Compressor and air source heat pump

Abstract

The present invention provides a compressor and an air source heat pump. The compressor includes a first cylinder and at least one second cylinder connected in sequence, and along the rotation direction of the rotor in the second cylinder, the second cylinder is provided with an air supply port, an air intake port and an exhaust port in sequence. The compressor and air source heat pump provided by the present invention enable the rotor in the second cylinder to sequentially sweep the air supply port, the air intake port and the exhaust port, so that the second cylinder is firstly supplied with air before the air intake is performed, and the air supply pressure of all the second cylinders can be the same, which overcomes the problem in the prior art that the air supply pressure must be greater than the air intake pressure of the second cylinder, the air supply pressure requirement is too high, and the air supply pressure in each cylinder cannot be the same, effectively reducing the difficulty of supplying air to increase enthalpy of the compressor, and ensuring the heat exchange effect of the air source heat pump in a low temperature environment.

Description

Technical Field

[0001] The invention relates to the technical field of compression equipment, in particular to a compressor and an air source heat pump. Background Art

[0002] As people's living standards improve, heating needs will further increase. Air source heat pumps are widely used in central my country due to their high efficiency, energy saving, environmental protection, wide applicability and easy installation. At the same time, as a new sustainable heating method, they have received widespread attention from countries around the world. However, under low temperature conditions, the compressor cannot meet the load requirements of the air source heat pump system, resulting in poor air source heat pump system effects. The technical solution used in the prior art is to add air to increase enthalpy after the compressor cylinder inhales air, but this approach requires a large air supply pressure, and the air supply pressure of each cylinder cannot be the same. Summary of the invention

[0003] In order to solve the technical problem in the prior art that the compressor replenishes air after inhaling air and has a high demand for replenishing air pressure, a compressor and an air source heat pump are provided which replenish air before the cylinder inhales air and reduce the demand for replenishing air pressure.

[0004] A compressor comprises a first cylinder and at least one second cylinder which are connected in sequence, and an air supply port, an air intake port and an air exhaust port are arranged in sequence on the second cylinder along the rotation direction of the rotor in the second cylinder.

[0005] An opening and closing mechanism is provided at the air supply port. In the same second cylinder, when the rotor sweeps over the air supply port, the opening and closing mechanism switches to an open state, and when the rotor sweeps over the air intake port, the opening and closing mechanism switches to a closed state.

[0006] The air supply pressures of the air supply ports on all the second cylinders are the same.

[0007] The compressor further comprises a shell, an air supply passage is arranged in the shell, and the air supply ports of all the second cylinders are in communication with the air supply passage.

[0008] The compressor further includes a slide valve, and the slide valve is arranged between the air supply port and the air discharge port.

[0009] The number of the second cylinders is two, and the two second cylinders include a first-stage sub-cylinder and a second-stage sub-cylinder. The exhaust port of the first-stage sub-cylinder is connected to the intake port of the second-stage sub-cylinder, and the exhaust port of the first cylinder is connected to the intake port of the first-stage sub-cylinder.

[0010] An air source heat pump comprises the above-mentioned compressor.

[0011] The compressor and air source heat pump provided by the present invention enable the rotor in the second cylinder to sweep the air supply port, the air intake port and the exhaust port in sequence, so that the second cylinder is supplied with air before the air intake is performed, and the supply pressures of all the second cylinders can be the same, which overcomes the problem in the prior art that the supply pressure must be greater than the air intake pressure of the second cylinder, the supply pressure requirement is too high and the supply pressure in each cylinder cannot be the same, effectively reduces the difficulty of supplying air to increase the enthalpy of the compressor, and ensures the heat exchange effect of the air source heat pump in a low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of a compressor according to an embodiment of the present invention;

[0013] Figure 2 A schematic structural diagram of a second cylinder in an embodiment provided by the present invention;

[0014] Figure 3 A structural schematic diagram of the second cylinder of the embodiment provided by the present invention entering the gas replenishment state;

[0015] Figure 4 A schematic structural diagram of a second cylinder in an embodiment provided by the present invention that is about to exit a gas-supplementing state;

[0016] Figure 5 A schematic diagram of the structure of the second cylinder of the embodiment provided by the present invention entering the intake and exhaust state;

[0017] Figure 6 A structural schematic diagram of the second cylinder of the embodiment provided by the present invention in a state of being about to exit the intake and exhaust state

[0018] In the figure:

[0019] 1. First cylinder; 2. Second cylinder; 21. Air intake port; 22. Air supply port; 23. Exhaust port; 3. Sliding valve; 24. First-stage sub-cylinder; 25. Second-stage sub-cylinder. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figures 1 to 6The compressor shown in the figure comprises a first cylinder 1 and at least one second cylinder 2 which are connected in sequence. Along the rotation direction of the rotor in the second cylinder 2, the second cylinder 2 is provided with an air supply port 22, an air intake port 21 and an air discharge port 23 in sequence. That is, the rotor in the second cylinder 2 sequentially sweeps over the air supply port 22, the air intake port 21 and the air discharge port 23. When the second cylinder 2 is working, it performs air supply, air intake and air discharge in sequence. When the rotor sweeps over the air supply port 22, the air supply port 22 is opened to supply air to the second cylinder 2. After the air supply is completed, the second cylinder 2 starts to inhale. When the set pressure is reached, the second cylinder 2 is discharged to complete the compression process. This overcomes the problem in the prior art that air supply is performed only after the cylinder inhales and the air supply pressure needs to be greater than the air intake pressure, reduces the demand for air supply pressure, and on the premise of ensuring the working efficiency of the compressor in a low temperature environment, the compression efficiency of the compressor is relatively improved because the air supply pressure is lower than the air supply pressure in the prior art.

[0022] The air supply port 22 is provided with an opening and closing mechanism. In the same second cylinder 2, when the rotor sweeps over the air supply port 22, the opening and closing mechanism switches to an open state, and when the rotor sweeps over the air intake port 21, the opening and closing mechanism switches to a closed state. That is, when the rotor passes over the air supply port 22, it indicates that gas can be inhaled into the second cylinder 2 at this time. At this time, the air supply port 22 is opened, and the low-pressure gas is sent into the second cylinder 2 through the air supply port 22 for air supply and enthalpy increase. When the rotor passes over the air intake port 21, it indicates that a gas with a relatively high pressure (the pressure value is greater than the air supply pressure value at the air supply port 22) will enter the second cylinder 2 at this time. At this time, the air supply port 22 must be closed to prevent the gas entering the second cylinder 2 from the air intake port 21 from being discharged from the air supply port 22, so as to ensure that the second cylinder 2 can smoothly carry out the compression process.

[0023] Since all the second cylinders 2 are replenished before the air is inhaled, there is actually no pressure inside all the second cylinders 2 when replenishing air, so a lower replenishing air pressure can be used for replenishing air, that is, the replenishing air pressure of the replenishing air ports 22 on all the second cylinders 2 is the same. This overcomes the problem in the prior art that the replenishing air pressure must be greater than the air inhalation pressure of the second cylinder 2, which is too high and the replenishing air pressure in each cylinder cannot be the same, effectively reduces the difficulty of replenishing air to increase enthalpy of the compressor, and ensures the heat exchange effect of the air source heat pump in a low temperature environment.

[0024] The compressor further comprises a shell, an air supply passage is arranged in the shell, and the air supply ports 22 of all the second cylinders 2 are in communication with the air supply passage.

[0025] The compressor further includes a slide valve 3, which is disposed between the air supply port 22 and the exhaust port 23. The interior of the second cylinder 2 is divided into an intake area and an exhaust area with a constantly changing volume by the slide valve 3, and the slide valve 3 cooperates with the rotor to realize the switching of the compressor between intake and exhaust. When the rotor passes the position of the slide valve 3, it indicates that the second cylinder 2 is switched from the exhaust stage to the intake stage at this time, and in order to maximize the air supply effect, the air supply port 22 is disposed as close to the slide valve 3 as possible.

[0026] The number of the second cylinders 2 is two, and the two second cylinders 2 include a first-stage sub-cylinder 24 and a second-stage sub-cylinder 25. The exhaust port 23 of the first-stage sub-cylinder 24 is connected to the intake port 21 of the second-stage sub-cylinder 25, and the exhaust port 23 of the first cylinder 1 is connected to the intake port 21 of the first-stage sub-cylinder 24. When the compressor is working, the first cylinder 1 inhales air for the first-stage compression. After the first-stage compression is completed, the first cylinder 1 discharges the exhaust gas to the intake port 21 of the first-stage sub-cylinder 24, and the first-stage sub-cylinder 24 performs the second-stage compression. After the second-stage compression is completed, the first-stage sub-cylinder 24 discharges the exhaust gas to the intake port 21 of the second-stage sub-cylinder 25, and the second-stage sub-cylinder 25 performs the third-stage compression. At the same time, during the second-stage compression and the third-stage compression, air can be supplemented to increase enthalpy as needed. After the third-stage compression is completed, the second-stage sub-cylinder 25 discharges the exhaust gas out of the compressor, and the compressor completes the compression process.

[0027] An air source heat pump comprises the above-mentioned compressor.

[0028] 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 first cylinder (1) and at least one second cylinder (2) connected in sequence, characterized in that: Along the rotation direction of the rotor in the second cylinder (2), the second cylinder (2) is provided with an air supply port (22), an air intake port (21) and an air exhaust port (23) in sequence; the rotor in the second cylinder (2) sequentially sweeps over the air supply port (22), the air intake port (21) and the air exhaust port (23); when the second cylinder (2) is working, air supply, air intake and air exhaust are performed in sequence; when the rotor sweeps over the air supply port (22), the air supply port (22) is opened to supply air to the second cylinder (2); after the air supply is completed, the second cylinder (2) starts to inhale air; and when a set pressure is reached, the second cylinder (2) exhausts air to complete the compression process; the air supply pressure of the second cylinder (2) is lower than the air intake pressure of the second cylinder (2); an opening and closing mechanism is provided at the air supply port (22); In the second cylinder (2), when the rotor sweeps over the air supply port (22), the opening and closing mechanism switches to an open state, and when the rotor sweeps over the air intake port (21), the opening and closing mechanism switches to a closed state; the air supply pressures of the air supply ports (22) on all the second cylinders (2) are the same; the compressor further comprises a slide valve (3), wherein the slide valve (3) is arranged between the air supply port (22) and the exhaust port (23); the number of the second cylinders (2) is two, and the two second cylinders (2) comprise a first-stage sub-cylinder (24) and a second-stage sub-cylinder (25); the exhaust port (23) of the first-stage sub-cylinder (24) is connected to the air intake port (21) of the second-stage sub-cylinder (25), and the exhaust port (23) of the first cylinder (1) is connected to the air intake port (21) of the first-stage sub-cylinder (24).

2. The compressor according to claim 1, characterized in that: The compressor further comprises a shell, an air supply channel is arranged in the shell, and the air supply ports (22) of all the second cylinders (2) are in communication with the air supply channel.

3. An air source heat pump, characterized in that: Comprising the compressor according to claim 1 or 2.

Images