Fresh air constant pressure device and fresh air system

Abstract

The present invention provides a fresh air constant pressure device and a fresh air system, which relate to the field of fresh air technology. The fresh air constant pressure device includes a static pressure box and a self-powered constant pressure mechanism. An air inlet and an air outlet are respectively provided at both ends of the static pressure box. The air inlet is used to connect to the fresh air duct, and the air outlet is used to connect to the return air duct. The self-powered constant pressure mechanism is arranged in the static pressure box and divides the static pressure box into a high-pressure chamber and a low-pressure chamber. The air inlet is connected to the high-pressure chamber, and the air outlet is connected to the low-pressure chamber. The self-powered constant pressure mechanism is used to connect the high-pressure chamber and the low-pressure chamber when the pressure difference between the high-pressure chamber and the low-pressure chamber reaches a preset value. Compared with the prior art, the fresh air constant pressure device provided by the present invention can automatically adjust the pressure difference between the fresh air duct and the return air duct, and automatically discharge the excess fresh air to the return air duct, so that the fresh air system is more energy-saving and energy waste is avoided.

Description

Technical Field

[0001] The present invention relates to the field of fresh air technology, and in particular to a fresh air constant pressure device and a fresh air system. Background Art

[0002] The fresh air system is a new type of environmentally friendly appliance that keeps the indoor air clean and fresh at all times. In the prior art, the fresh air ventilator usually supplies air through the fresh air duct and then exhausts it through the exhaust duct. The fresh air is preheated or precooled after passing through the fresh air ventilator, thereby achieving the purpose of energy saving. This model is set up under the condition of full load operation of the room, but when the indoor working conditions change, for example, when one or more rooms are not in use, the exhaust air of the unused room will pass through the fresh air ventilator to exchange heat with the fresh air, thereby deviating from the calculated working conditions and causing an increase in the system load. In addition, the air supply volume of the existing fresh air duct is determined by the power of the air supply fan. When the indoor conditions change, for example, when one or more rooms close the air supply port, there will be excess fresh air in the fresh air duct and the air supply pressure will increase. This part of the excess fresh air will still be processed by the fresh air ventilator and finally discharged from the exhaust duct, resulting in energy waste.

[0003] Furthermore, there is a method of discharging excess fresh air by setting a pressure difference bypass pipe between the fresh air duct and the return air duct. However, in the prior art, this is usually adjusted by manual valves, which is very inconvenient and has poor adjustment accuracy.

[0004] In view of this, it is particularly important to design and manufacture a fresh air constant pressure device that can automatically adjust the pressure difference between the fresh air duct and the return air duct and automatically discharge the excess fresh air to the return air duct. Summary of the invention

[0005] The object of the present invention is to provide a fresh air constant pressure device, which can automatically adjust the pressure difference between the fresh air duct and the return air duct, and automatically discharge the excess fresh air to the return air duct, so as to make the fresh air system more energy-efficient.

[0006] Another object of the present invention is to provide a fresh air system that can automatically exhaust excess fresh air, thereby saving energy and being environmentally friendly.

[0007] The present invention is achieved by adopting the following technical solutions.

[0008] On the one hand, the present invention provides a fresh air constant pressure device, including a static pressure box and a self-powered constant pressure mechanism, wherein an air inlet and an air outlet are respectively provided at both ends of the static pressure box, the air inlet is used to connect to a fresh air duct, and the air outlet is used to connect to a return air duct, the self-powered constant pressure mechanism is arranged in the static pressure box and divides the static pressure box into a high-pressure chamber and a low-pressure chamber, the air inlet is connected to the high-pressure chamber, and the air outlet is connected to the low-pressure chamber, and the self-powered constant pressure mechanism is used to connect the high-pressure chamber and the low-pressure chamber when the pressure difference between the high-pressure chamber and the low-pressure chamber reaches a preset value.

[0009] Furthermore, the self-powered constant pressure mechanism includes a mounting shell and a conducting component, the mounting shell is arranged in the middle of the static pressure box, and an air guide hole is opened on the mounting shell, the two ends of the air guide hole are respectively connected to the high-pressure chamber and the low-pressure chamber, and the conducting component is arranged in the air guide hole, and is used to conduct the air guide hole according to the pressure difference between the high-pressure chamber and the low-pressure chamber.

[0010] Furthermore, the conduction component includes a stop plate and a gravity block, the stop plate is arranged in the air guide hole and cooperates with the air guide hole, and the top end of the stop plate is hinged to the mounting shell, the gravity block is arranged at the bottom end of the stop plate, and the stop plate is used to block the air guide hole under the action of the gravity block.

[0011] Furthermore, the conduction component includes a stop plate and an elastic member, the stop plate is arranged in the air guide hole and cooperates with the air guide hole, and one end of the stop plate is hinged to the mounting shell, and the elastic member is arranged between the mounting shell and the stop plate, and is used to provide an elastic force to the stop plate to rotate toward the direction of the high-pressure chamber.

[0012] Furthermore, there are two conduction components, and the mounting shell is provided with two wind guide holes distributed perpendicular to the air inlet direction, and the two conduction components are arranged in the two wind guide holes in a one-to-one correspondence.

[0013] Furthermore, a wind shield is also provided in the high-pressure chamber, and the wind shield is arranged between the mounting shell and the air inlet. The wind shield is arranged perpendicular to the air inlet direction and opposite to the air inlet, so as to block the airflow entering from the air inlet.

[0014] Furthermore, the orthographic projection size of the wind shield in the wind inlet direction is larger than the size of the air inlet.

[0015] Furthermore, the air inlet is provided with an air inlet duct, and the air outlet is provided with an air exhaust duct, the air inlet duct is connected to the fresh air duct, and the air exhaust duct is connected to the return air duct.

[0016] Furthermore, a pressure difference detection pipeline is provided on the static pressure box, and the pressure difference detection pipeline is connected with the high-pressure chamber and the low-pressure chamber respectively. A pressure gauge is also provided on the pressure difference detection pipeline for detecting the pressure difference between the high-pressure chamber and the low-pressure chamber.

[0017] On the other hand, the present invention provides a fresh air system, including a fresh air duct, a return air duct and the aforementioned fresh air constant pressure device, the fresh air constant pressure device includes a static pressure box and a self-powered constant pressure mechanism, the two ends of the static pressure box are respectively provided with an air inlet and an air outlet, the self-powered constant pressure mechanism is arranged in the static pressure box and divides the static pressure box into a high-pressure chamber and a low-pressure chamber, the air inlet is connected to the high-pressure chamber, the air outlet is connected to the low-pressure chamber, and the self-powered constant pressure mechanism is used to conduct the high-pressure chamber and the low-pressure chamber according to the pressure difference between the high-pressure chamber and the low-pressure chamber. The air inlet is connected to the fresh air duct, and the air outlet is connected to the return air duct.

[0018] The present invention has the following beneficial effects:

[0019] The present invention provides a fresh air constant pressure device, which sets a self-powered constant pressure mechanism in the static pressure box. When the pressure difference between the high-pressure chamber and the low-pressure chamber is too large, the self-powered constant pressure mechanism conducts the high-pressure chamber and the low-pressure chamber, so that the pressure difference between the high-pressure chamber and the low-pressure chamber is maintained within a certain range, so that when there is too much fresh air in the fresh air duct, the air pressure in the high-pressure chamber increases, and after reaching a certain value, the pressure is released into the low-pressure chamber, so that the excess fresh air is discharged into the return air duct. Compared with the prior art, the fresh air constant pressure device provided by the present invention can automatically adjust the pressure difference between the fresh air duct and the return air duct, and automatically discharge the excess fresh air to the return air duct, making the fresh air system more energy-efficient and avoiding energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the overall structure of a fresh air constant pressure device provided in the first embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the partial structure of a fresh air constant pressure device provided in the first embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a fresh air constant pressure device provided in a second embodiment of the present invention;

[0024] Figure 4 This is a schematic structural diagram of a fresh air system provided in the third embodiment of the present invention.

[0025] Icons: 100-Fresh air constant pressure device; 110-Static pressure box; 111-Air inlet; 113-Exhaust outlet; 115-Air inlet duct; 117-Exhaust duct; 130-Self-powered constant pressure mechanism; 131-Mounting shell; 133-Conduction component; 1331-Stop plate; 1333-Gravity block; 1335-Elastic piece; 135-Air guide hole; 150-Wind shield; 170-Pressure difference detection pipeline; 171-Pressure gauge; 200-Fresh air system; 210-Fresh air duct; 230-Return air duct. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the inventive product is usually placed when in use, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] As disclosed in the background technology, in the fresh air system, the existing pressure difference regulating device is usually implemented by setting a manual valve on the pressure difference bypass pipeline. When the operator finds that the pressure in the fresh air system is too high or learns that the air outlet on the load end is partially closed, the pressure difference bypass pipeline is manually opened to discharge the excess fresh air to the return air duct. This control method is very troublesome, and it is difficult to control the opening of the valve, and it is difficult to ensure that the pressure in the fresh air duct can be kept constant within a certain range.

[0032] The present invention provides a fresh air constant pressure device, which can automatically adjust the pressure difference between the fresh air duct and the return air duct, and automatically discharge the excess fresh air to the return air duct, so that the fresh air system is more energy-efficient.

[0033] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0034] First embodiment

[0035] See also Figure 1 and Figure 2 In this embodiment, a fresh air constant pressure device 100 is arranged between the fresh air duct 210 and the return air duct 230 in the fresh air system 200. It can automatically adjust the pressure difference between the fresh air duct 210 and the return air duct 230, and automatically discharge the excess fresh air to the return air duct 230, so that the fresh air system 200 is more energy-efficient.

[0036] The fresh air constant pressure device 100 provided in this embodiment includes a static pressure box 110 and a self-powered constant pressure mechanism 130. An air inlet 111 and an air outlet 113 are respectively provided at both ends of the static pressure box 110. The air inlet 111 is used to connect to the fresh air duct 210, and the air outlet 113 is used to connect to the return air duct 230. The self-powered constant pressure mechanism 130 is arranged in the static pressure box 110 and divides the static pressure box 110 into a high-pressure chamber and a low-pressure chamber. The air inlet 111 is connected to the high-pressure chamber, and the air outlet 113 is connected to the low-pressure chamber. The self-powered constant pressure mechanism 130 is used to connect the high-pressure chamber and the low-pressure chamber when the pressure difference between the high-pressure chamber and the low-pressure chamber reaches a preset value.

[0037] In this embodiment, the static pressure box 110 is in a rectangular shape, with an air inlet 111 and an air outlet respectively opened at both ends. The self-powered constant pressure mechanism 130 is arranged in the middle of the static pressure box 110 and divides the static pressure box 110 into a high-pressure chamber and a low-pressure chamber of approximately equal volume. The high-pressure chamber is connected to the fresh air duct 210, and the low-pressure chamber is connected to the return air duct 230. Under normal circumstances, the pressure difference between the high-pressure chamber and the low-pressure chamber is not large. The self-powered constant pressure mechanism 130 blocks the high-pressure chamber and the low-pressure chamber, so that the fresh air duct 210 and the return air duct 230 are not connected, and the fresh air duct 210 and the return air duct 230 supply air normally; because the fresh air duct 210 0 is only related to the power of the air supply fan. When the load end of the fresh air system 200 is abnormal or the fresh air outlet is partially closed, there will be too much fresh air in the fresh air duct 210, and the pressure in the fresh air duct 210 will increase, while the pressure in the return air duct 230 will not change much. When the fresh air in the fresh air duct 210 increases to a certain extent, the self-powered constant pressure mechanism 130 will connect the high-pressure chamber and the low-pressure chamber to achieve the pressure relief function, and discharge the excess fresh air in the fresh air duct 210 into the return air duct 230, so as to prevent this part of the fresh air from entering the subsequent fresh air ventilation system, and avoid energy waste caused by excessive air supply pressure.

[0038] In this embodiment, the air inlet 111 is provided with an air inlet duct 115, and the air outlet 113 is provided with an exhaust duct 117. The air inlet duct 115 is connected to the fresh air duct 210, and the exhaust duct 117 is connected to the return air duct 230. By additionally setting up the exhaust duct 117 and connecting the air inlet duct 115, the fresh air constant pressure device 100 can be directly installed in a normal fresh air system 200 without adjusting the positions of the fresh air duct 210 and the return air duct 230, thereby improving the adaptability of the fresh air constant pressure device 100.

[0039] The self-powered constant pressure mechanism 130 includes a mounting shell 131 and a conducting component 133. The mounting shell 131 is arranged in the middle of the static pressure box 110, and a wind guide hole 135 is opened on the mounting shell 131. The two ends of the wind guide hole 135 are respectively connected to the high-pressure chamber and the low-pressure chamber. The conducting component 133 is arranged in the wind guide hole 135, and is used to conduct the wind guide hole 135 according to the pressure difference between the high-pressure chamber and the low-pressure chamber.

[0040] In this embodiment, the mounting shell 131 is provided with two air guide holes 135 distributed perpendicularly to the air inlet direction, and there are also two conducting components 133, which are arranged one by one in the two air guide holes 135. Specifically, the air guide holes 135 are arranged in the up-down direction, and the two conducting components 133 are arranged in the two air guide holes 135 in sequence.

[0041] The conduction component 133 includes a stop plate 1331 and a gravity block 1333. The stop plate 1331 is arranged in the wind guide hole 135 and cooperates with the wind guide hole 135, and the top end of the stop plate 1331 is hinged to the mounting shell 131. The gravity block 1333 is arranged at the bottom end of the stop plate 1331. The stop plate 1331 is used to block the wind guide hole 135 under the action of the gravity block 1333.

[0042] In this embodiment, the gravity block 1333 is an iron ball, which is installed at the bottom of the stop plate 1331, so that the stop plate 1331 is pulled under normal circumstances, so that the stop plate 1331 is in a vertical state and blocks the air guide hole 135. Of course, the gravity block 1333 can also be other spherical objects such as a copper ball and a lead ball. In addition, the gravity block 1333 can also be other shapes such as a rectangular body and a sheet, which are not specifically limited here.

[0043] It should be noted that, in this embodiment, the mounting shell 131 is rectangular, and the air guide hole 135 is also rectangular. The shape of the stop plate 1331 matches the shape of the air guide hole 135. When the pressure difference between the high-pressure chamber and the low-pressure chamber is not large, the stop plate 1331 can block the air guide hole 135, thereby preventing the fresh air in the fresh air duct 210 from flowing to the return air duct 230. When the pressure difference between the high-pressure chamber and the low-pressure chamber reaches a preset value, under the action of pressure, the stop plate 1331 rotates relative to the mounting shell 131, thereby opening the air guide hole 135 and discharging excess fresh air to the return air duct 230.

[0044] In this embodiment, there is a small gap between the stop plate 1331 and the inner wall of the air guide hole 135 to prevent the inner wall from interfering with the rotation of the stop plate 1331. Under normal circumstances, the existence of the small gap has a negligible effect on the gas flow between the high-pressure chamber and the low-pressure chamber. Under normal circumstances, the high-pressure chamber and the low-pressure chamber can be isolated by the stop plate 1331.

[0045] In this embodiment, the stop plate 1331 is provided with a plurality of holding positions in the vertical direction, and the gravity block 1333 can be installed in one of the holding positions, so as to adjust the rotation force arm of the stop plate 1331, and then adjust the opening pressure of the stop plate 1331. For example, when the gravity block 1333 is located at the bottom of the stop plate 1331, the opening pressure of the stop plate 1331 is the largest, and when the gravity block 1333 is located in the middle of the stop plate 1331, the opening pressure of the stop plate 1331 decreases accordingly. By adjusting the setting position of the gravity block 1333, the opening pressure difference of the self-powered constant pressure mechanism 130 can be adjusted to adapt to different working conditions.

[0046] It should also be noted that in this embodiment, the rotation angle of the stop plate 1331 is different according to the pressure difference between the high-pressure chamber and the low-pressure chamber. The minimum opening pressure difference is 5 Pa, and the full-open pressure difference is 150 Pa. When the stop plate 1331 is fully opened, it is almost in a horizontal direction. At this time, the high-pressure chamber and the low-pressure chamber are fully conductive.

[0047] In this embodiment, a windshield 150 is further provided in the high pressure chamber, and the windshield 150 is provided between the mounting shell 131 and the air inlet, and the windshield 150 is provided perpendicular to the air inlet direction and opposite to the air inlet 111, and is used to block the airflow entering from the air inlet 111. By providing the windshield 150, the airflow at the air inlet 111 can be uniformed, the influence of the wind speed on the self-powered constant pressure mechanism 130 is reduced, and the airflow is prevented from directly acting on the stop plate 1331, so that the pressure difference adjustment is more accurate and has a wider range of applications.

[0048] In this embodiment, the orthographic projection size of the wind shield 150 in the wind inlet direction is larger than the size of the air inlet 111. Specifically, the wind shield 150 is arranged in the vertical direction and is fixedly connected to the mounting shell 131, and the connection method can be an additional mounting rod or a direct connection with the mounting shell 131. Since the wind shield 150 is arranged and the wind shield 150 can block the airflow at the air inlet 111, the wind speed is reduced, so that the noise and vibration in the entire high-pressure chamber are smaller.

[0049] In this embodiment, a pressure difference detection pipeline 170 is further provided on the static pressure box 110, and the pressure difference detection pipeline 170 is connected to the high-pressure chamber and the low-pressure chamber respectively, and a pressure gauge 171 is further provided on the pressure difference detection pipeline 170 to detect the pressure difference between the high-pressure chamber and the low-pressure chamber. Specifically, the pressure gauge 171 can detect the pressure difference between the high-pressure chamber and the low-pressure chamber, and the pressure difference detection pipeline 170 will not affect the airflow between the high-pressure chamber and the low-pressure chamber.

[0050] In summary, the fresh air constant pressure device 100 provided in this embodiment can keep the pressure difference on both sides of the constant pressure device (supply air and return air ducts 230, fan outlet and inlet) constant at a certain preset value by setting the preset value of the self-powered constant pressure mechanism 130 in the device. When the pressure in the high-pressure chamber exceeds the set value, the self-powered constant pressure mechanism 130 automatically adjusts its damping to bypass the excess air volume, thereby maintaining the pressure difference at the set value. Specifically, through the cooperation of the stop plate 1331 and the gravity block 1333, when the pressure difference does not exceed the preset value, the stop plate 1331 closes the air guide hole 135, so that the gas between the high-pressure chamber and the low-pressure chamber is almost not circulated. When the pressure in the high-pressure chamber increases due to excessive fresh air, the air pressure acts on the stop plate 1331, so that the stop plate 1331 overcomes the gravity pulling effect of the gravity block 1333 and rotates relative to the mounting shell 131, thereby opening the air guide hole 135, so that excess fresh air can flow into the low-pressure chamber, adjust the pressure on both sides, automatically adjust the pressure difference between the fresh air duct 210 and the return air duct 230, and automatically discharge the excess fresh air in the fresh air duct 210 to the return air duct 230, making the fresh air system 200 more energy-saving and environmentally friendly.

[0051] Second embodiment

[0052] See also Figure 3 This embodiment provides a fresh air constant pressure device 100, whose basic structure, principle and technical effects are the same as those of the first embodiment. For the sake of brief description, parts not mentioned in this embodiment may refer to the corresponding contents in the first embodiment.

[0053] In this embodiment, the fresh air constant pressure device 100 includes a static pressure box 110 and a self-powered constant pressure mechanism 130. An air inlet 111 and an air outlet 113 are respectively provided at both ends of the static pressure box 110. The air inlet 111 is used to connect to the fresh air duct 210, and the air outlet 113 is used to connect to the return air duct 230. The self-powered constant pressure mechanism 130 is arranged in the static pressure box 110 and divides the static pressure box 110 into a high-pressure chamber and a low-pressure chamber. The air inlet 111 is connected to the high-pressure chamber, and the air outlet 113 is connected to the low-pressure chamber. The self-powered constant pressure mechanism 130 is used to connect the high-pressure chamber and the low-pressure chamber when the pressure difference between the high-pressure chamber and the low-pressure chamber reaches a preset value.

[0054] The self-powered constant pressure mechanism 130 includes a mounting shell 131 and a conducting component 133. The mounting shell 131 is arranged in the middle of the static pressure box 110, and a wind guide hole 135 is opened on the mounting shell 131. The two ends of the wind guide hole 135 are respectively connected to the high-pressure chamber and the low-pressure chamber. The conducting component 133 is arranged in the wind guide hole 135, and is used to conduct the wind guide hole 135 according to the pressure difference between the high-pressure chamber and the low-pressure chamber.

[0055] The conducting assembly 133 includes a stop plate 1331 and an elastic member 1335. The stop plate 1331 is arranged in the air guide hole 135 and cooperates with the air guide hole 135, and one end of the stop plate 1331 is hinged to the mounting shell 131. The elastic member 1335 is arranged between the mounting shell 131 and the stop plate 1331, and is used to provide an elastic force to the stop plate 1331 to rotate toward the high-pressure chamber.

[0056] In this embodiment, the elastic member 1335 is a spring, one end of which is connected to the mounting shell 131, and the other end of which is against the surface of the stop plate 1331 near the low-pressure chamber. When the stop plate 1331 is pressed and rotated, the spring is in a compressed state, providing a reverse elastic force to the stop plate 1331. Under normal circumstances, under the support of the spring and the gravity of the stop plate 1331, the stop plate 1331 is in a vertical state, thereby shielding the air guide hole 135. When the pressure difference between the high-pressure chamber and the low-pressure chamber is too large, the stop plate 1331 rotates relative to the mounting shell 131 under the action of air pressure, and the spring is continuously compressed. As the pressure difference increases, the rotation angle of the stop plate 1331 increases, thereby achieving the adjustment of the opening.

[0057] Third embodiment

[0058] See also Figure 4 This embodiment provides a fresh air system 200, including a fresh air duct 210, a return air duct 230 and a fresh air constant pressure device 100. The basic structure and principle of the fresh air constant pressure device 100 and the technical effect produced are the same as those of the first embodiment. For the sake of brief description, for parts not mentioned in this embodiment, please refer to the corresponding content in the first embodiment.

[0059] The fresh air constant pressure device 100 includes a static pressure box 110 and a self-powered constant pressure mechanism 130. The two ends of the static pressure box 110 are respectively provided with an air inlet 111 and an air outlet 113. The self-powered constant pressure mechanism 130 is arranged in the static pressure box 110 and divides the static pressure box 110 into a high-pressure chamber and a low-pressure chamber. The air inlet 111 is connected to the high-pressure chamber, and the air outlet 113 is connected to the low-pressure chamber. The self-powered constant pressure mechanism 130 is used to conduct the high-pressure chamber and the low-pressure chamber according to the pressure difference between the high-pressure chamber and the low-pressure chamber. The air inlet 111 is connected to the fresh air duct 210, and the air outlet 113 is connected to the return air duct 230.

[0060] In this embodiment, the air inlet 111 is provided with an air inlet duct 115, and the air outlet 113 is provided with an exhaust duct 117. The air inlet duct 115 is connected to the fresh air duct 210, and the exhaust duct 117 is connected to the return air duct 230. By additionally setting up the exhaust duct 117 and connecting the air inlet duct 115, the fresh air constant pressure device 100 can be directly installed in a normal fresh air system 200 without adjusting the positions of the fresh air duct 210 and the return air duct 230, thereby improving the adaptability of the fresh air constant pressure device 100.

[0061] In this embodiment, the air outlet end of the fresh air duct 210 is connected to multiple rooms through a capillary tube to supply fresh air to the multiple rooms. The return air duct 230 is also connected to multiple rooms through a capillary tube to exhaust air to the multiple rooms. When the fresh air outlet of one or more rooms is closed, the fresh air in the fresh air duct 210 will remain and accumulate, causing the pressure to rise. In this case, the pressure difference between the fresh air duct 210 and the return air duct 230 is adjusted by the fresh air constant pressure device 100, so that the excess fresh air is discharged to the return air duct 230, thereby preventing the excess fresh air from continuing to enter the fresh air circulation system and causing energy waste.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fresh air constant pressure device, characterized in that: It comprises a static pressure box and a self-powered constant pressure mechanism, wherein an air inlet and an air outlet are respectively provided at both ends of the static pressure box, the air inlet is used to connect to a fresh air duct, the air outlet is used to connect to a return air duct, the self-powered constant pressure mechanism is arranged in the static pressure box and divides the static pressure box into a high-pressure chamber and a low-pressure chamber, the air inlet is connected to the high-pressure chamber, the air outlet is connected to the low-pressure chamber, and the self-powered constant pressure mechanism is used to connect the high-pressure chamber and the low-pressure chamber when the pressure difference between the high-pressure chamber and the low-pressure chamber reaches a preset value; The self-powered constant pressure mechanism comprises a mounting shell and a conduction component, wherein the mounting shell is arranged in the middle of the static pressure box, and an air guide hole is opened on the mounting shell, and the two ends of the air guide hole are respectively connected with the high-pressure chamber and the low-pressure chamber, and the conduction component is arranged in the air guide hole, and is used to conduct the air guide hole according to the pressure difference between the high-pressure chamber and the low-pressure chamber; The air inlet is provided with an air inlet duct, and the air outlet is provided with an air exhaust duct. The air inlet duct is connected to the fresh air duct, and the air exhaust duct is connected to the return air duct.

2. The fresh air constant pressure device according to claim 1, characterized in that: The conduction component includes a stop plate and a gravity block. The stop plate is arranged in the air guide hole and cooperates with the air guide hole, and the top end of the stop plate is hinged to the mounting shell. The gravity block is arranged at the bottom end of the stop plate. The stop plate is used to block the air guide hole under the action of the gravity block.

3. The fresh air constant pressure device according to claim 1, characterized in that: The conduction assembly includes a stop plate and an elastic member, wherein the stop plate is arranged in the air guide hole and cooperates with the air guide hole, and one end of the stop plate is hinged to the mounting shell, and the elastic member is arranged between the mounting shell and the stop plate, and is used to provide an elastic force to the stop plate to rotate toward the high-pressure chamber.

4. The fresh air constant pressure device according to claim 1, characterized in that: There are two conduction components, and the mounting shell is provided with two wind guide holes distributed perpendicular to the air inlet direction. The two conduction components are arranged in the two wind guide holes in a one-to-one correspondence.

5. The fresh air constant pressure device according to claim 1, characterized in that: A wind shield is also provided in the high-pressure chamber. The wind shield is provided between the mounting shell and the air inlet. The wind shield is provided perpendicular to the air inlet direction and opposite to the air inlet, so as to block the airflow entering from the air inlet.

6. The fresh air constant pressure device according to claim 5, characterized in that: The orthographic projection size of the wind shield in the wind inlet direction is larger than the size of the air inlet.

7. The fresh air constant pressure device according to claim 1, characterized in that: The static pressure box is also provided with a pressure difference detection pipeline, which is connected to the high-pressure chamber and the low-pressure chamber respectively, and a pressure gauge is also provided on the pressure difference detection pipeline for detecting the pressure difference between the high-pressure chamber and the low-pressure chamber.

8. A fresh air system, characterized in that: It comprises a fresh air duct, a return air duct and a fresh air constant pressure device as described in any one of claims 1 to 7, the air inlet is connected to the fresh air duct, and the air outlet is connected to the return air duct.

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