WO2017045408A1

WO2017045408A1 - Refrigerating unit and throttling device thereof

Info

Publication number: WO2017045408A1
Application number: PCT/CN2016/081851
Authority: WO
Inventors: 钟瑞兴; 张治平; 刘华; 李宏波; 蒋楠; 陈玉辉; 刘建飞; 谢蓉; 蒋彩云
Original assignee: 珠海格力电器股份有限公司
Priority date: 2015-09-15
Filing date: 2016-05-12
Publication date: 2017-03-23
Also published as: CN105042954A; CN105042954B

Abstract

A throttling device comprises a front-end throttling section (21) and a back-end pipeline connection section (22). A throttling orifice is provided in the front-end throttling section (21), and an outer lateral wall of the throttling orifice is a conical structure with a smaller front end and a larger rear end. The back-end pipeline connection section (22) has a connection portion for fitting with a front pipeline and a back pipeline. Also provided is a refrigerating unit using the throttling device. The device has a refrigerating throttling effect and an anti-blocking function.

Description

Refrigeration unit and its throttle device

This application claims priority to Chinese Patent Application No. 201510585216.3, entitled "A Refrigeration Unit and Its Throttling Device", filed on September 15, 2015, the entire contents of which are incorporated herein by reference. In the application.

Technical field

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration unit and a throttle device thereof.

Background technique

In refrigeration units, throttling devices are an essential mechanism. At present, the commonly used throttling devices include a capillary tube, an orifice plate, an electronic expansion valve, a thermal expansion valve, etc. Among them, the orifice plate has a simple structure and is widely used because it has no mechanical moving parts.

However, in the process of use, if the device has a small flow rate, the orifice is small, especially in a large refrigeration unit, such as motor cooling, lubricating oil cooling, etc., the cooling demand is small, so the flow required to throttle is also Very small, the natural orifice is also very small, the structure can be seen as shown in Figure 1.

However, due to the large volume of the large refrigeration unit, the cleanliness of the system may not be completely free of slag. If these slags flow into the orifice with the refrigerant, it is likely to cause blockage of the orifice and cause the throttle to fail. The cooling and cooling process does not work properly.

At present, there is also a filter in front of the pipeline to prevent the entry of slag, but it undoubtedly increases the material, and at the same time, because the filter is added to the pipeline system, the welding leak point is increased in the middle.

Summary of the invention

In view of this, the present invention provides a throttling device, the structure of which can prevent the occurrence of clogging of the orifice, simplify the pipeline configuration, and reduce the leakage point of the pipeline.

The present invention also provides a refrigeration unit to which the above-described throttle device is applied.

To achieve the above object, the present invention provides the following technical solutions:

A throttling device includes a front end throttle section and a rear end pipeline connection section; the front end throttle section is provided with an orifice, and the outer side wall is a front small and large conical structure; the rear end pipeline The connecting section has a connection for mating with the front and rear lines.

Preferably, the orifice is disposed along a central axis of the front end throttle section.

Preferably, the inclination angle α of the outer sidewall is 20° to 40°.

Preferably, the inner diameter of the orifice is taken as d1, and the outer diameter of the orifice is d2=d1+ (1 to 2) mm.

Preferably, the axial length L2 of the outer sidewall is not less than 2d1.

Preferably, the orifice has a length L1 of 2 to 5 mm.

Preferably, the outer side wall is provided with a thread groove.

Preferably, the thread feature M of the thread groove has a size of 0.3 to 0.8 times the inner diameter of the orifice.

Preferably, the thread groove is characterized by a thread M2.

Preferably, the front end throttle section and the rear end pipeline connection section are a unitary structure.

A refrigeration unit includes a first connecting pipe, a throttle device and a second connecting pipe which are sequentially connected, and the throttling device is the above-described throttling device.

It can be seen from the above technical solution that the throttling device provided by the present invention has an outer side wall of the front end throttle section which is a small front and a large tapered structure. When there is a slag which is larger than the orifice, the edge is along. The inclined wall flows to the rear to serve the function of storing the slag, so as to be away from the orifice, and does not interfere with the throttling of the liquid refrigerant of the main body; the liquid refrigerant entering the rear of the inclined wall can also enter the orifice along the surface of the inclined wall. The solution can effectively solve the clogging condition of the small orifice plate and ensure the throttling effect; and compared with the method of installing the filter net, the pipeline is simple, easy to process and connect, reduce the pipeline welding leakage point, and improve the pipeline system sealing. Reliability.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural view of a orifice plate in the prior art;

2 is a schematic structural diagram of a throttling device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a connecting pipe assembly of a throttle device according to an embodiment of the present invention.

Wherein, 1 is a first connecting pipe; 2 is a throttling device, 21 is a front end throttle section, 22 is a rear end pipe connecting section; and 3 is a second connecting pipe.

detailed description

The invention discloses a refrigeration unit and a throttle device thereof, the structure of which can prevent the occurrence of blockage of the throttle hole, simplify the pipeline configuration and reduce the welding leakage point of the pipeline.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

2 and FIG. 3, FIG. 2 is a schematic structural diagram of a throttling device according to an embodiment of the present invention; and FIG. 3 is a schematic structural diagram of a throttling device connecting pipe assembly according to an embodiment of the present invention.

The throttling device provided by the embodiment of the present invention is used for connecting between the front and rear pipelines, and the core improvement thereof comprises: a front end throttle section 21 and a rear end pipeline connection section 22; wherein the front end throttle section 21 is opened The orifice has an outer side wall which is a small front and a large tapered structure; the rear end pipe connecting section 22 has a connecting portion for cooperating with the front and rear pipes. It can be understood that the front and rear directions here are determined according to the flow direction of the liquid refrigerant, the same below.

It can be seen from the above technical solution that the throttling device provided by the embodiment of the present invention has an outer side wall of the front end throttle section 21 which is a small front and a large tapered structure, and when there is a large slag flowing through the orifice And flowing along the inclined wall (ie, the outer side wall described above) to the rear (here specifically between the outer side wall of the front end throttle section 21 and the inner wall of the first connecting pipe 1, as shown in FIG. 3), for storage The effect of the slag is to keep it away from the orifice and does not interfere with the throttling of the liquid refrigerant of the main body; the liquid refrigerant entering the rear of the inclined wall can also enter the orifice along the surface of the inclined wall. The solution can effectively solve the clogging condition of the small orifice plate and ensure the throttling effect; and compared with the method of installing the filter net, the pipeline is simple, easy to process and connect, reduce the pipeline welding leakage point, and improve the pipeline system sealing. Reliability.

Preferably, the orifice is disposed along the central axis of the front end section 21, and the tapered outer side wall is symmetric along the center axis to facilitate smooth flow of the liquid refrigerant in the orifice.

As in the front section throttle section 21 as described above, the inclined wall surface outside the orifice is inclined from the inlet to the outlet, and the inclination angle thereof is an angle α as shown in FIG. If the inclination angle α is too large, it is not conducive to the slag flowing backward along the inclined wall; if it is too small, it is not conducive to the turbulent movement of the fluid at the back end, and the impact of the fluid on the slag is reduced, and the above two effects are combined. In the specific embodiment provided by the present solution, the inclination angle α of the outer side wall is 20 to 40 degrees.

Further, the inlet outer diameter d2 of the outer inclined wall surface of the orifice should be sufficient under the premise of satisfying the strength. It can be small, which is more conducive to reducing the contact area of the slag at the inlet of the orifice, so that the slag flows away from the orifice at the slight impact of the fluid. In order to ensure its strength, d2=d1+(1~2)mm is generally taken, where d1 is the inner diameter of the orifice.

At the same time, in order to ensure a certain space for storing slag on the inclined wall, the axial length L2 of the outer side wall is not less than 2d1, and the structure thereof can be referred to FIG.

As described above, the throttle section 21 has a throttling function, and the orifice size d1 is determined according to the pressure difference after the throttle section and the required cooling capacity. The shorter the orifice length L1, the better. Minimize the flash gas generated by the liquid refrigerant passing through the orifice to ensure that there is sufficient low-pressure liquid refrigerant to evaporate after throttling to meet the cooling demand. Then, in view of the thickness and strength of the orifice wall, the orifice cannot be infinitely short, generally 2 to 5 mm.

Of course, the above is only based on the preferred size given by the existing device, and those skilled in the art can make corresponding adjustments according to the actual needs according to the above ideas, and details are not described herein again.

Further, the slanting wall surface as described above is processed with a thread feature M, and the thread may be left-handed or right-handed, depending on the convenience of the processing process, so that the thread structure is adopted, so that The fluid flow moves spirally along the surface of the thread. When the slag is located at the orifice position, the slag that is blocked in the orifice is flushed by the spiral motion of the fluid, and then the slag is stored along the slope at the rear side. The larger the thread, the stronger the turbulence effect of the fluid flowing along the thread groove, and vice versa. However, if the thread is too large, the thickness of the inclined wall becomes thin and the strength is lowered. Therefore, the principle of selecting the thread feature M can be selected according to the size of the orifice (0.3-0.8), so as not to affect the slope strength, the principle of taking the large value is as large as possible, and the size of the orifice is generally 3 mm. In terms of the thread, the M2 has a better effect and can satisfy the turbulent effect of the fluid flow.

Preferably, the front end throttle section 21 and the rear end pipeline connection section 22 are of a unitary structure, which is easy to process and connect, and improves the reliability of the piping system seal.

In the specific embodiment provided by the present solution, the two ends of the rear end pipe connecting section 22 are provided with a connecting port (ie, the above connecting portion), and the diameter D of the port section is the same as the inner diameter of the matching pipe, and the outer diameter is The outer diameter of the tubing is the same for easy connection and soldering operations. The inner diameter d3 is based on the principle of ensuring the strength of the orifice plate, and is generally 0.5D.

The embodiment of the present invention further provides a refrigeration unit including a first connecting pipe 1 and a second connecting pipe 3 which are sequentially connected. The core improvement is that the throttling device is the throttling device 2 described above. The structure can be referred to FIG. 3, in which case the front end throttle section 21 is fitted in the first connecting pipe 1. The outer diameter of the foremost end of the front end throttle section 21 should be smaller than the inner diameter of the first connecting pipe 1; the maximum outer diameter of the front end throttle section 21 is not larger than the inner diameter of the first connecting pipe 1.

The connection of the throttling device 2 to the pipeline is shown in Fig. 3. It is apparent that the connection structure is the same as the connection of the prior art orifice plate, i.e., no leakage points are added. After the two sections are connected, when the fluid flows through the throttling device of the present scheme, the fluid flow effect as shown in FIG. 3 is produced. Thus, when there is a slag that is larger than the orifice, the turbulent fluid flowing along the inclined wall will have an impact force on the slag, and the slag will be washed away, thereby achieving the function of preventing the blockage.

With this scheme technology, there is no change in the external structure, and the internal processing direction and the threading feature of the hole only need to be changed, and the structure is simple and easy to implement.

In summary, the embodiment of the invention provides a throttling device, which has the functions of cooling throttling and self-blocking. The throttle device includes a front end throttle section and a rear end pipeline connection section; wherein the front end throttle section functions as a main throttle and anti-blocking function, and includes a throttle orifice, the throttle hole is an inclined wall surface, and the inclined Threaded groove on the wall; the rear pipe connection section, which consists of two steps, mainly for pipe connection. The scheme utilizes the spiral flow of fluid inside the pipeline to flush and block the slag, and functions as a self-blocking function, and has a simple structure, safety and reliability. Embodiments of the present invention also provide a refrigeration unit to which the above-described throttle device is applied.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

A throttling device is characterized in that it comprises a front end throttle section (21) and a rear end pipeline connection section (22); the front end throttle section (21) is provided with an orifice, and the outer side wall is small front A rear large conical structure; the rear end pipe connection section (22) has a connection for mating with the front and rear pipes.
The throttling device according to claim 1, characterized in that the orifice is arranged along a central axis of the front end throttle section (21).
The throttling device according to claim 2, wherein the inclination angle α of the outer side wall is 20 to 40 degrees.
The throttle device according to claim 3, wherein an inner diameter of the orifice is d1, and an outer diameter d2 of the orifice is d1 + (1 to 2) mm.
The throttling device according to claim 4, wherein the outer side wall has an axial length L2 of not less than 2d1.
The throttle device according to claim 5, wherein the orifice has a length L1 of 2 to 5 mm.
The throttle device according to any one of claims 1 to 6, wherein the outer side wall is provided with a thread groove.
The throttle device according to claim 7, wherein the threaded feature M of the thread groove has a size of 0.3 to 0.8 times the inner diameter of the orifice.
The throttling device of claim 8 wherein said threaded groove has a thread characteristic M2.
The throttling device according to claim 1, characterized in that the front end throttle section (21) and the rear end pipe connection section (22) are of unitary construction.
A refrigeration unit comprising a first connecting pipe (1), a throttling device and a second connecting pipe (3) connected in series, wherein the throttling device is according to any one of claims 1-10 Throttle device (2).