Ventilation devices and ventilation systems

Abstract

The present invention discloses a ventilation device and a ventilation system, the ventilation device comprising: a ventilator having two ports in the axial direction; a fan arranged in the ventilator to allow airflow to pass through the ventilator; a regenerator arranged in the ventilator to absorb heat in the airflow; wherein: a blocking portion for blocking airflow is formed on the radial periphery of the fan, and the blocking portion is used to make the flow cross section of the fan smaller than the flow cross section of the regenerator. The present invention sets the flow cross section of the fan smaller than the flow cross section of the regenerator, thereby enabling the fan and the regenerator to form a reasonable pressure match and flow rate match.

Description

Technical Field

[0001] The invention relates to the technical field of building ventilation, and in particular to a reciprocating heat recovery ventilation device. Background Art

[0002] It is well known that indoor ventilation can effectively reduce the indoor carbon dioxide content, thereby improving the comfort of indoor people. However, the natural ventilation process may cause energy loss. For example, in winter, indoor hot air is directly discharged to the outside and outdoor cold air directly enters the room, which is bound to increase the energy consumption of heating equipment; for example, in summer, indoor cold air is directly discharged to the outside and outside hot air directly enters the room, which is bound to increase the energy consumption of refrigeration equipment.

[0003] In order to recover the heat in the air, in the prior art, mechanical ventilation is used to ventilate the indoor and outdoor areas. For example, Chinese patent application number 201120515081.0 discloses a reciprocating heat recovery fresh air system, which can be arranged on the junction wall between indoor and outdoor areas. The system has a cylindrical ventilator, a DC motor (actually a fan) arranged in the ventilator, and a heat storage body arranged on one side of the axial direction of the fan. The operation of the fan causes the hot air to pass through the heat storage body, and the heat storage body is used to absorb the heat in the hot air. The air that absorbs the heat is discharged outdoors (if it is winter) or enters indoors (if it is summer), thereby realizing the recovery of heat in the air.

[0004] However, the above reciprocating heat recovery fresh air system has the following defects:

[0005] The fan and the heat storage body both fill the entire cross-section of the ventilator. The heat storage, heat exchange capacity and flow resistance characteristics of the heat storage body do not match the axial flow velocity and pressure characteristics of the axial flow fan, which causes the two to not match in terms of allowing airflow to pass through. Specifically, because the fan and the heat storage body both occupy the entire cross-section of the ventilator, they have the same flow cross-section for the airflow, and therefore have the same axial flow velocity. However, the axial airflow velocity of the commonly used axial flow fan is much greater than 2 meters per second, and the total pressure is not greater than 200 Pa; for example, for a regenerator that is about 15 cm thick, the pressure difference corresponding to a flow rate greater than 2 meters per second is much greater than 200 Pa, while the airflow velocity corresponding to a pressure difference less than 200 Pa is usually less than 0.5 meters per second. Therefore, in actual operation, the performance parameters of the axial flow fan and the heat storage body cannot match at all. As a result, the ventilation system is inefficient during operation, the air exchange volume is limited, and it is not suitable for scenarios with higher ventilation volume requirements.

[0006] In addition, the entire ventilation device has a large size in the axial direction. Summary of the invention

[0007] In view of at least one of the above-mentioned technical problems existing in the prior art, the present invention provides a ventilation device and a ventilation system.

[0008] The technical solution adopted by the present invention is:

[0009] A ventilation device, comprising:

[0010] a ventilator having two ports in the axial direction;

[0011] a fan disposed in the ventilator to allow air to flow through the ventilator;

[0012] A regenerator, which is arranged in the ventilator and is used to absorb heat in the airflow; wherein:

[0013] A blocking portion for blocking airflow is formed on the radial periphery of the fan, and the blocking portion is used to make the flow cross section of the fan smaller than the flow cross section of the regenerator.

[0014] Preferably, a partition is provided in the ventilator, and the fan is provided in the partition and passes through the partition; wherein:

[0015] The partition plate on the periphery of the fan forms the blocking portion.

[0016] Preferably, the partition is arranged in the ventilator in a manner perpendicular to the axial direction of the ventilator.

[0017] Preferably, the fan penetrates the partition in such a manner that its axial direction is consistent with the axial direction of the ventilator.

[0018] Preferably, the fan penetrates the partition in a manner that its axial direction is perpendicular to the axial direction of the ventilator.

[0019] Preferably, the partition has two arc-shaped walls that expand in thickness respectively, and the two arc-shaped walls jointly define a through hole that is perpendicular to the axial direction of the ventilator, and the fan passes through the through hole.

[0020] Preferably, the heat regenerators include two, and the two heat regenerators are arranged on both sides of the fan along the axial direction of the ventilator.

[0021] Preferably,

[0022] The ventilator is in the shape of a polygonal frame.

[0023] or

[0024] The ventilator is cylindrical;

[0025] or

[0026] The ventilator is in the shape of an elliptical cylinder.

[0027] Preferably, the aforementioned heat regenerator is a porous material in the form of foam, honeycomb, particle stacking, or wire mesh stacking, and the porous material is formed by one or more selected from inorganic oxides, carbides or metals.

[0028] Preferably, the aforementioned fan is a reversible fan, and the blade profile of the impeller is S-shaped.

[0029] The invention also discloses a ventilation system, comprising the ventilation device mentioned above.

[0030] Compared with the prior art, the ventilation device and ventilation system disclosed in the present invention have the following beneficial effects:

[0031] The present invention sets the flow cross section of the fan to be smaller than the flow cross section of the regenerator, so that the fan and the regenerator can form reasonable pressure matching and flow rate matching.

[0032] By making the fan and the regenerator form a reasonable pressure match and flow rate match, the ventilation volume of the ventilation system is no longer restricted. Different fans and regenerators can be selected according to needs for reasonable matching, and the entire ventilation system can always run at a high efficiency.

[0033] This summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the invention. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0035] Figure 1 A perspective exploded view of a ventilation device provided by an embodiment of the present invention.

[0036] Figure 2 A three-dimensional assembly view of a ventilation device provided by an embodiment of the present invention.

[0037] Figure 3 for Figure 2 AA section view.

[0038] Figure 4This is a diagram showing the airflow streamline effect when the ventilation device provided by an embodiment of the present invention is in use.

[0039] Reference numerals:

[0040] 10-ventilator; 20-fan; 30-regenerator; 40-partition; 41-arc wall; 42-perforation; 50-grid. DETAILED DESCRIPTION

[0041] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] In order to keep the following description of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0043] The invention discloses a ventilation device, which belongs to a mechanical ventilation device and is used to be arranged on a junction wall between indoors and outdoors, for example, on a wall or a window wall of a building.

[0044] like Figures 1 to 4 As shown, the ventilation device includes: a ventilator 10 , a fan 20 and a regenerator 30 .

[0045] There is no limitation on the shape and structure of the ventilator 10, and it can be of various structures. For example, the ventilator 10 is a polygonal frame structure, such as Figure 1 As shown, the ventilator 10 is a quadrilateral frame structure, and for another example, the ventilator 10 is a cylindrical structure with a circular cross section, or the ventilator 10 is a cylindrical structure with an elliptical cross section. It is easy to understand that the ventilator 10 has two ports in the axial direction, and the airflow flows through the ventilator 10 through the ports.

[0046] It should be noted that the so-called axial direction of the ventilator 10 refers to the direction indicated by the axis of the ventilator 10 , and the so-called axis of the ventilator 10 refers to the extension direction of the ventilator 10 , and the axis vertically runs through the two ports of the ventilator 10 .

[0047] The regenerator 30 is used to absorb heat in the airflow, and the regenerator 30 is arranged in the ventilator 10. As required, the regenerator 30 can be arranged only on one side of the ventilator 10 along the axial direction, or on both sides of the ventilator 10. On each side of the ventilator 10, the regenerator 30 can be arranged on a part of the cross section of the ventilator 10 along the axial direction. For example, when the temperature difference between the outdoor and indoor is not large, the regenerator can be arranged on a part of the cross section of the ventilator 10 along the axial direction, and the regenerator is not arranged on the other part of the cross section.

[0048] The reheater 30 can also be set to fill the entire axial cross-section of the ventilator 10, so that the flow cross-section of the reheater 30 allowing airflow is equal to the flow cross-section of the ventilator 10 allowing airflow. In this way, the airflow flowing through the ventilator 10 not only flows through the reheater 30 in its entirety, but also flows through the reheater 30 over the entire flow cross-section of the ventilator 10.

[0049] The fan 20 is arranged in the ventilator 10. The fan 20 circulates the air between the indoor and outdoor spaces by passing the airflow through the ventilator 10. Under the action of the fan 20, the airflow passes through the regenerator 30 at a certain flow rate. The regenerator 30 is used to recover the heat in the airflow. For example, when the fan 20 operates in an environment where the outdoor temperature is higher than the indoor temperature, the outside (outdoor) hot air enters the ventilator 10 and flows through the regenerator 30. The regenerator 30 absorbs the heat in the airflow. The airflow with the absorbed heat enters the room at a lower temperature. On the one hand, it can reduce the load of the refrigeration equipment to maintain the indoor low temperature. On the other hand, the absorbed heat can be used for other purposes. For another example, when the fan 20 operates in an environment where the outdoor temperature is lower than the indoor temperature, the indoor hot air enters the ventilator 10 and flows through the regenerator 30. The regenerator 30 absorbs the heat in the airflow. The airflow with the absorbed heat is discharged outdoors at a lower temperature. The heat absorbed by the regenerator 30 can be used to heat the indoor air or for other purposes.

[0050] In the present invention, what is particularly critical is that a blocking portion is formed on the radial periphery of the fan 20, and the blocking portion is used to prevent the airflow from passing through, so that the airflow can only pass through the fan 20. The blocking portion occupies a part of the cross-section of the ventilator 10, thereby making the flow cross-section of the fan 20 that allows the airflow to pass through smaller than the flow cross-section of the regenerator 30 that allows the airflow to pass through.

[0051] The present invention sets the flow cross section of the fan 20 to be smaller than the flow cross section of the regenerator 30 by providing a blocking portion for preventing the airflow from passing therethrough, thereby enabling the fan 20 and the regenerator 30 to form a reasonable pressure match and flow rate match.

[0052] There is no particular limitation on the barrier portion that makes the flow cross section of the fan 20 smaller than the flow cross section of the regenerator 30. In some preferred embodiments, Figure 1 , Figure 3 As shown, a barrier portion is formed around the fan 20 by disposing a partition 40 in the ventilator 10. Specifically, the partition 40 occupies the entire cross-section of the ventilator 10, and the fan 20 is disposed on the partition 40 in a manner of penetrating the partition 40. The partition 40 around the fan 20 serves as a barrier portion, and the airflow can only flow from one side of the partition 40 to the other side through the fan 20.

[0053] Preferably, the partition 40 is arranged in the ventilator 10 in a manner perpendicular to the axial direction of the ventilator 10, so that the space occupied by the partition 40 in the axial direction of the ventilator 10 can be minimized. Here, "perpendicular" means that the angle formed by the partition 40 and the axial direction of the ventilator 10 is close to 90 degrees, for example, 80 to 90 degrees, preferably 85 to 90 degrees.

[0054] As the manner in which the fan 20 penetrates the partition plate 40, for example, the following may be cited:

[0055] Method 1: Make the axial direction of the fan 20 consistent with the axial direction of the ventilator 10 (not shown in the drawings). The "consistent" here is not strictly limited to the axial direction of the fan 20 and the axial direction of the ventilator 10 forming an angle of 0 degrees, as long as the axial direction of the fan 20 is roughly consistent with the axial direction of the ventilator 10, for example, the angle formed by the axial direction of the fan 20 and the axial direction of the ventilator 10 is about 0 to 10 degrees, and can further be, for example, about 0 to 5 degrees.

[0056] Method 2: Figure 1 , Figure 3 As shown, the axial direction of the fan 20 is perpendicular to the axial direction of the ventilator 10. At this time, the axial direction of the fan 20 is parallel to the plane where the partition 40 is located. Specifically, an arc wall 41 is formed in the middle of the partition 40, which expands toward both sides in the axial direction. The two arc walls 41 jointly define a through hole 42. The fan 20 passes through the through hole 42, and the arc wall 41 covers the outside of the fan 20. The aforementioned "perpendicular" is not limited to a strict "90 degrees". The angle formed by the axial direction of the fan 20 and the axial direction of the ventilator 10 can be, for example, 80 to 90 degrees, preferably 85 to 90 degrees.

[0057] In addition, the angle formed by the axial direction of the fan 20 and the axial direction of the ventilator 10 may also be other angles, such as 15 to 70 degrees, without any particular limitation.

[0058] Preferably, the fan 20 passes through the partition 40 in the second mode, which has the following advantages:

[0059] Compared with the first method of penetrating perpendicularly to the partition, the second method can better control the axial thickness of the ventilator, and the matching of the reversible fan 20 and the regenerator 30 is more flexible.

[0060] In particular, when the fan 20 has a relatively large axial dimension, the second method can reduce the axial dimension of the ventilator 10 occupied by the fan 20, thereby making the axial dimension of the ventilator 10 smaller.

[0061] There is no limitation on the material of the regenerator 30. As long as the purpose of heat recovery can be achieved, the skilled person in the art may choose it appropriately. The regenerator 30 may be, for example, a porous material. By using a porous material, the heat utilization efficiency can be further improved. As such a porous material, for example, a foam, a honeycomb, a porous material formed by stacking particles or a wire mesh can be listed. As a porous material, it can be formed by one or more selected from inorganic oxides, carbides or metals, such as a common ceramic material, cast iron and metal materials, or a composite phase change material.

[0062] The regenerator 30 may be arranged only on one side of the ventilator 10, or may be arranged on both sides of the ventilator 10. In some preferred embodiments, the regenerator 30 is arranged on both sides of the fan 20 along the ventilator 10. There is no particular limitation on the area ratio of the cross section of the ventilator 10 occupied by the regenerator 30 arranged on each side of the ventilator 10. The regenerator 30 may occupy only a part of the cross section of the ventilator 10, or may fill the cross section of the ventilator 10. It is preferred that the regenerator 30 is arranged to fill the entire cross section of the ventilator 10 along the axial direction, so that the airflow flows through the regenerator 30 over the entire flow cross section of the ventilator 10.

[0063] When the regenerators 30 are provided on both sides of the ventilator 10, the fan 20 can be configured as a reversible fan capable of changing the direction of rotation, so that two-way flow of air from indoors to outdoors and from outdoors to indoors can be achieved.

[0064] The fan 20 is a reversible fan. To make the fan 20 more efficient, the impeller blades may be S-shaped, and the axial flow impeller may be provided with completely symmetrical front and rear guide vanes with an installation angle of 90° upstream and downstream.

[0065] In some preferred embodiments, grilles 50 are provided on both axial ports of the ventilator 10 , and the grilles 50 have a limiting effect on the regenerator 30 and also have a rainproof function.

[0066] The specific embodiments of the ventilation device provided by the present invention are introduced below.

[0067] In the ventilation device: a regenerator 30 is arranged on both sides of the ventilator 10, and the regenerator 30 on each side is formed by splicing 4 pieces of honeycomb ceramic materials with a size of 0.2 m × 0.2 m × 0.075 m, and the air flow area is 0.16 square meters. The porosity of the honeycomb ceramic is 0.75, and the pore size is about 3.5 mm. The fan 20 has an outer diameter of 18 cm and an axial length of 8 cm. The design point speed is 3600 rpm, the flow rate is 120 cubic meters per hour, and the pressure is 100 Pa. The overall dimensions of the ventilator 10 are 0.41 m × 0.41 m × 0.36 m. The axial speed of the airflow through the fan 20 is about 2.0 m / s, and it flows through the regenerator 30 with a thickness of 0.15 m (the regenerator is composed of two parts, and the total thickness is 2×0.075 m, which is equal to 0.15 m) at a speed of about 0.20 m / s, and the total pressure loss is 100 Pa. Figure 4 As shown, the airflow flows through the regenerator 30 at an apparent velocity of 0.20 m / s, converges to the inlet of the fan 20 on one side of the partition 40, flows through the fan 20 at an average velocity of about 3.0 m / s, and is pressurized by 100 Pa, and then flows through the regenerator 30 on the other side at 0.20 m / s. The reversible fan 20 runs in a cycle of "forward rotation for 1 minute, reverse rotation for 1 minute", which can provide 120 cubic meters of fresh air per hour for the room, saving 70-90% energy. The ventilation device of this scheme is used in pairs, which is particularly suitable for primary and secondary school classrooms.

[0068] The ventilation device can be used, for example, for classroom ventilation. One fan can be installed on each of the front and rear windows of the classroom and run simultaneously. Furthermore, the running direction of the fans in the ventilation devices installed at the front and rear of the classroom can be set as needed. For example, one fan can be set to rotate forward so that the airflow flows from the outside to the inside, while the other fan can rotate in the reverse direction so that the airflow flows from the inside to the outside.

[0069] The present invention also discloses a ventilation system, which includes the above-mentioned ventilation device and also includes: a sensor installed indoors for measuring temperature, a sensor installed indoors for measuring carbon dioxide content, and a sensor for detecting PM2.5. The system controls the operating timing and speed of the fan 20 based on the detection results of these sensors, thereby adjusting the indoor air environment.

[0070] In addition, although exemplary embodiments have been described in the present invention, the scope includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims will be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the implementation of this application, and their examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0071] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, a person of ordinary skill in the art can use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features can be grouped together to simplify the present invention. This should not be interpreted as an intention that a disclosed feature that is not required to be protected is necessary for any claim. On the contrary, the subject matter of the present invention may be less than all the features of a specific disclosed embodiment. Thus, the following claims are incorporated into the specific embodiments as examples or embodiments, wherein each claim is independently used as a separate embodiment, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the attached claims and the full scope of equivalent forms granted by these claims.

[0072] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A ventilation device, characterized in that: include: a ventilator having two ports in the axial direction; a fan disposed in the ventilator to allow air to flow through the ventilator; A regenerator, which is arranged in the ventilator and is used to absorb heat in the airflow; wherein: The fan has a blocking portion formed on its radial periphery for blocking airflow, and the blocking portion is used to make the flow cross section of the fan smaller than the flow cross section of the regenerator. A partition is provided in the ventilator, and the fan is provided in the partition and passes through the partition; The partition plate on the periphery of the fan forms the blocking portion, The partition is arranged in the ventilator in a manner perpendicular to the axial direction of the ventilator. The fan penetrates the partition in a manner such that its axial direction is perpendicular to the axial direction of the ventilator. The partition has two arc-shaped walls that expand in thickness respectively, and the two arc-shaped walls jointly define a through hole that is perpendicular to the axial direction of the ventilator, and the fan passes through the through hole. The fan is a reversible fan, and the blade profile of the fan blades is S-shaped.

2. The ventilation device according to claim 1, characterized in that The heat regenerators include two heat regenerators, which are arranged on both sides of the fan along the axial direction of the ventilator.

3. The ventilation device according to claim 1, characterized in that The ventilator is in the shape of a polygonal frame. or The ventilator is cylindrical; or The ventilator is in the shape of an elliptical cylinder.

4. The ventilation device according to claim 1, characterized in that The regenerator is a porous material in the form of foam, honeycomb, accumulated particles or stacked wire meshes, and the porous material is formed by one or more selected from inorganic oxides, carbides or metals.

5. A ventilation system, characterized in that: Comprising a ventilation device as claimed in any one of claims 1 to 4.

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