Gas circulation structure and electric proportional valve

Abstract

The utility model discloses a gas circulation structure and an electric proportional valve, the gas circulation structure comprises a pressure sensor, a switching block and a base, and the pressure sensor comprises a detection end; the interior of the adapter block is through to form a first airflow path; the base comprises a main body part and an extension part formed by extending from the main body part, and the interior of the extension part is through to form a second airflow path; wherein the switching block is arranged between the pressure sensor and the extension part through a sealing element, a first airflow path of the switching block is in sealed communication with a second airflow path of the extension part through the sealing element, and the detection end of the pressure sensor protrudes into the first airflow path to detect the pressure of gas flowing in from the second airflow path. According to the technical scheme of the utility model, the adapter block is additionally arranged between the pressure sensor and the extension part, and the splicing gaps between the adapter block and the pressure sensor and between the adapter block and the extension part are sealed by the sealing element, 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 gas flow structure and an electric proportional valve. Background Art

[0002] The electric proportional valve has a closed-loop control system inside, 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, and the pressure sensor and the gas transmission structure form a gas flow structure.

[0003] Ginseng Figure 1 As shown, the electric proportional valve includes a gas flow structure, and the gas flow structure includes a base 103, a pressure sensor 104 and a sealing ring 105. The base 103 includes a main body 1031 and an extension 1032 extending from the main body 1031, and the extension 1032 is connected inside to form an air flow channel 1033; the pressure sensor 104 is welded on a circuit board 102, and a sealing ring 105 is sleeved on the detection end 1041 of the pressure sensor 104, and the detection end 1041 protrudes into the air flow channel 1033. The sealing ring 105 is used to block the leakage flow channel 106 formed between the detection end 1041 and the inner wall of the extension 1032, and the leakage flow channel 106 is blocked to prevent the air flow in the air flow channel 1033 from diffusing outward from the leakage flow channel 106 to affect the pressure sensor 104's detection of the pressure of the gas flowing into the air flow channel 1033. The gas circulation structure also includes a shell 101 , which is mounted on a base 103 and forms a receiving cavity inside the shell 101 . The circuit board 102 is fixed in the receiving cavity of the shell 101 by a fixing member, and the pressure sensor 104 is communicatively connected with the circuit board 102 .

[0004] To ensure the airtightness of the gas flow structure and the accuracy of the pressure sensor detection, the detection end 1041 of the pressure sensor 104 needs to precisely protrude into the air flow channel 1033. At the same time, to prevent the air flow in the air flow channel 1033 from diffusing outward through the air leakage channel 106, high-precision requirements need to be ensured for the positioning of the housing 101 installed on the base 103, the installation position of the circuit board 102 fixed in the accommodation cavity, the welding position of the pressure sensor 104 on the circuit board 102, and the aperture size of the top flow channel hole of the air flow channel 1033, etc. Any installation deviation or production deviation will cause the detection end 1041 of the pressure sensor 104 to be unable to protrude into the air flow channel 1033. Even if the detection end 1041 deviates and protrudes into the air flow channel 1033 (i.e., the detection end 1041 does not protrude into the air flow channel 1033 exactly in the middle), due to the slight installation position deviation or component production precision deviation, the sealing ring 105 sleeved on the detection end 1041 of the pressure sensor 104 will be partially over-pressed and partially not fully pressed, resulting in the air flow in the air flow channel 1033 diffusing outward through the air leakage channel 106 at the position where the sealing ring 105 is not fully pressed. Therefore, this solution has high requirements for the production precision and installation precision of each component, and at the same time increases the risk of air leakage at the air leakage channel 106 due to insufficient installation precision, reducing the airtightness of the gas flow structure and the detection accuracy of the pressure sensor.

[0005] Therefore, there is an urgent need for a gas flow structure and an electro-hydraulic proportional valve to solve the above technical problems. Utility Model Content

[0006] The main purpose of the present utility model is to propose a gas flow structure and an electro-hydraulic proportional valve, aiming to solve the technical problems of high production and installation precision requirements and poor airtightness in the existing technical solutions of the gas flow structure.

[0007] To achieve the above object, the present utility model proposes a gas flow structure, and the gas flow structure includes:

[0008] A pressure sensor, the pressure sensor includes a detection end, and the pressure sensor is fixed to a circuit board;

[0009] An adapter block, the interior of the adapter block is penetrated to form a first air flow path;

[0010] A base, the base includes a main body portion and an extension portion extending from the main body portion, and the interior of the extension portion is penetrated to form a second air flow path;

[0011] Wherein:

[0012] The adapter block is disposed between the pressure sensor and the extension of the base through a sealing element, and a first air flow path of the adapter block and a second air flow path of the extension are hermetically communicated through the sealing element. A detection end of the pressure sensor protrudes into the first air flow path to detect the gas pressure flowing in from the second air flow path.

[0013] In an embodiment of the present invention, a ring-shaped groove is provided at the top of the adapter block. The sealing element includes a first sealing element. The first sealing element is sleeved on the detection end of the pressure sensor and is received in the ring-shaped groove. The first sealing element is axially extruded by the detection end toward the lateral sides.

[0014] In an embodiment of the present invention, the pressure sensor further includes a body structure. The detection end of the pressure sensor extends from the body structure, and the bottom surface of the body structure is press-connected to the upper surface of the adapter block.

[0015] In an embodiment of the present invention, an opening groove is provided at the top of the extension of the base. The sealing element further includes a second sealing element. The second sealing element is disposed in the opening groove. The lower surface of the adapter block is press-connected to the top surface of the extension. The second sealing element is laterally extruded by the adapter block downward.

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

[0017] In an embodiment of the present invention, the gas flow structure further includes a housing;

[0018] The housing surrounds the base to form an accommodation cavity;

[0019] The pressure sensor is communicatively connected to the circuit board and is received in the accommodation cavity.

[0020] In an embodiment of the present invention, a fixing portion extends from the inner surface of the housing into the accommodation cavity. The circuit board is fixed to the fixing portion through a fixing member so that the circuit board is fixed to the housing.

[0021] In an embodiment of the present invention, one of the bottom of the housing and the top of the main body of the base is provided with a clamping portion, and the other is provided with a clamping groove. The clamping portion is clamped in the clamping groove so that the housing is fixed to the base.

[0022] In an embodiment of the present utility model, the gas flow structure further includes an intake valve and an exhaust valve, which are disposed on both sides of the extension portion, and the intake valve and the exhaust valve are communicatively connected to the circuit board.

[0023] To achieve the above object, the present utility model further provides an electro-hydraulic proportional valve, which includes the gas flow structure as described above.

[0024] The technical solution of the present utility model proposes a gas flow structure, which includes: a pressure sensor, the pressure sensor includes a detection end, and the pressure sensor is fixed to a circuit board; a transfer block, the interior of the transfer block is penetrated to form a first gas flow path; a base, the base includes a main body portion and an extension portion extending from the main body portion, and the interior of the extension portion is penetrated to form a second gas flow path; wherein: the transfer block is disposed between the pressure sensor and the extension portion of the base through a sealing element, and the first gas flow path of the transfer block is hermetically communicated with the second gas flow path of the extension portion through the sealing element, and the detection end of the pressure sensor protrudes into the first gas flow path to detect the gas pressure flowing in from the second gas flow path. In this application, by installing a transfer block between the pressure sensor and the extension portion of the base, and sealing the splicing gaps between the transfer block and the pressure sensor and the extension portion through a sealing element, while preventing the outward diffusion of air flow, the requirements for the production accuracy and installation accuracy of parts are reduced, the risk of air leakage caused by inaccurate positioning is reduced, the stability of pressure sensor signal acquisition is improved, and the performance of the electro-hydraulic proportional valve is enhanced. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is a structural cross-sectional view of the gas flow structure in the prior art;

[0027] Figure 2 It is a structural cross-sectional view of the gas flow structure of the present utility model.

[0028] Explanation of the Reference Numerals in the Drawings:

[0029] Name Label Name Label Outer shell 6，101 Circuit board 2，102 Base 4，103 Main body part 41，1031 Extension part 42，1032 Air flow channel 1033 Pressure sensor 1，104 Detection end 11，1041 Sealing ring 105 Air leakage flow channel 106 Body structure 12 Adapter block 3 First air flow path 31 Annular groove 32 Second air flow path 421 Open slot 422 Clamping slot 43 First sealing element 51 Second sealing element 52 Fixing part 61 Clamping part 62 Fixing piece 7 Intake valve 8 Exhaust valve 9

[0030] The realization of the object, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiment

[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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope 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, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, 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 the solution where A and B are satisfied simultaneously.

[0034] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the 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 the 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 them. 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 protection scope required by the present utility model.

[0035] The present utility model proposes a gas flow structure, aiming to solve the technical problems of high production and installation accuracy requirements and poor airtightness in the existing technical solutions of the gas flow structure.

[0036] In the embodiments of the present utility model, a gas flow structure is proposed, and the gas flow structure includes:

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

[0038] An adapter block 3, the interior of the adapter block 3 is penetrated to form a first air flow path 31;

[0039] A base 4, the base 4 includes a main body portion 41 and an extension portion 42 extending from the main body portion 41, and the interior of the extension portion 42 is penetrated to form a second air flow path 421;

[0040] Wherein:

[0041] The adapter block 3 is disposed between the pressure sensor 1 and the extension portion 42 of the base 4 through a sealing element, and the first air flow path 31 of the adapter block 3 and the second air flow path 421 of the extension portion 42 are hermetically connected through the sealing element. The detection end 11 of the pressure sensor 1 protrudes into the first air flow path 31 to detect the gas pressure flowing in from the second air flow path 421.

[0042] Inside the electro-pneumatic proportional valve is a closed-loop control system, which mainly consists 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 uses a pressure sensor 1, and the pressure sensor 1 and the gas transmission structure part form a gas flow structure.

[0043] See Figure 2 As shown, the electro-pneumatic proportional valve is provided with a gas flow structure, which includes a pressure sensor 1, an adapter block 3, a base 4, and a sealing element.

[0044] The pressure sensor 1 is welded and fixed to a circuit board 2 and is communicatively connected to the circuit board 2. The pressure sensor 1 detects the gas pressure in the gas path and feeds back the gas pressure value to the circuit board 2.

[0045] The interior of the adapter block 3 is formed with a first air flow path 31. The base 4 includes a main body portion 41 and an extension portion 42 extending from the main body portion 41. The interior of the extension portion 42 is formed with a second air flow path 421. The adapter block 3 is disposed between the pressure sensor 1 and the extension portion 42 of the base 4 in the vertical direction. A sealing element is sleeved around the detection end 11 of the pressure sensor 1. During assembly, the detection end 11 sleeved with the sealing element protrudes into the first air flow path 31 of the adapter block 3 in the axial direction (i.e., the vertical direction). At the same time, the detection end 11 uniformly extrudes the sealing element outward in the axial direction so that the extrusion degree of each part of the sealing element is roughly uniform to prevent the air flow in the first air flow path 31 from diffusing outward through the air leakage channel formed between the detection end 11 and the inner wall of the adapter block 3. Another sealing element is additionally provided in the top flow hole of the second air flow path 421, and the spliced pressure sensor 1 and adapter block 3 are pressed on the upper surface of the extension portion 42 and the sealing element in the vertical direction. The first air flow path 31 of the adapter block 3 and the second air flow path 421 of the extension portion 42 are hermetically connected through the sealing element in the axial direction. Since the adapter block 3 presses the sealing element downward in the horizontal direction, the air flow in the second air flow path 421 can be prevented from diffusing outward at the splicing joint of the adapter block 3 and the extension portion 42 when flowing into the first air flow path 31.

[0046] During the installation of this application, since the adapter block 3 and the pressure sensor 1 are first spliced in the axial direction, it can ensure that the sealing element outside the detection end 11 of the pressure sensor 1 is evenly squeezed in the axial direction. Then, the adapter block 3 is spliced in the axial direction to the extension part 42. Since the adapter block 3 squeezes downward in the transverse direction the sealing element arranged in the top flow channel hole of the second air flow path 421, it can prevent the air flow in the second air flow path 421 from diffusing outward when flowing to the first air flow path 31. Since the sealing element here is squeezed in the transverse direction, during installation, it is not necessary to accurately align the bottom opening of the first air flow path 31 with the top opening of the second air flow path 421 exactly in the middle. It allows for some installation misalignment, as long as it is ensured that the first air flow path 31 and the second air flow path 421 are sealed and connected by the sealing element. The total air flow channel formed by the first air flow path 31 and the second air flow path 421 can have an allowed channel offset at the splicing position of the adapter block 3 and the extension part 42, reducing the accuracy requirement for the transverse positioning of the adapter block 3 and the extension part 42. Therefore, in the gas flow structure, through the assembly and cooperation of the adapter block 3 and the sealing element, while preventing the air flow from diffusing outward, the requirements for the production accuracy and installation accuracy of the parts are reduced, and the detection accuracy of the gas pressure value flowing from the second air flow path 421 into the first air flow path 31 by the detection end 11 of the pressure sensor 1 is improved.

[0047] The technical solution of the present utility model proposes a gas flow structure, which includes: a pressure sensor 1, the pressure sensor 1 includes a detection end 11, and the pressure sensor 1 is fixed to a circuit board 2; an adapter block 3, the interior of the adapter block 3 is penetrated to form a first air flow path 31; a base 4, the base 4 includes a main body part 41 and an extension part 42 extending from the main body part 41, and the interior of the extension part 42 is penetrated to form a second air flow path 421; wherein: the adapter block 3 is arranged between the pressure sensor 1 and the extension part 42 of the base 4 through a sealing element, and the first air flow path 31 of the adapter block 3 and the second air flow path 421 of the extension part 42 are sealed and connected through the sealing element, and the detection end 11 of the pressure sensor 1 protrudes into the first air flow path 31 to detect the gas pressure flowing in from the second air flow path 421. This application installs an adapter block 3 between the pressure sensor 1 and the extension part 42 of the base 4, and seals the splicing gap between the adapter block 3, the pressure sensor 1 and the extension part 42 through a sealing element. While preventing the air flow from diffusing outward, it reduces the requirements for the production accuracy and installation accuracy of the parts, reduces the risk of air leakage caused by inaccurate positioning, improves the stability of signal acquisition of the pressure sensor 1, and enhances the performance of the electro-hydraulic proportional valve.

[0048] Furthermore, an annular groove 32 is provided at the top of the adapter block 3. The sealing element includes a first sealing element 51. The first sealing element 51 is sleeved on the detection end 11 of the pressure sensor 1 and is received in the annular groove 32. The first sealing element 51 is axially extruded by the detection end 11 towards the lateral sides.

[0049] It can be understood that, as shown in Figure 2 In this embodiment, the adapter block 3 can be square or cylindrical, and its specific structure is not limited. An annular groove 32 is recessed at the top of the adapter block 3, and the annular groove 32 communicates with the first air flow path 31. The sealing element includes a first sealing element 51, and the first sealing element 51 can specifically be an O-ring. During installation, first sleeve the first sealing element 51 on the detection end 11 of the pressure sensor 1, and then axially abut the detection end 11 sleeved with the first sealing element 51 in the first air flow path 31 of the adapter block 3 and place the first sealing element 51 in the annular groove 32. By setting the thickness of the first sealing element 51 to be greater than the width of the annular groove 32 in the lateral direction, the first sealing element 51 is axially extruded by the detection end 11 towards the lateral sides, that is, the first sealing element 51 is uniformly flattened axially, so as to prevent the air flow in the first air flow path 31 from diffusing outward through the air leakage channel formed between the detection end 11 and the inner wall of the adapter block 3 and affecting the detection of the gas pressure flowing into the first air flow path 31 by the pressure sensor 1. Since in this embodiment, the pressure sensor 1 and the adapter block 3 are first spliced, it only needs to ensure that the detection end 11 of the pressure sensor 1 is inserted into the first air flow path 31 of the adapter block 3 and the first sealing element 51 is uniformly extruded and sealed, and the installation steps are simple.

[0050] Furthermore, the pressure sensor 1 further includes a body structure 12. The detection end 11 of the pressure sensor 1 extends from the body structure 12, and the bottom surface of the body structure 12 is press-connected to the upper surface of the adapter block 3.

[0051] It is easy to understand that the pressure sensor 1 further includes a body structure 12, and the detection end 11 extends from the body structure 12. The pressure sensor 1 and the adapter block 3 are spliced so that the bottom surface of the body structure 12 of the pressure sensor 1 is press-connected to the upper surface of the adapter block 3. In this way, the bottom surface of the body structure 12 of the pressure sensor 1 and the side surface of the detection end 11 completely surround the annular groove 32. The first sealing element 51 is not only axially extruded by the detection end 11 towards the lateral sides but also limited by the surfaces of each part surrounding the annular groove 32, enhancing the sealing performance after the pressure sensor 1 and the adapter block 3 are spliced.

[0052] Further, an opening groove 422 is provided at the top of the extension portion 42 of the base 4. The sealing element further includes a second sealing element 52, which is disposed in the opening groove 422. The lower surface of the adapter block 3 is pressed against the top surface of the extension portion 42, and the second sealing element 52 is extruded downward by the adapter block 3 in the lateral direction.

[0053] It can be understood that, as Figure 2 shown in this embodiment, an opening groove 422 is recessed at the top of the extension portion 42 of the base 4, and the opening groove 422 communicates with the second air flow path 421. The sealing element further includes a second sealing element 52, and the second sealing element 52 may specifically be an O-ring. During installation, the second sealing element 52 is disposed in the opening groove 422, and the pressure sensor 1 and the adapter block 3 joined together are disposed on the extension portion 42 in the axial direction. The gap at the joint of the adapter block 3 and the extension portion 42 is sealed by the second sealing element 52. Specifically, the adapter block 3 is joined to the extension portion 42 in the axial direction, the lower surface of the adapter block 3 is pressed against the top surface of the extension portion 42, and at the same time, the adapter block 3 extrudes the second sealing element 52 disposed in the opening groove 422 downward in the lateral direction. The first air flow path 31 and the second air flow path 421 are hermetically connected in the axial direction through the second sealing element 52. Since the adapter block 3 extrudes the second sealing element 52 disposed in the opening groove 422 in the lateral direction in this embodiment, partial installation misalignment between the adapter block 3 and the extension portion 42 is allowed during installation, that is, the center of the bottom opening of the first air flow path 31 and the center of the top opening of the second air flow path 421 are not on the same central axis but are offset in the lateral direction. The total air flow channel formed by the first air flow path 31 and the second air flow path 421 is allowed to have a channel offset at the joint of the adapter block 3 and the extension portion 42, and this offset is within the allowable installation tolerance range because the laterally extruded second sealing element 52 can effectively prevent gas from diffusing outward from the offset position. In this way, the requirements for the production precision and installation precision of the parts are reduced, making the installation more convenient and efficient, and at the same time improving the airtightness of the gas flow structure.

[0054] Further, the center of the bottom opening of the first air flow path 31 and the center of the top opening of the second air flow path 421 are located on the same central axis or are offset in the lateral direction.

[0055] It can be understood that, as Figure 2As shown, when the adapter block 3 is crimped onto the extension part 42, the center of the bottom opening of the first air flow path 31 can be aligned with the center of the top opening of the second air flow path 421 for installation, so that the center of the bottom opening of the first air flow path 31 and the center of the top opening of the second air flow path 421 are located on the same central axis. Of course, since the adapter block 3 presses the second sealing element 52 arranged in the opening groove 422 downward in the lateral direction, during installation, it is also possible not to align the center of the bottom opening of the first air flow path 31 with the center of the top opening of the second air flow path 421, but to stagger the center of the bottom opening of the first air flow path 31 and the center of the top opening of the second air flow path 421 in the lateral direction, as long as it is ensured that the first air flow path 31 and the second air flow path 421 are sealed and communicated by the second sealing element 52. Compared with the method that requires center alignment for installation, this method that does not require center alignment greatly reduces the production accuracy and installation accuracy requirements of parts, making production and installation more convenient and efficient.

[0056] In this embodiment, first, the detection end 11 sleeved with the first sealing element 51 is axially abutted against the first air flow path 31 of the adapter block 3 and the first sealing element 51 is placed in the annular groove 32, so that the first sealing element 51 is evenly squeezed by the detection end 11 in the axial direction towards the lateral sides, to prevent the air flow in the first air flow path 31 from diffusing outward from the joint of the pressure sensor 1 and the adapter block 3. Then, the second sealing element 52 is arranged in the opening groove 422 of the extension part 42, the adapter block 3 is axially spliced onto the extension part 42, and the second sealing element 52 is squeezed downward by the adapter block 3 in the lateral direction. Therefore, the air flow in the second air flow path 421 will not diffuse outward from the joint of the adapter block 3 and the extension part 42 when flowing towards the first air flow path 31. Therefore, partial installation misalignment between the adapter block 3 and the extension part 42 is allowed, that is, although the bottom opening of the first air flow path 31 and the top opening of the second air flow path 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 block 3 and the extension part 42. Since the airtightness of the gas flow structure is realized through the axial sealing at the joint of the pressure sensor 1 and the adapter block 3 (that is, the first sealing element 51 is squeezed towards the lateral direction in the axial direction) and the lateral sealing at the joint of the adapter block 3 and the extension part 42 (that is, the second sealing element 52 is squeezed downward in the lateral direction) in the solution of this embodiment, the detection accuracy of the air flow pressure in the first air flow path 31 by the pressure sensor 1 is ensured. At the same time, due to the two-time sealing structure design of the adapter block 3 and the sealing element (axial sealing plus lateral sealing), the accuracy requirement for the lateral positioning between the first air flow path 31 and the second air flow path 421 can be reduced, and the production accuracy requirement and installation accuracy requirement of parts are reduced.

[0057] Further, the gas flow structure further includes: a housing 6; the housing 6 is disposed around the base 4 to form an accommodation cavity; the pressure sensor 1 is communicatively connected to the circuit board 2 and is disposed in the accommodation cavity.

[0058] For easy understanding, please refer Figure 2 As shown, the housing 6 is disposed around the base 4 to form an accommodation cavity inside the housing 6. The pressure sensor 1 is communicatively connected to the circuit board 2 and is disposed in the accommodation cavity. The pressure sensor 1 detects the gas pressure in the gas flow structure and communicatively transmits it to the circuit board 2. The circuit board 2 receives the gas pressure signal transmitted by the pressure sensor 1 and controls the gas pressure and flow rate to achieve continuous and stepless adjustment of the gas pressure.

[0059] Further, a fixing portion 61 extends from the inner surface of the housing 6 into the accommodation cavity. The circuit board 2 is fixed to the fixing portion 61 by a fixing member 7 so that the circuit board 2 is fixed to the housing 6.

[0060] For easy understanding, please refer Figure 2 As shown, a fixing portion 61 extends from the inner surface of the housing 6 into the accommodation cavity. The fixing member 7 fixes the circuit board 2 to the fixing portion 61 so that the circuit board 2 is fixed inside the housing 6. The fixing member 7 can be a screw, and this embodiment does not limit it.

[0061] Further, one of the top of the bottom of the housing 6 and the main body portion 41 of the base 4 is provided with a clamping portion, and the other is provided with a clamping groove. The clamping portion is clamped in the clamping groove to fix the housing 6 to the base 4.

[0062] For easy understanding, please refer Figure 2 As shown, in this embodiment, a clamping portion 62 is protruded from the bottom of the housing 6, and a clamping groove 43 is recessed from the top of the main body portion 41 of the base 4. The housing 6 is stably mounted on the base 4 through the positioning cooperation between the clamping portion 62 and the clamping groove 43. Of course, in other embodiments, the clamping portion can be provided on the top of the main body portion 41 of the base 4, and the clamping groove is provided on the bottom of the housing 6. The structural cooperation between the clamping portion 62 and the clamping groove 43 can be the cooperation between a positioning pin and a groove, and this embodiment does not limit it.

[0063] Further, the gas flow structure further includes an intake valve 8 and an exhaust valve 9. The intake valve 8 and the exhaust valve 9 are disposed on both sides of the extension portion 42, and the intake valve 8 and the exhaust valve 9 are communicatively connected to the circuit board 2.

[0064] For easy understanding, please refer Figure 2As shown, the intake valve 8 and the exhaust valve 9 are respectively arranged on both sides of the extension part 42. The pressure sensor 1 detects the air pressure in the first air flow path 31 and feeds it back to the circuit board 2, and the circuit board 2 judges whether the air pressure meets the set value; when the detected air pressure does not meet the set value, the opening and closing of the intake valve 8 and / or the exhaust valve 9 are controlled to adjust the air pressure in the first air flow path 31 until the air pressure in the first air flow path 31 meets the set value.

[0065] In this embodiment, the circuit board 2 is fixed in the housing 6 by the fixing member 7 to fix the circuit board 2 to the fixing part 61, and the housing 6 is stably installed on the base 4 through the positioning cooperation between the clamping part 62 and the clamping groove 43. Since the airtightness of the gas flow structure is realized by the axial seal at the splicing of the pressure sensor 1 and the adapter block 3 (that is, the first sealing element 51 is axially extruded in the transverse direction) and the transverse seal at the splicing of the adapter block 3 and the extension part 42 (that is, the second sealing element 52 is transversely extruded downward), the detection of the air flow pressure in the first air flow path 31 by the pressure sensor 1 is ensured. At the same time, due to the two-time sealing structure design of the adapter block 3 and the sealing element (axial seal plus transverse seal), the requirement for the transverse positioning accuracy between the first air flow path 31 and the second air flow path 421 can be reduced. Therefore, the requirement for the installation and positioning accuracy of the circuit board 2 on the fixing part 61 and the requirement for the installation and positioning accuracy between the housing 6 and the base 4 can be further reduced, allowing a certain tolerance between the mutually cooperating parts, and further reducing the production accuracy requirement and installation accuracy requirement of the parts.

[0066] The present utility model also proposes an electro-hydraulic proportional valve, and the electro-hydraulic proportional valve includes the gas flow structure as described above. The specific structure of the gas flow structure refers to the above embodiment. Since this electro-hydraulic proportional valve adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0067] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the inventive concept 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 gas circulation structure, comprising: A pressure sensor (1), the pressure sensor (1) comprising a detection end (11), the pressure sensor (1) being fixed to a circuit board (2); An adapter block (3), the interior of the adapter block (3) being connected to form a first airflow path (31); A base (4), the base (4) comprising a main body (41) and an extension portion (42) extending from the main body (41), the extension portion (42) being connected internally to form a second airflow path (421); in: The adapter block (3) is arranged between the pressure sensor (1) and the extension portion (42) of the base (4) through a sealing element, and the first air flow path (31) of the adapter block (3) and the second air flow path (421) of the extension portion (42) are sealed and connected through the sealing element, and the detection end (11) of the pressure sensor (1) protrudes into the first air flow path (31) to detect the pressure of the gas flowing in from the second air flow path (421).

2. The gas flow structure according to claim 1, characterized in that: An annular groove (32) is provided at the top of the adapter block (3), and the sealing element comprises a first sealing element (51). The first sealing element (51) is sleeved on the detection end (11) of the pressure sensor (1) and accommodated in the annular groove (32), and the first sealing element (51) is squeezed by the detection end (11) in the axial direction towards both sides in the lateral direction.

3. The gas flow structure according to claim 2, characterized in that: The pressure sensor (1) further comprises a main body structure (12), the detection end (11) of the pressure sensor (1) is formed by extending from the main body structure (12), and the bottom surface of the main body structure (12) is pressed against the upper surface of the adapter block (3).

4. The gas flow structure according to claim 1, characterized in that: An open groove (422) is provided at the top of the extension portion (42) of the base (4), and the sealing element further includes a second sealing element (52), which is arranged in the open groove (422). The lower surface of the adapter block (3) is pressed against the top surface of the extension portion (42), and the second sealing element (52) is squeezed downward by the adapter block (3) in the lateral direction.

5. The gas flow structure according to claim 1, characterized in that: The center of the bottom opening of the first airflow path (31) and the center of the top opening of the second airflow path (421) are located on the same central axis or are staggered in the lateral direction.

6. The gas flow structure according to claim 1, characterized in that: The gas circulation structure further comprises: a housing (6); The housing (6) is disposed around the base (4) to form a receiving cavity; The pressure sensor (1) is communicatively connected to the circuit board (2) and is accommodated in the accommodating cavity.

7. The gas flow structure according to claim 6, characterized in that: The inner surface of the shell (6) is provided with a fixing portion (61) extending into the accommodating cavity, and the circuit board (2) is fixed to the fixing portion (61) via a fixing member (7) so that the circuit board (2) is fixed to the shell (6).

8. The gas flow structure according to claim 6, characterized in that: One of the bottom of the shell (6) and the top of the main body (41) of the base (4) is provided with a clamping portion, and the other is provided with a clamping groove, and the clamping portion is clamped in the clamping groove to fix the shell (6) to the base (4).

9. The gas circulation structure according to claim 1, characterized in that: The gas circulation structure further comprises an intake valve (8) and an exhaust valve (9), wherein the intake valve (8) and the exhaust valve (9) are arranged on both sides of the extension portion (42), and the intake valve (8) and the exhaust valve (9) are communicatively connected with the circuit board (2).

10. An electric proportional valve, characterized in that: The electric proportional valve comprises the gas flow structure according to any one of claims 1 to 9.

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