Air pipe check valve and air conditioning system

Abstract

The air pipe check valve comprises a ventilation channel, a first flow guide block, a second flow guide block and a third flow guide block are sequentially fixed in the ventilation channel in the air circulation direction, fourth flow guide blocks are arranged on the upper side and the lower side of the first flow guide block, the middle of the ventilation channel is a variable cross-section section, and the middle of the ventilation channel is provided with an air inlet and an air outlet. According to the check valve and the air conditioning system, resistance and noise are small when air flows in the forward direction, and meanwhile the effect of preventing backflow is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of valve design and relates to an air duct check valve and an air conditioning system. Background Art

[0002] The check valve is one of the commonly used valves in ventilation and air conditioning systems. In air conditioning systems, the check valve can prevent air from flowing back and is mainly used as a safety protection device. The working principle of the traditional air duct check valve is to rely on the closure of the movable blades. When the fan is working normally, the blades are pushed open by the airflow. When the fan stops working, the blades are passively closed by the spring device or the electric device, but long-term use will cause the hinges at the blade connection to loosen or even fall off, causing damage to the system pipe wall. The performance of the spring will decrease over time, and the decrease in elasticity will cause the valve to not be completely closed, resulting in noise, jamming, leakage and other faults. The electric closing device needs to be powered by a battery, and the battery power needs to be checked frequently to ensure that the valve can be closed normally. If the battery is exhausted, the valve will not work properly. If the reverse flow phenomenon occurs, the fluid balance in the system will be destroyed, which may cause the pressure to be out of control, and then pose a safety threat to the equipment and staff, such as explosions and burst pipes.

[0003] The patent with publication number CN218267408U discloses a self-resetting air duct check valve, a self-resetting air duct check valve, which may include a valve body, a valve plate, a retaining ring, a valve plate rotating shaft, a reset actuator, a fixed connection seat, a first connecting rod, a second connecting rod and a sealing member; the two ends of the valve body are respectively connected to the air inlet pipe section and the exhaust pipe section; one end of the valve plate is rotatably fixed to the valve body through the valve plate rotating shaft; the retaining ring is annularly fixed to the inner wall of the valve body, the fixed connection seat is fixed to the top of the retaining ring, the reset actuator is fixed to the top of the valve plate and is connected to the first connecting rod; the first connecting rod is connected to the second connecting rod, and the second connecting rod is connected to the fixed connection seat. For example, the reset actuator and the first connecting rod can be rigidly connected, the fixed connection seat and the second connecting rod can be hinged, and the first connecting rod and the second connecting rod can be hinged through a pin. The sealing member is fixed on the valve body, opposite to the valve plate rotating shaft, and is used to assist in sealing when the valve plate is closed. The reset actuator may include a housing, a transmission gear, a rack plunger and a reset spring. Among them, interconnected cavities and gear cavities are formed in the shell. The hinges of traditional check valves are worn and loosened after long-term use, which leads to poor safety. The spring device will degrade in performance after long-term use, resulting in slow response time and other problems, and it cannot guarantee long-term normal use. In addition, the opening angle of the blades is affected by the wind speed during forward flow. The wind speed is inversely proportional to the forward flow resistance. The lower the wind speed, the greater the resistance and the lower the economy. The higher the wind speed, the greater the noise. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an air duct check valve and an air conditioning system, which have low resistance and noise when the wind flows in the forward direction and have the effect of preventing backflow.

[0005] To achieve the above-mentioned purpose, the present invention discloses an air duct check valve, including a ventilation channel, in which a first guide block, a second guide block and a third guide block are fixed in sequence along the gas flow direction of the ventilation channel, wherein a fourth guide block is arranged on both the upper and lower sides of the first guide block, and the middle part of the ventilation channel is a variable cross-section section, and the variable cross-section section is located between the second guide block and the third guide block.

[0006] Furthermore, the first guide block includes an upper arc plate, a lower arc plate and an end plate, wherein one end of the upper arc plate is connected to one end of the lower arc plate, and the connection position is facing the gas flow direction, the other end of the upper arc plate is connected to the upper end of the end plate, and the other end of the lower arc plate is connected to the lower end of the end plate. Along the gas flow direction, the upper arc plate gradually extends upward and the lower arc plate gradually extends downward. A fourth guide block is located directly above the upper arc plate, and another fourth guide block is located directly below the lower arc plate.

[0007] Furthermore, the end plate is an arc-shaped plate, and a plurality of grooves are provided on the end plate, wherein one of the grooves is directly opposite to a second guide block.

[0008] Furthermore, the variable cross-section section includes a first variable diameter section, a second variable diameter section, a third variable diameter section and a fourth variable diameter section, wherein the first variable diameter section, the second variable diameter section, the third variable diameter section and the fourth variable diameter section are sequentially connected.

[0009] Furthermore, along the gas flow direction, the distance between the upper and lower sides of the first variable diameter section gradually decreases, the distance between the upper and lower sides of the second variable diameter section gradually decreases, the distance between the upper and lower sides of the third variable diameter section gradually increases, and the distance between the upper and lower sides of the fourth variable diameter section gradually increases.

[0010] Furthermore, the upper side and the lower side of the third variable diameter section are both arc-shaped structures, and there are two third guide blocks, wherein one third guide block is facing the upper side of the third variable diameter section, and the other third guide block is facing the lower side of the third variable diameter section.

[0011] Furthermore, the surface of the second guide block facing the incoming gas flow direction is an outwardly convex arc structure, and the surface of the second guide block facing away from the incoming gas flow direction is an inwardly concave arc structure.

[0012] Furthermore, the surface of the third guide block facing the incoming gas flow direction is an outwardly convex arc structure, and the surface of the third guide block facing away from the incoming gas flow direction is a vertical plate structure.

[0013] Furthermore, the height of the first guide block is greater than the minimum distance between the upper side surface and the lower side surface in the variable cross-section segment.

[0014] The invention discloses an air conditioning system, comprising an air duct check valve.

[0015] The present invention has the following beneficial effects:

[0016] During specific operation of the air duct check valve and air conditioning system described in the present invention, after the airflow is diverted by the first guide block and the fourth guide block, the variable cross-section section is gradually pressurized and then gradually depressurized to form a jet-like flow, thereby further increasing the gas flow rate, which is beneficial to the air supply system. At the same time, the resistance and noise of the forward flow are relatively small. In addition, when the fan stops working and the airflow flows back, it is blocked layer by layer under the action of the third guide block, the variable cross-section section, the second guide block and the first guide block to form a large number of vortices, which greatly increases the flow energy consumption and reduces the airflow speed. The airflow energy will be consumed before flowing out of the check valve, making it difficult for the airflow to pass through the check valve and enter the fan, thereby achieving the effect of preventing backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural diagram of the present invention;

[0019] Figure 2 is a side view of the present invention;

[0020] Figure 3 It is the three-dimensional velocity cloud diagram of the present invention when the gas flows in the forward direction;

[0021] Figure 4 It is the three-dimensional velocity cloud diagram of the present invention when the gas flows in the reverse direction.

[0022] Among them, 1 is the first guide block, 2 is the second guide block, 3 is the third guide block, 4 is the fourth guide block, 5 is the ventilation channel, 6 is the variable cross-section section, 61 is the first variable diameter section, 62 is the second variable diameter section, 63 is the third variable diameter section, and 64 is the fourth variable diameter section. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. 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.

[0024] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0027] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0028] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0029] 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, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0031] Embodiment 1

[0032] refer to Figure 1 and Figure 2 The air duct check valve of the present invention includes a ventilation channel 5, in which a first guide block 1, a second guide block 2 and a third guide block 3 are fixed in sequence along the gas flow direction, wherein fourth guide blocks 4 are arranged on both the upper and lower sides of the first guide block 1, and the middle part of the ventilation channel 5 is a variable cross-section section 6, and the variable cross-section section 6 is located between the second guide block 2 and the third guide block 3.

[0033] As an embodiment of the present invention, the first guide block 1 includes an upper arc plate, a lower arc plate and an end plate, wherein one end of the upper arc plate is connected to one end of the lower arc plate, and the connection position is facing the gas flow direction, the other end of the upper arc plate is connected to the upper end of the end plate, and the other end of the lower arc plate is connected to the lower end of the end plate, along the gas flow direction, the upper arc plate gradually extends upward and the lower arc plate gradually extends downward, a fourth guide block 4 is located directly above the upper arc plate, and another fourth guide block 4 is located directly below the lower arc plate.

[0034] As an implementation mode of the present invention, the end plate is an arc-shaped plate, and a plurality of grooves are provided on the end plate, wherein one of the grooves is directly opposite to a second guide block 2 .

[0035] As an embodiment of the present invention, the variable cross-section section 6 includes a first variable diameter section 61, a second variable diameter section 62, a third variable diameter section 63 and a fourth variable diameter section 64, wherein the first variable diameter section 61, the second variable diameter section 62, the third variable diameter section 63 and the fourth variable diameter section 64 are sequentially connected, and along the gas flow direction, the distance between the upper and lower sides of the first variable diameter section 61 gradually decreases, the distance between the upper and lower sides of the second variable diameter section 62 gradually decreases, the distance between the upper and lower sides of the third variable diameter section 63 gradually increases, and the distance between the upper and lower sides of the fourth variable diameter section 64 gradually increases.

[0036] As an embodiment of the present invention, the upper side surface and the lower side surface of the third variable diameter section 63 are both arc-shaped structures, and the number of third guide blocks 3 is two, wherein one third guide block 3 is facing the upper side surface of the third variable diameter section 63, and the other third guide block 3 is facing the lower side surface of the third variable diameter section 63.

[0037] As an implementation manner of the present invention, the upper side surface and the lower side surface of the fourth guide block 4 are both arc-shaped structures.

[0038] As an embodiment of the present invention, the surface of the second guide block 2 facing the gas flow direction is a convex arc structure, and the surface of the second guide block 2 facing away from the gas flow direction is a concave arc structure.

[0039] As an embodiment of the present invention, the surface of the third guide block 3 facing the gas flow direction is a convex arc structure, and the surface of the third guide block 3 facing away from the gas flow direction is a vertical plate structure.

[0040] As an implementation manner of the present invention, the height of the first guide block 1 is greater than the minimum distance between the upper side surface and the lower side surface of the variable cross-section segment 6 .

[0041] It should be noted that the reference Figure 3 and Figure 4 , the traditional check valve will cause the hinges at the blade connection to loosen after long-term use, and the elasticity of the spring device used to close the fan valve blades will deteriorate, the blades cannot be completely closed, and the airflow will flow back, causing damage to the fan; the use of electric devices to close the valve for a long time will also cause various problems, such as insufficient battery power, leakage, stagnation, noise, etc. These failures may have a greater impact on the entire air conditioning system. The present invention does not have any movable parts, and does not require electricity to drive the valve to work, which can ensure the service life and safety, and can effectively prevent gas backflow.

[0042] Embodiment 2

[0043] refer to Figure 1 and Figure 2The air conditioning system of the present invention includes an air duct check valve, which includes a ventilation channel 5, in which a first guide block 1, a second guide block 2 and a third guide block 3 are fixed in sequence along the gas flow direction, wherein the first guide block 1 is provided with a fourth guide block 4 on both sides of the upper and lower sides, and the middle part of the ventilation channel 5 is a variable cross-section section 6, and the variable cross-section section 6 is located between the second guide block 2 and the third guide block 3; the first guide block 1 includes an upper arc plate, a lower arc plate and an end plate, wherein one end of the upper arc plate is connected to one end of the lower arc plate, and the connection position is directly opposite to the gas In the incoming flow direction, the other end of the upper arc plate is connected to the upper end of the end plate, and the other end of the lower arc plate is connected to the lower end of the end plate. Along the gas flow direction, the upper arc plate gradually extends upward and the lower arc plate gradually extends downward. A fourth guide block 4 is located directly above the upper arc plate, and another fourth guide block 4 is located directly below the lower arc plate; the variable cross-section segment 6 includes a first diameter reducing segment 61, a second diameter reducing segment 62, a third diameter reducing segment 63 and a fourth diameter reducing segment 64, wherein the first diameter reducing segment 61, the second diameter reducing segment 62, the third diameter reducing segment 63 and the fourth diameter reducing segment 64 are sequentially connected.

[0044] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0045] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A duct check valve, characterized in that: The invention comprises a ventilation channel (5), wherein a first guide block (1), a second guide block (2) and a third guide block (3) are fixed in sequence along the gas flow direction in the ventilation channel (5), wherein a fourth guide block (4) is arranged on both upper and lower sides of the first guide block (1), and the middle part of the ventilation channel (5) is a variable cross-section section (6), and the variable cross-section section (6) is located between the second guide block (2) and the third guide block (3).

2. The air duct check valve according to claim 1, characterized in that: The first guide block (1) comprises an upper arc plate, a lower arc plate and an end plate, wherein one end of the upper arc plate is connected to one end of the lower arc plate, and the connection position is opposite to the gas flow direction, the other end of the upper arc plate is connected to the upper end of the end plate, and the other end of the lower arc plate is connected to the lower end of the end plate. Along the gas flow direction, the upper arc plate gradually extends upward and the lower arc plate gradually extends downward. A fourth guide block (4) is located directly above the upper arc plate, and another fourth guide block (4) is located directly below the lower arc plate.

3. The air duct check valve according to claim 2, characterized in that: The end plate is an arc-shaped plate and is provided with a plurality of grooves, one of which is directly opposite to a second guide block (2).

4. The air duct check valve according to claim 1, characterized in that: The variable cross-section section (6) comprises a first variable diameter section (61), a second variable diameter section (62), a third variable diameter section (63) and a fourth variable diameter section (64), wherein the first variable diameter section (61), the second variable diameter section (62), the third variable diameter section (63) and the fourth variable diameter section (64) are sequentially connected.

5. The air duct check valve according to claim 4, characterized in that: Along the gas flow direction, the distance between the upper and lower sides of the first diameter-changing section (61) gradually decreases, the distance between the upper and lower sides of the second diameter-changing section (62) gradually decreases, the distance between the upper and lower sides of the third diameter-changing section (63) gradually increases, and the distance between the upper and lower sides of the fourth diameter-changing section (64) gradually increases.

6. The air duct check valve according to claim 4, characterized in that: The upper side surface and the lower side surface of the third diameter-changing section (63) are both arc-shaped structures, and the number of the third guide blocks (3) is two, wherein one third guide block (3) faces the upper side surface of the third diameter-changing section (63), and the other third guide block (3) faces the lower side surface of the third diameter-changing section (63).

7. The air duct check valve according to claim 1, characterized in that: The surface of the second guide block (2) facing the gas flow direction is an outwardly convex arc structure, and the surface of the second guide block (2) facing away from the gas flow direction is an inwardly concave arc structure.

8. The air duct check valve according to claim 1, characterized in that: The surface of the third guide block (3) facing the incoming gas flow direction is an outwardly convex arc structure, and the surface of the third guide block (3) facing away from the incoming gas flow direction is a vertical plate structure.

9. The air duct check valve according to claim 1, characterized in that: The height of the first guide block (1) is greater than the minimum distance between the upper side surface and the lower side surface in the variable cross-section section (6).

10. An air conditioning system, characterized in that: Including the air duct check valve according to claim 1.

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