A differential pressure sensor

Abstract

The present invention relates to a differential pressure sensor, which comprises: a detection chamber, a circuit board is arranged in the detection chamber, a first differential pressure sensing unit and a second differential pressure sensing unit are arranged on both sides of the circuit board, the detection chamber comprises a first chamber and a second chamber, the first chamber and the second chamber are arranged on both sides of the circuit board, the first differential pressure sensing unit is located in the first chamber and is used to detect the pressure difference between the first chamber and the second chamber, the second differential pressure sensing unit is located in the second chamber and is used to detect the pressure difference between the second chamber and the first chamber; a connector, a pin is arranged in the connector, and the pin is connected to the circuit board for signal. Since the first differential pressure sensing unit and the second differential pressure sensing unit are arranged to detect the pressure difference between the first chamber and the second chamber respectively, the difference between the two can be compared, and the failure of the first differential pressure sensing unit or the second differential pressure sensing unit can be discovered in time to avoid serious losses and harms caused thereby.

Description

Technical Field

[0001] The invention relates to a differential pressure sensor. Background Art

[0002] Most of the current differential pressure sensors use a single differential pressure sensing unit, which can only determine the differential pressure of the two-end pipelines at the same time, and cannot measure the single-end pipeline alone. At the same time, when the pressure of the single sensing unit production line drifts or fails seriously, it cannot be detected or discovered in time, which often brings huge risks and direct harm to the relevant systems. In addition, the deterioration of the current differential pressure sensor in the gas path structure and the shell sealing structure during the service life is easy to cause the product accuracy to shift and cause a high failure rate. Summary of the invention

[0003] The purpose of the present invention is to provide a differential pressure sensor to make the product safer.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The present invention provides a differential pressure sensor, which comprises:

[0006] A detection cavity, wherein a circuit board is disposed in the detection cavity, and a first pressure difference sensing unit and a second pressure difference sensing unit are respectively disposed on both side surfaces of the circuit board, the detection cavity comprises a first chamber and a second chamber, the first chamber and the second chamber are respectively disposed on both sides of the circuit board, the first pressure difference sensing unit is located in the first chamber and is used to detect the pressure difference between the first chamber and the second chamber, and the second pressure difference sensing unit is located in the second chamber and is used to detect the pressure difference between the second chamber and the first chamber;

[0007] A connector is provided with pins, and the pins are signal-connected to the circuit board.

[0008] Preferably, the pin has an inserting portion and a connecting portion, and a stop portion is bent between the inserting portion and the connecting portion. It also includes a stop buckle, and the stop buckle has a stop rod and a barb connected to the stop rod. The stop rod is located at the stop portion to limit the pin from moving toward the stop rod.

[0009] Furthermore, two barbs are provided, and the barbs are distributed on both sides of the pin.

[0010] Furthermore, the pins are substantially in a bar shape.

[0011] Furthermore, the stop portion matches the shape of the relative surface of the blocking rod.

[0012] Furthermore, the pins are arranged in parallel in a plurality, and the blocking rod is simultaneously located at the stop portions of the plurality of pins.

[0013] Furthermore, it also includes:

[0014] A receiving head is provided with a socket, the pin is located in the socket, and the barb is combined with a corresponding position of the receiving head.

[0015] Furthermore, an embedding groove is provided in the receiving head, and at least a part of the retaining buckle is located in the embedding groove.

[0016] Furthermore, a receiving cavity is provided in the receiving head, the receiving cavity has a receiving opening facing outwards, and the plug-in portion is located in the receiving cavity.

[0017] Furthermore, a stop hook is arranged on the receiving head.

[0018] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0019] The differential pressure sensor of the present invention is provided with a first differential pressure sensing unit and a second differential pressure sensing unit, which respectively detect the pressure difference between the first chamber and the second chamber. Therefore, the difference between the two can be compared, and the failure of the first differential pressure sensing unit or the second differential pressure sensing unit can be discovered in time to avoid serious losses and hazards caused thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0021] Figure 1 is a three-dimensional schematic diagram of a differential pressure sensor according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 a cross-sectional view of;

[0023] Figure 3 yes Figure 2 Enlarged view of the middle right part;

[0024] Figure 4 It is a three-dimensional schematic diagram of the pin and the retaining buckle;

[0025] Figure 5 yes Figure 4 Enlarged view of the center pin and the backstop;

[0026] Figure 6 yes Figure 1 a cross-sectional view of;

[0027] The reference numerals are described as follows:

[0028] 1. Pin; 11. Plug-in portion; 12. Connecting portion; 13. Stop portion;

[0029] 2. Stop buckle; 21. Stop rod; 22. Barb; 23. Extension rod;

[0030] 3. Receiving head; 31. Insertion hole; 32. Embedding groove; 33. Receiving cavity; 331. Receiving port; 34. Stop hook; 35. Accommodating hole;

[0031] 4. Circuit board;

[0032] 5. Detection chamber; 51. First chamber; 52. Second chamber;

[0033] 6. The first differential pressure sensing unit;

[0034] 7. Second differential pressure sensing unit;

[0035] 8. Cover plate; 81. Ribs;

[0036] 9. The first probe;

[0037] 10. The second probe. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figure 1The differential pressure sensor shown has a left end portion divided into a differential pressure detection portion, and a right end portion divided into a connector, and terminals are arranged in the connector.

[0042] The pressure difference detection part is provided with a first probe 9 and a second probe 10, which are respectively used to detect two detection points to detect the pressure difference between the two detection points.

[0043] like Figure 2 , Figure 3 as well as Figure 4 The pressure difference detection part includes a detection chamber 5, in which a circuit board 4 is arranged, and the circuit board 4 divides the detection chamber 5 into a first chamber 51 and a second chamber 52. The aforementioned first probe 9 and the second probe 10 are respectively connected to the first chamber 51 and the second chamber 52. The first pressure difference sensing unit 6 and the second pressure difference sensing unit 7 are respectively arranged on both sides of the circuit board 4.

[0044] The first pressure difference sensing unit 6 is disposed in the first chamber 51 . A hole is formed in the portion of the circuit board 4 corresponding to the first pressure difference sensing unit 6 , so that the first pressure difference sensing unit 6 can detect the pressure difference between the first chamber 51 and the second chamber 52 .

[0045] The second pressure difference sensing unit 7 is disposed in the second chamber 52 . A hole is formed in the portion of the circuit board 4 corresponding to the second pressure difference sensing unit 7 , so that the second pressure difference sensing unit 7 can detect the pressure difference between the second chamber 52 and the first chamber 51 .

[0046] The first pressure difference sensing unit 6 and the second pressure difference sensing unit 7 are disposed in the first chamber 51 and the second chamber 52, respectively, so that the entire device is compact.

[0047] The first pressure difference sensing unit 6 and the second pressure difference sensing unit 7 detect the pressure difference separately, so that the difference between the two can be compared, and the failure of the first pressure difference sensing unit 6 or the second pressure difference sensing unit 7 can be discovered in time to avoid serious losses and harms caused thereby.

[0048] like Figure 2 The first chamber 51 is covered with a cover plate 8. Ribs 81 extend from the cover plate 8, and the ribs 81 press against the circuit board 4, thereby stabilizing the circuit board 4.

[0049] like Figure 2 , Figure 3 as well as Figure 4 The connector includes a pin 1, a retaining buckle 2 (see Figure 4 ) and receiving header 3.

[0050] There are multiple pins 1, depending on the signal to be output on the circuit board 4. The pins 1 are arranged side by side. Figure 5The pin 1 is roughly "Z" shaped, and has a plug-in portion 11, a connecting portion 12, and a stopper portion 13. The plug-in portion 11 is used to plug with an external cable head, and the connecting portion 12 is used to connect with the circuit board 4 inside the differential pressure sensor. The stopper portion 13 is formed by bending between the plug-in portion 11 and the connecting portion 12, and is used to be restricted by the stopper buckle 2. The pin 1 is roughly bar-shaped, without a complex and bulky structure, so that the connector structure is light.

[0051] The receiving head 3 is provided with a socket 31 (such as Figure 3 ), the pin 1 is inserted into the jack 31, and the pin 1 and the receiving head 3 are filled with sealant, specifically, the sealant is filled in the jack 31 and sealed by the sealant. The receiving head 3 has a receiving cavity 33, the aforementioned plug-in portion 11 is located in the receiving cavity 33, the receiving cavity 33 has a receiving port 331 facing the outside, and the receiving head 3 is used to dock with an external cable head. In order to prevent the cable head from loosening after docking, a stop hook 34 is also provided on the receiving head 3.

[0052] When the pin 1 is inserted into the jack 31, a stop buckle 2 is provided to prevent the pin 1 from falling back. Figure 5 The stop buckle 2 has a stop rod 21 and a barb 22. The barb 22 is connected to the stop rod 21 through an extension rod 23. The stop rod 21 is located at the stop portion 13 of the pin 1 to limit the pin 1 from moving in the direction of the stop rod 21, that is, to limit the pin 1 from retreating and coming out. The stop rod 21 is located at the stop portions 13 of multiple pins 1 at the same time, so that multiple pins 1 can be blocked at the same time. The stop portion 13 matches the relative surface shape of the stop rod 21, so as to achieve a better fit. Figure 3 A groove 32 is provided in the receiving head 3 , and at least a portion of the retaining buckle 2 is located in the groove 32 , so as to better accommodate the retaining buckle 2 . In this example, mainly the blocking rod 21 is located in the groove 32 .

[0053] The barb 22 is coupled to a corresponding portion of the receiving head 3 (see Figure 3 ), realize the stop of the stop buckle 2 itself. Figure 6 , a receiving hole 35 is provided in the receiving head 3, the extension rod 23 is located in the receiving hole 35, the barb 22 is combined with the inner end surface of the receiving hole 35, and the barb 22 is stopped. The inner diameter of the receiving hole 35 is slightly larger than the outer diameter of the extension rod 23, so that the extension rod 23 can be bent to a certain extent in the receiving hole 35, so as to insert the barb 22 and the extension rod 23 into the receiving hole 35 from right to left. During the insertion process, the extension rod 23 is squeezed by the inner wall of the receiving hole 35 and is elastically bent to a small extent. After reaching the predetermined position (that is, when the barb 22 just completely emerges from the receiving hole 35), the extension rod 23 rebounds, and the barb 22 is buckled on the inner end surface of the receiving hole 35 to stop retreating.

[0054] In this example, the root of the extension rod 23 (the part where the extension rod 23 is connected to the blocking rod 21) is reinforced, that is, the root of the extension rod 23 is thicker than other adjacent parts, so that the extension rod 23 is not easily broken when bent.

[0055] In this example, two barbs 22 are provided, distributed on both sides of the pin 1, so as to fix the pin 1 more stably. Figure 5 The setting of the extension rod 23 makes the barb 22 more inclined to the inner end of the pin 1, thereby reducing the shaking of the blocking rod 21 and further reducing the shaking of the pin 1.

[0056] In the prior art, the pin 1 is usually fixed in the receiving head 3 by injection molding, rather than by insertion as in this example. The injection molding method has a disadvantage that due to thermal expansion and contraction, a gap is formed between the pin 1 and the receiving head 3 of different materials, resulting in looseness or air leakage.

[0057] In summary, the differential pressure sensor of this example measures the pressure difference between the first chamber 51 and the second chamber 52 separately through the first differential pressure sensing unit 6 and the second differential pressure sensing unit 7, so that the difference between the two can be compared, and the failure of the first differential pressure sensing unit or the second differential pressure sensing unit can be discovered in time to avoid serious losses and harm caused by it. In addition, the pin 1 is installed in the receiving head 3 in an inserted manner, sealed by a sealant, and the pin 1 is prevented from retreating by the stop buckle 2, which is easy to install and stable in operation.

[0058] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A differential pressure sensor, characterized in that it include: A detection chamber (5), wherein a circuit board (4) is arranged in the detection chamber (5), and a first pressure difference sensing unit (6) and a second pressure difference sensing unit (7) are respectively arranged on two side surfaces of the circuit board (4), wherein the detection chamber (5) comprises a first chamber (51) and a second chamber (52), wherein the first chamber (51) and the second chamber (52) are respectively arranged on two sides of the circuit board (4), wherein the first pressure difference sensing unit (6) is located in the first chamber (51) and is used to detect the pressure difference between the first chamber (51) and the second chamber (52), and wherein the second pressure difference sensing unit (7) is located in the second chamber (52) and is used to detect the pressure difference between the second chamber (52) and the first chamber (51); A connector, wherein a pin (1) is provided in the connector, and the pin (1) is signal-connected to the circuit board (4); A receiving head (3), wherein a socket (31) is provided in the receiving head (3), and the pin (1) is located in the socket (31); The pin (1) comprises an inserting portion (11) and a connecting portion (12), wherein a stop portion (13) is bent between the inserting portion (11) and the connecting portion (12), and further comprises a stop buckle (2), wherein the stop buckle (2) comprises a stop rod (21) and a barb (22) connected to the stop rod (21), wherein the stop rod (21) is located at the stop portion (13) to limit the pin (1) from moving toward the stop rod (21), and the barb (22) is coupled to a corresponding portion of the receiving head (3); The receiving head (3) is provided with an embedding groove (32), and at least a portion of the retaining buckle (2) is located in the embedding groove (32).

2. The differential pressure sensor according to claim 1, characterized in that: Two barbs (22) are provided, and the barbs (22) are distributed on both sides of the pin (1).

3. The differential pressure sensor according to claim 1, characterized in that: The pin (1) is roughly in the shape of a bar.

4. The differential pressure sensor according to claim 1, characterized in that: The stop portion (13) matches the relative surface shape of the blocking rod (21).

5. The differential pressure sensor according to claim 1, characterized in that: The pins (1) are arranged in parallel in a plurality, and the blocking rod (21) is simultaneously located at the stop portions (13) of the plurality of pins (1).

6. The differential pressure sensor according to claim 1, characterized in that: A receiving cavity (33) is provided in the receiving head (3), the receiving cavity (33) having a receiving opening (331) facing outwards, and the plug-in portion (11) is located in the receiving cavity (33).

7. The differential pressure sensor according to claim 1, characterized in that: The receiving head (3) is provided with a stop hook (34).

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