Anti-freezing pressure sensor

Abstract

The invention provides an anti-freezing pressure sensor which comprises a shell, an elastic body, a flow guide block and a pressure sensing assembly, a containing cavity and a buffering cavity are formed in the shell, and a liquid inlet hole and a liquid outlet hole are formed in the side wall of the shell. The elastic body is arranged in the buffering cavity, the flow guide block is arranged in the containing cavity and provided with a liquid inlet flow channel, a liquid outlet flow channel and a pressure sensing flow channel, and the pressure sensing assembly is arranged on the top of the pressure sensing flow channel. The pressure sensing flow channel is arranged in the vertical direction, the deformable elastic body is arranged below the pressure sensing flow channel, when liquid in the pressure sensing flow channel crystallizes and expands, the elastic body can provide an expansion space for liquid freezing, and therefore the pressure sensing assembly is prevented from being damaged due to pressure. A unique zigzag flow channel structure is formed in the shell and the flow guide block, so that the shell and the flow guide block can absorb a part of internal stress generated during icing to provide buffering by utilizing the material of the shell and the flow guide block and the characteristics of the flow channel structure when liquid crystallizes and expands, and the pressure sensing assembly is prevented from being damaged due to excessive pressure borne by the pressure sensing assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure sensors, and in particular relates to an antifreeze type pressure sensor. Background Art

[0002] Pressure sensors can be used to detect the pressure of liquids (such as urea solutions) and are used in various types of mechanical equipment. In cold environments, there is a risk of freezing of the liquid in the internal flow channel of the pressure sensor. When the liquid freezes, it will expand and exert a certain amount of pressure on the sensing core, causing damage to the core. For example, in the automotive industry, in order to meet the requirements of emission regulations, commercial vehicles are equipped with urea injection systems. The urea injection system is a technology that reduces diesel engine emissions. Its principle is to quantitatively spray urea aqueous solution into the engine exhaust gas to reduce the content of nitrogen oxides in the exhaust gas and meet the prescribed emission standards.

[0003] The urea injection system is mainly composed of a controller, a urea pump, a urea tank, a nozzle and various sensors. The urea pressure sensor is one of the components of the urea injection system, which mainly monitors the pressure during the urea injection process in real time. In winter or colder areas, after the vehicle stops, there may be residual urea aqueous solution in the flow channel of the urea injection system due to various reasons. The urea aqueous solution will crystallize due to the low temperature. After the urea aqueous solution crystallizes, it expands, which will damage the urea pressure sensor core and cause the sensor to fail. Summary of the invention

[0004] The embodiment of the present invention provides an antifreeze type pressure sensor, which aims to solve the problem in the prior art that the solution in the pressure sensor expands after freezing in a cold environment, which may damage the core.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide an antifreeze pressure sensor, comprising: The housing has a receiving cavity, a liquid inlet hole and a liquid outlet hole, the bottom wall of the receiving cavity is provided with a buffer groove, and the liquid inlet hole and the liquid outlet hole are respectively connected to the receiving cavity; an elastic body, disposed in the buffer groove; a guide block, disposed in the accommodating cavity and located above the elastic body, the guide block having a liquid inlet channel, a liquid outlet channel and a pressure-sensitive channel, the pressure-sensitive channel runs through the thickness direction of the guide block, the liquid inlet channel is connected between the liquid inlet hole and the pressure-sensitive channel, and the liquid outlet channel is connected between the pressure-sensitive channel and the liquid outlet hole; and The pressure-sensing component is arranged in the accommodating cavity and is located above the guide block. The pressure-sensing end of the pressure-sensing component is located above the pressure-sensing flow channel.

[0006] In a possible implementation, the liquid inlet includes: a first hole segment, arranged in a horizontal direction, the first hole segment penetrating through one side of the housing, the first hole segment forming a liquid inlet end; and The second hole segment is arranged along the up-down direction, and the second hole segment is connected to the first hole segment and the pressure-sensitive flow channel.

[0007] In a possible implementation, the liquid outlet includes: a third hole segment, arranged in a horizontal direction, the third hole segment penetrating through one side of the shell, the third hole segment forming a liquid outlet; and The fourth hole segment is arranged along the up-down direction, and the fourth hole segment is connected to the third hole segment and the pressure-sensitive flow channel.

[0008] In a possible implementation, the liquid inlet flow channel and the liquid outlet flow channel are arranged relative to the pressure-sensitive flow channel, and the liquid inlet flow channel and the liquid outlet flow channel are both arranged to be inclined in an up-and-down direction.

[0009] In a possible implementation, the aperture of the liquid inlet channel gradually shrinks in the direction of liquid flow, and the aperture of the liquid outlet channel gradually expands in the direction of liquid flow.

[0010] In a possible implementation, the liquid inlet channel and the liquid outlet channel are respectively connected to the middle section of the pressure-sensitive channel, a baffle is provided in the pressure-sensitive channel, the baffle is arranged in the vertical direction, the baffle is arranged at the upper part of the pressure-sensitive channel, and extends downward to below the position where the liquid inlet channel and the liquid outlet channel are connected to the pressure-sensitive channel, and the liquid inlet channel and the liquid outlet channel are respectively arranged on both sides of the baffle.

[0011] In a possible implementation, the bottom wall of the accommodating cavity is provided with a first sealing groove, a second sealing groove and a third sealing groove, the first sealing groove is arranged around the buffer groove, the second sealing groove is arranged around the communication position between the liquid inlet hole and the liquid inlet channel, and the third sealing groove is arranged around the communication position between the liquid outlet channel and the liquid outlet hole; The antifreeze pressure sensor also includes a seal, which has a first sealing portion arranged in the first sealing groove, a second sealing portion arranged in the second sealing groove, and a third sealing portion arranged in the third sealing groove, the first sealing portion has folds, the guide block is arranged above the first sealing portion, and the elastomer is arranged below the first sealing portion; the first sealing portion is used to close the top opening of the buffer groove, and the second sealing portion and the third sealing portion are respectively used to seal the joint surface between the guide block and the bottom wall of the accommodating cavity.

[0012] In a possible implementation, the pressure sensing component includes: A pressure-sensitive core body is disposed in the accommodating cavity and located above the guide block, and the pressure-sensitive core body forms the pressure sensing end; and The circuit board is arranged in the accommodating cavity and is electrically connected to the pressure-sensitive core. The shell has a wiring terminal electrically connected to the circuit board.

[0013] In a possible implementation, the pressure-sensing component also includes a support plate, which is arranged above the pressure-sensing core, and the circuit board is arranged on the support plate. The side wall of the support plate is provided with a buckle, and the inner wall of the accommodating cavity is provided with a slot adapted to be snap-fitted with the buckle.

[0014] In a possible implementation, the top of the accommodating cavity is open, and the inner wall of the accommodating cavity is provided with an annular accommodating groove. The antifreeze pressure sensor also includes an upper cover, which is arranged at the opening of the accommodating cavity, and the side wall of the upper cover is accommodated in the accommodating groove, and the accommodating groove is provided with sealant.

[0015] Compared with the prior art, the antifreeze pressure sensor provided by the present invention has the following beneficial effects: The present invention provides an antifreeze pressure sensor including a shell, an elastomer, a guide block and a pressure-sensitive component. The shell has a accommodating chamber and a buffer chamber inside, and the side walls of the shell are respectively provided with a liquid inlet hole and a liquid outlet hole connected to the accommodating chamber. The elastomer is arranged in the buffer chamber, and the guide block is arranged in the accommodating chamber. The guide block has a liquid inlet channel connected to the liquid inlet hole, and a liquid outlet channel connected to the liquid outlet hole. A pressure-sensitive channel is also arranged between the liquid inlet hole and the liquid outlet hole, which vertically penetrates the guide block. The pressure sensing end of the pressure-sensitive component is arranged at the top of the pressure-sensitive channel. When working, liquid such as urea solution flows into the accommodating chamber from the liquid inlet hole of the shell, passes through the liquid inlet channel, the pressure-sensitive channel and the liquid outlet channel, and finally flows out from the liquid outlet hole. The pressure-sensitive component can measure the pressure of liquid such as urea solution.

[0016] In the present invention, the pressure-sensitive flow channel is arranged in the vertical direction, and a deformable elastic body is arranged below the pressure-sensitive flow channel. When the urea solution or other liquid in the pressure-sensitive flow channel crystallizes and expands, the elastic body can be deformed under pressure, providing expansion space for the urea solution or other liquid to freeze, thereby preventing the pressure-sensitive component from being damaged by pressure. When the urea solution or other liquid flows, it passes through the liquid inlet hole, the liquid inlet flow channel, the pressure-sensitive flow channel, the liquid outlet flow channel and the liquid outlet hole in sequence, forming a unique zigzag flow channel structure. The zigzag flow channel helps the shell and the guide block to absorb part of the internal stress generated when the urea solution or other liquid crystallizes and expands, using its own material and flow channel structure characteristics to provide buffering, thereby preventing the pressure-sensitive component from being damaged due to excessive pressure, and solving the problem in the prior art that the urea solution or other liquid in the urea pressure sensor expands after freezing, which may damage the pressure-sensitive core. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an antifreeze pressure sensor provided by one of the embodiments of the present invention; Figure 2 An internal cross-sectional view of an antifreeze pressure sensor provided by one embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged view of the middle A part; Figure 4 An explosion diagram of an antifreeze pressure sensor provided in one embodiment of the present invention.

[0018] Description of reference numerals: 10. Shell; 11. Liquid inlet hole; 111. First hole section; 112. Second hole section; 12. Liquid outlet hole; 121. Third hole section; 122. Fourth hole section; 13. Buffer slot; 14. Terminal; 20. Elastomer; 30. Guide block; 31. Liquid inlet channel; 32. Liquid outlet channel; 33. Pressure-sensitive channel; 34. Baffle; 40. Pressure-sensitive component; 41. Pressure-sensitive core; 42. Circuit board; 43. Support plate; 431. Buckle; 50. Sealing element; 51. First sealing portion; 52. Second sealing portion; 53. Third sealing portion; 60. Upper cover; 61. Sealant. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] It should be noted that when an element is referred to as being "fixed to", "fixed" or "fixedly disposed" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" or "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is referred to as being "set to" or "disposed on" another element, it may be directly on the other element or there may be a central element. "Multiple" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0021] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0022] Please also read Figures 1 to 4 , an antifreeze type pressure sensor provided in an embodiment of the present invention is described below.

[0023] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiment of the present invention provides an antifreeze type pressure sensor, comprising a housing 10, an elastic body 20, a guide block 30 and a pressure sensing component 40. The housing 10 has a containing cavity, a liquid inlet hole 11 and a liquid outlet hole 12. The bottom wall of the containing cavity is provided with a buffer groove 13. The liquid inlet hole 11 and the liquid outlet hole 12 are respectively connected to the containing cavity; the elastic body 20 is arranged in the buffer groove 13; the guide block 30 is arranged in the containing cavity and is located above the elastic body 20. The guide block 30 has a liquid inlet channel 31, a liquid outlet channel 32 and a pressure sensing channel 33. The pressure sensing channel 33 runs through the thickness direction of the guide block 30. The liquid inlet channel 31 is connected between the liquid inlet hole 11 and the pressure sensing channel 33. The liquid outlet channel 32 is connected between the pressure sensing channel 33 and the liquid outlet hole 12; the pressure sensing component 40 is arranged in the containing cavity and is located above the guide block 30. The pressure sensing end of the pressure sensing component 40 is located above the pressure sensing channel 33.

[0024] It should be noted that, in this embodiment, urea solution is taken as an example. In practical applications, the antifreeze pressure sensor provided by the present invention can also be used to detect the pressure of other liquids.

[0025] Compared with the prior art, the antifreeze pressure sensor provided by the embodiment of the present invention has the following beneficial effects: An antifreeze type pressure sensor provided by an embodiment of the present invention includes a housing 10, an elastic body 20, a guide block 30 and a pressure sensing component 40. The housing 10 has a receiving cavity and a buffer cavity inside. The side walls of the housing 10 are respectively provided with a liquid inlet hole 11 and a liquid outlet hole 12 connected to the receiving cavity. The elastic body 20 is arranged in the buffer cavity, and the guide block 30 is arranged in the receiving cavity. The guide block 30 has a liquid inlet channel 31 connected to the liquid inlet hole 11 and a liquid outlet channel 32 connected to the liquid outlet hole 12. A pressure sensing channel 33 vertically penetrating the guide block 30 is also arranged between the liquid inlet hole 11 and the liquid outlet hole 12. The pressure sensing end of the pressure sensing component 40 is arranged at the top of the pressure sensing channel 33. When working, the urea solution flows into the receiving cavity from the liquid inlet hole 11 of the housing 10, passes through the liquid inlet channel 31, the pressure sensing channel 33 and the liquid outlet channel 32, and finally flows out from the liquid outlet hole 12. The pressure sensing component 40 can measure the pressure of the urea solution.

[0026] In the embodiment of the present invention, the pressure-sensing flow channel 33 is arranged in the vertical direction, and a deformable elastic body 20 is arranged below the pressure-sensing flow channel 33. When the urea solution in the pressure-sensing flow channel 33 crystallizes and expands, the elastic body 20 can be deformed under pressure to provide an expansion space for the urea solution to freeze, thereby preventing the pressure-sensing component 40 from being damaged by pressure. When the urea solution flows, it passes through the liquid inlet hole 11, the liquid inlet flow channel 31, the pressure-sensing flow channel 33, the liquid outlet flow channel 32 and the liquid outlet hole 12 in sequence, forming a unique zigzag flow channel structure. The zigzag flow channel helps the housing 10 and the guide block 30 to absorb part of the internal stress generated when the urea solution crystallizes and expands by using its own material and flow channel structure characteristics to provide buffering, thereby preventing the pressure-sensing component 40 from being damaged by excessive pressure, and solving the problem that the urea solution in the urea pressure sensor in the prior art expands after freezing, which may damage the pressure-sensing core 41.

[0027] In the embodiment of the present invention, the housing 10 can be made of plastic, metal (such as iron, aluminum, copper) and other materials, and the housing 10 has a receiving cavity for installing components such as the guide block 30 and the pressure sensing component 40. The guide block 30, the pressure sensing component 40 and other components can be installed and fixed by means of clamping, screw connection, gluing and the like.

[0028] The housing 10 has a liquid inlet 11 and a liquid outlet 12, and the liquid inlet 11 and the liquid outlet 12 can be respectively arranged on both sides of the housing 10, that is, liquid enters one end of the housing 10 and liquid exits the other end. Both the liquid inlet 11 and the liquid outlet 12 are multi-section curved hole structures, so that when the internal urea solution crystallizes and expands, the internal stress generated during crystallization can act more on the side wall of the hole body. In this way, the material and flow channel structural characteristics of the housing 10 can be used to absorb part of the internal stress, thereby preventing the internal stress from acting on the pressure sensing component 40 along the flow channel to cause damage to the pressure sensing component 40.

[0029] The elastomer 20 can be made of a material that can undergo elastic deformation, such as rubber. The elastomer 20 is arranged at the bottom of the pressure-sensitive channel 33, and the pressure-sensitive component 40 is arranged at the top of the pressure-sensitive channel 33. When the urea solution in the pressure-sensitive channel 33 crystallizes and expands, the elastomer 20 is deformed by pressure, providing space for the urea solution to crystallize and expand, thereby protecting the pressure-sensitive component 40 from being damaged by excessive pressure.

[0030] The guide block 30 can be made of plastic, metal and other materials. The guide block 30 has a liquid inlet channel 31, a pressure-sensitive channel 33 and a liquid outlet channel 32. The upper part of the pressure-sensitive channel 33 is used for the pressure-sensitive component 40 to detect pressure, and the lower part of the pressure-sensitive channel 33 is used for energy absorption and buffering of the elastic body 20. The liquid inlet channel 31 and the liquid outlet channel 32 are arranged relative to the pressure-sensitive channel 33 in an eight-shaped shape, and can be arranged at a certain angle, such as 80°, 90°, and 100°.

[0031] The guide block 30 and the housing 10 may be formed in an integral structure or in a split structure. Elastic parts such as rubber blocks and springs may also be arranged inside the pressure-sensing flow channel 33 to further improve the pressure-reducing effect.

[0032] The pressure sensing component 40 is disposed in the accommodating cavity and is used to detect the liquid pressure. The pressure sensing component 40 can be directly selected from existing products on the market, and there is no restriction on its specific specifications and models.

[0033] See also Figure 2 and Figure 3 In some possible embodiments, the liquid inlet hole 11 includes a first hole segment 111 and a second hole segment 112. The first hole segment 111 is arranged in a horizontal direction, and the first hole segment 111 passes through one side of the shell 10, and the first hole segment 111 forms a liquid inlet end; the second hole segment 112 is arranged in an up and down direction, and the second hole segment 112 is connected to the first hole segment 111 and the pressure sensing channel 33.

[0034] In this embodiment, the liquid inlet hole 11 includes a first hole segment 111 and a second hole segment 112 that are cross-arranged, so as to form an internally tortuous liquid inlet hole 11, which helps to better absorb energy when the urea solution crystallizes and expands.

[0035] See also Figure 2 and Figure 3 In some possible embodiments, the liquid outlet 12 includes a third hole segment 121 and a fourth hole segment 122. The third hole segment 121 is arranged in the horizontal direction, and the third hole segment 121 passes through one side of the shell 10, and the third hole segment 121 forms a liquid outlet end; the fourth hole segment 122 is arranged in the up and down direction, and the fourth hole segment 122 is connected to the third hole segment 121 and the pressure sensing channel 33.

[0036] In this embodiment, the liquid outlet hole 12 includes a third hole segment 121 and a fourth hole segment 122 that are cross-arranged, which can form an internally tortuous liquid inlet hole 11, which helps to better absorb energy when the urea solution crystallizes and expands.

[0037] See also Figure 2 and Figure 3 In some possible embodiments, the liquid inlet channel 31 and the liquid outlet channel 32 are arranged relative to the pressure sensing channel 33, and the liquid inlet channel 31 and the liquid outlet channel 32 are arranged inclined in the up and down directions. The liquid inlet channel 31 and the liquid outlet channel 32 are arranged in an eight-shaped shape, which can better realize internal energy absorption, reduce the stress acting on the pressure sensing component 40 when the urea solution crystallizes and expands, and protect the pressure sensing component 40 from being damaged by pressure.

[0038] See also Figure 2 and Figure 3In some possible embodiments, the aperture of the liquid inlet channel 31 gradually shrinks in the direction of liquid flow, and the aperture of the liquid outlet channel 32 gradually expands in the direction of liquid flow, which can guide the internal stress to be transmitted away from the pressure-sensitive component 40 when the urea solution crystallizes and expands, thereby reducing the pressure on the pressure-sensitive component 40.

[0039] See also Figure 2 and Figure 3 In some possible embodiments, the liquid inlet channel 31 and the liquid outlet channel 32 are respectively connected to the middle position of the pressure-sensitive channel 33. A baffle 34 is provided in the pressure-sensitive channel 33. The baffle 34 is arranged in the vertical direction. The baffle 34 is arranged at the upper part of the pressure-sensitive channel 33 and extends downward to below the position where the liquid inlet channel 31 and the liquid outlet channel 32 are connected to the pressure-sensitive channel 33. The liquid inlet channel 31 and the liquid outlet channel 32 are respectively arranged on both sides of the baffle 34.

[0040] In this embodiment, a baffle 34 is provided in the pressure-sensitive flow channel 33. The baffle 34 is provided at the upper part of the pressure-sensitive flow channel 33. The arrangement of the baffle 34 can force the urea solution to flow along the pressure-sensitive flow channel 33. Figure 3 The flow path indicated by the arrow forces the urea solution to flow through the pressure sensing component 40 , thereby improving the pressure sensitivity of the pressure sensing component 40 (especially in a high-frequency changing liquid environment).

[0041] See also Figure 2 and Figure 4 In some possible embodiments, the bottom wall of the accommodating cavity is provided with a first sealing groove, a second sealing groove and a third sealing groove, the first sealing groove is arranged around the buffer groove 13, the second sealing groove is arranged around the connecting position between the liquid inlet hole 11 and the liquid inlet channel 31, and the third sealing groove is arranged around the connecting position between the liquid outlet channel 32 and the liquid outlet hole 12; an antifreeze type pressure sensor also includes a sealing member 50, the sealing member 50 has a first sealing portion 51 arranged in the first sealing groove, a second sealing portion 52 arranged in the second sealing groove, and a third sealing portion 53 arranged in the third sealing groove, the first sealing portion 51 has folds to ensure that the first sealing portion 51 has sufficient elastic deformation, and can provide sufficient buffer space for the expanded urea crystals when the urea solution freezes. The guide block 30 is arranged above the first sealing portion 51, and the elastic body 20 is arranged below the first sealing portion 51; the first sealing portion 51 is used to close the top opening of the buffer groove 13, and the second sealing portion 52 and the third sealing portion 53 are respectively used to seal the joint surface between the guide block 30 and the bottom wall of the accommodating cavity.

[0042] In this embodiment, the sealing member 50 is made of rubber material, and the first sealing portion 51, the second sealing portion 52 and the third sealing portion 53 are integrally formed, which can reduce the number of parts and assembly steps, and also simplify the assembly process. The first sealing portion 51 is used to close the opening of the buffer tank 13. The first sealing portion 51 is formed with multiple layers of folds in the horizontal direction. The first sealing portion 51 has sufficient elastic deformation. At the same time, the top of the elastic body 20 abuts against the lower surface of the first sealing portion 51, which can transmit force to the elastic body 20 when the urea solution freezes and expands.

[0043] See also Figure 2 and Figure 4 In some possible embodiments, the pressure-sensing component 40 includes a pressure-sensing core 41 and a circuit board 42. The pressure-sensing core 41 is disposed in the accommodating cavity and is located above the guide block 30. The pressure-sensing core 41 forms a pressure sensing end. The circuit board 42 is disposed in the accommodating cavity and is electrically connected to the pressure-sensing core 41. The housing 10 has a terminal 14 electrically connected to the circuit board 42. The terminal 14 has a metal electrode pin for connecting to a wiring harness.

[0044] See also Figure 2 and Figure 4 In some possible embodiments, the pressure-sensing component 40 also includes a support plate 43, which is disposed above the pressure-sensing core 41, and the circuit board 42 is disposed on the support plate 43. The side wall of the support plate 43 is provided with a buckle 431, and the inner wall of the accommodating cavity is provided with a slot that is adapted to be engaged with the buckle 431. The buckle 431 cooperates with the slot to achieve limited fixation of the support plate 43. After the support plate 43 is installed, it can press the pressure-sensing core 41 downward.

[0045] See also Figure 1 and Figure 4 In some possible embodiments, the top of the accommodating cavity is open, and the inner wall of the accommodating cavity is provided with an annular accommodating groove. An antifreeze type pressure sensor also includes an upper cover 60, which is arranged at the opening of the accommodating cavity, and the side wall of the upper cover 60 is accommodated in the accommodating groove, and a sealant 61 is provided in the accommodating groove.

[0046] In this embodiment, the upper part of the accommodating cavity is open. When assembling the product, the elastic body 20, the guide block 30, the pressure-sensitive core 41, the support plate 43, the circuit board 42 and other parts are installed in the accommodating cavity and fixed, and the upper cover 60 is covered, and the gap between the upper cover 60 and the housing 10 is sealed by the sealant 61. In addition, the upper cover 60 and the housing 10 can also be sealed by welding, setting a sealing ring and other methods.

[0047] It can be understood that the various parts in the above-mentioned embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the specification of the present invention has recorded various combination embodiments and can support different combination embodiments.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A freeze-resistant pressure sensor, characterized in that: include: A housing (10) having a containing cavity, a liquid inlet hole (11) and a liquid outlet hole (12); a buffer groove (13) is provided on the bottom wall of the containing cavity; the liquid inlet hole (11) and the liquid outlet hole (12) are respectively connected to the containing cavity; An elastic body (20) is arranged in the buffer groove (13); a guide block (30) disposed in the accommodating cavity and located above the elastic body (20); the guide block (30) having a liquid inlet channel (31), a liquid outlet channel (32) and a pressure-sensitive channel (33); the pressure-sensitive channel (33) runs through the guide block (30) in a thickness direction; the liquid inlet channel (31) is connected between the liquid inlet hole (11) and the pressure-sensitive channel (33); and the liquid outlet channel (32) is connected between the pressure-sensitive channel (33) and the liquid outlet hole (12); as well as The pressure sensing component (40) is arranged in the accommodating cavity and is located above the guide block (30); the pressure sensing end of the pressure sensing component (40) is located above the pressure sensing flow channel (33).

2. The antifreeze pressure sensor according to claim 1, characterized in that: The liquid inlet hole (11) comprises: a first hole section (111) arranged in a horizontal direction, the first hole section (111) passing through one side of the housing (10), the first hole section (111) forming a liquid inlet end; and The second hole segment (112) is arranged in the up-down direction, and the second hole segment (112) is connected to the first hole segment (111) and the pressure-sensitive flow channel (33).

3. The antifreeze pressure sensor according to claim 1, characterized in that: The liquid outlet (12) comprises: a third hole section (121), arranged in a horizontal direction, the third hole section (121) passing through one side of the housing (10), the third hole section (121) forming a liquid outlet; and The fourth hole segment (122) is arranged in the up-down direction, and the fourth hole segment (122) is connected to the third hole segment (121) and the pressure-sensitive flow channel (33).

4. The antifreeze pressure sensor according to claim 1, characterized in that: The liquid inlet flow channel (31) and the liquid outlet flow channel (32) are arranged relative to the pressure-sensitive flow channel (33), and the liquid inlet flow channel (31) and the liquid outlet flow channel (32) are both arranged to be inclined in an up-down direction.

5. The antifreeze type pressure sensor according to claim 1 or 4, characterized in that: The aperture of the liquid inlet flow channel (31) gradually shrinks in the direction of liquid flow, and the aperture of the liquid outlet flow channel (32) gradually expands in the direction of liquid flow.

6. The antifreeze pressure sensor according to claim 1, characterized in that: The liquid inlet flow channel (31) and the liquid outlet flow channel (32) are respectively connected to the middle section of the pressure-sensitive flow channel (33); a baffle (34) is provided in the pressure-sensitive flow channel (33); the baffle (34) is arranged in a vertical direction; the baffle (34) is arranged at the upper part of the pressure-sensitive flow channel (33) and extends downward to below the position where the liquid inlet flow channel (31) and the liquid outlet flow channel (32) are connected to the pressure-sensitive flow channel (33); the liquid inlet flow channel (31) and the liquid outlet flow channel (32) are respectively arranged on both sides of the baffle (34).

7. The antifreeze pressure sensor according to claim 1, characterized in that: The bottom wall of the accommodating cavity is provided with a first sealing groove, a second sealing groove and a third sealing groove, the first sealing groove is arranged around the buffer groove (13), the second sealing groove is arranged around the communication position between the liquid inlet hole (11) and the liquid inlet channel (31), and the third sealing groove is arranged around the communication position between the liquid outlet channel (32) and the liquid outlet hole (12); The antifreeze type pressure sensor further comprises a sealing member (50), wherein the sealing member (50) comprises a first sealing portion (51) arranged in the first sealing groove, a second sealing portion (52) arranged in the second sealing groove, and a third sealing portion (53) arranged in the third sealing groove, wherein the first sealing portion (51) comprises folds, the guide block (30) is arranged above the first sealing portion (51), and the elastomer (20) is arranged below the first sealing portion (51); the first sealing portion (51) is used to close the top opening of the buffer groove (13), and the second sealing portion (52) and the third sealing portion (53) are respectively used to seal the joint surface between the guide block (30) and the bottom wall of the accommodating cavity.

8. The antifreeze pressure sensor according to claim 1, characterized in that: The pressure sensing component (40) comprises: A pressure-sensitive core (41) is disposed in the accommodating cavity and is located above the guide block (30), the pressure-sensitive core (41) forming the pressure sensing end; and A circuit board (42) is disposed in the accommodating cavity and is electrically connected to the pressure-sensitive core (41); the housing (10) has a connection terminal (14) electrically connected to the circuit board (42).

9. The antifreeze pressure sensor according to claim 8, characterized in that: The pressure-sensing component (40) further comprises a support plate (43), wherein the support plate (43) is arranged above the pressure-sensing core (41), the circuit board (42) is arranged on the support plate (43), a buckle (431) is arranged on the side wall of the support plate (43), and a slot adapted to be engaged with the buckle (431) is arranged on the inner wall of the accommodating cavity.

10. The antifreeze pressure sensor according to claim 1, characterized in that: The top of the accommodating cavity is open, and the inner wall of the accommodating cavity is provided with an annular accommodating groove. The antifreeze type pressure sensor also includes an upper cover (60), and the upper cover (60) is covered at the opening of the accommodating cavity, and the side wall of the upper cover (60) is accommodated in the accommodating groove, and the accommodating groove is provided with a sealant (61).

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