Piezoresistive pressure transmitter

Abstract

The utility model relates to the technical field of pressure transmitters, in particular to a piezoresistive pressure transmitter, which comprises a protective sleeve, a plate sleeve is welded on one side of the protective sleeve, a baffle is sleeved inside the plate sleeve in a penetrating manner, a sealing piston is arranged inside the protective sleeve, and the sealing piston is connected with the baffle. A compression spring is clamped and fixed between the sealing piston and the protective sleeve; the top of the protective sleeve is sleeved with a piezoresistive transmission body, the bottom end of the piezoresistive transmission body penetrates through the interior of the sealing piston through a threaded groove, and a filter screen is fixedly clamped in the protective sleeve through a clamping groove. Media flowing into the protective sleeve are filtered by the filter screen, impurities and the like are prevented from entering the protective sleeve to be in contact with the piezoresistive transmission body, and the baffle is inserted into the protective sleeve from the plate sleeve to block the media, so that the media cannot be in contact with the piezoresistive transmission body when detection is not carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure transmitters, in particular to a piezoresistive pressure transmitter. Background Art

[0002] A pressure transmitter is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission. A pressure transmitter is a type of pressure transmitter. Its working principle is based on the piezoresistive effect of the material. When the pressure of the measured medium acts on the inside of the elastic tube, the elastic tube will bend and deform. At this time, the resistance of the elastic tube changes, and the absolute value of the bending is proportional to the pressure of the medium. By measuring the change in resistance, the pressure change of the measured medium can be reflected.

[0003] The existing piezoresistive pressure transmitter is directly fixed in a pipeline or a container filled with a medium. If the medium contacts the U-shaped elastic tube in the piezoresistive pressure transmitter for a long time, it is easy to cause the U-shaped elastic tube to deform or corrode, thereby affecting the detection result of the piezoresistive pressure transmitter. Therefore, a piezoresistive pressure transmitter is proposed, which has a telescopic structure, moves downward for detection, and moves upward after the detection is completed, so as to avoid the U-shaped elastic tube in the piezoresistive pressure transmitter from contacting with the medium for a long time. Utility Model Content

[0004] In view of the problems in the prior art, the utility model provides a piezoresistive pressure transmitter with a telescopic structure, which moves downward for detection and moves upward after the detection is completed, thereby preventing the U-shaped elastic tube in the piezoresistive pressure transmitter from contacting the medium for a long time.

[0005] The technical solution adopted by the utility model to solve the technical problem is a piezoresistive pressure transmitter, comprising a protective sleeve, a plate sleeve is welded on one side of the protective sleeve, a baffle is provided through the plate sleeve, a sealing piston is provided inside the protective sleeve, and a compression spring is clamped and fixed between the sealing piston and the protective sleeve;

[0006] The top of the protective sleeve is sleeved with a piezoresistive transmission body, the bottom end of the piezoresistive transmission body penetrates the interior of the sealing piston through a threaded groove, and a filter is fixedly engaged with the interior of the protective sleeve through a clamping groove.

[0007] By adopting the above technical solution, the baffle is inserted into the protective sleeve from the plate sleeve to block the medium so that the medium does not contact the piezoresistive transmission body. The filter can filter the medium entering the protective sleeve to prevent impurities from entering the protective sleeve.

[0008] Specifically, limiting strips are welded at both ends of the inner side of the protective sleeve, and limiting sliding grooves are provided on both sides of the sealing piston, and the limiting sliding grooves are located outside the limiting strips.

[0009] Specifically, exhaust holes are uniformly opened through the top of the protective sleeve, and a protective net is arranged inside the exhaust holes.

[0010] Specifically, a sealing gasket is glued to the inner side of the plate sleeve, and a sealing strip is glued to the outer side of the baffle.

[0011] Specifically, limiting blocks are welded on both sides of the baffle, an anti-slip groove is opened at one end of the baffle, and a reserved groove is opened at the other end of the baffle.

[0012] Specifically, a butt pipe is welded at the bottom of the protective sleeve.

[0013] Beneficial effects of the utility model:

[0014] (1) In the piezoresistive pressure transmitter described in the utility model, the medium in the pipeline or container flows into the protective sleeve through the butt-joint pipe and is filtered by the filter screen to prevent impurities in the medium from entering the protective sleeve. The baffle is inserted from the plate sleeve into the protective sleeve to block the medium so that the medium does not enter the protective sleeve and avoid contact with the bottom of the piezoresistive transmission body.

[0015] (2) When the piezoresistive pressure transmitter described in the utility model needs to be tested, the baffle is pulled to move one end of it from the protective sleeve to the plate sleeve, and the medium in the pipeline or container flows into the protective sleeve. After the medium contacts the bottom of the piezoresistive transmission body, it is tested by the piezoresistive transmission body. After the test is completed, the piezoresistive transmission body is moved downward to squeeze the medium in the protective sleeve into the pipeline or container through the docking pipe through the sealing piston, and then the baffle is pushed and the piezoresistive transmission body is released at the same time. After the piezoresistive transmission body is released, the compression spring pushes it upward and resets it, and the baffle is inserted into the protective sleeve to block the medium again. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the protective sleeve of the utility model;

[0019] Figure 3 This is a schematic diagram of the baffle structure of the utility model;

[0020] In the figure: 1. Protective sleeve; 2. Piezoresistive transmission body; 3. Plate sleeve; 4. Baffle; 5. Sealing piston; 6. Compression spring; 7. Limiting slide groove; 8. Limiting strip; 9. Exhaust hole; 10. Protective net; 11. Butt pipe; 12. Filter net; 13. Sealing gasket; 14. Sealing strip; 15. Anti-slip groove; 16. Limiting block; 17. Reserved groove. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] It has a telescopic structure, which moves downward for testing and moves upward after the test is completed, so as to avoid the U-shaped elastic tube in the resistance pressure transmitter from contacting the medium for a long time. Figure 1-3 As shown, a piezoresistive pressure transmitter described in the utility model comprises a protective sleeve 1, a plate sleeve 3 is welded on one side of the protective sleeve 1, a baffle 4 is provided through the plate sleeve 3, a sealing piston 5 is provided inside the protective sleeve 1, and a compression spring 6 is clamped and fixed between the sealing piston 5 and the protective sleeve 1;

[0023] The top of the protection sleeve 1 is sleeved with a piezoresistive transmission body 2, and the bottom end of the piezoresistive transmission body 2 penetrates the inside of the sealing piston 5 through a threaded groove. The inside of the protection sleeve 1 is fixedly engaged with a filter screen 12 through a slot.

[0024] When in use, the baffle 4 is inserted into the protective sleeve 1 from the plate sleeve 3 to block the medium so that the medium does not contact the piezoresistive transmission body 2 . The filter 12 can filter the medium entering the protective sleeve 1 to prevent impurities from entering the protective sleeve 1 .

[0025] For example, Figure 2 As shown, the utility model also includes that limiting strips 8 are welded at both ends of the inner side of the protective sleeve 1 , and limiting grooves 7 are provided on both sides of the sealing piston 5 , and the limiting grooves 7 are located outside the limiting strips 8 .

[0026] When in use, the limiting sliding groove 7 and the limiting strip 8 can limit the sealing piston 5 to prevent the sealing piston 5 from rotating.

[0027] For example, Figure 2 As shown, the utility model also includes that exhaust holes 9 are equidistantly opened through the top of the protective sleeve 1 , and a protective net 10 is arranged inside the exhaust hole 9 .

[0028] When in use, the exhaust hole 9 is opened for ventilation, and the protective net 10 can prevent dust and the like from entering the protective sleeve 1 through the exhaust hole 9 .

[0029] For example, Figure 2 , Figure 3 As shown, the utility model further includes that a sealing gasket 13 is glued to the inner side of the plate sleeve 3 , and a sealing strip 14 is glued to the outer side of the baffle 4 .

[0030] When in use, the sealing gasket 13 and the sealing strip 14 are sealed between the plate sleeve 3 and the baffle 4 to avoid leakage.

[0031] For example, Figure 3 As shown, the utility model further includes: limiting blocks 16 are welded on both sides of the baffle plate 4; an anti-slip groove 15 is opened at one end of the baffle plate 4; and a reserved groove 17 is opened at the other end of the baffle plate 4.

[0032] When in use, the anti-slip groove 15 is provided to facilitate personnel to hold and pull out the baffle 4 , and the reserved groove 17 is provided so that the limiting strip 8 can affect the sealing of the baffle 4 on the inside of the protective sleeve 1 .

[0033] For example, Figure 1 As shown, the utility model also includes that a butt-joint pipe 11 is welded to the bottom of the protective sleeve 1 .

[0034] When in use, the arrangement of the butt joint 11 facilitates the fixing of the protective sleeve 1 on a pipeline or a container.

[0035] When the utility model is used, a person uses a butt joint 11 to install the protective sleeve 1 on a pipeline or a container containing a medium, and uses a power cord to connect the device to an external power source;

[0036] The medium in the pipeline or container flows into the protective sleeve 1 through the butt joint 11 and is filtered by the filter 12 to prevent impurities in the medium from entering the protective sleeve 1. The baffle 4 is inserted into the protective sleeve 1 from the plate sleeve 3 to block the medium so that the medium does not enter the protective sleeve 1 and avoid contact with the bottom of the piezoresistive transmission body 2.

[0037] When detection is required, the baffle 4 is pulled to move one end of it from the protective sleeve 1 to the plate sleeve 3, and the medium in the pipeline or container flows into the protective sleeve 1. After the medium contacts the bottom of the piezoresistive transmission body 2, it is detected by the piezoresistive transmission body 2. After the detection is completed, the piezoresistive transmission body 2 is moved downward to squeeze the medium in the protective sleeve 1 into the pipeline or container through the sealing piston 5 through the docking pipe 11, and then the baffle 4 is pushed and the piezoresistive transmission body 2 is released at the same time. After the piezoresistive transmission body 2 is released, the compression spring 6 pushes it to move up and reset, and the baffle 4 is inserted into the protective sleeve 1 to block the medium again;

[0038] The setting of the limit strip 8 and the limit slide groove 7 can limit the sealing piston 5 without affecting its up and down movement to prevent it from rotating. The opening of the exhaust hole 9 allows the gas in the protective sleeve 1 to be discharged when the sealing piston 5 moves up and down. The sealing gasket 13 and the sealing strip 14 are used to seal between the plate sleeve 3 and the baffle 4.

[0039] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A piezoresistive pressure transmitter, characterized in that: The protective sleeve (1) comprises a plate sleeve (3) welded to one side of the protective sleeve (1), a baffle (4) is provided through the plate sleeve (3), a sealing piston (5) is provided inside the protective sleeve (1), and a compression spring (6) is clamped and fixed between the sealing piston (5) and the protective sleeve (1); The top of the protective sleeve (1) is sleeved with a piezoresistive transmission body (2), the bottom end of the piezoresistive transmission body (2) penetrates the interior of the sealing piston (5) via a threaded groove, and a filter screen (12) is fixedly engaged with the interior of the protective sleeve (1) via a slot.

2. A piezoresistive pressure transmitter according to claim 1, characterized in that: Limiting strips (8) are welded to the two ends of the inner side of the protective sleeve (1), and limiting sliding grooves (7) are provided on both sides of the sealing piston (5), and the limiting sliding grooves (7) are located outside the limiting strips (8).

3. The piezoresistive pressure transmitter according to claim 1, characterized in that: The top of the protective sleeve (1) is provided with exhaust holes (9) at equal intervals, and a protective net (10) is arranged inside the exhaust hole (9).

4. The piezoresistive pressure transmitter according to claim 1, characterized in that: A sealing gasket (13) is glued to the inner side of the plate sleeve (3), and a sealing strip (14) is glued to the outer side of the baffle (4).

5. The piezoresistive pressure transmitter according to claim 1, characterized in that: Limiting blocks (16) are welded on both sides of the baffle (4), an anti-slip groove (15) is provided at one end of the baffle (4), and a reserved groove (17) is provided at the other end of the baffle (4).

6. The piezoresistive pressure transmitter according to claim 1, characterized in that: A butt joint pipe (11) is welded to the bottom of the protective sleeve (1).

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