CN211400266U

CN211400266U - Ejector, cold beam end, cold beam system

Info

Publication number: CN211400266U
Application number: CN201922312525.XU
Authority: CN
Inventors: 黄玉优; 王子平; 谢文利; 李超
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-09-01
Anticipated expiration: 2029-12-20

Abstract

The utility model provides an ejector, cold beam are terminal, cold beam system. The nozzle comprises a nozzle shell, wherein the nozzle shell comprises an airflow introduction section for introducing primary air, a nozzle throat part for throttling and accelerating the introduced primary air, and an airflow output section for ejecting the throttled and accelerated primary air, the nozzle throat part is positioned between the airflow introduction section and the airflow output section, and when the wind pressure of the primary air is changed, the nozzle shell can be elastically deformed to change the flow area of the nozzle throat part. The utility model provides a pair of sprayer, cold beam end, cold beam system, nozzle shell can take place elastic deformation and then change the through flow area of nozzle throat when the wind pressure of a wind changes, simple structure, reliability height, maintenance convenience, with low costs.

Description

Ejector, cold beam end, cold beam system

Technical Field

The utility model belongs to the technical field of air conditioning, concretely relates to sprayer, cold beam end, cold beam system.

Background

The existing active chilled beam utilizes a nozzle to make primary air jet at high speed to induce secondary return air in a room, and the primary air and the secondary air are mixed and then are sent into the room. Under the same refrigeration capacity condition, the larger the induction ratio (secondary air volume: primary air volume, generally about 3:1, namely the injection coefficient) is, the smaller the primary air volume is, but the larger the pressure loss and noise value of the primary air is.

In the variable air volume system, the change of the injection coefficient of an injector in the tail end of a cold beam is large, and the injector often departs from a design value to cause performance reduction and even failure, so that the problems are avoided by frequently adopting a quality control or quantity control mode, wherein the quality control mainly reduces the working pressure of fluid, but the throttling and pressure reduction mode causes energy loss; the quantity adjustment is to change the throat area of the ejector, and has the advantages of wide adjustment range, low energy loss and the like, the ejector pins in various shapes are usually arranged on the central axis of the throat of the ejector, the area of the throat of the ejector is changed by changing the stroke of the ejector pin, and the working state of the ejector is further influenced, and the adjustment mode is widely applied.

The existing mode for driving the ejector thimble (pintle) mainly comprises an electromagnetic driving mode, which is similar to the driving principle of an electronic expansion valve, the corresponding technology of the mode is the most mature and reliable design and is suitable for the use condition with very high precision requirement, but the requirements of the control technology and the detection feedback technology are high, the application cost is higher and is not too large and necessary under the general application occasion, and the design of the cold beam tail end of the ejector with the adjustable throat area, which has the advantages of high reliability, simple structure and convenient maintenance, is very necessary.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model is to provide an injector, cold beam end, cold beam system, nozzle shell can take place elastic deformation and then change the through flow area of nozzle throat when the primary air wind pressure changes, simple structure, reliability height, maintenance convenience, with low costs.

In order to solve the above problem, the utility model provides an ejector, including the nozzle shell body, the nozzle shell body including the air current introduction section that is used for introducing the air current, be used for carrying out throttle acceleration's nozzle throat, be used for the air current output section with throttle acceleration's the spun air current of air current, the nozzle throat is in the air current introduction section with between the air current output section, when the wind pressure of air changes, the nozzle shell body can take place elastic deformation in order to change the through flow area of nozzle throat.

Preferably, the nozzle housing is made of rubber.

Preferably, the nozzle housing includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall, the third side wall, the second side wall and the fourth side wall are opposite to each other, the first side wall, the third side wall, the second side wall and the fourth side wall are sequentially connected end to form the nozzle housing, and a first metal plate and a second metal plate are respectively and correspondingly arranged on inner wall surfaces of the first side wall and the second side wall.

Preferably, the first metal plate is adhered to an inner wall surface of the first side wall; and/or the second metal plate is pasted on the inner wall surface of the second side wall.

Preferably, the first metal plate and the second metal plate are connected by an elastic member for defining a minimum flow area of the nozzle throat.

Preferably, the elastic member includes a spring.

Preferably, the first side wall is of a flat plate structure, the second side wall is of a V-shaped structure, a V-shaped tip of the V-shaped structure and the flat plate structure are opposite to form the nozzle throat, and the structural shapes of the first metal plate and the second metal plate are respectively matched with the structural shapes of the first side wall and the second side wall.

The utility model also provides a cold beam is terminal, including foretell sprayer.

Preferably, the tail end of the cold beam further comprises a tail end shell, a partition plate is arranged in the tail end shell and divides the tail end shell into a static pressure box and an air guide cavity, a through hole is formed in the partition plate, a mounting flange is arranged on one side, facing the air guide cavity, of the through hole, and the nozzle shell is sleeved on the mounting flange.

The utility model also provides a chilled beam system, including foretell chilled beam end.

The utility model provides an injector, chilled beam end, chilled beam system, because the nozzle housing can take place elastic deformation, when the primary air pressure wherein changes, the nozzle housing will take place elastic deformation under the effect of primary air pressure, thereby the through-flow area of nozzle throat can with the change of the size matching of primary air pressure, and can understand that, the minimum value of primary air pressure should be to the minimum through-flow area of nozzle throat, and along with the gradual increase of primary air pressure, the through-flow area of nozzle throat increases by the aforesaid minimum through-flow area gradually, when primary air pressure reaches the biggest, the through-flow area of nozzle throat reaches the biggest, and the same reason, when the primary air pressure changes by the biggest to the minimum, the through-flow area of nozzle throat resumes to the minimum by the biggest gradually, therefore, the self-adaptive adjustment of the flow area of the throat part of the nozzle and the primary air pressure is realized, and the self-adaptive nozzle is simple in structure, high in reliability, convenient to maintain and low in cost.

Drawings

Fig. 1 is a schematic cross-sectional view of an ejector according to an embodiment of the present invention;

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a schematic view of the internal structure of the cold beam end according to another embodiment of the present invention.

The reference numerals are represented as:

1. a nozzle housing; 11. a gas stream introduction section; 12. a nozzle throat; 13. an airflow output section; 14. a first side wall; 15. a second side wall; 16. a third side wall; 17. a fourth side wall; 21. a first metal plate; 22. a second metal plate; 3. an elastic member; 100. a tip housing; 101. a partition plate; 102. a static pressure box; 103. a wind-guiding cavity; 104. and (7) mounting a flange.

Detailed Description

With reference to fig. 1 to 4, according to an embodiment of the present invention, an ejector is provided, for use in a cold beam end, including a nozzle housing 1, the nozzle housing 1 includes an airflow introduction section 11 for introducing primary air, a nozzle throat 12 for throttling and accelerating the introduced primary air, and an airflow output section 13 for ejecting the throttled and accelerated primary air, the nozzle throat 12 is located between the airflow introduction section 11 and the airflow output section 13, and when a wind pressure of the primary air changes, the nozzle housing 1 can elastically deform to change a flow area of the nozzle throat 12. In this technical solution, since the nozzle housing 1 can be elastically deformed, when the pressure of the primary air changes, the nozzle housing 1 will be elastically deformed under the action of the pressure of the primary air, so that the flow area of the nozzle throat 12 can be changed in a manner matching with the pressure of the primary air, and it can be understood that the minimum value of the pressure of the primary air should be corresponding to the minimum flow area of the nozzle throat 12, and as the pressure of the primary air gradually increases, the flow area of the nozzle throat 12 gradually increases from the minimum flow area, when the pressure of the primary air reaches the maximum, the flow area of the nozzle throat 12 reaches the maximum, and likewise, when the pressure of the primary air changes from the maximum to the minimum, the flow area of the nozzle throat 12 gradually returns from the maximum to the minimum, thereby realizing the adaptive adjustment of the flow area of the nozzle throat 12 and the pressure of the primary air, simple structure, high reliability, convenient maintenance and low cost.

The material of the nozzle housing 1 is preferably a material with certain shaping capability and elasticity, such as one of rubber and soft plastic, and the rigidity of the rubber and the soft plastic, that is, the shaping capability, should be determined by a test or simulation mode according to the adjustment requirement range of the primary air pressure.

As a specific example of the nozzle housing 1, preferably, the nozzle housing 1 includes a first side wall 14 and a second side wall 15 which are oppositely arranged, and a third side wall 16 and a fourth side wall 17 which are oppositely arranged, the first side wall 14, the third side wall 16, the second side wall 15 and the fourth side wall 17 are sequentially connected end to form the nozzle shell 1, the inner wall surfaces of the first side wall 14 and the second side wall 15 are respectively provided with a first metal plate 21 and a second metal plate 22, it should be understood that the first side wall 14, the second side wall 15, the third side wall 16, and the fourth side wall 17 may be assembled and spliced to form the nozzle housing 1 after being separately processed, or the nozzle housing 1 may be formed by injection molding or other integral molding methods, but is preferably formed in an integrated manner to reduce the number of corresponding manufacturing processes and to improve the sealability of the nozzle housing 1 and to make the size more easily controllable. The first metal plate 21 and the second metal plate 22 are arranged to improve the rigidity of the first side wall 14 and the second side wall 15, so as to prevent the first side wall 14 and the second side wall 15 from deforming under the action of wind pressure, and improve the deformation of the third side wall 16 and the fourth side wall 17, thereby facilitating the determination of the related parameters of the primary wind pressure and the flow area of the nozzle throat 12, and facilitating the design work of the ejector. Preferably, the first metal plate 21 is adhered to an inner wall surface of the first side wall 14; and/or, the second metal plate 22 is adhered to the inner wall surface of the second side wall 15, so that damage caused by the structure of the nozzle housing 1, such as bolting, between the first metal plate 21 and the second metal plate 22 and the first side wall 14 or the second side wall 15, respectively, can be prevented, which significantly facilitates uniformity of elastic deformation of the nozzle housing 1 during pressure increase or decrease caused by wind pressure, and does not adversely affect the direction of elastic deformation, such as by providing corresponding connecting holes in the first side wall 14 or the second side wall 15 for bolting.

Further, the first metal plate 21 and the second metal plate 22 are connected by an elastic member 3, such as a spring, the elastic member 3 is used for limiting the minimum flow area of the nozzle throat 12, when the corresponding first metal plate 21 and second metal plate 22 are not arranged in the injector, the elastic member 3 is arranged between the first side wall 14 and the second side wall 15, and the stiffness of the spring can be selected according to the test result.

In terms of the structural form, as shown in fig. 1, preferably, the first side wall 14 is a flat plate structure, the second side wall 15 is a V-shaped structure, a V-shaped tip of the V-shaped structure and the flat plate structure are opposite to form the nozzle throat 12, the structural shapes of the first metal plate 21 and the second metal plate 22 are respectively matched with the structural shapes of the first side wall 14 and the second side wall 15, and the projection of the third side wall 16 and the projection of the fourth side wall 17 in the direction of the air flow jet is arc-shaped. The first side wall 14 and the external mounting member are preferably fixed by using a structural form of the first side wall 14 in a flat plate structure and the second side wall 15 in a V-shaped structure, and at this time, the elastic deformation of the nozzle housing 1 completely depends on the remaining second side wall 15, third side wall 16 and fourth side wall 17, especially the adjustment of the distance between the second side wall 15 and the first side wall 14, so that the selection of the material of the nozzle housing 1 and the rigidity of the elastic member are more convenient. It will be appreciated that the tip of the V-shaped structure is rounded to avoid excessive wind resistance of the primary air flowing through the nozzle throat 12, and that the ejector may be referred to as a slotted ejector.

The working principle of the self-adaptive adjustment of the flow area of the nozzle throat 12 by the slot-type ejector is as follows:

in the initial stage, when the primary air volume is not more than the minimum primary air volume, the spring is in a static non-deformation state, and the flow area of the throat part 12 of the strip-slit type nozzle is the minimum; when the primary air volume is larger than the minimum primary air volume, the air pressure in the static pressure box 102 is gradually increased, the reverse thrust generated on the side surfaces of the ejector (namely the first side wall 14, the second side wall 15, the third side wall 16 and the fourth side wall 17) is gradually increased, the spring deformation is also gradually increased, the generated spring force and the reverse thrust are balanced with each other, the two metal plates (the first metal plate 21 and the second metal plate 22) are gradually separated from each other, the flow area of the throat part of the slit-type nozzle is increased to adapt to the increase of the primary air injection flow, and the nozzle is still at a certain position until the nozzle is in a balanced state, so that the primary air volume and the air pressure in the static pressure box 102 are in a stable state; the arc-shaped deformation ends on the two side edges of the ejector are also automatically adapted to the shape change of the strip seam type nozzle, but have enough strength to ensure the integrity of the flow channel of the ejector; the metal plate has enough strength and rigidity, so that the shape of the injection runner in the injector is approximately unchanged, and the change of the cross section area of the throat part mainly has decisive influence on the injection performance; when the primary air volume reaches the maximum, the spray area of the throat part of the nozzle is the maximum, and the tensile force of the spring is the maximum.

When the primary air volume gradually decreases from the maximum, the process is opposite to the process of increasing the primary air volume, and the detailed description is omitted here. Regardless of the increase or decrease of the air volume, when the primary air volume is stable and unchanged, the cross-sectional area of the throat part of the strip slit type nozzle always has a fixed corresponding value, thereby ensuring that the injection coefficient is in a better range.

According to the utility model discloses an embodiment still provides a cold beam end, including foretell sprayer, the sprayer has a plurality ofly, a plurality of the sprayer interval is arranged in a row. Specifically, the tail end of the cold beam further comprises a tail end shell 100, a partition plate 101 is arranged in the tail end shell 100, the tail end shell 100 is divided into a static pressure box 102 and an induced draft cavity 103 by the partition plate 101, a through hole is formed in the partition plate 101, a mounting flange 104 is arranged on one side, facing the induced draft cavity 103, of the through hole, and the nozzle shell 1 is sleeved on the mounting flange 104.

The working principle of the chilled beam end is briefly described below with reference to fig. 4: the primary air enters the static pressure box 102 through the air pipe connector, flows from the inlet C of the ejector to the outlet B of the ejector and is ejected at high speed, and a negative pressure area D is generated around the outer surface of the air flow introduction section 11 and the throat part 12 of the nozzle under the Venturi effect. Indoor return air (secondary air) passes through the filter and the heat exchanger from the return air inlet E under atmospheric pressure and is sucked into the negative pressure area D, the indoor return air is subjected to heat exchange (cooled or heated or does not generate heat exchange) on the heat exchanger, and the primary air and the secondary air are mixed and then are guided to the indoor through the guide plate from the air outlet A.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. An ejector, characterized by, including nozzle housing (1), nozzle housing (1) includes air current introduction section (11) that is used for introducing the primary air, is used for carrying out throttle acceleration's nozzle throat (12) to the primary air that introduces, is used for the air current output section (13) of spouting out the primary air that will throttle acceleration, nozzle throat (12) are in air current introduction section (11) with between air current output section (13), when the wind pressure of primary air changes, nozzle housing (1) can take place elastic deformation in order to change the through flow area of nozzle throat (12).

2. The injector as claimed in claim 1, characterized in that the nozzle housing (1) is made of rubber.

3. The injector according to claim 1 or 2, wherein the nozzle housing (1) comprises a first side wall (14), a second side wall (15) and a third side wall (16), a fourth side wall (17) which are oppositely arranged, the first side wall (14), the third side wall (16), the second side wall (15), and the fourth side wall (17) are sequentially connected end to form the nozzle housing (1), and a first metal plate (21) and a second metal plate (22) are respectively and correspondingly arranged on the inner wall surfaces of the first side wall (14) and the second side wall (15).

4. The ejector according to claim 3, wherein the first metal plate (21) is stuck to an inner wall surface of the first side wall (14); and/or the second metal plate (22) is adhered to the inner wall surface of the second side wall (15).

5. The injector according to claim 3, characterized in that the first metal plate (21) and the second metal plate (22) are connected by a resilient member (3), the resilient member (3) being adapted to define a minimum flow area of the nozzle throat (12).

6. The injector according to claim 5, characterized in that the elastic member (3) comprises a spring.

7. An injector according to claim 3, characterized in that the first side wall (14) is of a flat plate construction and the second side wall (15) is of a V-shaped construction, the V-shaped tip of the V-shaped construction forming the nozzle throat (12) opposite the flat plate construction, the first metal plate (21) and the second metal plate (22) having a structural shape matching the structural shape of the first side wall (14) and the second side wall (15), respectively.

8. A chilled beam end comprising an ejector, wherein the ejector is the ejector of any one of claims 1 to 7.

9. The chilled beam end according to claim 8, further comprising an end housing (100), wherein a partition (101) is arranged in the end housing (100), the partition (101) divides the end housing (100) into a static pressure tank (102) and an induced draft cavity (103), the partition (101) is provided with a through hole, one side of the through hole facing the induced draft cavity (103) is provided with a mounting flange (104), and the nozzle housing (1) is sleeved on the mounting flange (104).

10. A chilled beam system comprising a chilled beam end, wherein the chilled beam end is the chilled beam end of claim 8 or 9.