Pressure sensor with buffering function

Abstract

The invention relates to the field of pressure sensors, in particular to a pressure sensor with a buffering function, which comprises a mounting seat, a pressure core body and a buffering assembly, the mounting seat is provided with a flow guide cavity and a mounting cavity, and the flow guide cavity and the mounting cavity are coaxially arranged on the mounting seat; the buffer assembly is limited in a mounting cavity between the mounting seat and the pressure core body; the buffer assembly is provided with a channel, the flow area of the channel has the maximum area and the minimum area, and the buffer assembly receiving the medium pressure is used for controlling the flow area of the channel to be switched between the maximum area and the minimum area. When the pressure change of the medium pressure in the flow guide cavity is violently changed, the flow area of the channel is changed from the maximum area to the minimum area, the effect of protecting the pressure core body is achieved, and when the pressure change of the medium pressure in the flow guide cavity is gently changed, the flow area of the channel is kept to be the maximum area. And the pressure change speed of the pressure of the medium between the pressure core body and the buffer assembly is higher.

Description

Technical Field

[0001] This invention relates to the field of pressure sensors, specifically pressure sensors with buffering functions. Background Technology

[0002] In the prior art, there is a patent document entitled "A Sensitive Component and Pressure Sensor", with application number 202121583080.X. In this prior art, the sensitive component is provided with a buffer structure in the medium channel. Specifically, a buffer hole is provided on the first buffer plate, or a notch is provided on the second buffer plate, so as to reduce the cross-sectional area of ​​the medium channel and thereby reduce the pressure of the medium flowing through the buffer structure, so as to protect the pressure sensitive element.

[0003] The drawback of the existing technology is that when the external medium pressure of the sensitive component increases, although the internal medium pressure of the sensitive component also shows an increasing trend through the buffer structure, the rate of increase of the internal medium pressure of the sensitive component is relatively slow. This results in a long detection time and a slow detection speed of the medium pressure change by the pressure sensing element of the sensitive component.

[0004] Therefore, how to improve the detection speed of changes in the pressure of the detection medium while protecting the pressure-sensitive element has become a technical problem to be solved. Summary of the Invention

[0005] To address the technical problem of improving the detection speed of changes in medium pressure while protecting pressure-sensitive elements, this invention provides a pressure sensor with a buffer function.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] According to one aspect of the present invention, a pressure sensor with a buffer function is provided, comprising a mounting base, a pressure core, and a buffer assembly;

[0008] The mounting base is provided with a flow guiding cavity and a mounting cavity, the flow guiding cavity and the mounting cavity are coaxially disposed on the mounting base, and the flow guiding cavity forms an opening with one of the surfaces of the mounting base;

[0009] The buffer assembly and the pressure core are respectively disposed in the mounting cavity, and the buffer assembly is confined within the mounting cavity located between the mounting base and the pressure core;

[0010] The buffer assembly is provided with a channel along the axial direction of the mounting cavity. The flow area of ​​the channel has a maximum area and a minimum area. The buffer assembly, upon receiving medium pressure, is used to control the flow area of ​​the channel to switch between the maximum area and the minimum area.

[0011] Furthermore, the buffer assembly includes a buffer sheet and a baffle;

[0012] The buffer sheet is provided with a first through hole and a second through hole, wherein the diameter of the first through hole is smaller than the diameter of the second through hole;

[0013] The baffle is provided with a third through hole and a fourth through hole, wherein the diameter of the third through hole is smaller than the diameter of the fourth through hole;

[0014] The first through hole, the second through hole, the third through hole, and the fourth through hole are each a part of the channel structure. The outlines of the first through hole and the second through hole do not interfere with each other, and the outlines of the third through hole and the fourth through hole do not interfere with each other. Along the axial direction of the mounting cavity, the first projection outline of the first through hole projected onto the baffle forms a concentric circle or coincides with the outline of the third through hole. The second projection outline of the second through hole projected onto the baffle forms a gap with the outline of the fourth through hole.

[0015] When the buffer sheet and the baffle are in contact with each other, the smaller of the opening areas of the first through hole and the third through hole is the minimum area of ​​the channel.

[0016] When the buffer sheet and the baffle are separated from each other, the minimum of the sum of the opening areas of the first through hole and the second through hole and the sum of the opening areas of the third through hole and the fourth through hole is the maximum area of ​​the channel.

[0017] Furthermore, the diameter of the first through hole is the same as the diameter of the third through hole;

[0018] The diameter of the second through hole is the same as the diameter of the fourth through hole.

[0019] Furthermore, the number of the first through hole and the number of the third through hole are both two;

[0020] The number of the second through hole and the number of the fourth through hole are both 2.

[0021] Furthermore, the two first through holes are respectively located on the first diameter of the buffer sheet, and the two first through holes are spaced apart by the center of the buffer sheet;

[0022] The two second through holes are respectively located on the second diameter of the buffer sheet, and the two second through holes are separated by the center of the buffer sheet;

[0023] The first diameter and the second diameter are perpendicular to each other;

[0024] The two third through holes and the two fourth through holes are respectively located on one of the diameters of the baffle, wherein the two fourth through holes are located between the two third through holes and are separated by the center of the baffle.

[0025] Furthermore, the buffer assembly also includes: a support column, a first support spring, and a second support spring;

[0026] The bottom surface of the mounting cavity is recessed and provided with mounting grooves, and the number of mounting grooves is 3 or 4.

[0027] The buffer sheet and the baffle are respectively provided with mounting through holes;

[0028] The number of mounting through holes, the number of the first support springs, the number of the second support springs, and the number of the pillars are all the same as the number of mounting slots;

[0029] Each of the support pillars is interference-fitted with one of the mounting grooves and one of the mounting through holes located on the baffle, and each of the support pillars is clearance-fitted with the mounting through hole located on the buffer plate.

[0030] One of the first support springs is sleeved on the support column located between the bottom surface of the cavity and the buffer sheet;

[0031] One of the second support springs is sleeved on the support column located between the buffer plate and the baffle plate.

[0032] Furthermore, the baffle includes a first layer and a second layer;

[0033] The diameter of the first sheet is smaller than the diameter of the second sheet, and the first sheet and the second sheet are coaxial and integrally formed.

[0034] The third through hole and the fourth through hole respectively penetrate the first sheet and the second sheet, and the mounting groove located on the baffle only penetrates the second sheet;

[0035] The space between the buffer sheet, the first layer, and the second layer is used to accommodate the second support spring.

[0036] Furthermore, the elastic force of the second support spring is greater than that of the first support spring.

[0037] Furthermore, the pressure core includes a diaphragm and a housing, the housing being manufactured in a circular sleeve shape, and the diaphragm being located at the axial open end of the housing;

[0038] The diaphragm is confined within the mounting cavity, and the gap between the housing and the mounting base is sealed by welding.

[0039] The above technical solution has the following advantages or beneficial effects:

[0040] The pressure sensor with buffering function provided by this invention changes the flow area of ​​the buffer component's channel by receiving the medium pressure. The minimum area of ​​the channel's flow area is equal to the opening area of ​​the buffer hole in the prior art, or equal to the opening area of ​​the notch. As a result, the maximum area of ​​the channel's flow area in this invention is much larger than the opening area of ​​the buffer hole in the prior art, or much larger than the opening area of ​​the notch. In this invention, when the pressure change of the medium in the flow guide cavity is drastic, the flow area of ​​the channel changes from the maximum area to the minimum area, achieving the effect of protecting the pressure core. When the pressure change of the medium in the flow guide cavity is gradual, the flow area of ​​the channel remains at the maximum area, making the pressure change of the medium between the pressure core and the buffer component faster and the pressure change time shorter, thereby improving the speed at which the pressure core detects pressure changes. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a pressure sensor with buffering function provided in an embodiment of the present invention;

[0042] Figure 2 A cross-sectional view of a pressure sensor with buffering function provided in an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the split structure of a pressure sensor with buffering function provided in an embodiment of the present invention;

[0044] Figure 4 A cross-sectional view of the mounting base provided in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of the buffer component provided in an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the structure of the buffer component provided in an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the structure of the buffer sheet provided in an embodiment of the present invention;

[0048] Figure 8 This is a schematic diagram of the structure of the baffle provided in an embodiment of the present invention;

[0049] Figure 9 This is a schematic diagram of the mounting base provided in an embodiment of the present invention.

[0050] Figure label:

[0051] 1. Mounting base; 2. Pressure core; 3. Buffer assembly; 4. Sealing structure;

[0052] 11. Flow guide cavity; 12. Mounting cavity; 31. Buffer plate; 32. Baffle plate; 33. Support column; 34. First support spring; 35. Second support spring;

[0053] 100. Mounting through hole; 120. Cavity bottom surface; 121. Mounting groove; 311. First through hole; 312. Second through hole; 321. Third through hole; 322. Fourth through hole; 327. First layer; 328. Second layer. Detailed Implementation

[0054] To address the technical problem of improving the detection speed of pressure changes while protecting pressure-sensitive elements, this invention provides a pressure sensor with a buffer function.

[0055] In this paper, the inventors adopted the method of changing the flow area of ​​the channel. On the one hand, when the flow area of ​​the channel is set to the maximum area, it is used to improve the detection speed of pressure changes. On the other hand, when the flow area is set to the minimum area, it is used to protect the pressure sensitive element (i.e., the pressure core in this paper).

[0056] The following detailed description uses specific examples.

[0057] Example 1:

[0058] See Figure 1 or Figure 2 or Figure 4 This embodiment provides a pressure sensor with a buffer function, including a mounting base 1, a pressure core 2, and a buffer assembly 3;

[0059] Mounting base 1 is provided with a flow guiding cavity 11 and a mounting cavity 12. The flow guiding cavity 11 and the mounting cavity 12 are coaxially arranged on the mounting base 1, and the flow guiding cavity 11 forms an opening with one of the surfaces of the mounting base 1.

[0060] The buffer assembly 3 and the pressure core 2 are respectively disposed in the mounting cavity 12, and the buffer assembly 3 is confined within the mounting cavity 12 located between the mounting base 1 and the pressure core 2;

[0061] The buffer assembly 3 is provided with a channel along the axial direction of the mounting cavity 12. The flow area of ​​the channel has a maximum area and a minimum area. The buffer assembly 3, which receives the medium pressure, is used to control the flow area of ​​the channel to switch between the maximum area and the minimum area.

[0062] In this embodiment, see Figure 2 or Figure 4 From the perspective of the installation structure, the mounting base 1 is a container structure used to set the pressure core 2 and the buffer assembly 3; from the perspective of actually detecting the medium pressure, the flow guide cavity 11 and the mounting cavity 12 of the mounting base 1 are restrictive structures for medium flow and medium pressure changes.

[0063] In this embodiment, see Figure 2 or Figure 4 The pressure core 2 and the buffer assembly 3 are respectively disposed in the mounting cavity 12 of the mounting base 1; specifically, the buffer assembly 3 is completely located in the mounting cavity 12; most of the structure of the pressure core 2 (including the diaphragm of the pressure core 2) is disposed in the mounting cavity 12, and a small part of the structure of the pressure core 2 (such as the pins) is located outside the mounting cavity 12; from the perspective of actually detecting the medium pressure, the buffer assembly 3 is completely located in the mounting cavity 12, which can effectively limit the medium pressure acting on the pressure core 2.

[0064] In this embodiment, the channel of the buffer component 3 plays a specific role in limiting the medium pressure on the pressure core 2; the flow area of ​​the channel is designed to have a maximum area and a minimum area.

[0065] From the perspective of actual medium pressure detection, when the pressure sensor with buffer function in this embodiment is actually installed on the medium circuit, the medium circuit should be understood as a flow cavity for the flow of the medium (fluid medium); when the guide cavity 11 is connected to the medium circuit, and the guide cavity 11 and the mounting cavity 12 of the mounting base 1 respectively store the medium, the medium pressure in the guide cavity 11 and the medium pressure in the mounting cavity 12 exhibit the following three situations:

[0066] In the first scenario, the medium pressure in the flow guide cavity 11 and the medium pressure in the mounting cavity 12 are the same. For example, when the medium in the medium circuit is not pressurized by an external force (e.g., not pressurized by a booster pump), the medium pressure in the medium circuit, the medium pressure in the flow guide cavity 11, and the medium pressure in the mounting cavity 12 are the same. Alternatively, when the medium in the medium circuit is pressurized by an external force, and after a short period of time, the medium pressure in the medium circuit, the medium pressure in the flow guide cavity 11, and the medium pressure in the mounting cavity 12 are increased sequentially until they reach the same level.

[0067] In the second scenario, the medium pressure in the flow guide cavity 11 is greater than the medium pressure in the mounting cavity 12. For example, when the medium in the medium circuit is pressurized by an external force (e.g., by a booster pump), the medium pressure in the medium circuit increases. However, along the direction of the medium circuit, the flow guide cavity 11, and the mounting cavity 12, it takes a small amount of time for the medium pressure in the flow guide cavity 11 to increase to the medium pressure in the medium circuit. Correspondingly, it takes a small amount of time for the medium pressure in the mounting cavity 12 to increase to the medium pressure in the medium circuit. This results in the medium pressure in the flow guide cavity 11 increasing first, and then the medium pressure in the mounting cavity 12 increasing again, thus creating a time difference in the pressure increase between the medium pressure in the flow guide cavity 11 and the medium pressure in the mounting cavity 12. Therefore, during the time of pressure increase, the medium pressure in the flow guide cavity 11 is greater than the medium pressure in the mounting cavity 12.

[0068] In the third scenario, the medium pressure in the flow guide cavity 11 is less than the medium pressure in the mounting cavity 12. For example, when the medium in the medium circuit loses external pressure boosting (e.g., the booster pump loses its boosting), the medium pressure in the medium circuit decreases. However, along the direction of the mounting cavity 12, the flow guide cavity 11, and the medium circuit, it takes a short time for the medium pressure in the flow guide cavity 11 to decrease to the medium pressure in the medium circuit. Correspondingly, it takes a short time for the medium pressure in the mounting cavity 12 to decrease to the medium pressure in the medium circuit. This results in the medium pressure in the flow guide cavity 11 decreasing first, and then the medium pressure in the mounting cavity 12 decreasing again, thus creating a time difference in the pressure reduction between the medium pressure in the mounting cavity 12 and the medium pressure in the flow guide cavity 11. Therefore, within the time of pressure reduction, the medium pressure in the flow guide cavity 11 is less than the medium pressure in the mounting cavity 12.

[0069] For buffer component 3, in the first case described above, the flow area of ​​the channel of buffer component 3 is at its maximum.

[0070] For buffer component 3, during the transition from the first situation to the second situation described above, two states with different pressurization rates are formed:

[0071] In the first state, during the period between the increase of the medium pressure in the flow guide cavity 11 and the increase of the medium pressure in the mounting cavity 12, if the medium pressure in the flow guide cavity 11 increases drastically (i.e., the medium pressure in the flow guide cavity 11 increases to the medium pressure of the medium circuit in a relatively short time), then the flow area of ​​the buffer component 3 changes from its maximum area to its minimum area. This reduces the rate of increase of the medium pressure in the mounting cavity 12 between the pressure core 2 and the buffer component 3, prolongs the time for the medium pressure to increase, and increases the time for the pressure core 2 to detect pressure changes, thus protecting the pressure core 2. At this time, the medium pressure in the mounting cavity 12 can still increase relatively slowly through the current minimum area of ​​the buffer component 3, until the medium pressure in the mounting cavity 12 between the buffer component 3 and the pressure core 2 increases to the medium pressure in the flow guide cavity 11. Then, the medium pressure in the flow guide cavity 11 and the medium pressure in the mounting cavity 12 return to the first state, and the buffer component 3 has completed the buffering work on the rate of increase of the medium pressure.

[0072] In the second state, during the period between the increase of the medium pressure in the flow guide cavity 11 and the increase of the medium pressure in the mounting cavity 12, if the medium pressure in the flow guide cavity 11 increases slowly, that is, the medium pressure in the flow guide cavity 11 increases to the medium pressure of the medium circuit in a relatively long time, then the flow area of ​​the channel of the buffer assembly 3 remains at its maximum area. Its function is to increase the rate of increase of the medium pressure in the mounting cavity 12 between the pressure core 2 and the buffer assembly 3, reduce the time of increase of the medium pressure, and reduce the time for the pressure core 2 to detect the pressure change of the medium pressure, thereby improving the detection speed of the pressure change.

[0073] For the buffer assembly 3, during the transition from the first situation to the third situation, the flow area of ​​the channel of the buffer assembly 3 is always kept at the maximum area. As a result, the medium pressure in the mounting cavity 12 between the buffer assembly 3 and the pressure core 2 can be reduced quickly, reducing the detection time of the pressure core 2 in detecting the medium pressure and increasing the detection speed of the pressure core 2 in detecting the medium pressure.

[0074] It should be understood that detecting the pressure of the medium through a pressure sensor, especially detecting the rate of change of the medium pressure, takes time. This is reflected in the fact that the pressure change of the medium used to apply pressure to the pressure core 2 takes time. When the medium pressure in the medium circuit increases, the corresponding medium pressure in the guide cavity 11 will not increase simultaneously. The medium pressure in the guide cavity 11 will only increase when the medium pressure in the medium circuit is transmitted to the guide cavity 11. Therefore, it takes a certain amount of time for the medium pressure to be transmitted to the guide cavity 11. Similarly, when the medium pressure in the guide cavity 11 increases, the corresponding medium pressure in the mounting cavity 12 will not increase simultaneously. The medium pressure in the mounting cavity 12 will only increase when the medium pressure in the guide cavity 11 is transmitted to the mounting cavity 12. Therefore, it takes a certain amount of time for the medium pressure to be transmitted to the mounting cavity 12.

[0075] It should be understood that the time required for a change in medium pressure is calculated in milliseconds, so the overall time for a change in medium pressure is perceived as very short.

[0076] In this embodiment, the first main function of the buffer component 3 is to change the flow area of ​​the channel of the buffer component 3 from the maximum area to the minimum area when the medium pressure in the guide cavity 11 increases dramatically. This increases the time for the medium pressure to be transmitted from the guide cavity 11 to the mounting cavity 12, thereby reducing the speed at which the medium pressure in the guide cavity 11 is transmitted to the mounting cavity 12. In other words, it reduces the rate at which the pressure of the medium in the mounting cavity 12 located between the buffer component 3 and the pressure core 2 increases, thereby protecting the pressure core 2.

[0077] The prerequisite for achieving the first major function is that the medium pressure in the flow guide cavity 11 increases dramatically. Under this condition, assuming that the flow area of ​​the buffer component 3 channel remains at its maximum, the rate of increase of the medium pressure in the mounting cavity 12 is consistent with the rate of increase of the medium pressure in the flow guide cavity 11. Consequently, the pressure change of the medium pressure in the mounting cavity 12 is dramatic, resulting in a negative impact of the medium on the pressure core 2. This negative effect will cause the diaphragm of the pressure core 2 to rupture, and even damage the connection structure between the pressure core 2 and the mounting base 1 (see the welding structure below).

[0078] In this embodiment, the second main function of the buffer component 3 is to increase the speed at which the medium pressure in the guide cavity 11 is transmitted from the guide cavity 11 to the mounting cavity 12 under the condition that the medium pressure in the guide cavity 11 increases gradually. In other words, it increases the speed at which the pressure of the medium in the mounting cavity 12 located between the buffer component 3 and the pressure core 2 increases, thereby increasing the speed at which the pressure core 2 detects the medium pressure.

[0079] The prerequisite for achieving the second main function is that the medium pressure in the flow guide cavity 11 increases gradually. Under this condition, assuming that the flow area of ​​the buffer component 3 channel is adjusted from the maximum area to the minimum area, the pressure increase rate of the medium in the mounting cavity 12 is particularly slow, and the pressure change time of the medium in the mounting cavity 12 is longer. This results in a negative effect where the pressure core 2 takes a long time to detect the medium pressure and the detection rate of the medium pressure change is slow. This negative effect will cause a significant delay effect for the system controlled by the pressure sensor.

[0080] In the prior art (a sensitive component and pressure sensor, application number 202121583080.X), the sensitive component only has a first buffer plate with a buffer hole in the medium channel, or a second buffer plate with a notch. This prior art only achieves the purpose of protecting the pressure sensitive element and preventing it from being damaged. However, at least during the process of the medium pressure in the medium channel increasing gradually, the pressure sensitive element takes a long time to detect the pressure change of the medium pressure, and the detection speed is slow.

[0081] The pressure sensor with buffering function in this embodiment changes the flow area of ​​the channel of the buffer component 3 by receiving the medium pressure. The minimum area of ​​the flow area of ​​the channel is equal to the opening area of ​​the buffer hole in the prior art, or equal to the opening area of ​​the notch. As a result, the maximum area of ​​the flow area of ​​the channel in this embodiment is much larger than the opening area of ​​the buffer hole in the prior art, or much larger than the opening area of ​​the notch. In this embodiment, when the pressure change of the medium pressure in the flow guide cavity 11 is drastic, the flow area of ​​the channel changes from the maximum area to the minimum area, thereby protecting the pressure core 2. When the pressure change of the medium pressure in the flow guide cavity 11 is gradual, the flow area of ​​the channel remains at the maximum area, so that the pressure change of the medium pressure between the pressure core 2 and the buffer component 3 is faster and the pressure change time is shorter, thereby improving the detection speed of pressure change by the pressure core 2.

[0082] Therefore, the pressure sensor with buffer function provided in this embodiment solves the technical problem of how to improve the detection speed of changes in the pressure of the detection medium while protecting the pressure-sensitive element.

[0083] Further, see Figure 3 , Figures 5 to 8 The pressure sensor with buffering function in this embodiment includes a buffer plate 31 and a baffle plate 32.

[0084] The buffer sheet 31 is provided with a first through hole 311 and a second through hole 312, wherein the diameter of the first through hole 311 is smaller than the diameter of the second through hole 312;

[0085] The baffle 32 is provided with a third through hole 321 and a fourth through hole 322, the diameter of the third through hole 321 being smaller than the diameter of the fourth through hole 322;

[0086] The first through hole 311, the second through hole 312, the third through hole 321, and the fourth through hole 322 are each part of the channel structure. The outline of the first through hole 311 does not interfere with the outline of the second through hole 312, and the outline of the third through hole 321 does not interfere with the outline of the fourth through hole 322. Along the axial direction of the mounting cavity 12, the first projection outline of the first through hole 311 projected onto the baffle 32 forms a concentric circle or coincides with the outline of the third through hole 321. The second projection outline of the second through hole 312 projected onto the baffle 32 forms a gap with the outline of the fourth through hole 322.

[0087] When the buffer plate 31 and the baffle plate 32 are in contact with each other, the smallest opening area among "the opening area of ​​the first through hole 311 and the opening area of ​​the third through hole 321" is the minimum area of ​​the channel.

[0088] When the buffer plate 31 and the baffle plate 32 are separated, the smallest of the two, namely the sum of the opening area of ​​the first through hole 311 and the opening area of ​​the second through hole 312 and the sum of the opening area of ​​the third through hole 321 and the opening area of ​​the fourth through hole 322, is the maximum area of ​​the channel.

[0089] In this embodiment, see Figure 3 or Figure 5 The center line of the first through hole 311 on the buffer plate 31 is collinear with the center line of the third through hole 321 on the baffle plate 32, so that the first projection outline of the first through hole 311 onto the baffle plate 32 coincides with the third through hole 321 of the baffle plate 32, or becomes a concentric circle; in other words, when the buffer plate 31 and the baffle plate 32 are actually set in the mounting cavity 12, along the circumferential direction of the mounting cavity 12, the position of the first through hole 311 on the buffer plate 31 and the position of the third through hole 321 on the baffle plate 32 are equivalent to the same position.

[0090] In this embodiment, see Figure 3 , Figure 7 or Figure 8 The center line of the second through hole 312 located on the buffer plate 31 is spaced from the center line of the fourth through hole 322 located on the baffle plate 32. Any point of the outline of the second through hole 312 is projected onto the baffle plate 32. The projection of this point is located outside the outline of the fourth through hole 322 of the baffle plate 32, thereby forming a second projection outline of the second through hole 312 onto the baffle plate 32, which is spaced from the outline of the fourth through hole 322. In other words, when the buffer plate 31 and the baffle plate 32 are actually placed in the mounting cavity 12, the position of the second through hole 312 on the buffer plate 31 and the position of the fourth through hole 322 on the baffle plate 32 are not the same along the circumferential direction of the mounting cavity 12.

[0091] When the buffer plate 31 receives the medium pressure from the flow guide cavity 11, if the pressure change of the medium pressure received by the buffer plate 31 is a sharp increase, then the buffer plate 31 is pushed by the medium pressure and moves towards the baffle plate 32 until the buffer plate 31 and the baffle plate 32 are in contact with each other; if the pressure change of the medium pressure received by the buffer plate 31 is a gradual increase, then the buffer plate 31 and the baffle plate 32 separate from each other.

[0092] When the buffer sheet 31 and the baffle 32 are in contact with each other, the surface of the baffle 32 facing the buffer sheet 31 covers the second through hole 312 on the buffer sheet 31, and correspondingly, the surface of the buffer sheet 31 facing the baffle 32 covers the fourth through hole 322 on the baffle 32. At this time, since the second through hole 312 and the fourth through hole 322 are covered respectively, the flow area of ​​the channel is adjusted to the minimum area. At the same time, if the opening area of ​​the first through hole 311 of the buffer sheet 31 is greater than the opening area of ​​the third through hole 321, then the third through hole 321 becomes the minimum area of ​​the flow area of ​​the channel; conversely, if the opening area of ​​the first through hole 311 of the buffer sheet 31 is less than the opening area of ​​the third through hole 321, then the first through hole 311 becomes the minimum area of ​​the flow area of ​​the channel.

[0093] When the buffer plate 31 and the baffle plate 32 are separated from each other, the first through hole 311 and the second through hole 312 of the buffer plate 31, and the third through hole 321 and the fourth through hole 322 of the baffle plate 32 are respectively connected to the mounting cavity 12 located between the buffer plate 31 and the baffle plate 32; at this time, the flow area of ​​the channel is at its maximum.

[0094] The maximum flow area of ​​the channel can be configured in the following two ways:

[0095] In the first method, along the direction from the guide cavity 11 to the mounting cavity 12, the sum of the opening areas of the first through hole 311 and the second through hole 312 is greater than the sum of the opening areas of the third through hole 321 and the fourth through hole 322. Therefore, the sum of the opening areas of the third through hole 321 and the fourth through hole 322 becomes the maximum area of ​​the flow area of ​​the channel.

[0096] In the second method, along the direction from the guide cavity 11 to the mounting cavity 12, the sum of the opening areas of the first through hole 311 and the second through hole 312 is less than the sum of the opening areas of the third through hole 321 and the fourth through hole 322. Therefore, the sum of the opening areas of the first through hole 311 and the second through hole 312 becomes the maximum area of ​​the flow area of ​​the channel.

[0097] In addition to the first and second methods described above, this embodiment also provides a preferred solution, specifically:

[0098] In this embodiment, the pressure sensor with a buffer function has the same diameter for the first through hole 311 and the third through hole 321.

[0099] The diameter of the second through hole 312 is the same as the diameter of the fourth through hole 322.

[0100] In the preferred embodiment described above, the opening area of ​​the first through hole 311 and the opening area of ​​the third through hole 321 are the same, and are respectively equivalent to the opening area of ​​the buffer hole or the opening area of ​​the notch in the prior art.

[0101] In the preferred embodiment described above, the opening area of ​​the second through hole 312 is the same as the opening area of ​​the fourth through hole 322. The sum of the opening areas of the first through hole 311 and the second through hole 312, and the sum of the opening areas of the third through hole 321 and the fourth through hole 322, are respectively greater than the opening area of ​​the buffer hole or the opening area of ​​the notch in the prior art.

[0102] In the preferred embodiment described above, the sum of the opening areas of the first through hole 311 and the second through hole 312 is equal to the sum of the opening areas of the third through hole 321 and the fourth through hole 322. Therefore, the maximum flow area of ​​the channel is limited to one of the two.

[0103] By adopting the above technical solution, on the one hand, the machining dimensions of the through holes in the buffer plate 31 and the baffle plate 32 are made simpler during the manufacturing process, reducing the likelihood of conflicts during the machining process and improving machining efficiency; on the other hand, the buffer plate 31 and the baffle plate 32 can be used as interchangeable parts. Specifically, the structure of the baffle plate 32 can serve as the buffer plate 31, and the structure of the buffer plate 31 can serve as the baffle plate 32. Furthermore, the positions of the buffer plate 31 and the baffle plate 32 should be interchangeable. This arrangement reduces the identification work required by workers during the assembly of the baffle plate 32 and the buffer plate 31, thus improving assembly efficiency.

[0104] Furthermore, based on the aforementioned preferred solutions, see [link to relevant documentation]. Figure 3 , Figure 7 or Figure 8 In this embodiment, the pressure sensor with buffer function has two first through holes 311 and two third through holes 321.

[0105] The number of second through holes 312 and the number of fourth through holes 322 are both 2.

[0106] In practical applications, in addition to setting the number of the first through hole 311, the second through hole 312, the third through hole 321 and the fourth through hole 322 to 2, it is also possible to set it to 3 or 4, as long as the area of ​​the baffle 32 and the buffer plate 31 can meet the conditions for setting through holes; the following explanation is based on the scheme with 2 through holes. For the scheme with 3 or 4 through holes, refer to the scheme with 2 through holes.

[0107] In practical applications, the medium (fluid medium) usually contains impurities, which may block a certain through hole; if the buffer plate 31 is provided with only one first through hole 311, and the first through hole 311 is blocked by impurities, then the medium pressure will not be able to be transmitted to the pressure core 2.

[0108] Therefore, in this embodiment, there are two first through holes 311 on the buffer plate 31. If one of the first through holes 311 is blocked, the medium pressure can still be transmitted to the pressure core 2 through the other first through hole 311. Similarly, the principle of setting two third through holes 321 on the baffle plate 32 is the same as the principle of setting two first through holes 311 on the buffer plate 31, and will not be repeated here.

[0109] In this embodiment, the number of third through holes 321 on the buffer sheet 31 is set to 2, and the number of fourth through holes 322 on the baffle 32 is set to 2. The principle is the same as that of setting the number of first through holes 311 on the buffer sheet 31 to 2, and will not be repeated here.

[0110] Furthermore, based on the aforementioned scheme where the number of through holes is limited to two, see... Figure 7 or Figure 8 In this embodiment, the pressure sensor with buffer function has two first through holes 311 located on the first diameter of the buffer sheet 31, and the two first through holes 311 are separated by the center of the buffer sheet 31.

[0111] The two second through holes 312 are located on the second diameter of the buffer sheet 31, and the two second through holes 312 are separated by the center of the buffer sheet 31.

[0112] The first diameter and the second diameter are perpendicular to each other;

[0113] Two third through holes 321 and two fourth through holes 322 are located on one of the diameters of the baffle 32, wherein the two fourth through holes 322 are located between the two third through holes 321 and are spaced apart by the center of the baffle 32.

[0114] With the above arrangement, the diameter of the two first through holes 311 on the buffer sheet 31 intersects with the diameter of the two second through holes 312. Correspondingly, the two third through holes 321 and the two fourth through holes 322 of the baffle 32 are located on the same diameter. This means that when the buffer sheet 31 and the baffle 32 are in contact with each other, the two second through holes 312 on the buffer sheet 31 are covered by the baffle 32, and correspondingly, the two fourth through holes 322 of the baffle 32 are covered by the buffer sheet 31, thus forming the minimum flow area of ​​the channel.

[0115] Furthermore, based on all the aforementioned solutions, see [link to relevant documentation]. Figure 3 , Figure 5 , Figure 6 or Figure 9 The pressure sensor with buffering function in this embodiment also includes a buffer assembly 3: a support column 33, a first support spring 34, and a second support spring 35.

[0116] The bottom surface 120 of the mounting cavity 12 is recessed and provided with mounting grooves 121, and the number of mounting grooves 121 is 3 or 4.

[0117] The buffer plate 31 and the baffle plate 32 are each provided with mounting through holes 100;

[0118] The number of mounting through holes 100, the number of first support springs 34, the number of second support springs 35, and the number of pillars 33 are the same as the number of mounting slots 121;

[0119] Each support 33 is interference-fitted with one of the mounting grooves 121 and one of the mounting through holes 100 located in the baffle 32, and each support 33 is clearance-fitted with the mounting through hole 100 located in the buffer plate 31.

[0120] One of the first support springs 34 is sleeved on the support column 33 located between the bottom surface 120 of the cavity and the buffer plate 31;

[0121] One of the second support springs 35 is sleeved on the support column 33 located between the buffer plate 31 and the baffle plate 32.

[0122] Among them, the support column 33 plays a positioning role relative to the bottom surface 120 of the cavity. Specifically, the center line of the support column 33 is parallel to the axis of the mounting cavity 12 and is spaced apart. One end of the support column 33 is inserted into the mounting groove 121, so that the support column 33 is connected to the mounting base 1 in an interference fit manner.

[0123] In addition, the support column 33 itself also serves to restrict the movement direction of the buffer plate 31. Specifically, the support column 33 and the mounting through hole 100 of the buffer plate 31 form a clearance fit. During the movement of the buffer plate 31, the movement path of the buffer plate 31 is restricted to moving along the extension direction of the support column 33.

[0124] The first support spring 34 serves to separate the buffer plate 31 from the bottom surface 120 of the mounting cavity 12, preventing the buffer plate 31 from sticking to the bottom surface 120. Also, during the process of the buffer plate 31 changing from a state of mutual contact to a state of mutual separation relative to the baffle plate 32, the buffer plate 31 makes a movement close to the bottom surface 120 of the cavity. At this time, the first support spring 34 plays a buffering role in absorbing the kinetic energy of the buffer plate 31.

[0125] Correspondingly, the second support spring 35 serves to separate the buffer plate 31 from the baffle plate 32, preventing the buffer plate 31 from sticking to the baffle plate 32. When the buffer plate 31 receives medium pressure along the direction from the guide cavity 11 to the mounting cavity 12, the distance between the buffer plate 31 and the baffle plate 32 decreases. At this time, the second support spring 35 absorbs the kinetic energy of the buffer plate 31 and stores energy. Then, when the buffer plate 31 loses the medium pressure along the direction from the guide cavity 11 to the mounting cavity 12, the energy-stored second support spring 35 releases energy, serving as a power source to push the buffer plate 31 towards the bottom surface 120 of the cavity.

[0126] In the aforementioned solution, to avoid the second support spring 35 interfering with the mutual contact of the buffer sheet 31 and the baffle sheet 32 ​​due to the position of the second support spring 35 relative to the buffer sheet 31 and the baffle sheet 32, this embodiment provides the following technical solution, specifically:

[0127] See Figure 6 or Figure 8 The pressure sensor with buffer function in this embodiment has a baffle 32 including a first layer 327 and a second layer 328.

[0128] The diameter of the first layer 327 is smaller than the diameter of the second layer 328, and the first layer 327 and the second layer 328 are coaxial and integrally formed.

[0129] The third through hole 321 and the fourth through hole 322 penetrate the first layer 327 and the second layer 328 respectively, while the mounting groove 121 located in the baffle 32 only penetrates the second layer 328.

[0130] The space between the buffer sheet 31, the first layer 327, and the second layer 328 is used to accommodate the second support spring 35.

[0131] In the actual setup, the first layer 327 is located between the buffer sheet 31 and the second layer 328, which makes the space around the first layer 327 in the circumferential direction a space to accommodate the second support spring 35; in other words, the second support spring 35 is located outside the outline of the first layer 327, so that the second support spring 35 cannot interfere with the space between the buffer sheet 31 and the first layer 327.

[0132] Correspondingly, the positions of the support column 33 and the first support spring 34 in the aforementioned scheme are located outside the outline of the first layer 327, which will not be elaborated here.

[0133] Furthermore, in this embodiment, the pressure sensor with a buffer function has a second support spring 35 with a greater elastic force than the first support spring 34.

[0134] The purpose of adopting the above scheme is to provide sufficient energy for the buffer sheet 31 to separate and adhere to the baffle sheet 32, thereby improving the response speed.

[0135] Specifically, before the buffer sheet 31 and the baffle 32 change from being separated to being attached to each other, the first support spring 34 is compressed and accumulates energy because the elastic force of the second support spring 35 is greater than that of the first support spring 34.

[0136] After the buffer plate 31 receives the medium pressure, the medium pressure and the elastic force of the first support spring 34 that stores energy together force the buffer plate 31 to overcome the elastic force of the second support spring 35, causing the buffer plate 31 to make a movement similar to that of the baffle plate 32, thus shortening the time for the buffer plate 31 and the baffle plate 32 to become mutually attached and improving the response speed.

[0137] During the process of the buffer plate 31 and the baffle plate 32 being in contact with each other, the second support spring 35 is compressed by the buffer plate 31 and the baffle plate 32 to accumulate energy, which includes the pressure from the medium and the elastic force from the first support spring 34.

[0138] During the transition from mutual contact to mutual separation between the buffer plate 31 and the baffle plate 32, the buffer plate 31 loses the medium pressure. At the same time, the second support spring 35 releases energy to overcome the elastic force of the first support spring 34, so that the buffer plate 31 is equivalent to being subjected to the reverse force of the medium pressure. This shortens the time for the buffer plate 31 and the baffle plate 32 to transition to mutual separation, thus improving the response speed.

[0139] Further, see Figure 1 or Figure 2 The pressure sensor with buffer function in this embodiment includes a pressure core 2 comprising a diaphragm and a housing. The housing is manufactured in a circular sleeve shape, and the diaphragm is located at the axial open end of the housing.

[0140] The diaphragm is confined within the mounting cavity 12, and the gap between the housing and the mounting base 1 is sealed by welding to form a sealing structure 4.

[0141] The diaphragm of the pressure core 2 faces the baffle 32 inside the mounting cavity 12, and a gap is formed between the diaphragm and the baffle 32 to facilitate the diaphragm receiving the medium pressure.

[0142] The structure of the diaphragm and housing of the pressure core 2 is common knowledge known to those skilled in the art, and will not be described in detail here.

[0143] The housing of the pressure core 2 and the mounting base 1 are welded to form a sealing structure 4, which is intended to prevent the medium (fluid medium) from leaking from the gap between the housing and the mounting base 1; at the same time, the pressure core 2 forms a connection structure with respect to the mounting base 1 through the above welding method.

[0144] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. Pressure sensor with a buffering function, characterized in that The mounting seat, the pressure core and the buffer assembly are provided; The mounting seat is provided with a flow guide cavity and a mounting cavity, the flow guide cavity and the mounting cavity are coaxially arranged in the mounting seat, and the flow guide cavity forms an opening with one surface of the mounting seat; The buffer assembly and the pressure core are arranged in the mounting cavity respectively, and the buffer assembly is limited in the mounting cavity between the mounting seat and the pressure core; The buffer assembly is provided with a channel, along the axial direction of the mounting cavity, the flow area of the channel has a maximum area and a minimum area, the buffer assembly receiving the medium pressure is used for controlling the flow area of the channel to switch between the maximum area and the minimum area.

2. The pressure sensor having a buffering function according to claim 1, wherein The buffer assembly includes a buffer sheet and a stop sheet; The buffer sheet is provided with a first through hole and a second through hole, the diameter of the first through hole is smaller than the diameter of the second through hole; The stop sheet is provided with a third through hole and a fourth through hole, the diameter of the third through hole is smaller than the diameter of the fourth through hole; The first through hole, the second through hole, the third through hole and the fourth through hole are respectively one part of the channel, wherein the profile of the first through hole and the profile of the second through hole do not interfere with each other, the profile of the third through hole and the profile of the fourth through hole do not interfere with each other, along the axial direction of the mounting cavity, the first projection profile of the first through hole projected on the stop sheet is concentric with the profile of the third through hole or coincides with the profile of the third through hole, and the second projection profile of the second through hole projected on the stop sheet is spaced apart from the profile of the fourth through hole; When the buffer sheet and the stop sheet are attached to each other, the minimum of the opening area of the first through hole and the opening area of the third through hole is the minimum area of the channel; When the buffer sheet and the stop sheet are separated from each other, the minimum of the sum of the opening area of the first through hole and the opening area of the second through hole and the sum of the opening area of the third through hole and the opening area of the fourth through hole is the maximum area of the channel.

3. The pressure sensor with a buffering function according to claim 2, characterized in that, The diameter of the first through hole and the diameter of the third through hole are the same; The diameter of the second through hole and the diameter of the fourth through hole are the same.

4. The pressure sensor having a buffering function according to claim 2, wherein The number of the first through hole and the number of the third through hole are both two; The number of the second through hole and the number of the fourth through hole are both two.

5. The pressure sensor with a buffering function according to claim 4, characterized in that, The two first through holes are located on the first diameter of the buffer sheet, and the two first through holes are spaced apart by the center of the buffer sheet; The two second through holes are located on the second diameter of the buffer sheet, and the two second through holes are spaced apart by the center of the buffer sheet; The first diameter and the second diameter are perpendicular to each other; The two third through holes and the two fourth through holes are located on one diameter of the stop sheet, wherein The two fourth through holes are located between the two third through holes, and the two fourth through holes are spaced apart by the center of the stop sheet.

6. The pressure sensor with a buffering function according to any one of claims 2 to 5, characterized in that, The buffer assembly further includes a support, a first support spring and a second support spring; The cavity bottom surface of the installation cavity is concave and provided with installation grooves, and the number of the installation grooves is 3 or 4; The buffer sheet and the stop sheet are respectively provided with installation through holes; The number of the installation through holes, the number of the first supporting springs, the number of the second supporting springs and the number of the struts are respectively same as the number of the installation grooves; Each of the struts is in interference fit with one of the installation grooves and one of the installation through holes located at the stop sheet, and each of the struts is in clearance fit with the installation through hole located at the buffer sheet; One of the first supporting springs is sleeved on the strut located between the cavity bottom surface and the buffer sheet; One of the second supporting springs is sleeved on the strut located between the buffer sheet and the stop sheet.

7. The pressure sensor with a buffering function according to claim 6, characterized in that, The stop sheet comprises a first sheet layer and a second sheet layer; The diameter of the first sheet layer is smaller than the diameter of the second sheet layer, and the first sheet layer and the second sheet layer are coaxial and integrally made; The third through hole and the fourth through hole respectively pass through the first sheet layer and the second sheet layer, and the installation groove located at the stop sheet only passes through the second sheet layer; The space between the buffer sheet, the first sheet layer and the second sheet layer is used for accommodating the second supporting spring.

8. The pressure sensor having a buffering function according to claim 6, wherein The elastic force of the second supporting spring is greater than the elastic force of the first supporting spring.

9. The pressure sensor having a buffering function according to claim 1, wherein, The pressure core comprises a diaphragm and a shell, the shell is manufactured as a circular sleeve, and the diaphragm is located at the axial opening end of the shell; The diaphragm is limited in the installation cavity, and the gap between the shell and the installation seat forms a sealed structure through welding.

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