Large-amplitude variable air volume negative pressure fresh air system and ventilation valve thereof

Abstract

The invention relates to the field of ventilation valves, in particular to a large-amplitude variable air volume negative pressure fresh air system and a ventilation valve thereof.The large-amplitude variable air volume negative pressure fresh air system comprises a film air pipe, a sleeve used for linear sliding and a sleeve ring used for rotating are fixedly bonded to the two ends of the film air pipe correspondingly, and lines with variable pitch threads are pressed on the peripheral wall of the film air pipe; the film air pipe is further sleeved with a reset spring, and the two ends of the reset spring abut against the lantern ring and the casing pipe respectively. And the first adapter ring is rotationally connected with the lantern ring in a sealed and sleeved mode, a gear ring is arranged on the periphery of the outer wall of the first adapter ring, a motor is assembled on the outer wall of the lantern ring, and the motor drives the lantern ring to rotate by being meshed with the gear ring. According to the novel ventilation valve technology that the valve body and the valve element are made of light and thin flexible materials and are integrated, a transmission valve plate type valve element and part of a shell are replaced, and the ventilation valve is applied to a fresh air system with the large caliber and the large-amplitude variable air volume; the material cost of the equipment is reduced, the dead weight of the equipment is reduced, and the flow adjusting precision and stability of the equipment are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of ventilation valves, and in particular to a large-volume variable air volume negative pressure fresh air system and its ventilation valve. Background Technology

[0002] Existing fresh air systems generally use variable frequency fans in conjunction with air volume regulating valves to regulate air volume. The air exchange rate in a typical laboratory is more than 12 times. However, when it is necessary to simulate aerosol dispersion in the environment, the excessively rapid air exchange rate will cause aerosols in the air to be quickly expelled. In this case, the only way to conduct the test is to close the supply and exhaust air sealing valves. However, this will cause the test chamber to lose negative pressure and there is a risk of pollutant leakage.

[0003] Furthermore, the opening and closing of ventilation valves in commercially available fresh air systems is achieved by deflecting a plate-shaped valve core inside the valve. For small fresh air systems, this has the advantages of simple equipment structure and stable performance. However, for large fresh air systems, the structure of this type of ventilation valve has an upper limit in terms of size. For example, if the ratio of the diameter to the thickness of the plate-shaped valve core increases significantly, the structural strength and rigidity of the valve core will be greatly weakened and it will be prone to deformation. Also, when the airflow passes over the edge of the plate-shaped valve core, it is easy to cause eddies that cause the valve core to vibrate. In addition to affecting the service life of the ventilation valve structure, it will also affect the control accuracy of the ventilation valve on the fresh air flow.

[0004] Therefore, in order to solve the above problems, a large-volume negative pressure fresh air system and its ventilation valve are proposed. Summary of the Invention

[0005] In view of the problem that the air exchange volume adjustment range of the above-mentioned or existing fresh air systems is difficult to meet the requirements of simulated aerosol dispersion tests, and the problem that medium and large diameter valve plate deflection control ventilation valves are prone to eddy currents caused by airflow passing over the valve plate edge, resulting in valve core vibration, which reduces the service life of the ventilation valve structure and the flow control accuracy, this invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a large-volume negative pressure fresh air system and its ventilation valve.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a large-volume negative pressure fresh air system, comprising a large-volume ventilation valve and a small-volume ventilation valve connected in parallel and then connected in series between a static pressure box and a filter; the static pressure box is connected to the fresh air system fan equipment; the fan equipment is connected to an oxygen generator; and the filter is connected to the air outlet; the large-volume ventilation valve is responsible for regulating the air volume of the fresh air system under normal conditions, and the small-volume ventilation valve is responsible for regulating the air volume during simulated aerosol dispersion tests.

[0008] A ventilation valve includes: a diaphragm duct, with a sleeve for linear sliding and a collar for rotation fixedly bonded to both ends, and the peripheral wall of the diaphragm duct is pressed with a variable pitch thread pattern; a return spring is also sleeved on the outside of the diaphragm duct, and the two ends of the return spring abut against the collar and the sleeve, respectively. A first adapter ring is rotatably and sealingly connected to a collar. A toothed ring is provided around the outer wall of the first adapter ring. A motor is mounted on the outer wall of the collar, and the motor drives the collar to rotate through the meshing toothed ring. The second adapter ring is slidably connected to the sleeve in a sealing manner. A guide rod is fixedly connected between the outer walls of the first adapter ring and the second adapter ring, parallel to their axes. The end of the sleeve near the adapter ring is slidably connected to the guide rod.

[0009] In a preferred embodiment of the ventilation valve of the present invention, the thin-film duct, collar, sleeve, adapter ring one and adapter ring two are coaxial, and the guide rods are arranged in a ring array about the adapter ring one.

[0010] In a preferred embodiment of the ventilation valve of the present invention, a metal gasket is fitted to the inner wall of the collar, and the two sides of the gasket are curled and embedded in the inner wall of the collar. Both ends of the exposed surface of the gasket are pressed with arc-shaped grooves, and the arc axis of the grooves is coaxial with the axis of the collar.

[0011] In a preferred embodiment of the ventilation valve of the present invention, the gaskets are arranged in a ring array about the collar, and a retaining ring and a sealing ring are coaxially sleeved around the outer wall of the first adapter ring through a shallow groove. The retaining ring has a circular cross-section and is engaged between the first adapter ring and the groove on the gasket. The sealing ring fits into another groove on the gasket and the inner wall of the collar.

[0012] In a preferred embodiment of the ventilation valve of the present invention, one end of the sleeve is fixedly and sealed to the diaphragm duct, and the other end extends toward the collar.

[0013] In a preferred embodiment of the ventilation valve of the present invention, the second adapter ring is slidably sleeved with the outer wall of the sleeve, and a second sealing ring is provided between the sleeve and the second adapter ring.

[0014] In a preferred embodiment of the ventilation valve of the present invention, the pitch of the texture on the membrane duct gradually decreases from both ends of the membrane duct toward the middle.

[0015] In a preferred embodiment of the ventilation valve of the present invention, the outer walls of both the first and second transition rings are provided with annular reinforcing ribs for fixing clamps when connecting pipes.

[0016] As a preferred embodiment of the ventilation valve of the present invention, wherein: the outer walls of the sleeve, the first adapter ring and the second adapter ring are all integrally injection molded with connecting ears along their radial direction, and are sleeved with the guide rod through the connecting ears, wherein the connecting ears on the first adapter ring and the second adapter ring are threadedly locked with the guide rod.

[0017] The beneficial effects of the large-volume variable air volume negative pressure fresh air system and its ventilation valve of the present invention are as follows: 1. The fresh air system of the present invention has two sets of regulating valves, which are compatible with normal air volume and low air volume negative pressure regulation scenarios. It can fully meet the fresh air needs of laboratories in special scenarios. It can be used in fixed and mobile biosafety laboratories, training rooms, etc., and is equipped with an oxygen generator to supplement oxygen at low air volume to prevent personnel from suffocating due to lack of oxygen.

[0018] 2. The present invention provides a novel ventilation valve technology that integrates the valve body and valve core using lightweight and flexible materials, replacing the transmission valve plate valve core and part of the outer shell. When applied to large-diameter, large-volume fresh air systems, the material cost of the equipment is reduced, the weight of the equipment is reduced, and the flow regulation accuracy and stability of the equipment are greatly improved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the ventilation valve.

[0021] Figure 2 for Figure 1 A structural diagram from another perspective.

[0022] Figure 3 for Figure 1 A structural sectional view.

[0023] Figure 4 for Figure 3 An exploded view of the local structure.

[0024] Figure 5 for Figure 4 An exploded view of the local structure.

[0025] Figure 6 This is a schematic diagram of the workflow from the air inlet to the air outlet of a large variable air volume negative pressure fresh air system.

[0026] Figure 7 This is a schematic diagram of the workflow from the exhaust port to the outlet of a large variable air volume negative pressure fresh air system.

[0027] In the diagram: 100, membrane duct; 1001, texture; 101, sleeve; 102, collar; 103, return spring; 104, adapter ring one; 105, adapter ring two; 106, gear ring; 107, motor; 108, guide rod; 109, connecting ear; 110, gasket; 1101, groove; 111, snap ring; 112, sealing ring one; 113, sealing ring two; 114, reinforcing rib. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Example 1, referring to Figure 6 and Figure 7 This embodiment provides a large-volume negative pressure fresh air system, consisting of a high-volume ventilation valve and a low-volume ventilation valve connected in parallel and then connected in series between a static pressure box and a filter. The static pressure box is connected to the fresh air system fan equipment, the fan equipment is connected to an oxygen generator, and the filter is connected to the air outlet. The high-volume ventilation valve is responsible for regulating the air volume under normal conditions of the fresh air system, while the low-volume ventilation valve is responsible for regulating the air volume during simulated aerosol dispersion experiments. The two sets of regulating valves are compatible with normal air volume and low-volume negative pressure regulation scenarios, which can fully meet the fresh air needs of laboratories in special scenarios. It can be used in fixed and mobile biosafety laboratories, training rooms, etc., and is equipped with an oxygen generator to supplement oxygen at low air volume to prevent personnel from suffering from hypoxia and suffocation.

[0030] Example 2, refer to Figures 1-5 This embodiment provides a ventilation valve that achieves lightweight design and high stability in flow control for large-diameter ventilation valves.

[0031] refer to Figure 1 The main components of this invention include a thin-film duct 100, a first adapter ring 104, a second adapter ring 105, etc., for reference. Figure 3The membrane duct 100 has a sleeve 101 for linear sliding and a collar 102 for rotation fixedly bonded to both ends. The peripheral wall of the membrane duct 100 is pressed with a variable pitch thread pattern 1001. A return spring 103 is also sleeved on the outside of the membrane duct 100, and the two ends of the return spring 103 abut against the collar 102 and the sleeve 101 respectively. A first adapter ring 104 is sealed and rotatably sleeved with the collar 102. A toothed ring 106 is provided around the outer wall of the first adapter ring 104. A motor 107 is assembled on the outer wall of the collar 102, and the motor 107 drives the collar 102 to rotate through the meshing toothed ring 106. A second adapter ring 105 is sealed and slidably sleeved with the sleeve 101. A guide rod 108 is fixedly connected between the outer walls of the first adapter ring 104 and the second adapter ring 105 parallel to their axis. The end of the sleeve 101 near the collar 102 is slidably connected to the guide rod 108.

[0032] Specifically, the membrane duct 100, collar 102, sleeve 101, adapter ring one 104, and adapter ring two 105 are coaxial, and the guide rod 108 is arranged in a ring array about the adapter ring one 104. The outer walls of adapter ring one 104 and adapter ring two 105 are provided with annular reinforcing ribs 114 for fixing clamps when connecting pipes. The outer walls of sleeve 101, adapter ring one 104, and adapter ring two 105 are integrally injection molded with connecting ears 109 along their radial direction, which are sleeved with the guide rod 108 through the connecting ears 109. The connecting ears 109 on adapter ring one 104 and adapter ring two 105 are threadedly locked with the guide rod 108. The gear ring 106 is made of anodized aluminum alloy material, and the output shaft of motor 107 is connected to a gear that meshes with the gear ring 106.

[0033] This invention provides a novel ventilation valve technology that integrates a valve body and valve core using lightweight, flexible materials. Its core component is a thin-film duct 100. A strip of lightweight, flexible material is pre-textured with a pattern 1001 through hot pressing, and then cut to an appropriate length and connected end-to-end to form a circular tube. The thin-film duct 100 functions by rotating one end relative to the other, causing the middle section of the duct to twist and converge, resulting in an hourglass shape that is wider at both ends and narrower in the middle. The degree of convergence in the middle section of the duct is controlled by adjusting the rotation angle of the rotating end, thereby controlling the minimum flow area through which air can pass. When the rotation angle of the rotating end of the duct is zero, the flow area is maximized. When the rotating end of the duct is rotated until the middle section of the duct is completely converged and compressed, the blockage in the middle section of the duct is considered a valve closure.

[0034] To achieve the target function of the membrane duct 100, the present invention also relates to the following technical details: Firstly, when one end of the membrane duct 100 is rotated relative to the other end, the middle of the membrane duct 100 will be constricted, which will shorten its length. Therefore, the length of the membrane duct 100 is dynamic when the flow rate is adjusted. refer to Figure 1 and Figure 2 In the diagram, both adapter ring 104 and adapter ring 105 are used to connect to the ductwork in the fresh air system. Therefore, adapter ring 104 and adapter ring 105 are relatively stationary. Taking adapter ring 104 as the reference frame, the collar 102 at one end of the membrane duct 100 rotates relative to adapter ring 104, while the other end of the membrane duct 100 slides linearly relative to the axis of adapter ring 104. Figure 3 Taking the perspective as an example, when the motor 107 drives the collar 102 and one end of the membrane duct 100 to rotate counterclockwise through the gear and gear ring 106, causing the middle of the membrane duct 100 to tighten and converge, the sleeve 101 at the left end of the membrane duct 100 will move adaptively to the right under the guidance of the guide rod 108 and compress the return spring 103. When the motor 107 reverses, the convergence in the middle of the membrane duct 100 will expand under the push of the return spring 103, and at the same time push the sleeve 101 to slide to the left. Secondly, when one end of the membrane duct 100 rotates relative to the other end, the process of tightening and converging in the middle is guided in an orderly manner by the texture 1001 with variable pitch. During this process, the part of the side wall of the membrane duct 100 with the texture 1001 imprinted on it will be more likely to be folded and twisted. Therefore, when the texture 1001 is designed to be uniform and regular, it can guide the membrane duct 100 from disordered twisting to relatively ordered twisting, making the folds on the inner wall of the membrane duct 100 regular and streamlined. This helps to reduce flow resistance and eddies when the airflow passes through the membrane duct 100, and reduce the vibration of the membrane duct 100. Depend on Figure 3 It can be seen that the pitch of the texture 1001 on the membrane duct 100 gradually decreases from both ends of the membrane duct 100 toward the middle. When the membrane duct 100 is twisted into an hourglass shape according to the target design, the wrinkles generated by the twisting are most concentrated in the middle of the membrane duct 100 and gradually spread out to both ends. Based on this intuitive performance, the pitch of the texture 1001 is also designed to gradually decrease from one end of the membrane duct 100 toward the middle, and then rapidly increase from the middle of the membrane duct 100 toward the other end. Third, since the end of the large-diameter membrane duct 100 needs to rotate, a rotation support structure is required. This invention adopts a technique of sacrificing friction consumables to provide rotation support for the collar 102 at the end of the membrane duct 100. refer to Figure 4 and Figure 6A metal gasket 110 is fitted to the inner wall of the collar 102, and the two sides of the gasket 110 are curled and embedded in the inner wall of the collar 102. Both ends of the exposed surface of the gasket 110 are pressed with arc-shaped grooves 1101. The arc axis of the groove 1101 is coaxial with the axis of the collar 102. The gaskets 110 are arranged in a ring array about the collar 102. A retaining ring 111 and a sealing ring 112 are coaxially sleeved around the outer wall of the transition ring 104 through a shallow groove. The retaining ring 111 has a circular cross-section and is engaged between the groove 1101 on the transition ring 104 and the gasket 110. The sealing ring 112 is fitted to another groove 1101 on the gasket 110 and the inner wall of the collar 102.

[0035] Fourth, one end of the sleeve 101 is fixedly and sealed to the membrane duct 100, and the other end extends toward the collar 102. The transition ring 105 is slidably sleeved with the outer wall of the sleeve 101, and a sealing ring 113 is provided between the sleeve 101 and the transition ring 105, which can reduce the size of the equipment.

[0036] In summary, the present invention provides a novel ventilation valve technology that integrates the valve body and valve core using lightweight and flexible materials, replacing the transmission valve plate valve core and part of the outer shell. When applied to large-diameter, high-volume fresh air systems, the material cost of the equipment is reduced, the weight of the equipment is reduced, and the flow regulation accuracy and stability of the equipment are greatly improved.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A large-volume variable air volume negative pressure fresh air system, characterized in that: The system consists of a large-volume ventilation valve and a small-volume ventilation valve connected in parallel and then connected in series between the static pressure box and the filter. The static pressure box is connected to the fresh air system fan equipment, the fan equipment is connected to the oxygen generator, and the filter is connected to the air outlet. The high-volume ventilation valve is responsible for regulating the air volume under normal conditions of the fresh air system, while the low-volume ventilation valve is responsible for regulating the air volume during simulated aerosol dispersion tests.

2. A ventilation valve, characterized in that: A thin film duct (100) has a sleeve (101) for linear sliding and a collar (102) for rotation fixedly bonded to both ends. The peripheral wall of the thin film duct (100) is pressed with a variable pitch thread (1001). A return spring (103) is also sleeved on the outside of the thin film duct (100), and the two ends of the return spring (103) abut against the collar (102) and the sleeve (101) respectively. The first adapter ring (104) is sealed and rotatedly connected with the collar (102). A toothed ring (106) is provided around the outer wall of the first adapter ring (104). A motor (107) is assembled on the outer wall of the collar (102), and the motor (107) drives the collar (102) to rotate by meshing with the toothed ring (106). The second adapter ring (105) is sealed and slidably connected to the sleeve (101). A guide rod (108) is fixedly connected between the outer walls of the first adapter ring (104) and the second adapter ring (105) parallel to their axis. The end of the sleeve (101) near the collar (102) is slidably connected to the guide rod (108).

3. The ventilation valve as described in claim 2, characterized in that: The thin-film duct (100), collar (102), sleeve (101), adapter ring one (104) and adapter ring two (105) are coaxial, and the guide rod (108) is arranged in a ring array about the adapter ring one (104).

4. The ventilation valve as described in claim 2, characterized in that: A metal gasket (110) is fitted to the inner wall of the collar (102), and the two sides of the gasket (110) are curled and embedded in the inner wall of the collar (102). Both ends of the exposed surface of the gasket (110) are pressed with arc-shaped grooves (1101), and the arc axis of the groove (1101) is coaxial with the axis of the collar (102).

5. The ventilation valve as described in claim 4, characterized in that: The gaskets (110) are arranged in a ring array about the collar (102). The outer wall of the first adapter ring (104) is coaxially sleeved with a snap ring (111) and a sealing ring (112) through a shallow groove. The snap ring (111) has a circular cross-section and is engaged between the first adapter ring (104) and the groove (1101) on the gasket (110). The sealing ring (112) fits against another groove (1101) on the gasket (110) and the inner wall of the collar (102).

6. The ventilation valve as described in claim 2, characterized in that: One end of the sleeve (101) is fixedly and sealed to the membrane duct (100), and the other end extends toward the collar (102).

7. The ventilation valve as described in claim 6, characterized in that: The second adapter ring (105) is slidably sleeved with the outer wall of the sleeve (101), and a second sealing ring (113) is provided between the sleeve (101) and the second adapter ring (105).

8. The ventilation valve as described in claim 2, characterized in that: The pitch of the texture (1001) on the membrane duct (100) gradually decreases from both ends of the membrane duct (100) toward the middle.

9. The ventilation valve as described in claim 2, characterized in that: Both the first adapter ring (104) and the second adapter ring (105) have annular reinforcing ribs (114) protruding from their outer walls for fixing clamps when connecting pipes.

10. The ventilation valve as described in claim 2, characterized in that: The outer walls of the sleeve (101), adapter ring one (104) and adapter ring two (105) are integrally injection molded with connecting ears (109) along their radial direction. The connecting ears (109) are sleeved with the guide rod (108), and the connecting ears (109) on adapter ring one (104) and adapter ring two (105) are threadedly locked with the guide rod (108).

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