Double-economizer port structure of screw compressor

Abstract

The utility model relates to a double economizer mouth structure of screw compressor, including compressor body and the exhaust casing of setting in the lateral side of compressor body, the first air supplement passage and the second air supplement passage are provided with respectively on the exhaust casing upper and lower portion, the utility model discloses reasonable in structure, clever in design can make the air supplement flow dispersion, reduce the air supplement flow rate of single economizer mouth, reduce the gas -liquid mixing phenomenon that generates because high -speed flow, through setting double air supplement passage in the same compression stage to improve the refrigeration performance and energy efficiency ratio of compressor significantly to satisfy the higher demand of refrigerating capacity and energy -conservation under different working conditions.

Description

Technical Field

[0001] This utility model relates to a dual economizer port structure for a screw compressor. Background Technology

[0002] In screw compressor refrigeration systems, the screw compressor is one of the core components, and its performance directly affects the efficiency and stability of the refrigeration system. As an important device for improving the performance of screw compressors, the economizer can effectively improve the refrigeration capacity and energy efficiency ratio of the compressor by injecting intermediate gas into the refrigerant. Under low temperature or high load conditions, the gas injection effect of the economizer is particularly obvious, which can make up for the problem of insufficient refrigeration capacity of single-stage compression at low temperature. Traditional open single-stage screw compressors only have a single economizer port, which injects intermediate pressure gas into the compression chamber to improve energy and efficiency. However, under low temperature or high compression ratio conditions, the single economizer port has the following problems: (1) Due to the limitation of the screw compressor space structure, the amount of gas injected by the single economizer port is limited. Especially for refrigerants such as R507A, which are large molecule refrigerants, the gas injection effect is not good and the economizer effect cannot be reflected. (2) The gas injection mass flow rate may cause gas-liquid mixing at the economizer port, reducing the gas injection efficiency and potentially damaging the compressor. With the development of refrigeration technology and the increasing requirements for refrigeration efficiency in application scenarios, it is of great significance to develop a structure that can inject gas more efficiently. Utility Model Content

[0003] This invention addresses the aforementioned problems by providing a dual economizer port structure for a screw compressor. This structure disperses the injection gas flow, reduces the injection gas velocity at a single economizer port, and minimizes gas-liquid mixing caused by high-speed flow. By setting dual injection gas channels in the same compression stage, it optimizes injection gas efficiency and system performance, significantly improving the compressor's refrigeration performance and energy efficiency ratio to meet the requirements for refrigeration capacity and energy saving under different operating conditions, thus achieving efficient injection gas.

[0004] The utility model is constructed as follows: it includes a compressor body and an exhaust housing disposed next to the compressor body. The upper and lower parts of the exhaust housing are respectively provided with a first air supply channel and a second air supply channel.

[0005] Furthermore, the input end of the first air replenishment channel is provided with a first economizer flange, which is connected to the exhaust housing via a first fixing member.

[0006] Furthermore, the input end of the second air supply channel is provided with a second economizer flange, which is connected to the exhaust housing via a second fixing member.

[0007] Furthermore, a first O-ring is provided on the side of the first economizer flange near the exhaust housing.

[0008] Furthermore, a second O-ring is provided on the side of the second economizer flange near the exhaust housing.

[0009] Furthermore, the compressor body includes a rotor housing and a rotor disposed inside the rotor housing.

[0010] Furthermore, the rotor is provided in two parts, including a first rotor and a second rotor.

[0011] Furthermore, it also includes a refrigerant main circuit and a refrigerant auxiliary circuit. The refrigerant main circuit is provided with a compressor, a condenser, an economizer, an expansion valve A and an evaporator in sequence. The refrigerant auxiliary circuit includes a first auxiliary circuit connected between the condenser and the economizer and two second auxiliary circuits output from the economizer and connected to the compressor. The two second auxiliary circuits are respectively connected to the first gas supply channel and the second gas supply channel of the compressor.

[0012] Furthermore, an expansion valve B is installed on the first auxiliary road.

[0013] Furthermore, the first and second fixing components are internal hexagonal cylindrical screws.

[0014] Compared with the prior art, this utility model has the following advantages: The device has a simple structure, reasonable design, and is easy to use. After the refrigerant is compressed in the compressor, it enters the condenser through the exhaust port. After condensing into a saturated liquid upon encountering cold, the refrigerant in the auxiliary refrigerant path enters the economizer to evaporate, thus subcooling the refrigerant in the main refrigerant path. The refrigerant evaporated into a gaseous state is divided into two paths through the auxiliary refrigerant path, entering the first and second replenishment channels from the first and second economizer flanges respectively, and then injected into the first and second rotors. It then mixes with the refrigerant in the compressor and continues to compress. This utility model introduces more intermediate pressure gas through dual economizer ports, significantly improving the cooling capacity and cooling efficiency. The dual economizer ports avoid excessively high exhaust temperature or a sudden drop in cooling capacity due to insufficient replenishment gas. The dual economizer ports balance the load of the compression chamber, making it suitable for long-term high-load operation and avoiding local overheating.

[0015] This device can be used in both single economizer port and dual economizer port modes. The dual economizer port mode disperses the gas supply flow, reduces the gas supply velocity at a single economizer port, and reduces gas-liquid mixing caused by high-speed flow. Both economizer ports can supply gas to the compressor at the same stage, thereby significantly improving the compressor's refrigeration performance and energy efficiency ratio to meet higher requirements for refrigeration capacity and energy saving under different operating conditions. Attached Figure Description

[0016] Figure 1 This is a partial structural diagram of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the overall connection of an embodiment of the present utility model. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Example: Figure 1-2 As shown, a dual economizer port structure for a screw compressor is provided, including a compressor body 1 and an exhaust housing 2 disposed beside the compressor body 1. The upper and lower parts of the exhaust housing are respectively provided with a first air supply channel 21 and a second air supply channel 22.

[0020] During operation: After being compressed in the compressor, the refrigerant enters the condenser through the exhaust port. Upon encountering the cold, it releases heat and condenses into a saturated liquid. The refrigerant in the auxiliary refrigerant circuit enters the economizer to evaporate, subcooling the refrigerant in the main refrigerant circuit. The refrigerant, now in a gaseous state, is divided into two paths through the auxiliary refrigerant circuit. It enters the first and second fuel injection channels from the first and second economizer flanges, respectively, and is injected into the first and second rotors. Then, it mixes with the refrigerant in the compressor and continues to compress.

[0021] Compared with the traditional single economy port, the beneficial effects of this utility model are: (1) the dual economy port introduces more intermediate pressure gas, and the cooling capacity and cooling efficiency are significantly improved; (2) the dual economy port avoids the exhaust temperature being too high or the cooling capacity dropping sharply due to insufficient gas supply; (3) the dual economy port balances the load of the compression chamber, which is suitable for long-term high-load operation and avoids local overheating.

[0022] This device can switch between single economizer port and dual economizer port modes. The single economizer port mode operates similarly to the traditional single economizer port mode and is suitable for conventional low-temperature conditions. However, the economizer port is responsible for the exchange of materials between the entire economizer system and the compressor. If this port malfunctions (such as due to blockage or leakage), it will affect the normal operation of the entire economizer system, thus impacting refrigeration efficiency. Therefore, this invention proposes a dual economizer port mode, which disperses the make-up gas flow, reduces the make-up gas velocity at a single economizer port, and minimizes gas-liquid mixing caused by high-speed flow. Both economizer ports can make make-up gas to the compressor simultaneously, significantly improving the compressor's refrigeration performance and energy efficiency ratio to meet higher requirements for cooling capacity and energy saving under different operating conditions.

[0023] In this embodiment of the utility model, the input end of the first air replenishment channel is provided with a first economizer flange 3, and the first economizer flange is connected to the exhaust housing via a first fixing member 4.

[0024] In this embodiment of the utility model, the input end of the second air supply channel is provided with a second economizer flange 6, and the second economizer flange is connected to the exhaust housing via a second fixing member 7.

[0025] In this embodiment of the present invention, a first O-ring 5 is provided on the side of the first economizer flange near the exhaust housing.

[0026] In this embodiment of the utility model, a second O-ring 10 is provided on the side of the second economizer flange near the exhaust housing.

[0027] In this embodiment of the present invention, the compressor body 1 includes a rotor housing 101 and a rotor disposed inside the rotor housing.

[0028] In this embodiment of the utility model, two rotors are provided, including a first rotor 102 and a second rotor 103.

[0029] In this embodiment of the utility model, a refrigerant main circuit 8 and a refrigerant auxiliary circuit 9 are also included. The refrigerant main circuit is provided with a compressor, a condenser 11, an economizer 12, an expansion valve A13 and an evaporator 14 in sequence. The refrigerant auxiliary circuit 9 includes a first auxiliary circuit 91 connected between the condenser and the economizer and two second auxiliary circuits 92 output from the economizer and divided into two circuits connected to the compressor. The two second auxiliary circuits are respectively connected to the first gas supply channel and the second gas supply channel of the compressor.

[0030] In this embodiment of the invention, an expansion valve B93 is provided on the first auxiliary road.

[0031] In this embodiment of the utility model, the first fixing member and the second fixing member are internal hexagonal cylindrical screws.

[0032] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0033] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.

[0034] Meanwhile, if the present invention discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, the mutually fixed connection can also be replaced by an integral structure (e.g., manufactured by casting process) (except where it is obviously impossible to use an integral forming process).

[0035] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0036] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A dual-economy port structure for a screw compressor, characterized in that, It includes a compressor body and an exhaust housing disposed next to the compressor body. The exhaust housing is provided with a first air supply channel and a second air supply channel in the upper and lower parts, respectively.

2. The dual economizer port structure of a screw compressor according to claim 1, characterized in that, The first air supply channel has a first economizer flange at its input end, and the first economizer flange is connected to the exhaust housing via a first fixing member.

3. The dual economizer port structure of a screw compressor according to claim 2, characterized in that, The second air supply channel has a second economizer flange at its input end, and the second economizer flange is connected to the exhaust housing via a second fastener.

4. The dual economizer port structure of a screw compressor according to claim 2, characterized in that, The first economizer flange is provided with a first O-ring on the side near the exhaust housing.

5. The dual-economy port structure of a screw compressor according to claim 3, characterized in that, The second economizer flange is provided with a second O-ring on the side near the exhaust housing.

6. The dual economizer port structure of a screw compressor according to claim 1, characterized in that, The compressor body includes a rotor housing and a rotor disposed inside the rotor housing.

7. The dual economizer port structure of a screw compressor according to claim 3, characterized in that, The rotor is provided in two parts, including a first rotor and a second rotor.

8. The dual economizer port structure of a screw compressor according to claim 1, characterized in that, It also includes a refrigerant main circuit and a refrigerant auxiliary circuit. The refrigerant main circuit is provided with a compressor, a condenser, an economizer, an expansion valve A and an evaporator in sequence. The refrigerant auxiliary circuit includes a first auxiliary circuit connected between the condenser and the economizer and two second auxiliary circuits output from the economizer and connected to the compressor. The two second auxiliary circuits are respectively connected to the first gas supply channel and the second gas supply channel of the compressor.

9. The dual-economy port structure of a screw compressor according to claim 8, characterized in that, An expansion valve B is installed on the first auxiliary road.

10. The dual economizer port structure of a screw compressor according to claim 3, characterized in that, The first and second fixing components are internal hexagonal cylindrical screws.

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