Compressor and refrigeration unit with effect of reducing air supply pressure drop

Abstract

The present invention provides a compressor and a refrigeration unit with the effect of reducing the pressure drop of supplementary air. The compressor includes a shell, a compression chamber is formed inside the shell, and a supplementary air chamber is also provided on the shell. The compressor and refrigeration unit with the effect of reducing the pressure drop of supplementary air provided by the present invention directly provide the supplementary air chamber on the shell, which overcomes the problem in the prior art that an additional buffer tank is provided on the supplementary air pipeline to reduce the vibration caused by the supplementary air pipeline and increase the cost and size of the unit, effectively simplifies the unit structure, reduces the cost of the unit, and at the same time reduces the diameter of the connecting hole, reduces the connection time and the connecting area between adjacent tooth grooves, thereby reducing the problem of gas leakage between adjacent tooth grooves, thereby achieving the purpose of reducing pressure pulsation and reducing pressure drop, and improving the volumetric efficiency of the compressor during compression, thereby improving the efficiency of the compressor and the refrigeration unit.

Description

Technical Field

[0001] The invention relates to the technical field of compression devices, in particular to a compressor and a refrigeration unit capable of reducing the pressure drop of supplementary air. Background Art

[0002] When the refrigeration unit is running under some working conditions, a part of the refrigerant will absorb heat through expansion and evaporation to cool the other part of the gaseous refrigerant, and then enter the middle compression section of the compressor to continue circulating. The cooled refrigerant obtains a higher degree of supercooling, the exhaust temperature is reduced, the cooling capacity is increased, and the application range of the refrigeration unit is also broadened. At present, during the operation of the refrigeration unit, the refrigerant after evaporation and heat exchange enters the rotor tooth groove in the compression process through the unit's air supply pipeline and the compressor air supply orifice, and joins the next compression and exhaust cycle. However, since the compressor tooth groove is constantly advancing toward the compressor exhaust end, the pressure in a single tooth groove increases during the process of connecting with the air supply orifice, and when two adjacent tooth grooves are connected to the air supply orifice successively, the pressure will drop suddenly, and the diameter D of the air supply orifice causes a short connection between the two tooth grooves. At the same time, for a period of time, the pressure of the refrigerant added to the compressor after cooling and heat exchange also fluctuates. Therefore, during the air supply process, there will be air flow pulsation in the entire air supply flow channel, causing fluctuations in the air supply volume, reduced rotor volumetric efficiency, and vibration and noise problems of the compressor and the unit as a whole. Summary of the invention

[0003] In order to solve the technical problem that during the air replenishment process of the existing compressor, pressure drop is caused by the connection of the air replenishment holes, a compressor and a refrigeration unit with the effect of reducing the air replenishment pressure drop are provided, which are provided with an air replenishment cavity and reduce the diameter of the connecting hole connected to the compression cavity while ensuring the air replenishment effect.

[0004] A compressor comprises a shell, a compression chamber is formed inside the shell, an air-injection chamber is also arranged on the shell, an air-injection hole connected with an air-injection structure is arranged on the air-injection chamber, and a connecting hole is arranged between the air-injection chamber and the compression chamber, and the diameter of the connecting hole is smaller than the diameter of the air-injection hole.

[0005] There are multiple communicating holes, all of which are connected to the air supplement cavity, and the sum of the flow areas of all of the communicating holes is equal to the flow area of ​​the air supplement hole.

[0006] A rotor is arranged in the compression chamber, and spiral teeth are arranged on the circumferential side of the rotor. All the communication holes are arranged in sequence along the spiral direction of the spiral teeth. During the rotation of the rotor, the spiral teeth sweep through all the communication holes at the same time.

[0007] The apertures of all the communicating holes are equal.

[0008] The helical teeth have a tooth top, and a width of the tooth top is smaller than a diameter of the communicating hole.

[0009] There is a distance between two adjacent communicating holes, and the distance is smaller than the diameter of the communicating hole.

[0010] The air supplement cavity has a first side wall away from the rotor and a second side wall close to the rotor, the air supplement hole is arranged on the first side wall, and the connecting hole is arranged on the second side wall.

[0011] A refrigeration unit comprises the above-mentioned compressor.

[0012] The compressor and refrigeration unit with the effect of reducing the pressure drop of supplementary air provided by the present invention directly set the supplementary air chamber on the shell, which overcomes the problem of additionally setting a buffer tank on the supplementary air pipeline in the prior art to reduce the vibration caused by the supplementary air pipeline and increase the cost and size of the unit, effectively simplifies the unit structure, reduces the unit cost, and at the same time reduces the diameter of the connecting hole, reduces the connection time and connection area between adjacent tooth grooves, thereby reducing the problem of gas leakage between adjacent tooth grooves, thereby achieving the purpose of reducing pressure pulsation and reducing pressure drop, and improving the volumetric efficiency of the compressor during compression, thereby improving the efficiency of the compressor and the refrigeration unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of a compressor of an embodiment of a compressor and a refrigeration unit with the effect of reducing the air supply pressure drop provided by the present invention;

[0014] Figure 2 A projection view of the connecting hole on the rotor of an embodiment of a compressor and a refrigeration unit with the effect of reducing the air supply pressure drop provided by the present invention;

[0015] In the figure:

[0016] 1. Shell; 2. Compression chamber; 3. Air supply chamber; 4. Air supply hole; 5. Connecting hole; 6. Rotor; 7. Helical teeth. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] like Figure 1 and Figure 2The compressor shown includes a shell 1, a compression chamber 2 is formed inside the shell 1, and an air-injection chamber 3 is also provided on the shell 1. After the refrigerant after evaporation and heat exchange enters the compressor through the air-injection pipeline of the unit, it first enters the air-injection chamber 3, thereby ensuring that the refrigerant is less affected by the air flow pulsation in the air-injection pipeline of the unit before passing through the air-injection orifice of the compressor, and is also less affected by the air flow pulsation caused by the gas back-injection after the rotor tooth groove is connected with the air-injection orifice during the compression process, thereby ensuring the stability of the air-injection process and reducing the vibration and noise caused by the air flow. The air-injection chamber 3 is provided with an air-injection hole 4 connected with the air-injection structure, and the A connecting hole 5 is provided on the air supply chamber 3 and between the air supply chamber 2, which overcomes the problem in the prior art that an additional buffer tank is provided on the air supply pipeline to reduce the vibration caused by the air supply pipeline and increase the cost and size of the unit, effectively simplifies the unit structure and reduces the unit cost. The diameter of the connecting hole 5 is smaller than the diameter of the air supply hole 4. Reducing the diameter of the connecting hole 5 reduces the connection time and connection area between adjacent tooth grooves, thereby reducing the problem of gas leakage between adjacent tooth grooves, thereby achieving the purpose of reducing pressure pulsation and reducing pressure drop, and improving the volumetric efficiency of the compressor during compression, thereby improving the efficiency of the compressor and the refrigeration unit.

[0019] There are multiple communicating holes 5 , all of which are connected to the air replenishing cavity 3 , and the sum of the flow areas of all communicating holes 5 is equal to the flow area of ​​the air replenishing hole 4 , thereby ensuring the air replenishing effect of the compressor.

[0020] A rotor 6 is arranged in the compression chamber 2, and spiral teeth 7 are arranged on the circumferential side of the rotor 6, and all the connecting holes 5 are arranged in sequence along the spiral direction of the spiral teeth 7, and during the rotation of the rotor 6, the spiral teeth 7 simultaneously sweep over all the connecting holes 5, so that the compressor can replenish air in the air replenishment chamber 3 and only replenish one spiral tooth 7 groove during the air replenishment process, and when the spiral teeth 7 sweep over the connecting hole 5, the connection time and connection area between two adjacent spiral tooth 7 grooves through the air replenishment chamber 3 can be reduced as much as possible, thereby reducing air flow pulsation, reducing vibration and noise caused by air replenishment, reducing gas leakage between adjacent tooth grooves, and improving the volumetric efficiency of the rotor 6, thereby improving the efficiency of the compressor and the unit.

[0021] The apertures of all the connecting holes 5 are equal, ensuring that the gas replenishment pressure at each connecting hole 5 is the same, thereby ensuring the gas replenishment effect.

[0022] The spiral teeth 7 have tooth tops, and the width of the tooth tops is smaller than the diameter of the connecting hole 5, which increases the connecting time of the connecting hole 5, thereby ensuring the gas replenishing effect.

[0023] There is a distance between two adjacent communicating holes 5 , and the distance is smaller than the diameter of the communicating hole 5 .

[0024] The air replenishment cavity 3 has a first side wall away from the rotor 6 and a second side wall close to the rotor 6. The air replenishment hole 4 is arranged on the first side wall, and the connecting hole 5 is arranged on the second side wall. The lengths of the air replenishment hole 4 and the connecting hole 5 are reduced as much as possible to increase the air replenishment effect.

[0025] A refrigeration unit comprises the above-mentioned compressor.

[0026] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A compressor, comprising a housing (1), wherein a compression chamber (2) is formed inside the housing (1), and characterized in that: The shell (1) is also provided with an air replenishing chamber (3), the air replenishing chamber (3) is provided with an air replenishing hole (4) communicating with the air replenishing structure, and the air replenishing chamber (3) is provided with a communicating hole (5) communicating with the compression chamber (2), the diameter of the communicating hole (5) being smaller than the diameter of the air replenishing hole (4); the number of the communicating holes (5) is plural, a rotor (6) is provided in the compression chamber (2), the circumferential side of the rotor (6) is provided with helical teeth (7), and all the communicating holes (5) are arranged in sequence along the helical direction of the helical teeth (7), and during the rotation of the rotor (6), the helical teeth (7) simultaneously sweep over all the communicating holes (5); the apertures of all the communicating holes (5) are equal; the helical teeth (7) have tooth tops, and the width of the tooth tops is smaller than the diameter of the communicating holes (5).

2. The compressor according to claim 1, characterized in that: All the communicating holes (5) are in communication with the air replenishing cavity (3), and the sum of the flow areas of all the communicating holes (5) is equal to the flow area of ​​the air replenishing hole (4).

3. The compressor according to claim 1, characterized in that: There is a spacing between two adjacent communicating holes (5), and the size of the spacing is smaller than the diameter of the communicating hole (5).

4. The compressor according to claim 1, characterized in that: The air supplement cavity (3) has a first side wall away from the rotor (6) and a second side wall close to the rotor (6), the air supplement hole (4) is arranged on the first side wall, and the communication hole (5) is arranged on the second side wall.

5. A refrigeration unit, characterized in that: A compressor comprising the compressor according to any one of claims 1 to 4.

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