A modular cockpit pressure regulating sub-system tee switch

Abstract

The present application relates to the technical field of cabin pressure regulation, and particularly relates to a three-way switch for a modular cabin pressure regulation subsystem. The modular three-way switch mechanism improves the reliability of gas path switching and sealing parts. The installation position is flexible, the assembly process is good, and the three-way switch can be quickly replaced in the field, improving the reliability of gas path switching and sealing. The modular structure makes the installation position more flexible, and the handle can be switched within a range of 40 degrees, making the installation space unrestricted.

Description

Technical Field

[0001] This invention relates to the field of aircraft cabin pressure regulation technology, and more particularly to a three-way switch for a modular cabin pressure regulation subsystem. Background Technology

[0002] The pneumatic cabin pressure regulator in the cabin pressure regulation subsystem needs to have three operating states: on, check, and off, to respectively perform three functions: adjusting cabin pressure as required, checking cabin residual pressure, and checking cabin airtightness. To switch between these three functions, a three-way switch is required to switch the regulating air path within the cabin pressure regulator.

[0003] The three-way switch mechanism on the traditional cockpit pressure regulator uses the rotating and sealing of a conical surface formed by two metal parts to achieve air circuit switching. Due to the influence of the assembly relationship of the parts, it has high requirements for dimensional accuracy, requires the parts to be lapped during the assembly process, has poor manufacturability, and is prone to air leakage failure.

[0004] Due to the limitations of the component structure, handle 2 needs to be rotated when switching the air circuit, and sufficient space must be reserved around the installation location of the three-way switch.

[0005] In traditional three-way switch mechanisms, all parts are separately mounted and fixed on the structural components of the cabin pressure regulator. If a fault such as air leakage or inability to switch properly occurs in the field, the entire cabin pressure regulator needs to be replaced and the faulty product needs to be returned to the factory for repair, resulting in poor field maintainability. Summary of the Invention

[0006] The purpose of this invention is to propose a three-way switch for a modular cockpit pressure regulation subsystem that has high quality reliability, good assembly processability, and can meet the requirements of rapid replacement.

[0007] To solve this technical problem, the technical solution of the present invention is as follows:

[0008] A three-way switch for a modular cabin pressure regulation subsystem includes: a normally open valve assembly 1, a countersunk screw 2, a switch housing 300, a plug 4, a top cover 500, a roller 600, a handle 700, a normally closed valve assembly 8, a valve shaft 9, and a sealing ring 10.

[0009] The switch housing 300 has a hollow inner cavity 304 in the middle. A normally closed air passage 301 and a constantly open air passage 302 are respectively opened on the left and right sides of the hollow inner cavity and communicate with it. A normally open air passage 303 is opened at the lower center of the inner cavity. The normally open valve assembly 1 is disposed in the normally open air passage 303, and the normally closed valve assembly 8 is disposed in the normally closed air passage 301. The upper cover 500 is disposed above the switch housing 300 and is sealed and fixedly connected. The roller 600 passes through the top of the upper cover 500 front and back. The handle 700 is connected to both ends of the roller 600. The upper end of the valve shaft 9 is connected to the middle of the roller 600. The radial connection has a lower end with a spherical end face extending into the hollow inner cavity 304; a normally open air passage spherical groove 305 that mates with the lower end of the valve shaft 9 is provided around the normally open air passage on the lower end face of the hollow inner cavity 304; a normally closed air passage spherical groove 305 of the same shape is provided on the side near the normally closed air passage 301; by rotating the handle 7 to one side, the valve shaft 9 is driven to rotate; when the lower end of the valve shaft 9 is inserted into the normally open air passage spherical groove, it cooperates with the normally closed valve assembly 8 to open the normally closed air passage; when the lower end of the valve shaft 9 is inserted into the normally open air passage spherical groove, it cooperates with the normally open valve assembly 1 to close the normally open air passage.

[0010] In one possible embodiment, the valve shaft 9 includes a shaft body 9-1 with a hollow inner cavity, a preload spring 9-2 compressed within the inner cavity of the shaft body 9-1, and a steel ball 9-3 in contact with the end of the preload spring 9-2; the lower end of the inner cavity of the shaft body 9-1 is constricted, and the steel ball 9-3 is partially exposed at the lower end of the shaft body 9-1.

[0011] In one possible embodiment, the top cover 500 has a mountain-shaped protrusion structure 501, the roller 600 passes through the top of the mountain-shaped protrusion structure 501 of the top cover 500 from front to back, and annular grooves are respectively provided at both ends of the roller 600. The O-ring seal 10 is fitted into the annular groove of the roller 600 to achieve a seal between the roller 600 and the top cover 500.

[0012] In one possible embodiment, one end of the roller 600 is rectangular 601, and correspondingly, the handle 700 is provided with a matching rectangular hole 701 at the connection with the end, which can realize the rotation limit of the handle.

[0013] In one possible embodiment, the normally open valve assembly 1 includes a normally open valve seat 1-1, a normally open valve return spring 1-2, and a normally open valve 1-3. The normally open valve seat 1-1 has a protruding normally open valve seat flow channel at its center. The normally open valve return spring 1-2 is fitted onto the normally open valve seat flow channel. The outer edge of the normally open valve seat 1-1 is fixed to the normally open air passage 303 by external thread engagement. The normally open valve 1-3 is disposed at the top inside the normally open valve seat 1-1, and its bottom end face contacts the normally open valve return spring 1-2. When its top end is in a free state, the normally open air passage is disconnected by the normally open valve return spring 1-2, which is in a compressed state.

[0014] Preferably, the bottom end face of the normally open valve 1-3 is embedded with a rubber sealing structure that matches the flow channel opening of the normally open valve seat 1-1.

[0015] In one possible embodiment, the normally closed valve assembly includes a normally closed valve 8-1, a normally closed valve return spring 8-2, a normally closed valve nut 8-3, and an O-ring seal 8-4; the O-ring seal 8-4 is fitted into an annular groove at the left end of the normally closed valve nut 8-1 to achieve a seal; the normally closed valve nut 8-1 is sealed in a stepped hole on the side wall of the switch housing 300 that communicates with the normally closed air passage 301; the normally closed valve nut 8-3 has a centrally located portion for inserting one end of the normally closed valve 8-1. The normally closed valve nut has an annular boss, and the normally closed valve return spring 8-2 is fitted onto the annular boss of the normally closed valve nut 8-3. The normally closed air passage 301 has an annular boss 306 on its inner side, and the normally closed valve 8-1 has a stepped end face at the other end. One side of the stepped end face contacts the annular boss 306, and the other side contacts the normally closed valve return spring 8-2 in a compressed state. In the free state, the normally closed valve 8-1 disconnects the normally closed air passage through the normally closed valve return spring 8-2 in a compressed state.

[0016] Preferably, a rubber sealing structure is embedded at the mating point between the normally closed valve 8-1 and the annular boss.

[0017] In one possible embodiment, the side wall of the switch housing 300 is provided with a process hole for processing the constant air passage and communicating with the constant air passage, and the process hole is sealed by a plug 4.

[0018] The technical effects of this invention are:

[0019] 1. Modular three-way switch mechanism improves the reliability of gas path switching and sealing. Flexible installation location, excellent assembly process, and rapid field replacement enhance the reliability of gas path switching and sealing. The modular structure allows for greater installation flexibility; the handle can be turned within a 40° range to switch between three gas paths, making installation space unrestricted.

[0020] 2. The use of a metal + non-metal sealing structure improves the reliability of the sealing parts after gas path switching.

[0021] 3. The modular three-way switch can be quickly replaced using a general-purpose wrench, screwdriver, etc.

[0022] 4. Integrating the air circuit switching inside the mechanism reduces the requirements for the dimensional accuracy of the installation structural components.

[0023] The invention described above has good assembly processability, stable and reliable quality, and high field maintainability, which meets the requirements of the cabin pressure regulation subsystem for high reliability and good maintainability of the three-way switch. Attached Figure Description

[0024] Figure 1 This invention proposes a three-way switch structure for a modular cockpit pressure regulation subsystem;

[0025] Figure 2 This is a schematic diagram of the internal structure of a three-way switch for a modular cabin pressure regulation subsystem proposed in this invention;

[0026] Figure 3 This invention proposes a three-way switch internal valve shaft structure for a modular cabin pressure regulation subsystem;

[0027] Figure 4 This invention proposes a cover structure for a three-way switch used in a modular cabin pressure regulation subsystem.

[0028] Figure 5 This invention proposes a roller structure on a three-way switch for a modular cabin pressure regulation subsystem.

[0029] Figure 6 This invention proposes a handle structure for a three-way switch used in a modular cabin pressure regulation subsystem.

[0030] Figure 7 This invention proposes a normally open valve assembly structure on a three-way switch for a modular cabin pressure regulation subsystem.

[0031] Figure 8 This invention proposes a normally closed valve assembly structure for a three-way switch used in a modular cabin pressure regulation subsystem.

[0032] Figure 9 This invention relates to a roller and cover sealing structure for a three-way switch used in a modular cabin pressure regulation subsystem. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0035] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figures 1-9 As shown, a three-way switch for a modular cabin pressure regulation subsystem includes: a normally open valve assembly 1, a countersunk screw 2, a switch housing 300, a plug 4, a top cover 500, a roller 600, a handle 700, a normally closed valve assembly 8, a valve shaft 9, and a sealing ring 10.

[0037] The switch housing 300 has a hollow inner cavity 304 in the middle. A normally closed air passage 301 and a constantly open air passage 302 are respectively opened on the left and right sides of the hollow inner cavity and communicate with it. A normally open air passage 303 is opened at the lower center of the inner cavity. The normally open valve assembly 1 is disposed in the normally open air passage 303, and the normally closed valve assembly 8 is disposed in the normally closed air passage 301. The upper cover 500 is disposed above the switch housing 300 and is sealed and fixedly connected. The roller 600 passes through the top of the upper cover 500 front and back. The handle 700 is connected to both ends of the roller 600. The upper end of the valve shaft 9 is connected to the middle of the roller 600. The radial connection has a lower end with a spherical end face extending into the hollow inner cavity 304; a normally open air passage spherical groove 305 that mates with the lower end of the valve shaft 9 is provided around the normally open air passage on the lower end face of the hollow inner cavity 304; a normally closed air passage spherical groove 305 of the same shape is provided on the side near the normally closed air passage 301; by rotating the handle 7 to one side, the valve shaft 9 is driven to rotate; when the lower end of the valve shaft 9 is inserted into the normally open air passage spherical groove, it cooperates with the normally closed valve assembly 8 to open the normally closed air passage; when the lower end of the valve shaft 9 is inserted into the normally open air passage spherical groove, it cooperates with the normally open valve assembly 1 to close the normally open air passage.

[0038] In one possible embodiment, the valve shaft 9 includes a shaft body 9-1 with a hollow inner cavity, a preload spring 9-2 compressed within the inner cavity of the shaft body 9-1, and a steel ball 9-3 in contact with the end of the preload spring 9-2; the lower end of the inner cavity of the shaft body 9-1 is constricted, and the steel ball 9-3 is partially exposed at the lower end of the shaft body 9-1.

[0039] In one possible embodiment, the top cover 500 has a mountain-shaped protrusion structure 501, the roller 600 passes through the top of the mountain-shaped protrusion structure 501 of the top cover 500 from front to back, and annular grooves are respectively provided at both ends of the roller 600. The O-ring seal 10 is fitted into the annular groove of the roller 600 to achieve a seal between the roller 600 and the top cover 500.

[0040] In one possible embodiment, one end of the roller 600 is rectangular 601, and correspondingly, the handle 700 is provided with a matching rectangular hole 701 at the connection with the end, which can realize the rotation limit of the handle.

[0041] In one possible embodiment, the normally open valve assembly 1 includes a normally open valve seat 1-1, a normally open valve return spring 1-2, and a normally open valve 1-3. The normally open valve seat 1-1 has a protruding normally open valve seat flow channel at its center. The normally open valve return spring 1-2 is fitted onto the normally open valve seat flow channel. The outer edge of the normally open valve seat 1-1 is fixed to the normally open air passage 303 by external thread engagement. The normally open valve 1-3 is disposed at the top inside the normally open valve seat 1-1, and its bottom end face contacts the normally open valve return spring 1-2. When its top end is in a free state, the normally open air passage is disconnected by the normally open valve return spring 1-2, which is in a compressed state.

[0042] Preferably, the bottom end face of the normally open valve 1-3 is embedded with a rubber sealing structure that matches the flow channel opening of the normally open valve seat 1-1.

[0043] In one possible embodiment, the normally closed valve assembly includes a normally closed valve 8-1, a normally closed valve return spring 8-2, a normally closed valve nut 8-3, and an O-ring seal 8-4; the O-ring seal 8-4 is fitted into an annular groove at the left end of the normally closed valve nut 8-1 to achieve a seal; the normally closed valve nut 8-1 is sealed in a stepped hole on the side wall of the switch housing 300 that communicates with the normally closed air passage 301; the normally closed valve nut 8-3 has a centrally located portion for inserting one end of the normally closed valve 8-1. The normally closed valve nut has an annular boss, and the normally closed valve return spring 8-2 is fitted onto the annular boss of the normally closed valve nut 8-3. The normally closed air passage 301 has an annular boss 306 on its inner side, and the normally closed valve 8-1 has a stepped end face at the other end. One side of the stepped end face contacts the annular boss 306, and the other side contacts the normally closed valve return spring 8-2 in a compressed state. In the free state, the normally closed valve 8-1 disconnects the normally closed air passage through the normally closed valve return spring 8-2 in a compressed state.

[0044] Preferably, a rubber sealing structure is embedded at the mating point between the normally closed valve 8-1 and the annular boss.

[0045] In one possible embodiment, the side wall of the switch housing 300 is provided with a process hole for processing the constant air passage and communicating with the constant air passage, and the process hole is sealed by a plug 4.

Claims

1. A three-way switch for a modular cabin pressure regulation subsystem, characterized in that, include: Normally open valve assembly (1), countersunk screw (2), switch housing (300), plug (4), top cover (500), roller (600), handle (700), normally closed valve assembly (8), valve shaft (9), sealing ring (10); The switch housing (300) has a hollow inner cavity (304) in the middle. A normally closed air passage (301) and a constantly open air passage (302) are respectively opened on the left and right sides of the hollow inner cavity and connected to it. A normally open air passage (303) is opened at the lower center of the inner cavity. The normally open valve assembly (1) is disposed in the normally open air passage (303), and the normally closed valve assembly (8) is disposed in the normally closed air passage (301). The upper cover (500) is disposed above the switch housing (300) and is sealed and fixedly connected. The roller (600) passes through the top of the upper cover (500) front and back. The handle (700) is connected to both ends of the roller (600). The upper end of the valve shaft (9) is connected to the roller. The lower end of the valve shaft (9) with a spherical end face extends into the hollow inner cavity (304) at the center radial connection of the valve shaft (600); a normally open air passage spherical groove that cooperates with the lower end of the valve shaft (9) is provided around the normally open air passage on the lower end face of the hollow inner cavity (304); a normally closed air passage spherical groove of the same shape is provided on the side near the normally closed air passage (301); by rotating the handle (700) to one side, the valve shaft (9) is driven to rotate; when the lower end of the valve shaft (9) is inserted into the normally closed air passage spherical groove, it cooperates with the normally closed valve assembly (8) to open the normally closed air passage; when the lower end of the valve shaft (9) is inserted into the normally open air passage spherical groove, it cooperates with the normally open valve assembly (1) to open the normally open air passage. The normally open valve assembly (1) includes a normally open valve seat (1-1), a normally open valve return spring (1-2), and a normally open valve (1-3). The normally open valve seat (1-1) has a protruding normally open valve seat flow channel at its center. The normally open valve return spring (1-2) is fitted onto the normally open valve seat flow channel. The outer edge of the normally open valve seat (1-1) is fixed to the normally open air passage (303) by external thread. The normally open valve (1-3) is located at the top inside the normally open valve seat (1-1), and its bottom end face is flush with the normally open valve return spring. (1-2) Contact, its top end is in a free state, and the normally open air passage is disconnected by the normally open valve return spring (1-2) in a compressed state; the bottom end face of the normally open valve (1-3) is embedded with a rubber sealing structure that cooperates with the flow port of the normally open valve seat (1-1).

2. The three-way switch for a modular cabin pressure regulation subsystem according to claim 1, characterized in that, The valve shaft (9) includes a shaft body (9-1) with a hollow inner cavity, a preload spring (9-2) compressed in the inner cavity of the shaft body (9-1), and a steel ball (9-3) in contact with the end of the preload spring (9-2); the lower end of the inner cavity of the shaft body (9-1) is constricted, and the steel ball (9-3) is partially exposed at the lower end of the shaft body (9-1).

3. A three-way switch for a modular cabin pressure regulation subsystem according to claim 1, characterized in that, The top cover (500) has a mountain-shaped protrusion structure (501). The roller (600) passes through the top of the mountain-shaped protrusion structure (501) of the top cover (500) from front to back. The roller (600) has annular grooves at both ends. The sealing ring (10) is fitted into the annular groove of the roller (600) to achieve a seal between the roller (600) and the top cover (500).

4. A three-way switch for a modular cabin pressure regulation subsystem according to claim 1, characterized in that, One end of the roller (600) is rectangular (601), and a corresponding rectangular hole (701) is provided at the connection between the handle (700) and the end, which can realize the rotation limit of the handle.

5. A three-way switch for a modular cabin pressure regulation subsystem according to claim 1, characterized in that, The normally closed valve assembly (8) includes a normally closed valve (8-1), a normally closed valve return spring (8-2), a normally closed valve nut (8-3), and an O-ring seal (8-4). The O-ring seal (8-4) is fitted into the annular groove at the left end of the normally closed valve nut (8-1) to achieve a seal. The normally closed valve nut (8-1) is sealed in a stepped hole on the side wall of the switch housing (300) that is connected to the normally closed air passage (301). The normally closed valve nut (8-3) has a center for inserting one end of the normally closed valve (8-1) into the valve. The normally closed valve nut has an annular boss, and the normally closed valve return spring (8-2) is fitted onto the annular boss of the normally closed valve nut (8-3); the normally closed air passage (301) has an annular boss (306) on the inner side, and the normally closed valve (8-1) has a stepped end face at the other end. One side of the stepped end face contacts the annular boss (306), and the other side contacts the normally closed valve return spring (8-2) in a compressed state. In the free state, the normally closed valve (8-1) disconnects the normally closed air passage through the normally closed valve return spring (8-2) in a compressed state.

6. A three-way switch for a modular cabin pressure regulation subsystem according to claim 5, characterized in that, A rubber sealing structure is embedded at the mating point between the normally closed valve (8-1) and the annular boss.

7. A three-way switch for a modular cabin pressure regulation subsystem according to claim 1, characterized in that, The switch housing (300) has a process hole on its side wall for processing the constant air passage and communicating with the constant air passage. The process hole is sealed by a plug (4).

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