Slide valve for compressor and screw compressor with slide valve

Some embodiments of the present disclosure provide a slide valve for a compressor and a screw compressor with the slide valve. The slide valve for the compressor includes a slide valve main body (10), the slide valve main body (10) is provided with a gas replenishing chamber (11) therein, a surface, facing to a compression chamber of the compressor, of the slide valve main body (10) is provided with a gas replenishing outlet hole (12), and the gas replenishing outlet hole (12) is in communication with the gas replenishing chamber (11).

RELATED APPLICATIONS

The present disclosure is a national phase entry under 35 U.S.C. § 371 of International Patent Application No. PCT/CN2018/079462, filed Mar. 19, 2018, entitled “Slide Valve for Compressor and Screw Compressor Having Same,” which claims priority to Chinese Patent Application No. 201710166152.2, filed on Mar. 20, 2017, and entitled “Slide Valve for Compressor and Screw Compressor Having Same,” both of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

Some embodiments of the present disclosure relate to a field of air conditioning devices, and in particular to a slide valve for a compressor and a screw compressor with the slide valve.

BACKGROUND

A great refrigerating capacity may be required in some situations in a market, however a size of a former refrigerating unit may not be changed. In order to meet the market demand, an economizer needs to be added to the refrigerating unit, to mix high-pressure gases and lead mixed gas to a compression chamber of a compressor after achieving a required pressure. In this way, an objective of increasing the refrigerating capacity may be achieved.

For a related screw compressor, most of the screw compressors may take an axial gas replenishing mode, and an axial gas replenishing process is as follows: a gas channel is processed on a compressor body; when a gas replenishing structure switches on to replenish the gas, air may enter into a gas replenishing hole which is reserved on the compressor body through a gas replenishing port disposed on an outer surface of the compressor body; then the gas may enter into a gas replenishing hole of an exhaust bearing base of the compressor and enter into a rotor compression chamber subsequently after rotation, to complete the gas replenishing process. A diameter ϕ of the gas replenishing hole in the conventional art is 20 mm. There are problems that the air may have great pulsation in a gas replenishing channel, a great extra exciting force may be generated, and noise of the compressor may be increased.

SUMMARY

Some embodiments of the present disclosure provide a slide valve for a compressor capable of reducing noise and a screw compressor with the slide valve.

An embodiment of the present disclosure provides a slide valve for a compressor, including a slide valve main body, a gas replenishing chamber and a gas replenishing outlet hole, wherein the gas replenishing chamber is disposed in the slide valve main body, the gas replenishing outlet hole is provided on a surface, facing to a compression chamber of the compressor, of the slide valve main body, and the gas replenishing outlet hole is in communication with the gas replenishing chamber.

In an exemplary embodiment, the slide valve main body includes a top central line, two sides of the top central line is provided with at least one group of gas replenishing outlet hole group respectively, and the at least one group of gas replenishing outlet hole group includes at least one gas replenishing outlet hole.

In an exemplary embodiment, along an extension direction of the top central line, an end of the slide valve main body is provided with an opening which is in communication with the gas replenishing chamber, the slide valve for the compressor further includes a sealing and pressing plate, the sealing and pressing plate is fixedly provided on the slide valve main body, and seals the opening.

In an exemplary embodiment, the slide valve includes a gas replenishing inlet hole provided on a side of the slide valve main body, wherein the gas replenishing inlet hole is in communication with the gas replenishing chamber.

In an exemplary embodiment, the gas replenishing chamber includes a round cross section, and a diameter of the gas replenishing chamber is 45 mm-55 mm.

In an exemplary embodiment, the gas replenishing outlet hole includes a round cross section, and a diameter of the gas replenishing outlet hole is 4 mm-6 mm.

Some embodiments of the present disclosure provide a screw compressor, including a compressor body, a screw disposed in a rotor chamber of the compressor body and a slide valve disposed inside the compressor body. The slide valve is the abovementioned slide valve for the compressor, and a side, provided with a gas replenishing outlet hole, of the slide valve faces to the rotor chamber of the compressor body.

In an exemplary embodiment, there are two screws meshed with each other, and a top central line of the slide valve corresponds to a connecting line of points of intersection of inner circles of the two screws.

In an exemplary embodiment, the screw compressor further includes a gas replenishing pipe, the gas replenishing pipe passes through the compressor body, and is coupled to the slide valve and in communication with the gas replenishing chamber of the slide valve.

In accordance with the slide valve for the compressor and the screw compressor with the same in some embodiments of the present disclosure, the slide valve main body is provided with the gas replenishing chamber therein, the surface, facing to the compression chamber, of the slide valve main body is provided with the gas replenishing outlet hole, to buffer the air. In this way, when the compressor replenishes the gas, gas pulsation may be effectively reduced. Accordingly, vibration and noise of the compressor may be reduced.

EXPLANATION OF REFERENCE NUMBERS

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be described in detail below by using drawings for reference and in combination with the embodiments.

As shown inFIG. 1,FIG. 2andFIG. 3, according to an embodiment of the present disclosure, a slide valve for a compressor includes a slide valve main body10. The slide valve main body10is provided with a gas replenishing chamber11therein. A surface, facing to a compression chamber of the compressor, of the slide valve main body10is provided with a gas replenishing outlet hole12, and the gas replenishing outlet hole12is in communication with the gas replenishing chamber11. The slide valve main body10is provided with the gas replenishing chamber11therein, by which air is buffered to some extent, and gas pulsation is reduced. Accordingly, noise of the compressor caused due to air impact during replenishing gas is reduced, the noise when the compressor works is reduced, and comfort is improved during using.

By referring toFIG. 1,FIG. 2andFIG. 3, the slide valve main body10includes a top central line13. When the slide valve main body10is installed on a dual-screw compressor, points on the top central line13correspond to points of intersection of inner circles of two screws31one to one. A side, facing to the compression chamber, of the slide valve main body10is a curve surface including an arc surface on two sides of the top central line13.

In an exemplary embodiment, two sides of the top central line13are provided with at least one group of gas replenishing outlet hole group (each arc surface is provided with at least one group of gas replenishing outlet hole group), respectively. The at least one group of gas replenishing outlet hole group includes at least one gas replenishing outlet hole12. Two sides of the top central line13are provided with the at least one group of gas replenishing outlet hole group, thereby ensuring an enough gas replenishing quantity. A specific quantity of the gas replenishing outlet hole groups is determined in accordance with the need, for example, more gas replenishing outlet hole groups may be configured when the required gas replenishing quantity is great. A quantity of the gas replenishing outlet holes12inside each gas replenishing outlet hole group may be determined in accordance with the required gas replenishing quantity as well. For example, eleven gas replenishing outlet holes12is disposed on the slide valve main body10.

A plurality of gas replenishing outlet holes12in one gas replenishing outlet hole group is provided along a helix line of the screw of the screw compressor, as to ensure that each of the plurality of gas replenishing outlet holes12corresponds to a groove between two teeth of the screw31. Accordingly, a gas replenishing effect is ensured.

The gas replenishing outlet hole12may be the hole disposed on the slide valve main body10, or the slide valve main body10may be fixedly connected with an air duct thereon, and a gas outlet of the air duct may be taken as the gas replenishing outlet hole12.

As shown inFIG. 1, the gas replenishing chamber11has a round cross section, a range of a diameter of the gas replenishing chamber11is 45 mm-55 mm. In an exemplary embodiment, the diameter of the gas replenishing chamber11is 49 mm. In this way, the gas replenishing quantity is ensured, and an effect of buffering and reducing noise is ensured. Furthermore, a structural strength of the slide valve main body10is ensured. Of course, the diameter of the gas replenishing chamber11may be 45 mm, 48 mm, 50 mm, 52 mm, 55 mm and so on.

The gas replenishing outlet hole12has a round cross section, and a diameter of the gas replenishing outlet hole12is 4 mm-16 mm. In an exemplary embodiment, the diameter of the gas replenishing outlet hole12is 5 mm.

In the embodiment, along an extension direction of the top central line13, an end of the slide valve main body10is provided with an opening which is in communication with the gas replenishing chamber11. In this way, the gas replenishing chamber11is processed inside the slide valve main body10easily, a production cost is reduced. The slide valve for the compressor may further include a sealing and pressing plate14. The sealing and pressing plate14is fixedly coupled to the slide valve main body10, and seals the opening. By the configured sealing and pressing plate14, air tightness of the gas replenishing chamber11is ensured, and air leakage is prevented. Accordingly, the gas replenishing effect is ensured. The sealing and pressing plate14may be fixedly connected to the slide valve main body10by fixation with a bolt, welding, riveting and other methods.

In an exemplary embodiment, the side of the slide valve main body10is provided with a gas replenishing inlet hole15which is in communication with the gas replenishing chamber11. By the gas replenishing inlet hole15, gas is led into the gas replenishing chamber11of the slide valve main body10, so as to replenish for the compressor.

According to some embodiments of the present disclosure, a screw compressor is provided, including a compressor body30, a screw31disposed in a rotor chamber of the compressor body30and a slide valve disposed inside the compressor body30. The slide valve is the abovementioned slide valve for the compressor. A side, provided with a gas replenishing outlet hole12, of the slide valve faces to the rotor chamber of the compressor body30. The screw compressor is provided with the slide valve therein, in this way gas pulsation may be reduced when the compressor replenishes gas. Accordingly, noise caused due to replenishment of the gas may be reduced.

In an exemplary embodiment, there are two screws31meshed with each other. A top central line13of the slide valve corresponds to a connecting line of points of intersection of inner circles of the two screws31. In this way, a gas replenishing effect of the gas replenishing outlet hole12on the slide valve main body10may be ensured.

In at least one embodiment, the screw compressor may further include a gas replenishing pipe32. The gas replenishing pipe32passes through the compressor body30, and is connected to the slide valve and in communication with the gas replenishing chamber11of the slide valve. By the gas replenishing pipe32, the gas may be led into a gas replenishing chamber11of the slide valve main body10.

When the slide valve is assembled with the compressor body30, a gas replenishing inlet hole15of the slide valve is in communication with a gas replenishing port of the compressor body30. There are eleven small holes, the diameter is Φ5 mm.

As shown inFIG. 3, one gas replenishing chamber11is disposed inside the slide valve main body10. In an exemplary embodiment, the gas replenishing chamber11is a hollow chamber with a diameter ϕ of 49 mm and a length of 65 mm. An arc surface on which the slide valve main body10is in contact with a rotor (the screw31) is provided with the gas replenishing outlet holes12. There are eleven gas replenishing outlet holes12, with diameters ϕ of 5 mm. A calculated gas replenishing area is equivalent to one gas replenishing hole with a diameter ϕ of 16.58 mm. When it is opened for replenishing the gas, the gas may enter into the gas replenishing chamber11by the gas replenishing port and the gas replenishing pipe32on the compressor body30, and there is a buffering in the gas replenishing chamber11. Then the gas may enter into a rotor compression chamber by the gas replenishing outlet hole12on the arc surface, as to complete a gas replenishing process. In addition, with the adoption of the gas replenishing outlet hole12having the small diameter, it is conducive to reducing gas pulsation, as to accordingly reduce noise caused during replenishing the gas. Furthermore, because the diameter ϕ of the gas replenishing outlet hole12is 5 mm, when a rotor (the screw31) tooth passes the gas replenishing outlet hole12, leakage of the gas on two sides of the tooth is improved well, with the better gas replenishing effect.

The slide valve for the compressor and the screw compressor with the slide valve according to some embodiments of the present disclosure has the following technical effects.

The gas replenishing chamber is processed inside the slide valve main body, a bottom is sealed with the sealing and pressing plate. When the compressor switches on to replenish gas, the gas may have certain buffering effect in the gas replenishing chamber and reduce the gas pulsation. Then the gas may enter into the rotor (screw) compression chamber by the gas replenishing outlet hole of the arc surface of the slide valve main body, in this way the gas replenishing process may be completed. With the adoption of the slide valve, the gas pulsation caused by replenishment of the gas may be reduced, and it is conducive to reduce the noise of the compressor during replenishing the gas; furthermore, the problem that the gas is leaked when a top of the rotor (screw) tooth of the compressor passes the gas replenishing outlet hole may be improved as well.

The above is only an exemplary embodiment of the present disclosure and not intended to limit the scope of protection of the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modifications, equivalent replacements, improvements and the like made within the spirit and principle of the present disclosure shall fall within the scope of protection of the present disclosure.