A detection device for a direct pressure transmitter core

Abstract

The utility model discloses a detection device for direct pressure transmitter core body belongs to transmitter detection device technical field, and the support has first gas passage, when the core body is positioned on the support, the flow passage is communicated with first gas passage, the compression part has second gas passage, the compression part can be relative to the support and moves between first position and second position, when the core body is placed on the support, and the compression part is in first position, the compression part is separated from the core body to allow the taking and placing of core body, when the core body is placed on the support, and the compression part is in second position, the compression part is resisted to the embryo, and the first chamber is formed between the compression part and the embryo, and the welding part of diaphragm and embryo is located in the first chamber, second gas passage is communicated with first chamber to input first gas to first chamber, and the gas detection appearance gas inlet is communicated with first gas passage to detect first gas, and the device can improve the detection efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of transmitter testing devices, and in particular to a testing device for the core of a direct pressure transmitter. Background Technology

[0002] The core structure of a direct pressure transmitter core includes a blank, a diaphragm (such as a single-crystal silicon diaphragm) welded onto the blank, and a flow channel penetrating the blank. A cavity is formed between the diaphragm and the blank that communicates with the flow channel. The sealing of the weld between the diaphragm and the blank directly determines whether there is leakage in the core.

[0003] Currently, the industry relies heavily on manual operation for sealing tests of this welded section. The specific process involves the operator manually placing the core onto a simple support, clamping it with a manual fixture, then using a handheld air gun to spray a test gas (such as helium) around the core's surface. Finally, a gas detector is used to check for any infiltration of the test gas into the cavity. Manual operation is extremely inefficient; operators must complete multiple steps, including placing the core, clamping it, and spraying gas onto the welded section, resulting in high labor intensity. Furthermore, the test results are affected by human factors (such as clamping force and spray angle).

[0004] Therefore, there is a need to provide a direct pressure transmitter core detection device to improve detection efficiency. Utility Model Content

[0005] This utility model provides a detection device for the core of a direct pressure transmitter to solve the problems in the prior art.

[0006] The present invention adopts the following technical solution: a detection device for a direct pressure transmitter core, the core having a blank, a diaphragm welded to the blank, and a flow channel penetrating the blank, wherein a cavity communicating with the flow channel is formed between the blank and the diaphragm; The detection device includes: a support having a first gas channel; when the core is positioned on the support, the flow channel communicates with the first gas channel; a clamping member having a second gas channel; the clamping member is movable relative to the support between a first position and a second position; when the core is placed on the support and the clamping member is in the first position, the clamping member separates from the core to allow the core to be placed or removed; when the core is placed on the support and the clamping member is in the second position, the clamping member abuts against the embryo and forms a first chamber between the clamping member and the embryo, and the welded portion of the diaphragm and the embryo is located in the first chamber; the second gas channel communicates with the first chamber to input a first gas into the first chamber; and a gas detector having its inlet end communicated with the first gas channel to detect the first gas.

[0007] Preferably, an annular groove is provided on the bracket at the outer ring of the connection end between the first gas channel and the flow channel, and a sealing ring is installed in the annular groove; when the core is placed on the bracket and the clamping member is in the second position, the core presses the sealing ring into the annular groove.

[0008] Preferably, the detection device further includes an air inlet pipe mounted on the bracket, one end of which is connected to a gas source and the other end is directly opposite the second gas channel to input the first gas into the first chamber.

[0009] Preferably, the detection device further includes a linear drive source mounted on the bracket, the output shaft of which is connected to the clamping member to drive the clamping member to move relative to the bracket between a first position and a second position.

[0010] Preferably, the clamping member has an annular sidewall formed at one end near the linear drive source. The annular sidewall has an internal thread and is threaded to a sleeve. A guide rod is coaxially provided inside the sleeve and can slide relative to the sleeve along its axis. One end of the guide rod has a protrusion to prevent it from falling off the sleeve, and the other end is coaxially fixedly connected to the output shaft of the linear drive source. A nut is threaded to one end of the guide rod near the output shaft of the linear drive source, and a first spring is coaxially sleeved on the guide rod. The two ends of the first spring abut against the sleeve and the nut, respectively.

[0011] Preferably, the inner wall of the sleeve is formed with a stepped portion; under the action of the first spring, the protrusion abuts against the stepped portion.

[0012] Preferably, the outer peripheral surface of the clamping member is at least partially formed with a hexagonal clamping portion, and the outer peripheral surface of the sleeve is formed with two relatively parallel clamping surfaces.

[0013] Preferably, the clamping member is also provided with an exhaust port that communicates with the first chamber.

[0014] Preferably, the clamping member has an annular protrusion formed thereon; when the core is placed on the bracket and the clamping member is in the second position, the annular protrusion abuts against the blank to achieve axial positioning of the core.

[0015] Preferably, an annular rubber pad is also fixedly installed at the end of the annular protrusion.

[0016] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects: This utility model detection device includes: a support having a first gas channel; when the core is positioned on the support, the flow channel communicates with the first gas channel; a clamping member having a second gas channel; the clamping member is movable relative to the support between a first position and a second position; when the core is placed on the support and the clamping member is in the first position, the clamping member separates from the core to allow the core to be placed and removed; when the core is placed on the support and the clamping member is in the second position, the clamping member abuts against the embryo, forming a first chamber between the clamping member and the embryo, and the welded portion of the diaphragm and the embryo is located within the first chamber; the second gas channel communicates with the first chamber to input a first gas into the first chamber; and a gas detector, the inlet of which communicates with the first gas channel to detect the first gas. Compared with the prior art, this device can save manpower and improve detection efficiency.

[0017] When the clamping member moves from the first position to the second position, it not only presses and limits the core, but also forms a first chamber between itself and the core. The welded part of the diaphragm and the preform is completely located within the first chamber, ensuring that the detection gas (first gas) flowing in from the second gas channel can act on the welded part of the diaphragm and the preform. Compared with the existing method of manually blowing air around the core, this saves manpower, improves detection efficiency, and saves on the amount of detection gas used (the first chamber helps to prevent the rapid diffusion of the detection gas, and is applicable even in windy environments). When the core is placed on the support and the clamping member is in the second position, the core is positioned on the support, and the flow channel is connected to the first gas channel. That is, after the clamping member moves from the first position to the second position, it not only presses and limits the core, but also forms a first chamber between the clamping member and the core, and makes the flow channel connected to the first gas channel, ensuring the sealing of the channel from the cavity to the gas detector as much as possible, and ensuring the accuracy of the detection as much as possible.

[0018] In addition, the second gas channel of the clamping component can be directly connected to or linked to an external gas source, eliminating the need for operators to hold the air gun, thus improving the convenience and timeliness of testing. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 Cross-sectional view of the three-dimensional structure of this utility model Figure 1 ; Figure 3 for Figure 2Enlarged view of section A in the image; Figure 4 Cross-sectional view of the three-dimensional structure of this utility model Figure 2 ; Figure 5 for Figure 4 Enlarged view of section B in the image; Figure 6 Exploded view of the core, clamping component and bracket of this utility model; Figure 7 This is an exploded view of the core and clamping component of this utility model; Figure 8 This is a cross-sectional view of the sleeve and guide rod of this utility model.

[0020] Figure Labels 1-Embryonic body; 2-Membranes; 3-Flow channels; 4-Cavities; 5-Support; 51-First gas passage; 52-Annular groove; 53-Sealing ring; 6-Clamping component; 61-Second gas passage; 62-First chamber; 63-Annular sidewall; 64-Annular protrusion; 641-Exhaust port; 65-Hexagonal clamping part; 66-Rubber pad; 7-Intake pipe; 8-Linear drive source; 11-Sleeve; 111-Stepped portion; 112-Clamping surface; 12-Guide rod; 121-Protrusion; 13-Nut; 14 - First spring; 15 - Exhaust pipe. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0023] Reference Figures 1 to 8 As shown, this utility model embodiment provides a detection device for a direct pressure transmitter core. The core has a blank 1, a diaphragm 2 welded to the blank 1, and a flow channel 3 penetrating the blank 1. A cavity 4 communicating with the flow channel 3 is formed between the blank 1 and the diaphragm 2 (e.g., ...). Figure 3 and Figure 5 ).

[0024] Reference Figures 2 to 5As shown, the detection device comprises a support 5, a pressing member 6 and a gas detector (not shown in the figure). The support 5 is provided with a first gas channel 51; when the core body is positioned on the support 5, the flow channel 3 communicates with the first gas channel 51; the pressing member 6 is provided with a second gas channel 61; the pressing member 6 is movable relative to the support 5 between a first position and a second position; when the core body is placed on the support 5 and the pressing member 6 is at the first position, the pressing member 6 is separated from the core body to allow taking and placing of the core body; when the core body is placed on the support 5 and the pressing member 6 is at the second position (as Figure 1 and Figure 2 shown), the pressing member 6 abuts against the blank 1, and forms a first chamber 62 between the pressing member 6 and the blank 1, and the welded portion between the diaphragm 2 and the blank 1 is located in the first chamber 62; the second gas channel 61 communicates with the first chamber 62 to input a first gas into the first chamber 62.

[0025] An air inlet end of the gas detector (not shown in the figure) communicates with the first gas channel 51 through an air outlet pipe 15 to detect the first gas. In practical applications, the gas detector can be a helium detector, and the first gas input into the first chamber 62 is helium at this time.

[0026] In actual use, firstly, place the core body to be detected on the support 5, so that the flow channel 3 of the core body communicates with the first gas channel 51 of the support 5; then, move the pressing member 6 from the first position to the second position, at this time the pressing member 6 closely abuts against the blank 1, and forms the first chamber 62 between the two (the welded portion between the diaphragm 2 and the blank 1 is completely located in the first chamber 62), ensuring that the detection gas introduced into the first chamber 62 can act on the welding area (the welded portion between the diaphragm and the blank); then, continuously input detection gas (i.e., the first gas, such as helium) into the first chamber 62 through the second gas channel 61 of the pressing member 6, so that the area around the welded portion between the diaphragm 2 and the blank 1 is filled with the detection gas. The air inlet end of the gas detector communicates with the first gas channel 51 of the support 5 through the air outlet pipe 15, so as to detect whether there is leakage at the welded portion between the diaphragm 2 and the blank 1: if there is leakage at the welded portion between the diaphragm 2 and the blank 1, the detection gas will enter the cavity 4 between the blank 1 and the diaphragm 2 through the leakage point, then flow into the first gas channel 51 through the flow channel 3 of the core body, and finally enter the air inlet end of the gas detector through the air outlet pipe 15, and the gas detector (e.g., helium detector) will detect helium, and it is determined that there is leakage; on the contrary, if no helium is detected, it means that the welding sealing is qualified. That is, whether there is leakage at the welded portion between the diaphragm 2 and the blank 1 is determined by whether the gas detector detects helium. Within the alternative range of those skilled in the art, other inert gases can also be selected to be input into the first chamber 62 as the first gas, which will not be listed one by one here; at this time, the gas detector also needs to be adjusted accordingly to detect the inert gas.

[0027] In this embodiment, when the clamping member 6 moves from the first position to the second position, it not only achieves pressure and limitation on the core, but also forms a first chamber 62 between itself and the core. The welding part of the diaphragm 2 and the preform 1 is completely located in the first chamber 62, ensuring that the detection gas (first gas) flowing in from the second gas channel 61 can act on the aforementioned welding part. Compared with the existing method of manually blowing air around the core, this method saves manpower and improves detection efficiency, and also saves the amount of detection gas used (the first chamber helps to prevent the rapid diffusion of detection gas, and it is applicable even in windy usage scenarios). When the core is placed on the support 5 and the clamping member 6 is in the second position, the core is positioned on the support 5, and the flow channel 3 is connected to the first gas channel 51. That is, after the clamping member 6 moves from the first position to the second position, it not only achieves pressure and limitation on the core, but also forms a first chamber 62 between the clamping member 6 and the core, and also connects the flow channel 3 to the first gas channel 51, ensuring the sealing of the channel from the chamber to the gas detector (chamber 4-flow channel 3-first gas channel 51-outlet pipe 15-gas detector) as much as possible, and ensuring the accuracy of the detection as much as possible. At the same time, the second gas channel 61 of the clamping member 6 can be directly connected to or connected to an external gas source, eliminating the need for operators to hold the air gun, improving the convenience and timeliness of the detection. Even when the operator is still holding the air gun, the operator only needs to align the air gun's outlet with the second gas channel 61, and the detection gas will enter the first chamber 62 and quickly reach the target concentration, which improves the detection efficiency to a certain extent. In addition, compared with the existing technology where the operator holds the air gun and blows air around the core, in this solution, the operator does not need to move the air gun, which also improves the convenience of operation to a certain extent.

[0028] In some practical applications, to ensure the airtightness of the channel from cavity 4 to the gas detector, refer to... Figure 3 , Figure 6 and Figure 7 As shown, an annular groove 52 is provided on the bracket 5 at the outer ring of the connection end between the first gas channel 51 and the flow channel 3. A sealing ring 53 is installed in the annular groove 52. When the core is placed on the bracket 5 and the clamping member 6 is in the second position, the blank 1 presses the sealing ring 53 into the annular groove 52. In this embodiment, the annular groove 52 is used to position the core. At the same time, the sealing ring 53 installed in the annular groove 52 ensures that after the core is positioned, the flow channel 3 of the core and the gas inlet of the gas detector form a sealed and unique channel, so as to avoid the flow channel 3 from communicating with the external environment through the gap between the bracket 5 and the core, thereby affecting the accuracy of the gas detector test.

[0029] In some practical applications, the detection device also includes an air inlet pipe 7 mounted on the bracket 5 (e.g., Figure 4 and Figure 5 One end of the air inlet pipe 7 (air inlet end) is connected to the air source, and the other end (air outlet end) is directly opposite the second gas channel 61 to input the first gas into the first chamber 62. The air inlet pipe 7 is fixed on the bracket 5. When the clamping member 6 is in the second position, the other end (air outlet end) of the air inlet pipe 7 is directly opposite the second gas channel 61, and air can be directly supplied into the air inlet pipe 7 through an external air source; during the overall detection process, there is no need for the operator to hold the air gun to blow air. It should be noted that in this embodiment, there is still a gap between the other end (air outlet end) of the air inlet pipe 7 and the second gas channel 61 (to avoid interference between the clamping member and the air inlet pipe when it moves between the first and second positions). It is necessary to ensure that the detection gas (first gas) continuously enters the first chamber 62 so that the detection gas in the first chamber 62 maintains a certain pressure.

[0030] In some practical applications, refer to Figures 2 to 5 As shown, the detection device also includes a linear drive source 8 (such as...) mounted on the bracket 5. Figure 1 The output shaft of the linear drive source 8 is connected to the clamping member 6 to drive the clamping member 6 to move relative to the bracket 5 between a first position and a second position. Specifically, an annular sidewall 63 is formed on the clamping member 6 near the linear drive source 8. The annular sidewall 63 has internal threads tapped on its inner side and is threadedly connected to a sleeve 11. A guide rod 12, which can slide relative to the sleeve 11 along its axis, is coaxially provided inside the sleeve 11. One end of the guide rod 12 has a protrusion 121 (e.g., to prevent it from falling off the sleeve 11) to prevent it from falling off. Figure 8 The other end is coaxially fixedly connected to the output shaft of the linear drive source 8; a nut 13 is threadedly connected to one end of the guide rod 12 near the output shaft of the linear drive source 8, and a first spring 14 is coaxially sleeved on the guide rod 12, with the two ends of the first spring 14 abutting against the sleeve 11 and the nut 13 respectively.

[0031] Specifically, the inner wall of the sleeve 11 is formed with a stepped portion 111 (e.g., Figure 8 Under the action of the first spring 14, the protrusion 121 abuts against the step portion 111.

[0032] Specifically, refer to Figures 7 to 8 As shown, the outer peripheral surface of the clamping member 6 is at least partially formed with a hexagonal clamping portion 65, and the outer peripheral surface of the sleeve 11 is formed with two relatively parallel clamping surfaces 112.

[0033] In this embodiment, the linear drive source 8 (such as a cylinder or electric push rod) is fixed to the bracket 5, and the output shaft is rigidly connected to the guide rod 12 coaxially, driving the guide rod 12 to reciprocate along the axis. The guide rod 12 passes into the sleeve 11, and one end is provided with a protrusion 121. The diameter of the protrusion 121 is larger than the inner diameter of the stepped portion 111 on the inner wall of the sleeve 11 to prevent the guide rod 12 from falling off. The end of the guide rod 12 near the linear drive source 8 is threadedly connected to a nut 13, and a first spring 14 is coaxially sleeved thereon. The two ends of the first spring 14 abut against the end face of the sleeve 11 and the nut 13, respectively. The external thread of the sleeve 11 engages with the internal thread of the annular sidewall 63 of the clamping member 6 to achieve a detachable connection. The clamping member 6 is provided with a hexagonal clamping portion 65 on its outer periphery, and the sleeve 11 is provided with a parallel clamping surface 112 on its outer periphery, which facilitates the disassembly and assembly of the sleeve 11 using tools such as wrenches.

[0034] In actual use, the output shaft of the linear drive source 8 extends, pushing the guide rod 12 forward. The guide rod 12 drives the sleeve 11 and the clamping member 6 to move towards the core. After the clamping member 6 contacts the core, the output shaft of the linear drive source 8 continues to extend, and the guide rod 12 slides relative to the sleeve 11, compressing the first spring 14, so that the clamping member 6 elastically presses against the core, and a first chamber 62 is formed between the clamping member 6 and the core. The clamping process of the clamping member 6 against the core has no rigid impact (compared to hard contact).

[0035] The linear drive source 8 replaces manual clamping, and with the automatic intake of the first gas, the time required for single-piece testing is reduced, making it suitable for the mass production needs of monocrystalline silicon pressure transmitter cores. The elastic buffer of the first spring 14 avoids rigid impact from the clamping part 6, preventing damage to the core; in addition, the preload of the first spring 14 can be adjusted by adjusting the position of the nut 13 to adapt to the pressure requirements of different core models.

[0036] In some practical applications, refer to Figure 5 As shown, the clamping member 6 is also provided with an exhaust port 641 communicating with the first chamber 62. When the first gas is introduced into the first chamber 62, the excess first gas is discharged through the exhaust port 641, preventing the pressure in the first chamber 62 from continuously increasing, which could cause the diaphragm 2 to deform and rupture excessively or the welded part to break off. The size of the exhaust port 641 can be set according to requirements to ensure that the pressure in the first chamber 62 is maintained above the minimum threshold required for detection, preventing small leaks from going undetected due to insufficient pressure. Through the exhaust port 641, the pressure in the first chamber 62 can always be kept within a preset reasonable range (e.g., 4-6 bar).

[0037] In addition, the exhaust port 641 in this embodiment allows the detection gas to flow in a specific direction, avoiding airflow turbulence (such as local high pressure or low pressure) in the first chamber 62, thereby ensuring that the detection gas covers the welding part of the diaphragm 2 and the preform 1 relatively uniformly as much as possible, and improving the detection accuracy.

[0038] In some practical applications, based on the above embodiments, the clamping member 6 has an annular protrusion 64 (e.g., Figure 7 When the core is placed on the support 5 and the clamping member 6 is in the second position, the annular protrusion 64 abuts against the blank 1 to achieve axial positioning of the core. An annular rubber pad 66 is also fixedly installed at the end of the annular protrusion 64. When the clamping member 6 is in the second position, the annular protrusion 64 abuts against the blank 1 through the rubber pad 66, providing axial positioning; the rubber pad 66 utilizes the elastic deformation of rubber to fill the minute gaps (such as gaps caused by machining accuracy errors) between the annular protrusion 64 and the surface of the blank 1. The rubber pad 66 prevents scratches and deformation caused by direct hard contact between the annular protrusion 64 and the blank 1, protecting the core blank 1. After being compressed, the rubber pad 66 fills the gap between the annular protrusion 64 and the blank 1, preventing gas in the first chamber 62 from leaking from the contact gap between the core and the clamping member 6. If there is a gap between the annular protrusion 64 and the embryo 1, the location and amount of gas leakage will be uncontrollable (while the opening size of the exhaust port 641 can be determined manually), which will cause pressure fluctuations in the first chamber 62 and thus affect the accuracy of the test results.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A detection device for a core of a direct pressure transmitter, the core having a blank (1), a diaphragm (2) welded to the blank (1), and a flow channel (3) penetrating the blank (1), wherein a cavity (4) communicating with the flow channel (3) is formed between the blank (1) and the diaphragm (2). Its features are, The detection device includes: The support (5) has a first gas channel (51); when the core is positioned on the support (5), the flow channel (3) is connected to the first gas channel (51); A clamping member (6) having a second gas passage (61); the clamping member is movable relative to the support (5) between a first position and a second position; when the core is placed on the support (5) and the clamping member (6) is in the first position, the clamping member separates from the core to allow the core to be placed or removed; when the core is placed on the support (5) and the clamping member (6) is in the second position, the clamping member abuts against the embryo (1) and forms a first chamber (62) between the clamping member and the embryo (1), and the welded portion of the diaphragm (2) and the embryo (1) is located in the first chamber (62); the second gas passage (61) communicates with the first chamber (62) to introduce a first gas into the first chamber (62); A gas detector, the gas inlet of which is connected to the first gas channel (51) to detect the first gas.

2. The detection device for the core of a direct pressure transmitter according to claim 1, characterized in that, An annular groove (52) is provided on the bracket (5) and on the outer ring of the connection end between the first gas channel (51) and the flow channel (3), and a sealing ring (53) is installed in the annular groove. When the core is placed on the bracket (5) and the clamping member (6) is in the second position, the blank (1) presses the sealing ring (53) into the annular groove (52).

3. The detection device for the core of a direct pressure transmitter according to claim 1, characterized in that, The detection device also includes an air inlet pipe (7) installed on the bracket (5), one end of which is connected to a gas source and the other end is directly opposite the second gas channel (61) to input the first gas into the first chamber (62).

4. The detection device for the core of a direct pressure transmitter according to claim 1, characterized in that, The detection device also includes a linear drive source (8) mounted on the bracket (5), the output shaft of which is connected to the clamping member (6) to drive the clamping member (6) to move relative to the bracket (5) between a first position and a second position.

5. The detection device for the core of a direct pressure transmitter according to claim 4, characterized in that, An annular sidewall (63) is formed on the clamping member (6) at one end near the linear drive source (8). The annular sidewall has an internal thread and is threaded to a sleeve (11). A guide rod (12) is coaxially provided inside the sleeve and can slide relative to the sleeve (11) along its axis. One end of the guide rod has a protrusion (121) to prevent it from falling off the sleeve (11), and the other end is coaxially fixedly connected to the output shaft of the linear drive source (8). A nut (13) is threaded to one end of the guide rod (12) near the output shaft of the linear drive source (8). A first spring (14) is coaxially sleeved on the guide rod (12), and the two ends of the first spring abut against the sleeve (11) and the nut (13) respectively.

6. The detection device for the core of a direct pressure transmitter according to claim 5, characterized in that, The inner wall of the sleeve (11) is formed with a stepped portion (111); under the action of the first spring (14), the protrusion (121) abuts against the stepped portion (111).

7. The detection device for the core of a direct pressure transmitter according to claim 5, characterized in that, The outer peripheral surface of the clamping member (6) is at least partially formed with a hexagonal clamping portion (65), and the outer peripheral surface of the sleeve (11) is formed with two relatively parallel clamping surfaces (112).

8. The detection device for the core of a direct pressure transmitter according to claim 1, characterized in that, The clamping member (6) is also provided with an exhaust port (641) that communicates with the first chamber (62).

9. The detection device for the core of a direct pressure transmitter according to claim 1 or 8, characterized in that, An annular protrusion (64) is formed on the clamping member (6); when the core is placed on the bracket (5) and the clamping member (6) is in the second position, the annular protrusion (64) abuts against the blank (1) to achieve axial positioning of the core.

10. The detection device for the core of a direct pressure transmitter according to claim 9, characterized in that, An annular rubber pad (66) is also fixedly installed at the end of the annular protrusion (64).

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