Pressure sensor connection gas circuit structure and electric proportional valve

Abstract

The utility model discloses a pressure sensor connection gas circuit structure and an electric proportional valve. The structure comprises a pressure sensor, a control box and a mounting seat, the control box comprises a shell and a switching part, and the interior of the switching part is hollow to form a first airflow channel; the mounting seat comprises a body part and a protruding part, and the protruding part is hollow to form a second airflow channel; the switching part abuts against the protruding part, the first airflow channel is communicated with the second airflow channel, the pressure sensor abuts against the switching part, and the sensing end of the pressure sensor protrudes into the first airflow channel to sense the gas pressure. The abutting position of the pressure sensor and the switching part and the abutting position of the switching part and the protruding part are sealed through sealing pieces respectively. According to the utility model, the pressure sensor is abutted against the switching part connected to the shell, the switching part is abutted against the protruding part, and gaps at the abutting parts are sealed through the sealing elements, so that the requirements on the production precision and the installation precision of parts are reduced while air flow is prevented from diffusing outwards.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic components, in particular to a pressure sensor connecting air circuit structure and an electro-pneumatic proportional valve. Background Art

[0002] The electro-pneumatic proportional valve internally is a closed-loop control system, mainly composed of a gas transmission structure part, a signal acquisition part and a signal control part. The connection between the gas transmission structure part and the signal acquisition part is crucial. The signal acquisition part usually adopts a pressure sensor, and the pressure sensor and the gas transmission structure part form a pressure sensor connecting air circuit structure.

[0003] Refer Figure 1 As shown, the electro-pneumatic proportional valve includes a pressure sensor connecting air circuit structure. The pressure sensor connecting air circuit structure includes a mounting seat 103, a pressure sensor 104 and a sealing ring 105. The mounting seat 103 includes a body part 1031 and a protruding part 1032 extending from the body part 1031. The inside of the protruding part 1032 is hollow to form an air flow channel 1033. The pressure sensor 104 is welded on a circuit board 102. A sealing ring 105 is sleeved on the sensing end 1041 of the pressure sensor 104. The sensing end 1041 protrudes into the air flow channel 1033. The sealing ring 105 is used to block an air leakage channel 106 formed between the sensing end 1041 and the inner wall of the protruding part 1032, and prevent the air flow in the air flow channel 1033 from diffusing outwards through the air leakage channel 106, so as not to affect the sensing of the gas pressure flowing into the air flow channel 1033 by the pressure sensor 104. The pressure sensor connecting air circuit structure further includes a control box 101. The control box 101 is installed on the mounting seat 103 and a control cavity is formed inside the control box 101. The circuit board 102 is fixed in the control cavity of the control box 101 by a fixing member. The pressure sensor 104 is communicatively connected with the circuit board 102.

[0004] In order to ensure the air tightness of the pressure sensor connection gas path structure and the accuracy of pressure sensor sensing, the sensing end 1041 of the pressure sensor 104 needs to accurately protrude into the air flow channel 1033. At the same time, in order to prevent the air flow in the air flow channel 1033 from leaking outward from the air flow channel 106, it is necessary to ensure high accuracy requirements for the positioning of the control box 101 installed on the mounting seat 103, the installation position of the circuit board 102 locked in the control cavity, the welding position of the pressure sensor 104 on the circuit board 102, and the aperture size of the flow channel hole at the top of the air flow channel 1033. If there is any installation deviation or production error, The deviation will cause the sensing end 1041 of the pressure sensor 104 to be unable to protrude into the airflow channel 1033. Even if the sensing end 1041 protrudes into the airflow channel 1033 with an offset (i.e., the sensing end 1041 does not protrude into the airflow channel 1033 in the middle), due to a slight installation position deviation or component production accuracy deviation, the sealing ring 105 mounted on the sensing end 1041 of the pressure sensor 104 may be partially over-squeezed and partially insufficiently squeezed, causing the airflow in the airflow channel 1033 to diffuse outward to the leakage channel 106 where the sealing ring 105 is not fully squeezed. Therefore, this solution has high requirements on the production accuracy and installation accuracy of each component, and also increases the risk of air leakage in the leakage channel 106 due to insufficient installation accuracy, thereby reducing the air tightness of the pressure sensor connection gas path structure and the pressure sensor detection accuracy.

[0005] Therefore, there is an urgent need for a pressure sensor connected to an air path structure and an electric proportional valve to solve the above technical problems. Utility Model Content

[0006] The main purpose of the utility model is to provide a pressure sensor connecting gas path structure and an electric proportional valve, aiming to solve the technical problems of high production and installation precision requirements and poor air tightness of the pressure sensor connecting gas path structure in the existing technical solutions.

[0007] To achieve the above object, the utility model proposes a pressure sensor connecting gas path structure, the structure comprising:

[0008] A pressure sensor, the pressure sensor comprising a sensing end, the pressure sensor being fixed to a circuit board;

[0009] A control box, the control box comprising a shell and a connecting portion connected to an inner wall of the shell, wherein the connecting portion is hollow inside and has a first airflow channel formed therein;

[0010] A mounting seat, the mounting seat comprising a main body and a protruding portion extending from the main body, wherein the protruding portion is hollow inside and has a second air flow channel formed therein;

[0011] in:

[0012] The adapter abuts against the top of the protruding portion and the first airflow channel and the second airflow channel are connected to each other, the pressure sensor abuts against the top of the adapter, and the sensing end of the pressure sensor protrudes into the first airflow channel to sense the pressure of the gas flowing in from the second airflow channel, and the abutment between the pressure sensor and the adapter and the abutment between the adapter and the protruding portion are sealed by sealing members respectively.

[0013] In one embodiment of the utility model, an annular groove connected to the first airflow channel is provided on the top of the adapter portion, and the seal includes a first seal, which is sleeved on the sensing end of the pressure sensor and accommodated in the annular groove, and the first seal is squeezed by the sensing end to both sides in the axial direction.

[0014] In an embodiment of the present utility model, the pressure sensor further comprises a main body, the sensing end of the pressure sensor is formed by protruding from the main body, and the bottom surface of the main body is pressed against the upper surface of the adapter.

[0015] In one embodiment of the utility model, a receiving groove connected to the second airflow channel is provided on the top of the protruding portion of the mounting seat, and the seal also includes a second seal, which is arranged in the receiving groove, and the lower surface of the adapter portion is crimped to the top surface of the protruding portion, and the second seal is squeezed downward by the adapter portion in the lateral direction.

[0016] In an embodiment of the present invention, the center of the bottom opening of the first airflow channel and the center of the top opening of the second airflow channel are located on the same central axis or are staggered in the lateral direction.

[0017] In an embodiment of the present invention, the adapter portion and the housing are integrally injection molded, and the adapter portion is in a straight or V-shape in a vertical section.

[0018] In an embodiment of the present invention, ears are provided at both ends of the adapter, and the circuit board is fastened to the ears by fasteners so that the circuit board is locked to the control box.

[0019] In one embodiment of the present invention, one of the bottom of the shell and the top of the main body of the mounting seat is provided with a positioning portion, and the other is provided with a positioning groove, and the positioning portion is positioned and fixed in the positioning groove to fix the control box to the mounting seat.

[0020] In one embodiment of the utility model, the structure further comprises an intake pilot valve and an exhaust pilot valve, the intake pilot valve and the exhaust pilot valve are arranged on both sides of the protruding portion, and the intake pilot valve and the exhaust pilot valve are communicatively connected with the circuit board.

[0021] In order to achieve the above object, the utility model further provides an electric proportional valve, which includes the pressure sensor connecting gas path structure as described above.

[0022] The technical solution of the utility model proposes a pressure sensor connecting air path structure, which structure includes: a pressure sensor, the pressure sensor includes a sensing end, and the pressure sensor is fixed to a circuit board; a control box, the control box includes an outer shell and an adapter part connected to the inner wall of the outer shell, the interior of the adapter part is hollow to form a first airflow channel; a mounting seat, the mounting seat includes a main body and a protruding part extending from the main body, the interior of the protruding part is hollow to form a second airflow channel; wherein: the adapter part abuts against the top of the protruding part and the first airflow channel and the second airflow channel are connected to each other, the pressure sensor abuts against the top of the adapter part, and the sensing end of the pressure sensor protrudes into the first airflow channel to sense the gas pressure flowing in from the second airflow channel, and the abutment between the pressure sensor and the adapter part and the abutment between the adapter part and the protruding part are respectively sealed by sealing members. The present application achieves this by abutting the pressure sensor against the adapter part connected to the housing, and abutting the adapter part against the protruding part, and sealing the gap at the abutment between the pressure sensor and the adapter part and the gap at the abutment between the adapter part and the protruding part through a seal. While preventing the airflow from diffusing outward, the requirements for the production accuracy and installation accuracy of the parts are reduced, and the risk of air leakage caused by inaccurate positioning is reduced. At the same time, the pressure sensor abuts against the adapter part connected as an integral part of the housing, which makes the pressure sensor more stable. Even if the pressure sensor connection gas path structure is used in a vibrating environment, it can avoid fluctuating wear of the pressure sensor, thereby improving the stability of the pressure sensor signal acquisition and enhancing the service life and performance of the electric proportional valve using the pressure sensor connection gas path structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a structural cross-sectional view of a pressure sensor connected to a gas path structure in the prior art;

[0025] Figure 2 This is a structural cross-sectional view of the gas path structure connected to the pressure sensor of the utility model;

[0026] Figure 3 For the utility model Figure 2 Enlarged structural diagram at A in the middle.

[0027] Description of the attached reference numerals:

[0028]

[0029]

[0030] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0033] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] The present utility model provides a pressure sensor connecting gas path structure, aiming to solve the technical problems in the prior art solutions that the production and installation accuracy requirements of the pressure sensor connecting gas path structure are high and the airtightness is poor.

[0036] In the embodiments of the present utility model, a pressure sensor connecting gas path structure is provided, and this structure includes:

[0037] A pressure sensor 1, the pressure sensor 1 comprises a sensing end 11, and the pressure sensor 1 is fixed to a circuit board 2;

[0038] The control box 3 includes a housing 31 and a connecting portion 32 connected to the inner wall of the housing 31. The connecting portion 32 is hollow inside to form a first airflow channel 321.

[0039] The mounting base 4 includes a main body 41 and a protruding portion 42 extending from the main body 41 . The protruding portion 42 is hollow inside and has a second air flow channel 421 formed therein;

[0040] in:

[0041] The adapter portion 32 abuts against the top of the protruding portion 42 and the first airflow channel 321 and the second airflow channel 421 are connected to each other, the pressure sensor 1 abuts against the top of the adapter portion 32, and the sensing end 11 of the pressure sensor 1 protrudes into the first airflow channel 321 to sense the gas pressure flowing in from the second airflow channel 421, and the abutment between the pressure sensor 1 and the adapter portion 32 and the abutment between the adapter portion 32 and the protruding portion 42 are sealed by sealing members respectively.

[0042] The internal part of the electrically controlled proportional valve is a closed-loop control system, which is mainly composed of a gas transmission structure, a signal acquisition part and a signal control part. The connection between the gas transmission structure and the signal acquisition part is crucial. The signal acquisition part usually uses a pressure sensor 1, and the pressure sensor and the gas transmission structure constitute a pressure sensor connection gas path structure.

[0043] Ginseng Figure 2 As shown, the electric proportional valve is provided with a pressure sensor connecting gas path structure, which includes a pressure sensor 1, a control box 3, a mounting seat 4 and a sealing member.

[0044] The pressure sensor 1 is welded and fixed to a circuit board 2 and is in communication connection with the circuit board 2 . The pressure sensor 1 senses the gas pressure in the gas path and feeds back the gas pressure value to the circuit board 2 .

[0045] The control box 3 includes a housing 31 and a transition part 32 connected to the inner wall of the housing 31, and the interior of the transition part 32 is hollow to form a first airflow channel 321. The mounting seat 4 includes a main body 41 and a protrusion 42 extending from the main body 41, and the interior of the protrusion 42 is hollow to form a second airflow channel 421. The pressure sensor 1 abuts against the top of the transition part 32 in the axial direction. Specifically, a seal is sleeved on the periphery of the sensing end 11 of the pressure sensor 1. During assembly, the sensing end 11 sleeved with the seal is protruded into the first airflow channel 321 of the transition part 32 in the axial direction (up and down direction), and at the same time, the sensing end 11 uniformly presses the seal outward in the axial direction so that the degree of compression of each part of the seal is roughly uniform, so as to prevent the airflow in the first airflow channel 321 from spreading outward from the leakage flow channel formed between the sensing end 11 and the hollow inner wall of the transition part 32. A sealing member is further provided in the top flow channel hole of the second air flow channel 421, and the adapter portion 32 is abutted against the upper surface of the protruding portion 42 and the sealing member in the axial direction, so that the first air flow channel 321 of the adapter portion 32 and the second air flow channel 421 of the protruding portion 42 are sealed and connected in the axial direction through the sealing member. Since the adapter portion 32 presses the sealing member downward in the lateral direction, the air flow in the second air flow channel 421 can be prevented from diffusing outward from the abutment between the adapter portion 32 and the protruding portion 42 when flowing to the first air flow channel 321.

[0046] When installing the present application, the pressure sensor 1 is first abutted against the adapter portion 32 in the axial direction, so that the seal outside the sensing end 11 of the pressure sensor 1 can be evenly squeezed in the axial direction, and then the adapter portion 32 is abutted against the protruding portion 42 in the axial direction. Since the adapter portion 32 squeezes the seal arranged in the top flow channel hole of the second air flow channel 421 downward in the lateral direction, the air flow in the second air flow channel 421 can be prevented from diffusing outward when flowing toward the first air flow channel 321. Since the seal is squeezed in the lateral direction here, it is not necessary to accurately align the bottom opening of the first air flow channel 321 with the center of the top opening of the second air flow channel 421 during installation, and partial installation misalignment can be allowed, as long as the first air flow channel 321 and the second air flow channel 421 are sealed and connected by the seal. The total air flow channel formed by the first air flow channel 321 and the second air flow channel 421 can produce an allowed channel offset at the abutment between the adapter portion 32 and the protruding portion 42, thereby reducing the accuracy requirement for the lateral positioning of the adapter portion 32 and the protruding portion 42.

[0047] Therefore, in the pressure sensor connecting air path structure, the adapter part 32 integrally connected to the housing 31 and the seal are assembled and matched to prevent the outward diffusion of air flow while reducing the requirements for the production accuracy and installation accuracy of parts, and improving the sensing accuracy of the sensing end 11 of the pressure sensor 1 protruding into the first air flow channel 321 for the gas pressure value flowing in from the second air flow channel 421. In addition, since the adapter part 32 is connected to the housing 31, there will be better stability between the pressure sensor 1 and the adapter part 32 that are abutted together. Even if the pressure sensor connecting air path structure is applied in a vibrating environment, it can avoid the pressure sensor 1 from being damaged or the sensing accuracy from decreasing due to fluctuating wear, and enhance the service life of the electro-hydraulic proportional valve using this pressure sensor connecting air path structure.

[0048] The technical solution of the present utility model proposes a pressure sensor connecting air path structure, which includes: a pressure sensor 1, the pressure sensor 1 includes a sensing end 11, and the pressure sensor 1 is fixed to a circuit board 2; a control box 3, the control box 3 includes a housing 31 and an adapter part 32 connected to the inner side wall of the housing 31, and a first air flow channel 321 is formed inside the adapter part 32 with a hollow interior; a mounting seat 4, the mounting seat 4 includes a body part 41 and a protruding part 42 extending from the body part 41, and a second air flow channel 421 is formed inside the protruding part 42 with a hollow interior; wherein: the adapter part 32 abuts above the protruding part 42 and the first air flow channel 321 is in communication with the second air flow channel 421, the pressure sensor 1 abuts above the adapter part 32, and the sensing end 11 of the pressure sensor 1 protrudes into the first air flow channel 321 to sense the gas pressure flowing in from the second air flow channel 421, and the abutting part between the pressure sensor 1 and the adapter part 32 and the abutting part between the adapter part 32 and the protruding part 42 are respectively sealed by a seal. In this application, the pressure sensor 1 is abutted on the adapter part 32 connected to the housing 31, and the adapter part 32 is abutted on the protruding part 42. The gaps at the abutting parts between the pressure sensor 1 and the adapter part 32 and between the adapter part 32 and the protruding part 42 are sealed by seals, which prevents the outward diffusion of air flow while reducing the requirements for the production accuracy and installation accuracy of parts, reducing the risk of air leakage caused by inaccurate positioning. At the same time, the pressure sensor 1 is abutted on the adapter part 32 integrally connected to the housing 31, so that the pressure sensor 1 has better stability. Even if the pressure sensor connecting air path structure is applied in a vibrating environment, it can avoid the pressure sensor 1 from experiencing fluctuating wear, improve the stability of signal acquisition of the pressure sensor 1, and enhance the service life and performance of the electro-hydraulic proportional valve using this pressure sensor connecting air path structure.

[0049] Further, a ring groove 322 communicating with the first air flow channel 321 is provided at the top of the adapter portion 32. The seal includes a first seal 51. The first seal 51 is sleeved on the sensing end 11 of the pressure sensor 1 and is received in the ring groove 322. The first seal 51 is axially squeezed by the sensing end 11 towards the transverse sides.

[0050] It can be understood that, please refer to Figure 2 and Figure 3 As shown, in this embodiment, a ring groove 322 communicating with the first air flow channel 321 is recessed at the top of the adapter portion 32. The seal includes a first seal 51. The first seal 51 may specifically be an O-ring. During installation, first, the first seal 51 is sleeved on the sensing end 11 of the pressure sensor 1, and then the sensing end 11 sleeved with the first seal 51 is axially abutted in the first air flow channel 321 of the adapter portion 32 and the first seal 51 is received in the ring groove 322. By setting the thickness of the first seal 51 to be greater than the width of the ring groove 322 in the transverse direction, the first seal 51 is axially squeezed by the sensing end 11 towards the transverse sides (outer sides), that is, the first seal 51 is uniformly flattened axially, so as to prevent the air flow in the first air flow channel 321 from diffusing out through the air leakage channel formed between the sensing end 11 and the hollow inner wall of the adapter portion 32, thereby affecting the sensing of the gas pressure flowing into the first air flow channel 321 by the pressure sensor 1. Since in this embodiment, the pressure sensor 1 is axially abutted against the adapter portion 32 first, it only needs to ensure that the sensing end 11 of the pressure sensor 1 is inserted into the first air flow channel 321 of the adapter portion 32 and the first seal 51 is uniformly squeezed and sealed, and the installation steps are simple.

[0051] Further, the pressure sensor 1 further includes a main body portion 12. The sensing end 11 of the pressure sensor 1 protrudes from the main body portion 12, and the bottom surface of the main body portion 12 is press-connected to the upper surface of the adapter portion 32.

[0052] It is easy to understand that, please refer to Figure 2 and Figure 3 As shown, the pressure sensor 1 further includes a main body portion 12. The sensing end 11 protrudes from the main body portion 12. The pressure sensor 1 is abutted against the adapter portion 32 such that the bottom surface of the main body portion 12 is press-connected to the upper surface of the adapter portion 32. In this way, the bottom surface of the main body portion 12 of the pressure sensor 1 and the side surface of the sensing end 11 completely surround the ring groove 322. The first seal 51 is not only axially squeezed by the sensing end 11 towards the transverse sides but also limited by the surfaces of each part surrounding the ring groove 322, enhancing the sealing performance after the pressure sensor 1 is abutted against the adapter portion 32.

[0053] Furthermore, a receiving groove 422 connected to the second air flow channel 421 is provided at the top of the protruding portion 42 of the mounting seat 4, and the seal also includes a second seal 52, and the second seal 52 is arranged in the receiving groove 422, and the lower surface of the adapter portion 32 is crimped to the top surface of the protruding portion 42, and the second seal 52 is squeezed downward by the adapter portion 32 in the lateral direction.

[0054] Understandable, please refer to Figure 2 and Figure 3 As shown, in this embodiment, the top of the protruding portion 42 of the mounting seat 4 is recessed with a receiving groove 422 that is connected to the second airflow channel 421. The seal also includes a second seal 52, which can be specifically a sealing ring. During installation, the second seal 52 is arranged in the receiving groove 422, and the adapter portion 32 abuts against the protruding portion 42 in the axial direction, and the gap at the abutment between the adapter portion 32 and the protruding portion 42 is blocked by the second seal 52. Specifically, the adapter portion 32 abuts against the protruding portion 42 in the axial direction, and the lower surface of the adapter portion 32 is pressed against the top surface of the protruding portion 42. At the same time, the adapter portion 32 presses the second seal 52 arranged in the receiving groove 422 downward in the lateral direction, and the first airflow channel 321 and the second airflow channel 421 are sealed and connected in the axial direction through the second seal 52. Since the adapter 32 in this embodiment squeezes the second seal 52 disposed in the accommodating groove 422 in the lateral direction, partial installation misalignment between the adapter 32 and the protruding portion 42 is allowed during installation, that is, the center of the bottom opening of the first airflow channel 321 and the center of the top opening of the second airflow channel 421 are not located on the same central axis but are offset in the lateral direction, and the total airflow channel formed by the first airflow channel 321 and the second airflow channel 421 is allowed to have a channel offset at the abutment between the adapter 32 and the protruding portion 42, and this offset is within the allowable range of the installation tolerance, because the second seal 52 squeezed laterally can effectively prevent the gas from diffusing outward from the offset position. This reduces the requirements for the production accuracy and installation accuracy of the parts, making the installation more convenient and efficient, and at the same time improving the air tightness of the pressure sensor connection gas path structure.

[0055] Further, the center of the bottom opening of the first air flow channel 321 and the center of the top opening of the second air flow channel 421 are located on the same central axis or are staggered in the lateral direction.

[0056] Understandable, Figure 2 and Figure 3As shown in the figure, when the adapter portion 32 is abutted against the protruding portion 42, the center of the bottom opening of the first air flow channel 321 can be aligned with the center of the top opening of the second air flow channel 421 for installation, so that the center of the bottom opening of the first air flow channel 321 and the center of the top opening of the second air flow channel 421 are located on the same central axis. Of course, since the adapter portion 32 presses the second seal 52 disposed in the receiving groove 422 downward in the lateral direction, it is also possible not to align the center of the bottom opening of the first air flow channel 321 with the center of the top opening of the second air flow channel 421 during installation, but to stagger the center of the bottom opening of the first air flow channel 321 and the center of the top opening of the second air flow channel 421 in the lateral direction, as long as it is ensured that the first air flow channel 321 and the second air flow channel 421 are sealed and communicated by the second seal 52. Compared with the method that requires center alignment installation, this method that does not require center alignment installation greatly reduces the production accuracy and installation accuracy requirements of parts, making production and installation more convenient and efficient.

[0057] In this embodiment, first, the sensing end 11 sleeved with the first seal 51 is axially abutted against the first air flow channel 321 of the adapter portion 32 and the first seal 51 is placed in the annular groove 322, so that the first seal 51 is evenly squeezed by the sensing end 11 in the axial direction toward the lateral sides, to prevent the air flow in the first air flow channel 321 from diffusing outward from the abutting portion between the pressure sensor 1 and the adapter portion 32. Then, the second seal 52 is disposed in the receiving groove 422 of the protruding portion 42, and the adapter portion 32 is axially abutted against the protruding portion 42. The second seal 52 is squeezed downward in the lateral direction by the adapter portion 32. Therefore, the air flow in the second air flow channel 421 will not diffuse outward from the abutting portion between the adapter portion 32 and the protruding portion 42 when flowing into the first air flow channel 321. Therefore, partial installation misalignment between the adapter portion 32 and the protruding portion 42 is allowed, that is, although the bottom opening of the first air flow channel 321 and the top opening of the second air flow channel 421 are sealed and communicated, the centers of the respective openings are not completely aligned but are staggered in the lateral direction, reducing the accuracy requirement for the lateral positioning of the adapter portion 32 and the protruding portion 42. Since the airtightness of the pressure sensor connection air path structure is realized through the axial seal at the abutting portion between the pressure sensor 1 and the adapter portion 32 (that is, the first seal 51 is squeezed in the axial direction toward the lateral direction) and the lateral seal at the splicing portion between the adapter portion 32 and the protruding portion 42 (that is, the second seal 52 is squeezed downward in the lateral direction) in the solution of this embodiment, the sensing of the air flow pressure in the first air flow channel 321 by the pressure sensor 1 is ensured. At the same time, due to the adoption of the double-seal structure design of the adapter portion 32 and the seal (axial seal plus lateral seal), the accuracy requirement for the lateral positioning between the first air flow channel 321 and the second air flow channel 421 can be reduced, and the production accuracy requirement and installation accuracy requirement of parts can be reduced.

[0058] Furthermore, the adapter portion 32 and the housing 31 are integrally injection-molded, and the adapter portion 32 is in a straight shape or a V shape in a vertical cross-section.

[0059] For easy understanding, please refer to Figure 2 As shown, the vertical cross-section is the cross-section of the pressure sensor connecting air path structure in the up and down direction. In this embodiment, the adapter portion 32 and the housing 31 are integrally injection-molded, so that the pressure sensor 1 abutted on the adapter portion 32 has better stability. Even when the pressure sensor connecting air path structure is applied in a vibrating environment, it can avoid the pressure sensor 1 from being damaged or the sensing accuracy from decreasing due to fluctuating wear, and enhances the service life of the electro-pneumatic proportional valve using this pressure sensor connecting air path structure. In addition, the adapter portion 32 can be set in a straight shape or a V shape in the vertical cross-section. This embodiment is not limited. The adapter portion 32 with a straight shape or a V shape in the vertical cross-section has a better stabilizing effect on the pressure sensor 1.

[0060] Furthermore, ears 323 are provided at both ends of the adapter portion 32, and the circuit board 2 is fastened to the ears 323 by fasteners 6 so that the circuit board 2 is locked to the control box 3.

[0061] For easy understanding, please refer to Figure 2 As shown, ears 323 for fastening the circuit board 2 are provided at both ends of the adapter portion 32, and the circuit board 2 is fastened to the ears 323 by fasteners 6 so that the circuit board 2 is locked to the control box 3. The fasteners 6 can be screws, and this embodiment is not limited.

[0062] Furthermore, one of the bottom of the housing 31 and the top of the main body portion 41 of the mounting seat 4 is provided with a positioning portion, and the other is provided with a positioning groove. The positioning portion is positioned and fixed in the positioning groove so that the control box 3 is fixed to the mounting seat 4.

[0063] For easy understanding, please refer to Figure 2 As shown, in this embodiment, a positioning portion 311 is convexly formed at the bottom of the housing 31, and a positioning groove 43 is concavely formed at the top of the main body portion 41 of the mounting seat 4. The control box 3 is stably mounted on the mounting seat 4 through the positioning cooperation between the positioning portion 311 and the positioning groove 43. Of course, in other embodiments, the positioning portion can be provided at the top of the main body portion 41, and the positioning groove can be provided at the bottom of the housing 31. The structural cooperation between the positioning portion 311 and the positioning groove 43 can be the cooperation between a positioning pin and a groove, and this embodiment is not limited.

[0064] In this embodiment, the circuit board 2 is fastened to the ear part 323 by a fastener 6 so that the circuit board 2 is locked in the control box 3, and the control box 3 is stably installed on the mounting base 4 through the positioning cooperation between the positioning part 311 and the positioning groove 43. Since the airtightness of the pressure sensor connecting air circuit structure is achieved through the axial sealing at the abutting position of the pressure sensor 1 and the adapter part 32 in the pressure sensor connecting air circuit structure (i.e., the first seal 51 is axially extruded in the lateral direction) and the lateral sealing at the abutting position of the adapter part 32 and the protruding part 42 (i.e., the second seal 52 is laterally extruded downward), the airtightness of the pressure sensor connecting air circuit structure is ensured, guaranteeing the sensing of the air pressure in the first air flow channel 321 by the pressure sensor 1. At the same time, due to the two - stage sealing structure design of the adapter part 32 and the seal (axial sealing plus lateral sealing), the requirement for the lateral positioning accuracy between the first air flow channel 321 and the second air flow channel 421 can be reduced. Therefore, the requirement for the installation and positioning accuracy of the circuit board 2 mounted on the ear part 323 and the requirement for the installation and positioning accuracy between the control box 3 and the mounting base 4 can be further reduced, allowing a certain tolerance between the mutually cooperating components, and further reducing the production accuracy requirement and installation accuracy requirement of the parts.

[0065] Furthermore, the pressure sensor connecting air circuit structure further includes an intake pilot valve 7 and an exhaust pilot valve 8. The intake pilot valve 7 and the exhaust pilot valve 8 are arranged on both sides of the protruding part 42, and the intake pilot valve 7 and the exhaust pilot valve 8 are communicatively connected to the circuit board 2.

[0066] It is easy to understand that, please refer to Figure 2 As shown, the intake pilot valve 8 and the exhaust pilot valve 9 are respectively arranged on both sides of the protruding part 42 and are communicatively connected to the circuit board 2. The pressure sensor 1 is communicatively connected to the circuit board 2. The pressure sensor 1 senses the gas pressure in the first air flow channel 321 and transmits it to the circuit board 2 through communication. The circuit board 2 judges whether the air pressure conforms to the set value; when the detected air pressure does not conform to the set value, the opening and closing of the intake pilot valve 7 and / or the exhaust pilot valve 8 are controlled to adjust the air pressure in the first air flow channel 321 until the air pressure in the first air flow channel 321 conforms to the set value, thereby realizing the continuous and stepless adjustment of the air pressure.

[0067] The present utility model also proposes an electro - pneumatic proportional valve, and the electro - pneumatic proportional valve includes the pressure sensor connecting air circuit structure as described above. The specific structure of the pressure sensor connecting air circuit structure refers to the above - mentioned embodiment. Since this electro - pneumatic proportional valve adopts all the technical solutions of the above - mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above - mentioned embodiments, and will not be elaborated one by one here.

[0068] The above are only the preferred embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A pressure sensor connected to a gas path structure, the structure comprising: A pressure sensor (1), the pressure sensor (1) comprising a sensing end (11), the pressure sensor (1) being fixed to a circuit board (2); A control box (3), the control box (3) comprising a shell (31) and a connecting portion (32) connected to an inner wall of the shell (31), the connecting portion (32) being hollow inside and forming a first airflow channel (321); A mounting seat (4), the mounting seat (4) comprising a main body (41) and a protruding portion (42) extending from the main body (41), the protruding portion (42) being hollow inside and having a second air flow channel (421); in: The adapter portion (32) abuts against the top of the protruding portion (42), and the first air flow channel (321) and the second air flow channel (421) are connected to each other. The pressure sensor (1) abuts against the top of the adapter portion (32), and the sensing end (11) of the pressure sensor (1) protrudes into the first air flow channel (321) to sense the pressure of the gas flowing into the second air flow channel (421). The abutment between the pressure sensor (1) and the adapter portion (32) and the abutment between the adapter portion (32) and the protruding portion (42) are sealed by sealing members respectively.

2. The pressure sensor connecting gas path structure according to claim 1, characterized in that, The top of the adapter portion (32) is provided with an annular groove (322) which is in communication with the first air flow channel (321); the sealing member comprises a first sealing member (51); the first sealing member (51) is sleeved on the sensing end (11) of the pressure sensor (1) and accommodated in the annular groove (322); the first sealing member (51) is squeezed in the axial direction by the sensing end (11) towards both sides in the lateral direction.

3. The pressure sensor connecting gas path structure according to claim 2, wherein, The pressure sensor (1) further comprises a main body (12), the sensing end (11) of the pressure sensor (1) protruding from the main body (12), and the bottom surface of the main body (12) is pressed against the upper surface of the adapter (32).

4. The pressure sensor connection gas path structure according to claim 1, wherein, The top of the protruding portion (42) of the mounting seat (4) is provided with a receiving groove (422) which is connected to the second air flow channel (421), and the sealing member also includes a second sealing member (52). The second sealing member (52) is arranged in the receiving groove (422), and the lower surface of the transition portion (32) is pressed against the top surface of the protruding portion (42), and the second sealing member (52) is squeezed downward by the transition portion (32) in the lateral direction.

5. The pressure sensor connecting gas path structure according to claim 1, wherein The center of the bottom opening of the first airflow channel (321) and the center of the top opening of the second airflow channel (421) are located on the same central axis or are staggered in the transverse direction.

6. The pressure sensor connecting air path structure according to claim 1, characterized in that, The adapter part (32) and the housing (31) are integrally injection-molded, and the adapter part (32) is in a straight line or V shape in vertical section.

7. The pressure sensor connecting gas path structure according to claim 6, characterized in that Ears (323) are provided at both ends of the adapter portion (32), and the circuit board (2) is fastened to the ears (323) via fasteners (6) so that the circuit board (2) is locked to the control box (3).

8. The pressure sensor connecting gas path structure according to claim 1, characterized in that, One of the top of the bottom of the housing (31) and the main body portion (41) of the mounting base (4) is provided with a positioning portion, and the other is provided with a positioning groove. The positioning portion is positioned and fixed in the positioning groove so that the control box (3) is fixed to the mounting base (4).

9. The pressure sensor connecting gas path structure according to claim 1, characterized in that The structure further includes an intake pilot valve (7) and an exhaust pilot valve (8). The intake pilot valve (7) and the exhaust pilot valve (8) are arranged on both sides of the protruding portion (42), and the intake pilot valve (7) and the exhaust pilot valve (8) are communicatively connected to the circuit board (2).

10. An electro-hydraulic proportional valve, characterized in that: The electro-hydraulic proportional valve includes the pressure sensor connection air circuit structure according to any one of claims 1 to 9.

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