Integrated double-cavity differential pressure sensor

Abstract

The utility model discloses an integrated double-cavity differential pressure sensor, relates to the technical field of tail gas monitoring, and aims to solve the technical problems that two pressure diaphragms are both damaged and the maintenance cost is increased due to the fact that most of the current differential pressure sensors are independent cavities and are easy to block and water enters the cavities in the using process. Comprising a sensor body and an interface constructed at one end of the sensor body, an inner cavity is formed in the sensor body, a partition plate is arranged in the middle of the inner cavity, a sealing plate used for sealing the inner cavity is constructed at the end, extending out of the inner cavity, of the partition plate, and the inner cavity is divided into two detection cavities through the partition plate; the bottom end of the sensor main body is symmetrically provided with two detection ports which are respectively communicated with the corresponding detection cavities, and the detection ports are internally provided with pressure detection mechanisms. According to the utility model, a double-cavity detection mode is adopted, so that the problem that internal equipment is completely damaged due to water inflow can be avoided, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas monitoring, and more specifically to an integrated double-cavity pressure difference sensor. Background Art

[0002] A differential pressure sensor is a sensor used to measure the difference between two pressures. It is usually used to measure the pressure difference between the front and rear ends of a device or component.

[0003] At present, in order to detect the pressure difference at both ends of the diesel particulate filter, the diesel particulate filter in the automobile exhaust pipe is often equipped with a pressure difference sensor, which can judge whether the diesel particulate filter is blocked by the size of the pressure difference at both ends.

[0004] However, the differential pressure sensors in the prior art are mostly independent chambers, and the pressure at both ends of the diesel particulate filter is detected by the pressure diaphragm arranged at the air inlet of the cavity to obtain the pressure difference. However, since the diesel particulate filter is prone to water ingress during use, the independent chamber equipped with two pressure diaphragms is prone to damage to both pressure diaphragms after water ingress, which increases the cost of maintenance. In view of this, we propose an integrated dual-cavity differential pressure sensor. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art, meet actual needs, and provide an integrated dual-cavity pressure differential sensor to solve the technical problem that current pressure differential sensors are mostly independent chambers, which are prone to blockage and water ingress during use, resulting in damage to both pressure diaphragms and increased maintenance costs.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: an integrated dual-cavity differential pressure sensor, comprising a sensor body and an interface constructed at one end of the sensor body;

[0007] An inner cavity is formed in the sensor body, and a partition is centrally arranged in the inner cavity, and a sealing plate for sealing the inner cavity is configured at one end of the partition extending out of the inner cavity;

[0008] The inner cavity is divided into two detection cavities by a partition, and the bottom end of the sensor body is symmetrically provided with two detection ports respectively connected to the corresponding detection cavities, and the inner threads of the detection ports are matched with pressure detection mechanisms.

[0009] The utility model forms two detection chambers by using a partition to separate the inner cavity, and cooperates with two independent pressure detection mechanisms to detect the pressure acting on both ends of the diesel particulate filter, and then transmits the data to the external equipment through the interface for calculation, so as to obtain the pressure difference at both ends of the diesel particulate filter, avoid the problem of complete damage to the internal equipment due to water ingress, and reduce the cost of maintenance.

[0010] Preferably, the pressure detection mechanism comprises a connecting end and a pressure diaphragm, the connecting end is threadedly mounted in the detection port, and a limiting ring abutting against the sensor body is fixedly mounted on the outer edge surface of the connecting end.

[0011] Preferably, an installation cavity is provided at one end of the connection end extending into the detection cavity, and the pressure diaphragm is installed in the installation cavity.

[0012] Preferably, a plurality of positioning keys are arranged in an annular array on the outer edge surface of the pressure diaphragm, and a plurality of positioning grooves for corresponding insertion of the positioning keys are arranged in an annular array on the inner edge surface of the installation cavity.

[0013] Preferably, guide grooves are centrally provided at the top and bottom of the inner cavity, and the partition is inserted into the two guide grooves.

[0014] Preferably, both ends of the sealing plate are centrally constructed with extension ears, and one end of the sensor body is symmetrically provided with two fixing grooves for the corresponding extension ears to be inserted, and the extension ears are movably provided with fixing screws threadedly connected to the sensor body.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model forms two detection chambers by using a partition to separate the inner cavity, and cooperates with two independent pressure detection mechanisms to detect the pressure acting on both ends of the diesel particulate filter, and then transmits data to external equipment through an interface for calculation, and obtains the pressure difference at both ends of the diesel particulate filter, thereby avoiding the problem of complete damage to internal equipment due to water ingress, and reducing the cost of maintenance.

[0017] 2. The utility model also separates the inner cavity by means of a partition plate constructed on one side of the sealing plate. During maintenance, the fixing screws in the two extension ears are unscrewed to release the fixing arrangement of the sealing plate and the inner cavity, and the partition plate is pulled out, so that the inner cavity can be cleaned and maintained, and the two pressure detection mechanisms arranged in the detection port can be unscrewed for maintenance, which facilitates maintenance and further reduces the cost of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the utility model being installed on a diesel particulate filter in use;

[0019] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the internal structure of the utility model in a disassembled state;

[0021] Figure 4 It is a schematic diagram of the structure of the utility model in a cross-sectional state;

[0022] Figure 5 It is a schematic structural diagram of the pressure detection mechanism in the utility model in a disassembled state.

[0023] Description of the numbers in the figure:

[0024] 1. Sensor body; 101. Inner cavity; 102. Detection cavity; 2. Interface; 3. Partition; 301. Guide groove; 4. Pressure detection mechanism; 401. Connection end; 402. Pressure diaphragm; 403. Installation cavity; 404. Positioning key; 405. Positioning groove; 406. Limiting ring; 5. Sealing plate; 6. Extension ear; 601. Fixing groove. DETAILED DESCRIPTION

[0025] like Figure 1 , Figure 2 As shown, the utility model relates to an integrated dual-cavity differential pressure sensor, comprising a sensor body 1 and an interface 2 constructed at one end of the sensor body 1;

[0026] like Figure 2 , Figure 3 , Figure 4 As shown, in the embodiment of the utility model, in order to avoid the problem of complete damage of internal equipment due to water ingress, an inner cavity 101 is opened in the sensor body 1, and a partition 3 is centrally arranged in the inner cavity 101, and one end of the partition 3 extending out of the inner cavity 101 is constructed with a sealing plate 5 for sealing the inner cavity 101, and the inner cavity 101 is divided by the partition 3 to form two detection cavities 102, and the bottom end of the sensor body 1 is symmetrically provided with two detection ports respectively connected to the corresponding detection cavities 102, and the inner threads of the detection ports are matched with the pressure detection mechanism 4. The two detection cavities 102 are formed by separating the inner cavity 101 with the partition 3, and the pressure acting on the two ends of the diesel particulate filter is detected by cooperating with the two independent pressure detection mechanisms 4, and then the data is transmitted to the external device through the interface 2 for calculation, and the pressure difference at the two ends of the diesel particulate filter is obtained, and the problem of complete damage of the internal equipment due to water ingress is avoided, thereby reducing the cost of maintenance.

[0027] like Figure 4, Figure 5 As shown, in an embodiment of the utility model, in order to facilitate replacement during subsequent maintenance, the pressure detection mechanism 4 includes a connecting end 401 and a pressure diaphragm 402, the connecting end 401 is threadedly installed in the detection port, and a limiting ring 406 abutting against the sensor body 1 is fixedly installed on the outer edge surface of the connecting end 401, and an installation cavity 403 is provided at one end of the connecting end 401 extending into the detection cavity 102, and the pressure diaphragm 402 is installed in the installation cavity 403, and a plurality of positioning keys 404 are constructed in an annular array on the outer edge surface of the pressure diaphragm 402, and a plurality of positioning grooves 405 corresponding to the positioning keys 404 are provided on the inner edge surface of the installation cavity 403 in an annular array. The pressure diaphragm 402 is fixedly set in the connecting end 401 by the plurality of positioning keys 404 on the pressure diaphragm 402, which is convenient for replacement during subsequent maintenance and reduces the maintenance cost.

[0028] like Figure 2 , Figure 3 As shown, in the embodiment of the utility model, in order to further reduce the cost of maintenance, a guide groove 301 is centrally provided at the top and bottom of the inner cavity 101, and the partition 3 is inserted into the two guide grooves 301, and extension ears 6 are centrally constructed at both ends of the sealing plate 5, and two fixing grooves 601 corresponding to the extension ears 6 are symmetrically provided at one end of the sensor body 1, and a fixing screw threadedly connected to the sensor body 1 is movably provided in the extension ear 6, and the inner cavity 101 is separated by the partition 3 constructed on one side of the sealing plate 5. During maintenance, the fixing screws in the two extension ears 6 are unscrewed to release the fixing arrangement of the sealing plate 5 and the inner cavity 101, and the partition 3 is pulled out, so that the inner cavity 101 can be cleaned and maintained, and the two pressure detection mechanisms 4 arranged in the detection port are unscrewed for maintenance, which is convenient for maintenance and further reduces the cost of maintenance.

[0029] Working principle: This embodiment provides an integrated dual-cavity pressure difference sensor. When in use, by inserting the connector of the external device into the interface 2, and then connecting the detection tubes connected to the two ends of the diesel particulate filter to the two connection ends 401 respectively, the pressure at both ends of the diesel particulate filter can be collected through the two pressure diaphragms 402, and the pressure difference is calculated through the external device. Since a dual-chamber design is adopted, the two detection cavities 102 are not connected to each other. When water enters a single detection cavity 102, damage to the pressure detection mechanism 4 in the other detection cavity 102 is avoided. During maintenance, the fixing screws in the two extension ears 6 are unscrewed to release the fixing setting of the sealing plate 5 and the inner cavity 101, and the partition 3 is pulled out, so that the inner cavity 101 can be cleaned and maintained, and the two pressure detection mechanisms 4 arranged in the detection port can be unscrewed for maintenance, which is convenient for maintenance and reduces maintenance costs.

[0030] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. An integrated dual-cavity differential pressure sensor, characterized in that: It comprises a sensor body (1) and an interface (2) constructed at one end of the sensor body (1); An inner cavity (101) is provided in the sensor body (1), and a partition (3) is centrally arranged in the inner cavity (101); one end of the partition (3) extending out of the inner cavity (101) is provided with a sealing plate (5) for sealing the inner cavity (101); The inner cavity (101) is divided by a partition (3) to form two detection cavities (102), and the bottom end of the sensor body (1) is symmetrically provided with two detection ports respectively connected to the corresponding detection cavities (102), and the inner threads of the detection ports are matched with the pressure detection mechanism (4).

2. The integrated dual-cavity pressure differential sensor according to claim 1, characterized in that: The pressure detection mechanism (4) comprises a connection end (401) and a pressure diaphragm (402); the connection end (401) is threadedly mounted in the detection port, and a limiting ring (406) abutting against the sensor body (1) is fixedly mounted on the outer edge surface of the connection end (401).

3. The integrated dual-cavity pressure differential sensor according to claim 2, characterized in that: An installation cavity (403) is provided at one end of the connection end (401) extending into the detection cavity (102), and the pressure diaphragm (402) is installed in the installation cavity (403).

4. The integrated dual-cavity pressure difference sensor according to claim 3, characterized in that: A plurality of positioning keys (404) are arranged in an annular array on the outer edge surface of the pressure diaphragm (402), and a plurality of positioning grooves (405) for corresponding insertion of the positioning keys (404) are arranged in an annular array on the inner edge surface of the installation cavity (403).

5. The integrated dual-cavity differential pressure sensor according to claim 1, characterized in that: A guide groove (301) is centrally provided at the top and the bottom of the inner cavity (101), and the partition plate (3) is inserted into the two guide grooves (301).

6. The integrated dual-cavity differential pressure sensor according to claim 1, characterized in that: Both ends of the sealing plate (5) are centrally constructed with extension ears (6), and one end of the sensor body (1) is symmetrically provided with two fixing grooves (601) for corresponding insertion of the extension ears (6), and a fixing screw threadedly connected to the sensor body (1) is movably arranged in the extension ear (6).

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