Pressure sensor with limited inner core

Abstract

The invention discloses a pressure sensor with a limited inner core. The pressure sensor comprises a sensor shell, and a pressure sensing core body is arranged in an inner cavity of the sensor shell; the inner cavity is provided with a cavity opening, a shell cover is fixedly installed at the cavity opening, a limiting groove is formed in the bottom of the shell cover, the shape of the limiting groove is matched with that of the pressure sensing core body, and the limiting groove is correspondingly buckled on the pressure sensing core body so as to limit displacement of the pressure sensing core body in the inner cavity; a plurality of clamping blocks are arranged on the shell cover, a plurality of clamping grooves are formed in the cavity opening of the inner cavity of the sensor shell, and the clamping blocks are correspondingly clamped into the clamping grooves so as to fix the shell cover at the cavity opening of the inner cavity; the clamping blocks are arranged on the peripheral side wall of the shell cover, and the shell cover can be extruded into the inner cavity from the cavity opening, so that the clamping blocks are clamped into the clamping grooves after being extruded and deformed. After the clamping blocks are clamped into the clamping grooves, the peripheral side wall of the shell cover is attached to the inner wall of the inner cavity. According to the invention, displacement of the pressure sensing core body in the pressure sensor can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of pressure sensors, and in particular to a pressure sensor with an inner core limit. Background Art

[0002] Pressure sensors are often used to measure the pressure of fluids. The pressure-sensitive core is the pressure measuring element of the pressure sensor. In a pressure sensor, whether the position of the pressure-sensitive core is stable will affect the measurement accuracy of the pressure sensor. In this regard, a pressure sensor with an inner core limit is proposed. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a pressure sensor with an inner core limiter, which aims to prevent the pressure-sensitive core from shifting inside the pressure sensor.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a pressure sensor with an inner core limit, the pressure sensor comprising a sensor housing, wherein there is a pressure-sensitive core in the inner cavity of the sensor housing; the inner cavity has a cavity opening, a shell cover is fixedly installed at the cavity opening, a limiting groove is provided at the bottom of the shell cover, the limiting groove is adapted to the shape of the pressure-sensitive core, and the limiting groove is correspondingly buckled on the pressure-sensitive core to limit the displacement of the pressure-sensitive core in the inner cavity.

[0005] Furthermore, the shell cover is provided with a plurality of card blocks, and the inner cavity opening of the sensor housing is provided with a plurality of card slots, and the card blocks are correspondingly inserted into the card slots to fix the shell cover at the inner cavity opening.

[0006] Furthermore, the card block is arranged on the outer peripheral side wall of the shell cover, and the shell cover can be squeezed from the cavity opening into the inner cavity, so that the card block is squeezed and deformed and then inserted into the card slot; after the card block is inserted into the card slot, the outer peripheral side wall of the shell cover fits with the inner wall of the inner cavity.

[0007] Furthermore, the card slot passes through the sensor housing, so that the card slot has an outer slot and an inner slot; the inner slot is opposite to the inner wall of the inner cavity, and the card block is inserted into the card slot from the inner slot; the outer slot is opposite to the outer wall of the sensor housing, and an external plug-in is inserted into the outer slot, and the external plug-in has a first insertion part and a second insertion part, the first insertion part can be squeezed into the gap between the card block and the card slot, and the second insertion part can be squeezed into the gap between the limit groove and the pressure-sensitive core.

[0008] Furthermore, the first insertion part is a horizontal insertion piece, which is correspondingly squeezed into the horizontal gap between the upper end surface of the card block and the top wall of the card slot; the second insertion part includes an insertion handle, and a downward bent block is provided at the front end of the insertion handle; the shell cover is provided with a connecting hole, and the insertion handle can be squeezed into the connecting hole in a bent state, and after the bent block at the front end of the insertion handle passes through the connecting hole, the bent block can be squeezed into the annular gap between the limit groove and the pressure-sensitive core, and the insertion handle is restored from the bent state.

[0009] Furthermore, a downward slope surface is arranged above the inner notch opening of the card slot, and the card block can be squeezed and deformed along the downward slope surface and squeezed into the inner notch opening of the card slot.

[0010] Furthermore, a first sealing ring is arranged in the inner cavity, the first sealing ring correspondingly surrounds the pressure-sensitive core, and the lower edge of the shell cover is pressed on the first sealing ring.

[0011] Furthermore, a placement groove is provided at the bottom of the inner cavity, the placement groove is adapted to the shape of the pressure-sensitive core, and the placement groove and the limiting groove jointly limit the pressure-sensitive core.

[0012] Furthermore, a detection groove is arranged at the bottom of the placement groove, and the pressure-sensitive surface of the pressure-sensitive core is opposite to the detection groove; a fluid input channel is arranged in the sensor housing, and the fluid input channel is connected to the detection groove.

[0013] Furthermore, a second sealing ring is arranged in the detection groove, and the second sealing ring is squeezed between the pressure-sensitive core and the detection groove; one end opening of the fluid input channel is connected to the outside, and the other end opening of the fluid input channel is located in the second sealing ring.

[0014] Beneficial effects: The pressure sensor with inner core limit of the present invention has the following beneficial effects:

[0015] 1) A limit groove is provided on the shell cover of the pressure sensor, and the limit groove is buckled on the pressure sensing core body to limit the displacement of the pressure sensing core body in the sensor housing;

[0016] 2) The shell cover is fixed to the sensor housing through the cooperation of the clamping block and the clamping slot. There is an external plug-in on the outer notch of the clamping slot. Different parts of the external plug-in can be respectively inserted into the gap between the clamping block and the clamping slot, and the gap between the limit groove and the pressure-sensitive core, thereby further clamping the shell cover and the pressure-sensitive core, which can more effectively prevent the pressure-sensitive core from shifting in the sensor housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 Schematic diagram of the internal structure of the pressure sensor;

[0018] Attached Figure 2 It is a schematic diagram of the cooperation between the card block and the card slot;

[0019] Attached Figure 3 It is a schematic diagram of the structure of the external plug-in;

[0020] Attached Figure 4 Schematic diagram of the limiting groove at the bottom of the shell cover. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] As attached Figures 1 to 4The pressure sensor with inner core limit comprises a sensor housing 1, a housing and a pressure sensing core 2. The interior of the sensor housing 1 is an inner cavity 3, and the pressure sensing core 2 is located in the inner cavity 3. The upper part of the inner cavity 3 has a cavity opening, and the housing cover 4 can be fixedly installed at the cavity opening of the inner cavity 3. Figure 4 As shown in FIG, a limiting groove 5 is provided at the bottom of the shell cover 4, and the limiting groove 5 is adapted to the shape of the pressure-sensitive core 2. When the shell cover 4 is fixedly installed at the opening of the inner cavity 3, the limiting groove 5 at the bottom of the shell cover 4 is correspondingly buckled on the pressure-sensitive core 2 to limit the displacement of the pressure-sensitive core 2 in the inner cavity 3. As a result, the stability of the pressure-sensitive core 2 in the pressure sensor is better, which is conducive to improving the measurement accuracy of the pressure-sensitive core 2.

[0023] As attached Figure 1 and 4 As shown in , a plurality of card blocks 6 are arranged on the shell cover 4, and a plurality of card slots 7 are arranged at the opening of the inner cavity 3 of the sensor housing 1. The card blocks 6 are correspondingly inserted into the card slots 7 to fix the shell cover 4 at the opening of the inner cavity 3. Specifically, the card blocks 6 are arranged on the outer peripheral side wall of the shell cover 4. The shell cover 4 is placed at the opening of the inner cavity 3, and the shell cover 4 can be squeezed from the opening to the inner cavity 3. During the squeezing process of the shell cover 4, the sensor housing 1 and the card blocks 6 will be deformed to a certain extent. After the squeezing deformation, the card blocks 6 will be inserted into the card slots 7, thereby fixing the shell cover 4 at the opening of the inner cavity 3.

[0024] The slot 7 passes through the sensor housing 1, so that the slot 7 has an outer slot and an inner slot, wherein the inner slot is opposite to the inner wall of the inner cavity 3, and the outer slot is opposite to the outer wall of the sensor housing 1. The block 6 can be inserted into the slot 7 from the inner slot, and after the block 6 is inserted into the slot 7, the outer peripheral side wall of the shell cover 4 fits with the inner wall of the inner cavity 3, so that the shell cover 4 will not shake in the horizontal direction. However, since the block 6 is gradually squeezed into the slot 7 after deformation, after the block 6 is inserted into the slot 7, the block 6 and the slot 7 are not completely close in the vertical direction, that is, as shown in the attached Figure 2 As shown in , a transverse gap 12 is formed between the upper end surface of the block 6 and the top wall of the slot 7. In addition, during the compression of the block 6, a certain degree of deformation will occur at the limit groove 5, so the limit groove 5 is slightly larger than the pressure-sensitive core 2, so an annular gap 13 is formed between the limit groove 5 and the pressure-sensitive core 2. Due to the existence of the transverse gap 12 and the annular gap 13, the pressure-sensitive core 2 still has a certain displacement space in the sensor housing 1, thereby affecting the measurement accuracy of the pressure-sensitive core 2.

[0025] Based on the above reasons, Figure 3As shown in the figure, an external plug-in unit 8 is inserted at the external slot, and the external plug-in unit 8 has a first insertion portion and a second insertion portion. The first insertion portion can be squeezed into the transverse gap 12 between the card block 6 and the card slot 7, and the second insertion portion can be squeezed into the annular gap 13 between the limit slot 5 and the pressure-sensitive core 2, thereby preventing the pressure-sensitive core 2 from being displaced in the sensor housing 1.

[0026] As attached Figure 3 As shown in the figure, specifically, the first insertion part is a transverse insert 9, which is correspondingly squeezed into the transverse gap 12 between the upper end surface of the block 6 and the top wall of the slot 7, and the upper and lower end surfaces of the transverse insert 9 are respectively close to the top wall of the slot 7 and the upper end surface of the block 6.

[0027] The second insertion part includes an insertion handle 10, and a downwardly bent block 11 is provided at the front end of the insertion handle 10. The shape of the bent block 11 is arc-shaped and adapted to the shape of the annular gap 13. A connecting hole 23 is provided on the shell cover 4, one end of the connecting hole 23 is connected to the card slot 7, and the other end of the connecting hole 23 is located above the annular gap 13. The insertion handle 10 can be squeezed into the connecting hole 23 in a bent state. After the bent block 11 at the front end of the insertion handle 10 passes through the connecting hole 23, the bent block 11 can be squeezed into the annular gap 13 between the limiting groove 5 and the pressure-sensitive core 2, and the insertion handle 10 is restored from the bent state.

[0028] The transverse insert 9 is integrally connected with the plug handle 10, the spacing between the transverse insert 9 and the plug handle 10 is the plug spacing, the spacing between the transverse gap 12 and the connecting hole 23 is the socket spacing, and the socket spacing is consistent with the plug spacing. The aperture of the connecting hole 23 is not less than the outer diameter of the bending block 11, so that the bending block 11 can be inserted into the connecting hole 23. When the bending block 11 is inserted into the connecting hole 23 and the transverse insert 9 is inserted into the transverse gap 12, the plug handle 10 is in a bent deformation state. After the bending block 11 passes through the connecting hole 23, the bending block 11 will squeeze into the annular gap 13, and the plug handle 10 will be restored from the bent state. The bending block 11 can prevent the restored plug handle 10 from being withdrawn from the connecting hole 23, so as to fix the external plug 8 at the outer notch.

[0029] The spacing between the plug-ins is consistent with the height of the card slot 7, so when the bending block 11 is squeezed into the annular gap 13, the upper end surface of the horizontal plug-in piece 9 is in contact with the top wall of the card slot 7, and the lower end surface of the plug-in handle 10 is in contact with the bottom wall of the card slot 7, so that the external plug-in piece 8 can be stably installed at the outer notch of the card slot 7. The horizontal plug-in piece 9 and the plug-in handle 10 are integrally connected through the panel 20. When the bending block 11 is squeezed into the annular gap 13, the panel 20 correspondingly seals the outer notch of the card slot 7.

[0030] In the external plug-in unit 8, the bent block 11 has two functions. One is to squeeze into the annular gap 13. After multiple bent blocks 11 are inserted into the annular gap 13, the pressure-sensitive core 2 is prevented from being displaced in the sensor housing 1. The second is to prevent the handle 10 from being pulled out of the connecting hole 23, thereby fixing the external plug-in unit 8 in the outer notch of the card slot 7, which is convenient for the installation of the external plug-in unit 8.

[0031] As attached Figure 1 As shown in the figure, a lower slope surface 19 is arranged above the inner notch of the card slot 7, and the card block 6 can be squeezed and deformed along the lower slope surface 19 and squeezed into the inner notch of the card slot 7, so that the card block 6 is easier to be inserted into the card slot 7. The card block 6 itself is in the shape of a barb, and the card block 6 is not easy to fall out after being inserted into the card slot 7.

[0032] A first sealing ring 14 is disposed in the inner cavity 3 , and the first sealing ring 14 surrounds the pressure-sensitive core 2 , and the lower edge of the shell cover 4 is pressed on the first sealing ring 14 .

[0033] The bottom of the inner cavity 3 is provided with a placement groove 15, which is adapted to the shape of the pressure-sensitive core 2 and is slightly larger than the pressure-sensitive core 2. The placement groove 15 and the limiting groove 5 limit the pressure-sensitive core 2 together. A detection groove 16 is provided at the bottom of the placement groove 15, and the pressure-sensitive surface of the pressure-sensitive core 2 is opposite to the detection groove 16. A fluid input channel 17 is provided in the sensor housing 1, and the fluid input channel 17 is connected to the detection groove 16. A second sealing ring 18 is provided in the detection groove 16, and the second sealing ring 18 is squeezed between the pressure-sensitive core 2 and the detection groove 16 to prevent the input detection object from leaking from the detection groove 16 to other positions of the inner cavity 3. One end of the fluid input channel 17 is connected to the outside, and the other end of the fluid input channel 17 is located in the second sealing ring 18. The detection object can be gas or liquid, and the gas or liquid enters the detection groove 16 along the fluid input channel 17, and its pressure is detected by the pressure-sensitive core 2. There is a circuit board 21 in the sensor housing 1 . The circuit board 21 is connected to the pressure-sensitive core 2 . There are pins 22 on the circuit board 21 . The pins 22 extend out of the sensor housing 1 to output the fluid pressure information measured by the pressure-sensitive core 2 .

[0034] The present invention also provides a method for installing a shell cover 4 of a pressure sensor with an inner core limit, wherein the shell cover 4 is placed at the opening of the inner cavity 3 of the sensor housing 1, and the shell cover 4 is squeezed into the inner cavity 3; after the multiple clamping blocks 6 on the shell cover 4 are squeezed and deformed, they are respectively inserted into the multiple clamping slots 7 on the sensor housing 1; then the external plug-in 8 is inserted into the outer notch of the clamping slot 7, so that the transverse insert 9 is squeezed into the transverse gap 12, and the bending block 11 is squeezed into the annular gap 13, thereby completing the installation of the shell cover 4. In this installation method, since the external plug-in 8 is additionally added, the position of the pressure-sensitive core 2 in the pressure sensor can be made more stable.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pressure sensor with inner core limit, characterized in that: The pressure sensor comprises a sensor housing (1), wherein an inner cavity (3) of the sensor housing (1) contains a pressure-sensitive core (2); the inner cavity (3) has a cavity opening, a shell cover (4) is fixedly mounted at the cavity opening, a limiting groove (5) is arranged at the bottom of the shell cover (4), the limiting groove (5) is adapted to the shape of the pressure-sensitive core (2), and the limiting groove (5) is correspondingly buckled on the pressure-sensitive core (2) to limit the displacement of the pressure-sensitive core (2) in the inner cavity (3).

2. The inner core limit pressure sensor according to claim 1, characterized in that: A plurality of card blocks (6) are provided on the shell cover (4), and a plurality of card slots (7) are provided at the opening of the inner cavity (3) of the sensor housing (1), and the card blocks (6) are correspondingly inserted into the card slots (7) to fix the shell cover (4) at the opening of the inner cavity (3).

3. The inner core limit pressure sensor according to claim 2, characterized in that: The clamping block (6) is arranged on the outer peripheral side wall of the shell cover (4), and the shell cover (4) can be squeezed from the cavity opening into the inner cavity (3), so that the clamping block (6) is squeezed and deformed and then clamped into the clamping groove (7); after the clamping block (6) is clamped into the clamping groove (7), the outer peripheral side wall of the shell cover (4) fits with the inner wall of the inner cavity (3).

4. The inner core limit pressure sensor according to claim 3, characterized in that: The card slot (7) passes through the sensor housing (1), so that the card slot (7) has an outer slot and an inner slot; the inner slot is opposite to the inner wall of the inner cavity (3), and the card block (6) is inserted into the card slot (7) from the inner slot; the outer slot is opposite to the outer wall of the sensor housing (1), and an external plug-in unit (8) is inserted into the outer slot, and the external plug-in unit (8) has a first insertion portion and a second insertion portion, the first insertion portion can be squeezed into the gap between the card block (6) and the card slot (7), and the second insertion portion can be squeezed into the gap between the limit slot (5) and the pressure sensing core (2).

5. The inner core limit pressure sensor according to claim 4, characterized in that: The first insertion part is a transverse insertion piece (9), which is correspondingly inserted into the transverse gap (12) between the upper end surface of the card block (6) and the top wall of the card slot (7); the second insertion part comprises an insertion handle (10), and a downwardly bent block (11) is provided at the front end of the insertion handle (10); a connecting hole (23) is provided on the shell cover (4), and the insertion handle (10) can be inserted into the connecting hole (23) in a bent state, and after the bent block (11) at the front end of the insertion handle (10) passes through the connecting hole (23), the bent block (11) can be inserted into the annular gap (13) between the limit groove (5) and the pressure-sensitive core (2), and the insertion handle (10) is restored from the bent state.

6. The inner core limit pressure sensor according to claim 4, characterized in that: A lower slope surface (19) is arranged above the inner notch opening of the clamping slot (7), and the clamping block (6) can be squeezed and deformed along the lower slope surface (19) and squeezed into the inner notch opening of the clamping slot (7).

7. The inner core limit pressure sensor according to claim 4, characterized in that: A first sealing ring (14) is arranged in the inner cavity (3), the first sealing ring (14) correspondingly surrounds the pressure-sensitive core (2), and the lower edge of the shell cover (4) is pressed on the first sealing ring (14).

8. The inner core limit pressure sensor according to claim 1, characterized in that: The bottom of the inner cavity (3) is provided with a placement groove (15), the placement groove (15) is adapted to the shape of the pressure-sensitive core (2), and the placement groove (15) and the limiting groove (5) jointly limit the pressure-sensitive core (2).

9. The inner core limit pressure sensor according to claim 8, characterized in that: A detection groove (16) is arranged at the bottom of the placement groove (15), and the pressure-sensitive surface of the pressure-sensitive core (2) is opposite to the detection groove (16); a fluid input channel (17) is arranged in the sensor housing (1), and the fluid input channel (17) is connected to the detection groove (16).

10. The inner core limit pressure sensor according to claim 9, characterized in that: A second sealing ring (18) is arranged in the detection groove (16), and the second sealing ring (18) is squeezed between the pressure-sensitive core (2) and the detection groove (16); one end opening of the fluid input channel (17) is connected to the outside, and the other end opening of the fluid input channel (17) is located in the second sealing ring (18).

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