Ventilation valve and ventilation system

Abstract

The utility model discloses a ventilation valve and a ventilation system, the ventilation valve comprises: a housing comprising a cavity, the cavity penetrates through the housing along a first direction, and the cavity along the first direction comprises an air inlet and an air outlet which are oppositely arranged; the fixing part is arranged in the cavity, the fixing part and the first inner wall of the cavity are arranged in a spaced mode in the second direction, and the fixing part comprises a conical surface; the valve element is slidably arranged in the cavity in the first direction, the valve element comprises an outer side ring surface and an inner side ring surface, and the valve element can be switched between a first state and a second state; in the first state, the inner side ring surface and the conical surface are arranged at intervals, and a first air duct is formed between the inner side ring surface and the conical surface; in the second state, the outer side ring face and the first inner wall are arranged at intervals, a second air channel is formed between the outer side ring face and the first inner wall, and the inner side ring face and the conical face are arranged at intervals to form a first air channel. The flow regulating valve has high flow regulating precision.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation devices, in particular to a ventilation valve and a ventilation system. Background Art

[0002] The main function of the air volume control system is to adjust the indoor and outdoor air flow to maintain the indoor air quality and meet the air volume requirements of different occasions. This system usually contains components such as regulating valves, sensors, actuators, etc., which can be adjusted manually or automatically. It is widely used in the pharmaceutical, health, electronics, chemical, machinery and other industries. In some occasions, there are very high requirements for the adjustment accuracy of the air volume control system, such as clean workshops, hospital operating rooms, etc., which require the indoor ventilation volume to be accurately adjusted through the air volume control system.

[0003] In the prior art, the gas flow is controlled by a butterfly valve, but there are generally problems such as general sealing, slow control response and low gas flow regulation accuracy. In particular, when the gas flow rate is small, it is difficult to control the stable flow of gas through the butterfly valve. Since the flow characteristic curve of the butterfly valve is a fast-opening flow characteristic, the flow change is more obvious when the butterfly valve is at a small opening, but the flow change is relatively slow when the butterfly valve is at a large opening, that is, the ratio of the flow change to the flow rate is small, the sensitivity of the flow regulation is low, and the flow regulation ability is insufficient. Utility Model Content

[0004] The utility model aims to solve the technical problem of low gas flow control accuracy at different gas openings in the prior art. The utility model provides a ventilation valve that has high flow regulation accuracy at both large and small openings and can maintain good flow regulation capabilities.

[0005] In order to solve the above technical problems, the embodiment of the utility model discloses a ventilation valve, comprising:

[0006] A housing, comprising a cavity, the cavity penetrating the housing along a first direction, and the cavity comprising an air inlet and an air outlet arranged opposite to each other along the first direction;

[0007] A fixing portion, the fixing portion is disposed in the cavity, the fixing portion is spaced apart from the first inner wall of the cavity along the second direction, and the fixing portion includes a conical surface;

[0008] A valve core, the valve core is slidably disposed in the cavity along the first direction, the valve core comprises an outer annular surface and an inner annular surface, and the valve core can be switched between a first state and a second state;

[0009] In the first state, the inner annular surface and the conical surface are spaced apart to form a first air duct between the inner annular surface and the conical surface;

[0010] In the second state, the outer annular surface is spaced apart from the first inner wall to form a second air duct between the outer annular surface and the first inner wall, and the inner annular surface is spaced apart from the conical surface to form the first air duct.

[0011] By adopting the above technical scheme, when the ventilation valve is in a small opening to adjust the flow, that is, in the first state, the outer annular surface is in contact with the flow detection part, and the inner annular surface is spaced apart from the conical surface, so that a first air duct is formed between the inner annular surface and the conical surface. At this time, the gas only flows through the first air duct, and the inner annular surface of the valve core slides away from or close to the conical surface in the first direction, thereby changing the spacing distance between the inner annular surface and the conical surface, thereby adjusting the opening of the first air duct to adjust the flow. Since the first air duct is formed by the inner annular surface and the conical surface, when the valve core slides in the first direction, the opening area of ​​the first air duct changes gradiently and the change is small. For example, when the valve core moves 10mm toward the air outlet in the first direction, the opening area of ​​the first air duct only increases by 1dm², and the air volume passing through the first air duct is small. Therefore, the flow rate flowing through the first air duct changes slowly, the amplification coefficient is small, and the gas oscillation is small, and the flow rate regulation accuracy is high under small air volume.

[0012] When the air valve is in a large opening to adjust the flow, that is, in the second state, the outer annular surface and the flow detection part are spaced apart to form a second air duct between the outer annular surface and the flow detection part, and the inner annular surface and the conical surface are spaced apart to form a first air duct. Because the gas flow base is large in the state of large air volume, the gas flows through the first air duct and the second air duct at the same time. Therefore, the ventilation area in the second state is larger than the ventilation area in the first state, that is, the flow rate changes faster in the second state, which can meet the ventilation requirements under large air volume. By adjusting the inner annular surface of the valve core to slide away from or close to the conical surface in a first direction, the spacing distance between the inner annular surface and the conical surface is changed, and by adjusting the outer annular surface of the valve core to slide away from or close to the first inner wall in a first direction, the spacing distance between the outer annular surface and the first inner wall is changed to adjust the opening of the first air duct and the second air duct, thereby achieving precise adjustment of the flow under large air volume and still maintaining good adjustment ability at large flow.

[0013] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, the fixed part includes a fixed cone core, along the first direction, the fixed cone core includes a first part, the conical surface is arranged on the first part, and the first part is arranged in a truncated cone shape.

[0014] According to another specific embodiment of the utility model, an embodiment of the utility model discloses a ventilation valve, the fixed part includes a second part and a third part, along the first direction, one end of the second part is connected to the first part, the other end of the second part is connected to the third part, the second part is cylindrical, and the third part is truncated cone.

[0015] By adopting the above technical solution, in the first state, after the gas enters the cavity from the air inlet, it passes through the third part, the second part, and the first part in sequence to stably enter the first air duct, which can avoid the occurrence of turbulence, make the gas flow rate more stable when adjusting, and can accurately control the flow rate under small air volume.

[0016] According to another specific embodiment of the utility model, an embodiment of the utility model discloses a ventilation valve, which can switch between a closed state, the first state and the second state. In the closed state, the outer annular surface abuts against the first inner wall, the inner annular surface abuts against the fixed portion, and the first air duct and the second air duct are both closed.

[0017] By adopting the above technical scheme, by controlling the reciprocating movement of the valve core in the first direction, the ventilation valve can be easily switched between the closed state, the first state and the second state, that is, it can quickly respond to switch to different states under different ventilation volumes. For example, the ventilation valve switches to the first state under small air volume, and switches to the second state under large air volume. When there is no wind, the ventilation valve switches to the closed state, which has the advantage of high working efficiency.

[0018] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, the valve core is conically arranged, the inner annular surface forms a conical hole, and in the closed state, the inner surface of the conical hole is arranged in contact with the abutment surface.

[0019] By adopting the above technical solution, in the closed state, the inner ring surface of the tapered hole can be fitted on the conical surface to improve the sealing performance between the inner ring surface and the conical surface.

[0020] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, wherein the first inner wall comprises an annular horizontal wall and an annular diffusion wall, one end of the annular diffusion wall is connected to the annular horizontal wall, and the other end is connected to the second inner wall of the cavity, along the second direction, the annular horizontal wall and the second inner wall are spaced apart, along the first direction, the annular diffusion wall is arranged on the side of the annular horizontal wall facing away from the air inlet, the inner diameter of the annular diffusion wall is not less than the inner diameter of the annular horizontal wall, and the inner diameter of the annular diffusion wall increases along the first direction toward the air outlet;

[0021] In the first state, the outer annular surface abuts against the annular horizontal wall, and in the second state, the outer annular surface is spaced apart from the annular diffusion wall, so that the airflow passes through the annular horizontal wall and the annular diffusion wall in sequence.

[0022] With the above technical solution, the inner diameter of the annular diffusion wall is not less than the inner diameter of the annular horizontal wall, and the inner diameter of the annular diffusion wall increases along the first direction toward the air outlet. According to the Venturi principle, when the gas flows through the annular diffusion wall, it will form a local expansion, resulting in a decrease in flow velocity and a reduction in turbulence. When the valve stem slides along the first direction to the intersection of the annular horizontal wall and the annular diffusion wall, the outer annular surface and the annular diffusion wall form a second air duct with an adjustable opening, which is used for adjustment when the gas flow is large. When the valve stem is at the same sliding distance, the opening of the second air duct is larger than the opening of the first air duct. Therefore, when a large flow of gas is flowing, the gas flow can be accurately adjusted in the second state.

[0023] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, the first inner wall includes an annular air inlet wall, one end of the annular air inlet wall is connected to the annular horizontal wall, and the other end is connected to the second inner wall, along the first direction, the annular air inlet wall is arranged on the side of the annular horizontal wall close to the air inlet, the inner diameter of the annular air inlet wall is not smaller than the inner diameter of the annular horizontal wall, and the inner diameter of the annular air inlet wall increases along the first direction toward the air inlet.

[0024] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, wherein the inner diameter of the annular diffusion wall gradually increases along the first direction toward the air inlet, and the projection of the annular air inlet wall in the second direction is arc-shaped.

[0025] By adopting the above technical solution, the inner diameter of the annular air inlet wall is not smaller than the inner diameter of the annular horizontal wall, and the inner diameter of the annular air inlet wall gradually increases along the first direction toward the air inlet. According to the Venturi principle, the gas will be compressed when it flows from the annular air inlet wall into the annular horizontal wall, resulting in an increase in flow velocity and a decrease in pressure, thereby producing an adsorption effect on the gas around the air inlet to achieve stable air supply.

[0026] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, including a flow detection part. Along the first direction, the flow detection part is arranged on one side of the cavity close to the air inlet, and is used to detect the air volume flowing into the air inlet.

[0027] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses a ventilation valve, wherein the flow detection portion is composed of the annular air inlet wall, the second inner wall and the annular horizontal wall.

[0028] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, which includes a differential pressure sensor, a first pressure taking tube and a second pressure taking tube, the flow detection part includes a first pressure taking port and a second pressure taking port, the first pressure taking port is arranged on the annular air inlet wall, the second pressure taking port is arranged on the annular horizontal wall, the first pressure taking tube connects the differential pressure sensor and the first pressure taking port, and the second pressure taking tube connects the differential pressure sensor and the second pressure taking port.

[0029] By adopting the above technical scheme, the first pressure port is arranged on the annular air inlet wall, and the second pressure port is arranged on the annular horizontal wall. Since the gas will be compressed when it flows from the annular air inlet wall into the annular horizontal wall, the gas has different pressure values ​​in the annular air inlet wall and the annular horizontal wall. The differential pressure sensor detects the pressure value of the first pressure port and the pressure value of the second pressure port respectively through the first pressure tube and the second pressure tube. According to the pressure difference between the pressure value of the first pressure port and the pressure value of the second pressure port, the Bernoulli equation is substituted to calculate the gas flow value flowing through the ventilation valve in real time. In this way, the gas circulation in the ventilation valve can be adjusted according to the flow value that can be measured in real time, thereby improving the adjustment accuracy.

[0030] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, wherein the annular horizontal wall, the annular air inlet wall, the annular diffusion wall and the second inner wall of the cavity together enclose a pressure taking cavity;

[0031] The flow detection part includes a first baffle. Along the second direction, one end of the first baffle is connected to the second inner wall, and the other end is connected to the annular horizontal wall. Along the first direction, the first baffle forms a first pressure taking chamber and a second pressure taking chamber in the pressure taking chamber. The first pressure taking port is arranged in the first pressure taking chamber, and the second pressure taking port is arranged in the second pressure taking chamber.

[0032] By adopting the above technical scheme, the first pressure taking port is arranged in the first pressure taking chamber, and the second pressure taking port is arranged in the second pressure taking chamber. The first pressure taking tube only needs to be connected to the first pressure taking chamber, and the second pressure taking tube only needs to be connected to the second pressure taking chamber. The first pressure taking port and the second pressure taking port will not interfere with each other, and the differential pressure sensor can stably detect the pressure value of the first pressure taking port and the pressure value of the second pressure taking port respectively through the first pressure taking tube and the second pressure taking tube.

[0033] According to another specific embodiment of the utility model, an embodiment of the utility model discloses a ventilation valve, the flow detection part includes a second baffle, the first baffle, the second inner wall of the cavity and the annular air inlet wall together form the first pressure taking chamber, the second baffle, the first baffle, the second inner wall of the cavity and the annular horizontal wall together form the second pressure taking chamber.

[0034] By adopting the above technical scheme, before the second baffle is set, the second pressure taking chamber is formed by the first baffle, the annular horizontal wall, the second inner wall, and the annular diffusion wall. After the second baffle is added in this embodiment, the second pressure taking chamber is formed by the first baffle, the annular horizontal wall, the second inner wall, and the second baffle portion. By comparison, it can be seen that after the baffle is added, the volume of the second pressure taking chamber is smaller, and the pressure measurement efficiency and accuracy are higher.

[0035] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, including a valve stem and a driving part, the valve stem is slidably arranged in the cavity along the first direction, the valve core is arranged on the valve stem, the valve stem is passed through the fixed part, and the fixed part does not move synchronously with the valve stem, and the driving part is connected to the valve stem, and is used to enable the valve stem to drive the valve core to switch between a first state and a second state.

[0036] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, which includes a fixed frame, the fixed frame is arranged in the cavity, the fixing part is arranged on the fixed frame, and the valve stem is slidably arranged on the fixed frame along the first direction.

[0037] By adopting the above technical solution, a fixing frame is provided in the cavity, the fixing part is provided on the fixing frame, and the valve stem is slidably provided on the fixing frame along the first direction, which has a simple structure and lower cost.

[0038] According to another specific embodiment of the utility model, an embodiment of the utility model discloses a ventilation valve, the driving part includes an actuator and a transmission connecting rod, the actuator is arranged on the outer side of the shell facing away from the cavity, one end of the transmission connecting rod passes through the shell and is connected to the valve stem, and the other end is connected to the actuator, which is used to convert the rotational motion of the actuator into a linear reciprocating motion of the valve stem in the first direction.

[0039] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a ventilation valve, wherein the surface of the outer annular surface is covered with a sealing soft glue, and the surface of the inner annular surface is covered with a sealing soft glue.

[0040] By adopting the above technical solution, the sealing performance between the outer annular surface and the first inner wall, and the sealing performance between the inner annular surface and the fixing portion can be further improved.

[0041] The embodiment of the utility model further discloses a ventilation system, which at least includes the ventilation valve in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The flow characteristic curve under ideal conditions is shown.

[0043] Figure 2 An exploded view of a ventilation valve provided in an embodiment of the present application is shown.

[0044] Figure 3 A three-dimensional cross-sectional schematic diagram of the ventilation valve provided in an embodiment of the present application in a closed state is shown.

[0045] Figure 4 A cross-sectional schematic diagram of the ventilation valve provided in an embodiment of the present application in a closed state is shown.

[0046] Figure 4a An enlarged schematic diagram of a first sealing portion and a second sealing portion of a ventilation valve provided in an embodiment of the present application is shown.

[0047] Figure 4b An enlarged schematic diagram of the first pressure port and the second pressure port of the ventilation valve provided in an embodiment of the present application is shown.

[0048] Figure 5 A cross-sectional schematic diagram of a ventilation valve provided in an embodiment of the present application including a Pitot tube flowmeter is shown.

[0049] Figure 5a A cross-sectional schematic diagram of a ventilation valve provided in an embodiment of the present application including an impeller flowmeter is shown.

[0050] Figure 5b A three-dimensional schematic diagram of a valve core of a ventilation valve provided in an embodiment of the present application is shown.

[0051] Figure 6 A schematic cross-sectional view of the fixing portion of the ventilation valve provided in an embodiment of the present application is shown.

[0052] Figure 7 A schematic three-dimensional cross-sectional view of the ventilation valve provided in an embodiment of the present application in a first state is shown.

[0053] Figure 8 A schematic cross-sectional view of the ventilation valve provided in an embodiment of the present application in a first state is shown.

[0054] Fig. 9A schematic three-dimensional cross-sectional view of the ventilation valve provided in an embodiment of the present application in a second state is shown.

[0055] Fig.10 A schematic cross-sectional view of the ventilation valve provided in an embodiment of the present application in a second state is shown.

[0056] Fig.11 A cross-sectional schematic diagram is shown in which the driving part of the valve core of the ventilation valve provided in an embodiment of the present application is built into a cavity. DETAILED DESCRIPTION

[0057] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0058] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0059] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0060] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0061] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0062] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0063] In the prior art, it is necessary to set an air valve in the air volume regulation system to control the flow of gas in the system. In the prior art, a butterfly valve is usually used to control the flow of gas, but there are generally problems such as general sealing, slow control response and low gas flow regulation accuracy.

[0064] The applicant has found that the main reason for the low adjustment accuracy in the existing air volume adjustment system is that the butterfly valve itself has a simple structural design and limited adjustment accuracy. Figure 1 , Figure 1 Four ideal flow characteristic curves are shown, among which the butterfly valve has a quick-opening flow characteristic. When the stroke of the butterfly valve is small, the flow changes significantly and the flow quickly reaches the maximum, that is, the flow increases rapidly at a small opening; while at a large opening, the flow changes relatively slowly, that is, the ratio of the flow change to the flow is small.

[0065] Further, refer to Table 1 and combine Figure 1 , Figure 1 Four typical ideal flow characteristic curves are shown, including the fast-opening flow characteristic curve L1, the linear flow characteristic curve L2, the parabolic flow characteristic curve L3 and the logarithmic flow characteristic curve L4. The flow characteristic of a regulating valve refers to the relationship between the relative flow rate of the medium flowing through the regulating valve and the relative opening of the regulating valve. Figure 1 The horizontal axis represents the relative opening change of the valve (l represents the actual opening value of the valve, L represents the total opening value of the valve), and the vertical axis represents the relative flow change of the valve (q represents the actual flow value corresponding to the actual opening value of the valve, and Q represents the total flow value of the valve).

[0066] Among them, the linear flow characteristic means that the relative flow and relative opening of the regulating valve are in a linear relationship, that is, the relative flow change caused by a unit relative opening change is a constant. The relative flow value changes greatly when the opening is small, and the relative flow value changes little when the opening is large. The adjustment is too sensitive and easy to oscillate when the load is small, and the adjustment is smooth and untimely when the load is large, and the adaptability is poor.

[0067] The quick-opening flow characteristic means that when the regulating valve is adjusted at a small opening, the air volume changes significantly, and the flow cannot be accurately adjusted at a small air volume. The relative flow value changes greatly at a small opening, and the flow changes relatively slowly as the opening increases. The logarithmic flow characteristic means that the percentage of flow change caused by a unit relative opening change is equal, and it works relatively smoothly within the entire opening change range, especially at a large opening. The amplification factor is large, the adjustment sensitivity is high, and it is widely used. The parabolic flow characteristic means that the relative flow of the regulating valve is proportional to the square root of the relative opening. The parabolic flow characteristic is between the linear flow characteristic and the logarithmic flow characteristic.

[0068] Table 1 shows the flow rate changes of the butterfly valve at different openings. When the butterfly valve is opened at 30%, the air volume has reached 52.63% of the total air volume. Therefore, it is difficult to accurately control the opening of the butterfly valve to keep the gas flowing at a small flow rate. When the butterfly valve is opened at 70%-100%, the flow rate changes by only about 10% in total. Therefore, there will be problems such as low adjustment sensitivity and insufficient adjustment ability at a large opening. The flow characteristics of the butterfly valve belong to Figure 1 The quick opening flow characteristic curve L1.

[0069] Table 1 also shows the flow rate change of the Venturi valve at different openings. When the opening of the Venturi valve is 30%, the air volume reaches 9.25% of the total air volume. At a large opening, such as 70%-100%, the flow rate change can still maintain 40.5%. Compared with the butterfly valve, the Venturi valve has better precision control, but it still cannot reach the ideal logarithmic flow characteristic curve L4.

[0070] Table 1 Flow rate changes of butterfly valve and venturi valve at different openings

[0071]

[0072] Based on this, reference Figure 2 , Figure 3 , Figure 4 An embodiment of the present application provides a ventilation valve 1, including a housing 10, a driving portion 20, a flow detection portion 30, a fixing portion 40, a valve core 50 and a valve stem 60, wherein the housing 10 includes a cavity 11. Figure 2 An exploded view of the ventilation valve 1 is shown, combined with Figure 4 As shown, the housing 10, the driving unit 20, the flow detection unit 30, the fixing unit 40, the valve core 50 and the valve stem 60 are assembled and connected along the dotted line f. Figure 3The ventilation valve 1 includes a fixing frame 80, the fixing frame 80 is arranged in the cavity 11, the fixing portion 40 is arranged on the fixing frame 80, and the valve stem 60 is slidably arranged on the fixing frame 80 along the first direction X. When the components of the ventilation valve 1 are in an assembled state, for example Figure 3 , Figure 4 As shown, the fixing frame 80 , the fixing portion 40 and the valve core 50 are all sleeved on the valve stem 60 .

[0073] Exemplarily, the housing 10 is in a hollow cylindrical shape, the first direction X mentioned below is an axial direction, and the second direction Y and the third direction Z are radial directions. It can be understood that the present application does not limit the shape of the housing 10, for example, it can also be a hollow cuboid or the like.

[0074] In some embodiments, see Figure 2 , Figure 3 , Figure 4 The cavity 11 penetrates the housing 10 along the first direction X. Along the first direction X, the cavity 11 includes an air inlet 111 and an air outlet 112 that are arranged opposite to each other. The cavity 11 includes a first inner wall 113 and a second inner wall 114. Along the second direction Y, the first inner wall 113 is convexly arranged on the second inner wall 114 of the cavity 11. The fixing portion 40 is arranged in the cavity 11. Along the second direction Y, the fixing portion 40 is spaced apart from the first inner wall 113. Exemplarily, along the second direction Y, the fixing portion 40 includes a conical surface 411, and the conical surface 411 is spaced apart from the annular horizontal wall 31 of the first inner wall 113.

[0075] In some embodiments, see Figure 2 , Figure 3 , Figure 4 The valve core 50 is arranged in the cavity 11, and the valve core 50 includes an outer annular surface 51 and an inner annular surface 52. The valve stem 60 is slidably arranged in the cavity 11 along the first direction X. The valve core 50 is arranged on the valve stem 60, and the valve stem 60 is penetrated by the fixing part 40, and the fixing part 40 does not move synchronously with the valve stem 60. The driving part 20 is connected to the valve stem 60, and is used to switch the valve core 50 between the first state and the second state.

[0076] In the first state, the outer annular surface 51 abuts against the first inner wall 113, the inner annular surface 52 is spaced apart from the conical surface 411, and a first air duct 70 (such as Figure 7 , Figure 8 As shown), and the fluid flows along the path e in the first air duct 70; in the second state, the outer annular surface 51 and the first inner wall 113 are spaced apart, and a second air duct 71 is formed between the outer annular surface 51 and the first inner wall 113 (as shown Fig. 9 , Fig.10As shown), and the fluid flows along the path d in the second air duct 71, the inner annular surface 52 and the conical surface 411 are spaced apart to form the first air duct 70; the ventilation area in the second state is greater than the ventilation area in the first state, and the ventilation volume in the second state is greater than the ventilation volume in the first state.

[0077] It should be noted that the conical surface 411 referred to in the present application should be understood as the side surface of the cone, that is, the projection of the conical surface 411 in the second direction can be a straight line or an arc. Regardless of whether the conical surface 411 is a plane or a curved surface with an arc, it falls within the protection scope of the present application.

[0078] For example, see Figure 3 , Figure 7 , Fig. 9 The ventilation valve can switch between a closed state, a first state, and a second state. In the closed state, the outer annular surface 51 abuts against the first inner wall 113, the inner annular surface 52 abuts against the conical surface 411, and the first air duct 70 and the second air duct 71 are both closed. It can be understood that the ventilation valve 1 provided in the present application can switch from the closed state to the first state or the second state, or from the first state to the closed state or the second state, or from the second state to the first state or the closed state.

[0079] See also Figure 2 , Figure 3 , Figure 4 , using the above technical solution, when the ventilation valve 1 is in a small opening to adjust the flow, that is, in the first state, the outer annular surface 51 abuts against the first inner wall 113, the inner annular surface 52 is spaced apart from the conical surface 411, and a first air duct 70 is formed between the inner annular surface 52 and the conical surface 411 (such as Figure 7 , Figure 8 As shown in the figure, at this time, the gas only flows through the first air duct 70, and the valve stem 60 is driven to slide in the first direction X by the driving unit 20, thereby driving the valve core 50 to slide in the first direction X, that is, the inner annular surface 52 of the valve core 50 can be adjusted to slide away from or close to the conical surface 411 along the first direction X, thereby changing the spacing distance between the inner annular surface 52 and the conical surface 411, thereby adjusting the opening of the first air duct 70 to adjust the flow rate. Since the first air duct 70 is formed by the inner annular surface 52 and the conical surface 411, the conical surface 411 and the first air duct 70 are connected. The distance of an inner wall 113 increases along the first direction X toward the air outlet 112. Therefore, when the valve core 50 slides in the first direction X, the opening area of ​​the first air duct 70 changes gradually and the change is small. For example, when the valve core 50 moves 10 mm toward the air outlet 112 in the first direction X, the opening area of ​​the first air duct 70 only increases by 1 dm², and the air volume passing through the first air duct 70 is small. Therefore, the flow rate flowing through the first air duct 70 changes slowly, the amplification coefficient is small, and the gas oscillation is small. The flow rate regulation accuracy is high under small air volume.

[0080] When the ventilation valve 1 is in a large opening to adjust the flow, that is, in the second state, the outer annular surface 51 is spaced apart from the first inner wall 113, and a second air duct 71 is formed between the outer annular surface 51 and the first inner wall 113 (such as Fig. 9 , Fig.10 As shown in the figure, the inner annular surface 52 and the conical surface 411 are spaced apart to form a first air duct 70. At this time, the gas flows through the first air duct 70 and the second air duct 71 at the same time. Since the gas flow rate base is large in the state of large air volume, the gas flows through the first air duct 70 and the second air duct 71 at the same time. Therefore, the ventilation area in the second state is greater than the ventilation area in the first state, that is, the flow rate in the second state changes faster, which can meet the ventilation requirements under large air volume. The valve stem 60 is driven by the driving unit 20 to slide in the first direction X, thereby driving the valve core 5 0 slides in the first direction X, that is, the inner annular surface 52 of the regulating valve core 50 can slide away from or close to the conical surface 411 along the first direction X to change the spacing distance between the inner annular surface 52 and the conical surface 411, and the outer annular surface 51 of the regulating valve core 50 can slide away from or close to the first inner wall 113 along the first direction X to change the spacing distance between the outer annular surface 51 and the first inner wall 113, so as to adjust the opening of the first air duct 70 and the second air duct 71, thereby realizing accurate flow regulation, and still being able to maintain good regulation capability at a large flow.

[0081] In some embodiments, see Figure 2 , Figure 3 The fixing frame 80 includes a first bracket 81 and a second bracket 82, the first bracket 81 and the second bracket 82 are arranged opposite to each other along the first direction X, and the first inner wall 113, the fixing portion 40, the valve core 50 and the valve stem 60 are arranged between the first bracket 81 and the second bracket 82 along the first direction X. The first bracket 81 is arranged on a side of the cavity 11 close to the air inlet 111, and the second bracket 82 is arranged on a side of the cavity 11 close to the air outlet 112.

[0082] For example, see Figure 2 , Figure 3 , Figure 4The first bracket 81 includes a first connecting column 811 and a plurality of first connecting rods 812. The first connecting column 811 has a first connecting hole 8111. The valve stem 60 is inserted into the first connecting hole 8111. A plurality of first connecting rods 812 are arranged on the first connecting column 811 at intervals around the circumferential direction R. One end of each first connecting rod 812 is connected to the inner wall 113 of the cavity 11, and the other end is connected to the first connecting column 811. The second bracket 82 includes a second connecting column 821 and a plurality of second connecting rods 822. The second connecting column 821 has a second connecting hole 8211. The valve stem 60 is inserted into the second connecting hole 8211. A plurality of second connecting rods 822 are arranged on the second connecting column 821 at intervals around the circumferential direction R. One end of each second connecting rod 822 is connected to the inner wall 113 of the cavity 11, and the other end is connected to the second connecting column 821.

[0083] It can be understood that the present application does not limit the number of the first connecting rods 812 and the second connecting rods 822, for example, the number can be 1, 2, 3, 4, 5, 6, 7, etc.

[0084] In some embodiments, see Figure 2 , Figure 3 , Figure 4 Combined with Figure 5b The valve core 50 is conical, and the inner annular surface 52 forms a conical hole 521. In the closed state, the inner surface 5211 of the conical hole 521 is arranged in abutment with the conical surface 411. Exemplarily, the fixed part 40 includes a fixed cone core 41, and along the first direction X, the conical surface 411 is arranged on a side of the fixed cone core 41 close to the inner annular surface 5211. In the closed state, the inner surface 5211 of the conical hole 521 is arranged in abutment with the conical surface 411 of the fixed part 40.

[0085] For example, see Figure 4 , Figure 4a , Figure 5 Combined with Figure 3 The inner surface 5211 of the tapered hole 521 intersects with the projection of the valve stem 60 in the third direction Z to form a first angle a, and the tapered surface 411 intersects with the projection of the valve stem 60 in the third direction Z to form a second angle b. The flow characteristic curve of the ventilation valve 1 can be corrected by adjusting the angles of the first angle a and the second angle b, so that the ventilation valve 1 provided in the present application can have a logarithmic flow characteristic (corresponding to Figure 1 Logarithmic flow characteristic curve L4). For example, the first angle a and the second angle b are both 30°. It can be understood that the present application does not limit the size of the first angle a and the second angle b, for example, they can also be 20°, 25°, 30.5°, 40°, 60°, etc.

[0086] In some embodiments, the surface of the outer annular surface 51 is covered with a sealing soft glue, and the surface of the inner annular surface 52 is covered with a sealing soft glue. Figure 4 , Figure 4a The valve core 50 includes a first sealing portion 503 and a second sealing portion 504. The first sealing portion 503 is arranged at one end of the outer annular surface 51 close to the first inner wall 113, and the second sealing portion 504 is arranged at one end of the inner annular surface 52 close to the fixed portion 40. The first sealing portion 503 and the second sealing portion 504 are both formed of a sealing soft rubber. Exemplarily, the first sealing portion 503 and the second sealing portion 504 are both trapezoidal in shape. It can be understood that the present application does not limit the shapes of the first sealing portion 503 and the second sealing portion 504, for example, they can also be triangular in shape.

[0087] For example, see Figure 4 , Figure 5b Combined with Figure 2 The valve core 50 includes a first surface 501 and a second surface 502. The first surface 501 and the second surface 502 are respectively arranged on both sides of the valve core 50 along the first direction X. An outer annular surface 51 is arranged at one end of the valve core 50 close to the first inner wall 113 along the first direction X. The outer annular surface 51 extends along the circumferential direction R. The outer annular surface 51 is respectively connected to the first surface 501 and the second surface 502 in the first direction X. Along the first direction X, the tapered hole 521 is extended from the first surface 501 toward the second surface 502.

[0088] In some embodiments, see Figure 4 , Figure 5b Combined with Figure 2 The valve core 50 includes a recess 53, which is arranged on the first surface 501. Along the first direction X, the tapered hole 521 and the recess 53 are respectively opened on both sides of the valve core 50, wherein the recess 53 is concavely arranged from the first surface 501 toward the second surface 502 along the first direction X, and the tapered hole 521 passes through the second surface 502 and the recess 53 along the first direction X.

[0089] Exemplarily, the valve core 50 further includes a third connecting column 54 and a plurality of connecting plates 55, the third connecting column 54 includes a third connecting hole 541, the valve stem 60 is disposed in the third connecting hole 541, and a plurality of connecting plates 55 are disposed at intervals on the side 531 of the recess 53, one end of each connecting plate 55 is connected to the third connecting column 54, and the other end is connected to the side 531 of the recess 53. When the valve stem 60 reciprocates along the first direction X, it can drive the valve core 50 to move synchronously. It can be understood that the present application does not limit the number of connecting plates 55, for example, it can be 1, 2, 3, 4, 5, 6, 7, etc.

[0090] In some embodiments, see Figure 4 , Figure 6 Combined with Figure 2 , along the second direction Y, the conical surface 411 is arranged opposite to the first inner wall 113, and in the closed state, the inner annular surface 52 is arranged in abutment with the conical surface 411. Exemplarily, the fixed cone core 41 includes a first part 412, a second part 413 and a third part 414 connected in sequence along the first direction X, and the conical surface 411 is arranged on the first part 412, wherein the first part 412 and the third part 414 are arranged in a truncated cone shape, that is, the projections of the first part 412 and the third part 414 in the second direction Y are trapezoidal, and the second part 413 is arranged in a cylindrical shape. A fourth connecting column 415 is convexly arranged on the top surface 4141 of the third part 414, and the fourth connecting column 415 is arranged in the first connecting hole 8111, and the fourth connecting column 415 includes a fourth connecting hole 4151, and the valve stem 60 is passed through the fourth connecting hole 4151.

[0091] It is understandable that the present application does not limit the shapes of the first part 412, the second part 413 and the third part 414. For example, the first part 412 and the third part 414 can be prism-shaped or the like, and the second part 413 can be prism-shaped or the like.

[0092] In some embodiments, see Figure 2 , Figure 3 , Figure 4 The first inner wall 113 includes an annular horizontal wall 31 and an annular diffusion wall 32. The conical surface 411 is arranged opposite to the annular horizontal wall 31. One end of the annular diffusion wall 32 is connected to the annular horizontal wall 31, and the other end is connected to the second inner wall 114. Along the first direction X, the annular diffusion wall 32 is arranged on the side of the annular horizontal wall 31 facing away from the air inlet 111. The projections of the annular diffusion wall 32 and the annular horizontal wall 31 in the first direction X intersect to form a third angle c.

[0093] In the first state, the outer annular surface 51 abuts against the annular horizontal wall 31, and in the second state, the outer annular surface 51 is spaced apart from the annular diffusion wall 32, so that the airflow sequentially passes through the annular horizontal wall 31 and the annular diffusion wall 32. Exemplarily, the third angle c is 120°, and it can be understood that the present application does not limit the size of the third angle c, and it can also be 100°, 110°, 120.6°, 130°, etc.

[0094] For example, see Figure 3 , Figure 4 , Figure 4a Combined with Figure 2, the inner diameter d1 of the annular diffusion wall 32 is not less than the inner diameter d2 of the annular horizontal wall 31, the inner diameter d2 of the annular diffusion wall 32 increases along the first direction X toward the air outlet 112, at the intersection 320 of the annular diffusion wall 32 and the annular horizontal wall 31, the inner diameter d1 of the annular diffusion wall 32 is equal to the inner diameter d2 of the annular horizontal wall 31, and along the first direction X, the inner diameter d1 of the other parts of the annular diffusion wall 32 excluding the intersection 320 is greater than the inner diameter d2 of the annular horizontal wall 31. Therefore, in the second state, when the valve stem 60 drives the valve core 50 to slide along the first direction X away from the air inlet 111 to the intersection 320 of the annular horizontal wall 31 and the annular diffusion wall 32, a second air duct 71 with an adjustable opening size can be formed. Since the inner diameter d1 of the annular diffusion wall 32 is greater than the inner diameter d2 of the annular horizontal wall 31, the opening of the second air duct 71 formed between the annular diffusion wall 32 and the valve core 50 is larger, the flow rate change is also larger, and the flow of large flow of gas can be accurately adjusted.

[0095] In some embodiments, see Figure 3 , Figure 4 , Figure 4b The first inner wall 113 includes an annular air inlet wall 33, one end of the annular air inlet wall 33 is connected to the annular horizontal wall 31, and the other end is connected to the second inner wall 114. Along the first direction X, the annular air inlet wall 33 is arranged on a side of the annular horizontal wall 31 close to the air inlet 111. The inner diameter d3 of the annular air inlet wall 33 is not less than the inner diameter d2 of the annular horizontal wall 31. The inner diameter d3 of the annular air inlet wall 33 increases toward the air inlet 111 along the first direction X. At the intersection 330 of the annular air inlet wall 33 and the annular horizontal wall 31, the inner diameter d3 of the annular air inlet wall 33 is equal to the inner diameter d2 of the annular horizontal wall 31. Along the first direction X, the inner diameter d3 of other parts of the annular air inlet wall 33 excluding the intersection 330 is greater than the inner diameter d2 of the annular horizontal wall 31.

[0096] Exemplarily, the inner diameter d2 of the annular diffuser wall 32 may also be set to gradually increase along the first direction X toward the air outlet 112, and the projection in the second direction Y is a straight line, and the projection of the annular air inlet wall 33 in the second direction Y is an arc. It can be understood that in some embodiments, the inner diameter d3 of the annular air inlet wall 33 may also gradually increase along the first direction X toward the air inlet 111, and the projection in the second direction Y is a straight line, and the present application does not limit this. Exemplarily, the annular horizontal wall 31 has the same shape as the shell 10, both of which are hollow cylindrical, and the annular diffuser wall 32 and the annular air inlet wall 33 are both trumpet-shaped. It can be understood that the present application does not limit the shapes of the annular horizontal wall 10, the annular diffuser wall 32 and the annular air inlet wall 33. For example, the annular horizontal wall 31 may also be a hollow rectangular parallelepiped or the like.

[0097] In some embodiments, see Figure 2 , Figure 3 , Figure 4 Combined with Figure 4b , along the first direction X, the flow detection unit 30 is arranged on one side of the cavity 11 near the air inlet 111. Exemplarily, the ventilation valve 1 includes a differential pressure sensor (not shown in the figure), a first pressure-taking pipe 101 and a second pressure-taking pipe 102, and the flow detection unit 30 includes a first pressure-taking port 311 and a second pressure-taking port 331. The first pressure-taking port 311 is arranged on the annular air inlet wall 33, and the second pressure-taking port 331 is arranged on the annular horizontal wall 31. The first pressure-taking pipe 101 is connected to the differential pressure sensor and the first pressure-taking port 311, and the second pressure-taking pipe 102 is connected to the differential pressure sensor and the second pressure-taking port 331. The differential pressure sensor is used to detect the first pressure value of the gas flowing through the first pressure-taking port 311 and the second pressure value of the gas flowing through the second pressure-taking port 331, and output the difference between the first pressure value and the second pressure value.

[0098] Exemplarily, the flow detection unit 30 includes a plurality of first pressure ports 311 and a plurality of second pressure ports 331 , wherein the plurality of second pressure ports 331 are arranged at intervals along the circumferential direction R on the annular horizontal wall 31 , and the plurality of first pressure ports 311 are arranged at intervals along the circumferential direction R on the annular air inlet wall 33 .

[0099] It can be understood that the present application does not limit the number of the first pressure port 311 and the second pressure port 331 , for example, the number can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0100] When the gas flows into the air inlet 111, since the inner diameter d2 of the annular horizontal wall 31 is smaller than the inner diameter d3 of the annular air inlet wall 33, according to the Venturi principle, the gas will form local contraction when flowing through the annular horizontal wall 31, resulting in an increase in flow rate, thereby making the gas pressure value of the annular horizontal wall 31 (i.e., the second pressure value) smaller than the gas pressure value of the annular air inlet wall 33 (i.e., the first pressure value).

[0101] In this embodiment, the pressure difference between the first pressure value and the second pressure value can be obtained by detecting the first pressure value and the second pressure value through the pressure difference sensor, so that the gas flow value flowing through the ventilation valve 1 can be calculated according to the pressure difference and the Bernoulli equation. Since the pressure difference between the first pressure value and the second pressure value will change in real time with the actual situation of the gas flow, this embodiment can effectively improve the detection accuracy of the gas flow value.

[0102] In some embodiments, see Figure 2 , Figure 3 , Figure 4 Combined with Figure 4b, along the second direction Y, the annular horizontal wall 31 is spaced apart from the second inner wall 114, and the annular horizontal wall 31, the annular air inlet wall 33, the annular diffusion wall 32 and the second inner wall 114 together enclose a pressure taking cavity 36; the flow detection part 30 includes a first baffle plate 34, along the second direction Y, one end of the first baffle plate 34 is connected to the second inner wall 114, and the other end is connected to the annular horizontal wall 31, along the first direction X, the first baffle plate 34 forms a first pressure taking cavity 360 and a second pressure taking cavity 361 in the pressure taking cavity 36, the first pressure taking port 311 is provided in the first pressure taking cavity 360, and the second pressure taking port 331 is provided in the second pressure taking cavity 361.

[0103] For example, see Figure 4 , Figure 4b The flow detection unit 30 further includes a second baffle 35, the first baffle 34 and the second baffle 35 are arranged at intervals along the first direction X, the first baffle 34, the second inner wall 114 of the cavity 11 and the annular air inlet wall 33 together enclose a first pressure-taking cavity 360, and the first baffle 34, the second baffle 35, the second inner wall 114 of the cavity 11 and the annular horizontal wall 31 together enclose a second pressure-taking cavity 361. The first pressure-taking tube 101 connects the first pressure-taking cavity 360 and the differential pressure sensor, and the second pressure-taking tube 102 connects the second pressure-taking cavity 361 and the differential pressure sensor. In some embodiments, the first pressure-taking port 311 is provided at the connection between the annular air inlet wall 33 and the second inner wall 114, for connecting the first pressure-taking cavity 360 and the air inlet 11, and the second pressure-taking port 331 is provided at the portion of the annular horizontal wall 31 between the first baffle 34 and the second baffle 35, for connecting the second pressure-taking cavity 361 and the cavity 11.

[0104] In the aforementioned embodiments, the first baffle 34, the second baffle 35, the first pressure chamber 360, the second pressure chamber 361, the first pressure port 311 and the second pressure port 331 together form the flow detection unit 30 of the present application. At this time, the flow detection unit 30 of the ventilation valve 1 is a Venturi flowmeter. It can be understood that the present application does not limit the type of the flow detection unit 30 of the ventilation valve 1. For example, in some embodiments, refer to Figure 5 The type of the flow detection unit 30 is a Pitot tube flowmeter 90 .

[0105] Exemplarily, the Pitot tube flowmeter 90 includes a first tube body 901, a second tube body 902 and a detection mechanism (not shown in the figure), the first tube body 901 and the second tube body 902 are arranged in the cavity 11 near the air inlet 111, and exemplarily, along the first direction X, the first tube body 901 and the second tube body 902 are arranged between the first connecting rod 812 and the air inlet 111. The first tube body 901 extends along the second direction Y, and a first air hole (not shown in the figure) is provided on the tube wall of the first tube body 901, and the first air hole faces the air inlet 111; the second tube body 902 extends perpendicularly to the first tube body 901, and a second air hole (not shown in the figure) is provided on the tube wall of the second tube body 902, and the second air hole faces the air outlet 112. The detection mechanism is arranged on the outer side of the housing 10 facing away from the cavity 11, and is used to detect the first pressure value of the gas flowing through the first tube body 901 and the second pressure value of the gas flowing through the second tube body 902, and output the difference between the first pressure value and the second pressure value. According to the Pitot tube principle, the total pressure of the airflow (i.e., the first pressure value) is collected through the first air hole, and the static pressure of the airflow (i.e., the second pressure value) is collected through the second air hole. The pressure difference between the total pressure of the airflow and the static pressure can be obtained, so that the gas flow value flowing through the cavity 11 can be calculated based on the pressure difference and the Bernoulli equation.

[0106] In some embodiments, see Figure 5a , the type of the flow detection unit 30 is an impeller flowmeter 91. Exemplarily, the impeller flowmeter includes an impeller 911 and a controller 912. The impeller 911 is arranged on the side of the first connecting rod 812 facing the air inlet 111, along the second direction Y, and the controller 912 is arranged on the outer side of the housing 10 facing away from the cavity 11. The controller 912 is connected to the impeller 911. When the airflow passes through the impeller 911, the impeller 911 is driven to rotate. The controller 912 is used to receive the change of the electrical signal of the impeller 911 during the rotation process, and the rotation speed of the impeller 911 can be obtained by counting the electrical signal, and the speed of the airflow can be calculated according to the rotation speed of the impeller 911.

[0107] In some embodiments, see Figure 2 , Figure 3 , Figure 4The driving part 20 includes an actuator 21 and a transmission connecting rod 22. The actuator 21 is arranged on the outer side of the housing 10 facing away from the cavity 11. One end of the transmission connecting rod 22 passes through the housing 10 and is connected to the valve stem 60, and the other end is connected to the actuator 21, so as to convert the rotational motion of the actuator 21 into a linear reciprocating motion of the valve stem 60 in the first direction X. Exemplarily, the transmission connecting rod 22 includes a first connecting rod 221, a second connecting rod 222, and a third connecting rod 223. One end of the first connecting rod 221 is rotatably connected to the valve stem 60, and the other end is rotatably connected to the second connecting rod 222. One end of the second connecting rod 222 is rotatably connected to the first connecting rod 221, and the other end is rotatably connected to the third connecting rod 223. One end of the third connecting rod 223 is rotatably connected to the second connecting rod 222, and the other end is rotatably connected to the output end of the actuator 21.

[0108] For example, see Figure 4 Combined with Figure 7 , Figure 8 When the ventilation valve 1 switches from the closed state to the first state, the output end of the actuator 21 drives the third connecting rod 223 to rotate in the positive direction Q, so that the second connecting rod 222 moves toward the actuator 21 along the first direction X, so that the end of the first connecting rod 221 connected to the valve stem 60 moves toward the air outlet 112 along the first direction X, and then the valve stem 60 moves toward the air outlet 112 along the first direction X. At this time, the valve core 50 moves synchronously with the valve stem 60. When the inner annular surface 52 and the fixing portion 40 are spaced apart to form the first air duct 70, and the outer annular surface 51 abuts against the first inner wall 113, the actuator 21 is closed, so that the ventilation valve 1 remains in the first state.

[0109] When the opening of the first air duct 70 needs to be reduced, the output end of the actuator 21 drives the third connecting rod 223 to rotate in the opposite direction to the direction Q, so that the second connecting rod 222 moves away from the actuator 21 along the first direction X, so that the end of the first connecting rod 221 connected to the valve stem 60 moves away from the air outlet 112 along the first direction X, and then the valve stem 60 and the valve core 50 move away from the air outlet 112 along the first direction X, so that the distance between the inner annular surface 52 and the conical surface 411 is reduced to adjust the opening of the first air duct 70. Therefore, the opening of the first air duct 70 can be adjusted by adjusting the inner annular surface 52 of the valve core 50 to slide away from or close to the conical surface 411 along the first direction X, and then the flow rate can be adjusted, and the flow rate changes slowly and the adjustment accuracy is high.

[0110] See also Figure 7 , Fig. 9 Combined with Figure 4When the ventilation valve 1 switches from the first state to the second state, the output end of the actuator 21 can drive the third connecting rod 223 to continue to rotate in the positive direction Q, so that the second connecting rod 222 continues to move toward the actuator 21 along the first direction X, so that the end of the first connecting rod 221 connected to the valve stem 60 continues to move toward the air outlet 112 along the first direction X, and then the valve stem 60 and the valve core 50 continue to move toward the air outlet 112 along the first direction X. When the inner annular surface 52 and the conical surface 411 are spaced apart to form the first air duct 70, and the outer annular surface 51 and the first inner wall 113 are spaced apart to form the second air duct 71, the actuator 21 is closed to keep the ventilation valve 1 in the second state.

[0111] It can be understood that by controlling the output end of the actuator 21 to drive the third connecting rod 223 to rotate forward or reverse, the inner annular surface 52 of the regulating valve core 50 can slide away from or close to the conical surface 411 along the first direction X, and the outer annular surface 51 of the regulating valve core 50 can slide away from or close to the annular diffuser wall 32 along the first direction X, thereby adjusting the opening of the first air duct 70 and the second air duct 71, and then the flow rate can be adjusted with higher precision.

[0112] It is understandable that the present application does not limit the position of the driving unit 20. For example, in some embodiments, the driving unit 20 can also be disposed in its entirety in the cavity 11, so that the space occupied by the ventilation valve 1 in the second direction Y is reduced. Fig.11 The driving unit 20 includes a motor 200, which is arranged on the side of the second connecting rod 822 close to the air outlet 112 along the first direction X. The valve stem 60 includes a screw 600, and the output end of the motor 200 is connected to the screw 600 to drive the screw 600 to rotate. The valve core 50 is connected to the screw 600 through a nut 500. A guide rod 201 is provided between the first connecting rod 821 and the second connecting rod 822. The guide rod 201 is extended along the first direction X, and the valve core 50 is penetrated by the guide rod 201 to prevent the valve core 50 from rotating with the rotation of the screw 600. The external thread on the screw 600 matches the internal thread of the nut 500. When the motor 200 is started, the screw 600 can convert the circumferential motion into the reciprocating motion of the nut 500 in the first direction X, thereby driving the valve core 50 to reciprocate in the first direction X. Exemplarily, the external thread of the screw 600 and the internal thread of the nut 500 are both trapezoidal threads. The present application does not limit the transmission form of the screw 600 and the nut 500. For example, they can also be a ball screw.

[0113] In some embodiments, the present application provides a ventilation system for discharging exhaust gas, harmful gas, particulate matter and other gases in a workspace to outside the workspace (usually outdoors), and the ventilation system includes any of the aforementioned ventilation valves and a fume hood, and the ventilation valve is arranged in the fume hood. The ventilation system generally also includes a ventilation duct assembly, an exhaust fan, a fresh air system, etc. The ventilation valve provided in the present application is not limited to being arranged in a fume hood, and can be arranged in a device in the ventilation system that needs to control the direction of airflow and adjust the air volume. For example, the ventilation valve provided in the present application can be arranged at the pipe connection of different workspaces to adjust the ventilation volume in different areas.

[0114] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A ventilation valve, characterized in that: include: A housing, comprising a cavity, the cavity penetrating the housing along a first direction, and the cavity comprising an air inlet and an air outlet arranged opposite to each other along the first direction; A fixing portion, the fixing portion is disposed in the cavity, the fixing portion is spaced apart from the first inner wall of the cavity along the second direction, and the fixing portion includes a conical surface; A valve core, the valve core is slidably disposed in the cavity along the first direction, the valve core comprises an outer annular surface and an inner annular surface, and the valve core can be switched between a first state and a second state; In the first state, the inner annular surface and the conical surface are spaced apart to form a first air duct between the inner annular surface and the conical surface; In the second state, the outer annular surface is spaced apart from the first inner wall to form a second air duct between the outer annular surface and the first inner wall, and the inner annular surface is spaced apart from the conical surface to form the first air duct.

2. The ventilation valve according to claim 1, characterized in that The fixing portion includes a fixing cone core. Along the first direction, the fixing cone core includes a first portion. The cone surface is provided on the first portion. The first portion is provided in a truncated cone shape.

3. The ventilation valve according to claim 2, characterized in that The fixing portion includes a second part and a third part. Along the first direction, one end of the second part is connected to the first part, and the other end of the second part is connected to the third part. The second part is cylindrical, and the third part is truncated cone.

4. The ventilation valve according to claim 1, characterized in that The ventilation valve can switch between a closed state, the first state, and the second state. In the closed state, the outer annular surface abuts against the first inner wall, the inner annular surface abuts against the fixing portion, and the first air duct and the second air duct are both closed.

5. The ventilation valve according to claim 4, characterized in that The valve core is conically arranged, and the inner annular surface forms a conical hole. In the closed state, the inner surface of the conical hole is arranged in close contact with the conical surface.

6. The ventilation valve according to any one of claims 1 to 5, characterized in that: The first inner wall comprises an annular horizontal wall and an annular diffusion wall, one end of the annular diffusion wall is connected to the annular horizontal wall, and the other end is connected to the second inner wall of the cavity, along the second direction, the annular horizontal wall and the second inner wall are arranged at intervals, along the first direction, the annular diffusion wall is arranged on the side of the annular horizontal wall facing away from the air inlet, the inner diameter of the annular diffusion wall is not less than the inner diameter of the annular horizontal wall, and the inner diameter of the annular diffusion wall increases along the first direction toward the air outlet; In the first state, the outer annular surface abuts against the annular horizontal wall, and in the second state, the outer annular surface is spaced apart from the annular diffusion wall, so that the airflow passes through the annular horizontal wall and the annular diffusion wall in sequence.

7. The ventilation valve according to claim 6, characterized in that The first inner wall includes an annular air inlet wall, one end of the annular air inlet wall is connected to the annular horizontal wall, and the other end is connected to the second inner wall. Along the first direction, the annular air inlet wall is arranged on a side of the annular horizontal wall close to the air inlet. The inner diameter of the annular air inlet wall is not smaller than the inner diameter of the annular horizontal wall, and the inner diameter of the annular air inlet wall increases along the first direction toward the air inlet.

8. The ventilation valve according to claim 7, characterized in that The inner diameter of the annular diffusion wall gradually increases along the first direction toward the air inlet, and the projection of the annular air inlet wall in the second direction is arc-shaped.

9. The ventilation valve according to claim 7, characterized in that It includes a flow detection unit, which is arranged on one side of the cavity close to the air inlet along the first direction and is used to detect the air volume flowing into the air inlet.

10. The ventilation valve according to claim 9, characterized in that The flow detection portion is composed of the annular air inlet wall, the second inner wall and the annular horizontal wall.

11. The ventilation valve according to claim 1, characterized in that It includes a valve stem and a driving part, the valve stem is slidably arranged in the cavity along the first direction, the valve core is arranged on the valve stem, the valve stem is passed through the fixed part, and the fixed part does not move synchronously with the valve stem, and the driving part is connected to the valve stem, and is used to enable the valve stem to drive the valve core to switch between the first state and the second state.

12. The ventilation valve according to claim 11, characterized in that The ventilation valve comprises a fixing frame, the fixing frame is arranged in the cavity, the fixing part is arranged on the fixing frame, and the valve stem is slidably arranged on the fixing frame along the first direction.

13. The ventilation valve according to claim 11 or 12, characterized in that The driving part includes an actuator and a transmission connecting rod. The actuator is arranged on the outer side of the shell facing away from the cavity. One end of the transmission connecting rod passes through the shell and is connected to the valve stem, and the other end is connected to the actuator, which is used to convert the rotational motion of the actuator into linear reciprocating motion of the valve stem in the first direction.

14. The ventilation valve according to claim 1, characterized in that The surface of the outer annular surface is covered with a sealing soft glue, and the surface of the inner annular surface is covered with a sealing soft glue.

15. A ventilation system, characterized in that: Comprising a ventilation valve as described in any one of claims 1-14.

Images