlet of the recoil channel 322 closed, and the switch element 40 releases the closure according to the pressure pulse.
[0049] In the above embodiment, the baffle block 31 may include at least two baffle block units assembled in the width direction of the fluid channel, and the main channel 321 and the recoil channel 322 may be surrounded by the two baffle block units.
[0050] 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, characterized in that: include: a fluid channel for introducing a fluid to be measured; The flow-blocking element disposed in the fluid channel includes at least one flow-blocking structure; The flow-blocking structure includes a main channel and a recoil channel; The inlet and outlet of the main channel are respectively arranged on both sides of the baffle block; The inlet of the recoil channel is arranged on the same side as the inlet of the main channel, and the outlet is connected to the main channel; At the connection point between the main channel and the recoil channel, the outflow direction of the recoil channel forms an obtuse angle with the flow direction of the fluid in the main channel; At least one switch element disposed in the fluid channel and located outside the baffle block comprises a hole which is opened or expanded by the fluid when the pressure at the inlet of the recoil channel is too high.
2. The fluid introduction structure according to claim 1, characterized in that: The flow-blocking element comprises at least two of the flow-blocking structures; At least two of the flow-blocking structures are combined to block the fluid channel.
3. The fluid introduction structure according to claim 1, characterized in that: The flow-blocking structure comprises at least two recoil channels; The outlets of at least two of the recoil channels are connected to the same main channel.
4. The fluid introduction structure according to claim 1, characterized in that: The switch element includes a flow-blocking elastic body; The flow-blocking elastic body is provided with an elastic hole, and the entrance of the recoil channel is connected to the outside through the elastic hole.
5. The fluid introduction structure according to claim 1, characterized in that: The switch element is configured as a silicone sheet having a cross opening.
6. The fluid introduction structure according to claim 1, characterized in that: The fluid channel is configured with a stepped surface; The sensor comprises a connection block, which is connected in the fluid channel and sequentially holds the switch element and the flow-blocking element on the step surface.
7. The fluid introduction structure according to claim 6, characterized in that: A first buffer cavity is formed on a side of the connection block facing the switch element.
8. The fluid introduction structure according to claim 6, characterized in that: A second buffer cavity is formed on a side of the flow blocking element facing the stepped surface.
9. A sensor, characterized in that: include: case; A detection element is installed in the housing; The fluid introduction structure according to any one of claims 1 to 8; The fluid channel is constructed in the housing, and is used to introduce the fluid to be measured into the detection element.
10. The sensor according to claim 9, characterized in that A third buffer cavity is formed between the detection element and the fluid channel.