Volumetric fan

Abstract

The positive displacement fan comprises a volute and a plurality of blades, an air inlet and an air outlet are formed in the volute, two bearings are fixedly arranged in the volute in the axial direction of the volute, a rotor is eccentrically arranged in the two bearings, an air chamber is formed between the bearings and the rotor, the rotor comprises an inner rotating frame and an outer annular frame, and the inner rotating frame and the outer annular frame are fixedly connected. First sliding grooves allowing the blades to slide in the radial direction of the volute are formed in the outer annular frame, the inner sides of the blades are connected with the inner rotating frame through elastic telescopic assemblies, and the outer sides of the blades penetrate through the first sliding grooves under the elastic force of the elastic telescopic assemblies to be in interference fit with the two bearings. Compared with the prior art, a larger air chamber can be provided more conveniently, the thickness of the bearing does not need to be increased to the size of the radial length of the air chamber specially, compared with the arrangement of a single bearing, only two universal bearings are adopted, the air inlet and the air outlet can be communicated with a communicating opening in the volute, and the overall manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a positive displacement fan. Background Art

[0002] A positive displacement fan is a fan that generates airflow by changing volume. It usually consists of one or more chambers with changing volume and a drive mechanism. When the volume of the chamber changes, airflow is generated. Positive displacement fans can be divided into different types according to the shape of the chamber and the way the volume changes. One type is the vane fan.

[0003] The rotor of the sliding vane fan is a segregated rotor, and the rotor is usually inlaid with sliding blades. Under the action of the spring on the rotor, the blades abut against the inner wall of the cylinder. At this time, the rotor and the sliding vanes embedded in the rotor form spaces of unequal volumes with the inner wall of the cylinder. During the operation of the sliding vane fan, the sliding vanes move along the inner wall of the cylinder to suck in, compress and discharge air. In this process, since the blades are in direct contact with the cylinder, the friction surface is large, which easily generates high temperature and abnormal noise. The blades and the cylinder are also prone to wear and have a short service life, and need to be optimized and improved.

[0004] In view of the above problems, some improvements have been proposed in the prior art. For example, a Chinese patent with patent number CN 220227177 U discloses a new type of positive displacement fan, including: a cylinder body, a bearing, a rotor, a blade, a sliding pin and a spring; the interior of the cylinder body is hollow to form an air chamber, the cylinder body is provided with an air inlet and an air outlet, both of which are connected to the air chamber, the bearing is fixed in the air chamber, the rotor is eccentrically arranged in the bearing, and the rotor is provided with a plurality of groups of mounting grooves arranged relatively along the radial direction of the rotor, each mounting groove is provided with a blade, a sliding pin and a spring, wherein the blade is located on the outside and the spring is located on the inside, one end of the sliding pin is connected to the spring, and the other end is abutted against the blade, and under the action of the spring, the sliding pin pushes the blade outward until it abuts against the inner ring of the bearing.

[0005] However, this type of positive displacement fan adopts a single-bearing structure and is generally used for fans that do not require a large amount of air. In order to allow the air inlet and outlet to be connected to the air chamber, it is necessary to open an opening at the side end of the bearing. In addition, in order to provide sufficient wind speed, when it is necessary to increase the radial length of the air chamber, the thickness of the bearing needs to be increased to the same size as the radial length of the air chamber, which also increases the manufacturing cost of the fan in disguised form. Utility Model Content

[0006] Purpose of the utility model: In order to overcome the problems existing in the prior art, the utility model provides a volumetric fan. By setting two bearings, it is possible to more conveniently provide a larger wind speed space without deliberately increasing the thickness of the bearing to the size of the radial length of the air chamber. Compared with the setting of a single bearing, two universal bearings are sufficient, and the air inlet and outlet and the connecting port in the volute can be directly set between the two bearings, and the overall manufacturing cost is low.

[0007] In order to solve the above problems, the utility model adopts the following technical solutions:

[0008] A volumetric fan comprises a volute and a plurality of blades, the volute is provided with an air inlet and an air outlet, two bearings are fixedly arranged inside the volute along its axial direction, rotors are eccentrically arranged inside the two bearings, an air chamber is formed between the bearings and the rotors, the rotor comprises an inner rotating frame and an outer annular frame which are fixedly connected, the outer annular frame is provided with a first slide groove for the blades to slide radially along the volute, the inner side of the blade and the inner rotating frame are connected by an elastic telescopic component, and the outer side of the blade passes through the first slide groove under the elastic force of the elastic telescopic component and is interference fit with the two bearings.

[0009] Preferably, the elastic telescopic component includes a spring, a sliding pin, a second sliding groove radially opened on the inner rotating frame, and a bayonet opened at the inner end of the blade, the bayonet penetrates the blade along the axial direction of the volute, one end of the sliding pin is fixedly connected to the spring and slidably connected in the second sliding groove, and the other end extends to the bottom of the bayonet and abuts against the bottom wall of the bayonet, one end of the spring is fixed to the bottom of the second sliding groove, and the other end is fixedly connected to the sliding pin.

[0010] Preferably, one end of the sliding pin that is slidably connected in the second sliding groove is an annular opening, and the position where the spring is connected to the sliding pin is at the bottom of the opening.

[0011] Preferably, the second sliding groove is an annular groove, and the spring is sleeved on a cylindrical fixing block at the center of the annular groove.

[0012] Preferably, the diameter of one end of the sliding pin abutting against the bayonet gradually decreases outwards.

[0013] Preferably, the air inlet and the air outlet and the connecting opening in the volute are all between two bearings.

[0014] Preferably, each blade is provided with two elastic telescopic components along the axial direction of the volute.

[0015] Preferably, four of the first slide grooves and four of the blades are provided.

[0016] Preferably, the bearing is a ball bearing.

[0017] Beneficial effects: Compared with the prior art, the utility model has the following advantages: by setting two bearings, it is possible to more conveniently provide a larger air chamber without deliberately increasing the thickness of the bearing to the size of the radial length of the air chamber. Compared with the setting of a single bearing, two universal bearings are sufficient, and the air inlet and the air outlet and the connecting port in the volute can be directly set between the two bearings, and the overall manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the exterior of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of the interior of the utility model;

[0020] Figure 3 This is a three-dimensional internal diagram of the utility model after removing the volute;

[0021] Figure 4 This is a three-dimensional diagram of the utility model without blades;

[0022] Figure 5 It is a cross-sectional view of the elastic telescopic component of the utility model;

[0023] Figure 6 It is an enlarged cross-sectional view of the second chute of the utility model;

[0024] Among them: 1. volute; 2. bearing; 3. rotor; 31. inner rotating frame; 311. second slide groove; 32. outer annular frame; 321. first slide groove; 4. blades; 41. bayonet; 5. spring; 6. sliding pin; 61. opening; 7. air inlet; 8. air outlet. DETAILED DESCRIPTION

[0025] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0026] Any feature disclosed in this specification (including any additional claims, abstracts and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0027] like Figure 1-6As shown, a volumetric fan comprises a volute 1 and a plurality of blades 4, the volute is provided with an air inlet 7 and an air outlet 8, two bearings 2 are fixedly arranged inside the volute 1 along its axial direction, rotors 3 are eccentrically arranged inside the two bearings 2, an air chamber is formed between the bearings 2 and the rotor 3, the rotor 3 comprises an inner rotating frame 31 and an outer annular frame 32 which are fixedly connected, a first slide groove 321 for the blades to slide radially along the volute is opened on the outer annular frame 32, the inner side of the blade 4 is connected to the inner rotating frame 31 by an elastic telescopic component, and the outer side of the blade 4 passes through the first slide groove and is interference fit with the two bearings 2 under the elastic force of the elastic telescopic component.

[0028] By setting two bearings, a larger air chamber can be provided more conveniently without deliberately increasing the thickness of the bearing to the size of the radial length of the air chamber. Compared with the setting of a single bearing, two universal bearings can be used, and the overall manufacturing cost is lower. The setting of the first slide groove 321 enables the blades to move only in the radial direction of the rotor, thereby improving the stability of the blade operation.

[0029] In this embodiment, the elastic telescopic component includes a spring 5, a sliding pin 6, a second sliding groove 311 radially opened on the inner rotating frame 31, and a bayonet 41 opened at the inner end of the blade 4, and the bayonet 41 penetrates the blade along the axial direction of the volute. One end of the sliding pin 6 is fixedly connected to the spring 5 and slidably connected in the second sliding groove 311, and the other end extends to the bottom of the bayonet 41 and abuts against the bottom wall of the bayonet. One end of the spring 5 is fixed to the bottom of the second sliding groove 311, and the other end is fixedly connected to the sliding pin 6.

[0030] With this structure, even if the rotor is eccentrically arranged, the blade can always be interference-fitted with the bearing when the sliding pin and the spring are rotated to different positions.

[0031] In this embodiment, the second sliding groove 311 is an annular groove, and the spring is sleeved on a cylindrical fixing block at the center of the annular groove.

[0032] In this embodiment, the diameter of one end of the sliding pin abutting against the bayonet gradually decreases outwards, so as to cooperate with the bayonet to form a stable connection.

[0033] In this embodiment, one end of the sliding pin 6 that is slidably connected in the second sliding groove 311 is an annular opening 61 , and the position where the spring 5 is connected to the sliding pin 6 is at the bottom of the opening 61 .

[0034] The sliding pin adopts an annular opening, and the second sliding groove originally needs to be set to the length of the sliding end of the sliding pin plus the length of the spring to meet its working requirements. While ensuring the sliding length of the sliding pin in the second sliding groove, the length of the second sliding groove is reduced so that it only needs to exceed the length of the sliding end of the sliding pin, thereby reducing the manufacturing cost.

[0035] In this embodiment, the air inlet 7 and the air outlet 8 communicating with the volute 1 are both between the two bearings 2 .

[0036] In this embodiment, each blade 4 is provided with two elastic telescopic components along the axial direction of the volute 1 .

[0037] In this embodiment, four first sliding grooves 321 and four blades 4 are provided.

[0038] In this embodiment, the bearing 2 is a ball bearing.

[0039] The purpose of the above embodiments is to exemplarily reproduce and deduce the technical solution of the utility model, and to fully describe the technical solution, purpose and effect of the utility model. Its purpose is to make the public understand the disclosed content of the utility model more thoroughly and comprehensively, and it does not limit the protection scope of the utility model.

[0040] The above embodiments are not exhaustive enumerations based on the present invention, and there may be multiple other implementations not listed. Any replacement and improvement made without violating the concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A positive displacement fan, characterized in that: The invention comprises a volute (1) and a plurality of blades (4), wherein the volute is provided with an air inlet (7) and an air outlet (8), wherein two bearings (2) are fixedly arranged inside the volute (1) along its axial direction, wherein rotors (3) are eccentrically arranged inside the two bearings (2), and an air chamber is formed between the bearings (2) and the rotor (3), wherein the rotor (3) comprises an inner rotating frame (31) and an outer annular frame (32) which are fixedly connected, wherein a first slide groove (321) is provided on the outer annular frame (32) for the blades to slide radially along the volute, wherein the inner side of the blade (4) and the inner rotating frame (31) are connected via an elastic telescopic component, and the outer side of the blade (4) passes through the first slide groove under the elastic force of the elastic telescopic component to be interference fit with the two bearings (2).

2. A positive displacement fan according to claim 1, characterized in that: The elastic telescopic component comprises a spring (5), a sliding pin (6), a second sliding groove (311) radially opened on the inner rotating frame (31), and a bayonet (41) opened at the inner end of the blade (4); the bayonet (41) penetrates the blade along the axial direction of the volute; one end of the sliding pin (6) is fixedly connected to the spring (5) and slidably connected in the second sliding groove (311); the other end extends to the bottom of the bayonet (41) and abuts against the bottom wall of the bayonet (41); one end of the spring (5) is fixed to the bottom of the second sliding groove (311), and the other end is fixedly connected to the sliding pin (6).

3. A positive displacement fan according to claim 2, characterized in that: The sliding pin (6) is slidably connected to an annular opening (61) at one end in the second sliding groove (311), and the position where the spring (5) is connected to the sliding pin (6) is at the bottom of the opening (61).

4. A positive displacement fan according to claim 2, characterized in that: The diameter of one end of the sliding pin abutting against the bayonet gradually decreases outwards.

5. A positive displacement fan according to claim 2 or 3, characterized in that: The second sliding groove (311) is an annular groove, and the spring is sleeved on a cylindrical fixing block at the center of the annular groove.

6. A positive displacement fan according to claim 1, characterized in that: The air inlet (7) and the air outlet (8) are connected to the volute (1) between the two bearings (2).

7. A positive displacement fan according to claim 1, characterized in that: Each blade (4) is provided with two elastic telescopic components along the axial direction of the volute (1).

8. A positive displacement fan according to claim 1, characterized in that: The first sliding groove (321) and the blade (4) are both provided in four numbers.

9. A positive displacement fan according to claim 1, characterized in that: The bearing (2) is a ball bearing.

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