Compressor, control method thereof and refrigeration equipment

Abstract

The invention provides a compressor, a control method thereof and refrigeration equipment comprising the compressor. The compressor comprises a cavity with an air inlet and an air outlet, a piston doing reciprocating motion in the cavity, a motor controlling the piston to move, an air inlet pipeline and an air outlet pipeline, and the air inlet pipeline and the air outlet pipeline are communicated with the air inlet and the air outlet respectively. The air inlet pipeline and the air outlet pipeline are respectively provided with a first valve and a second valve which are used for connecting or disconnecting the air inlet pipeline and the air outlet pipeline. The valves are arranged at the air inlet end and the air outlet end of the compressor respectively, and when the compressor is shut down and started, the electric energy loss is reduced in the starting process of the compressor by controlling the two valves.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a compressor, a compressor control method, and a refrigeration equipment comprising the compressor. Background Art

[0002] The refrigerator compressor drives the piston to reciprocate through the rotation of the motor, constantly inhaling and exhausting air, generating negative pressure at the intake end and positive pressure at the exhaust end. Every time the compressor stops, there will be a pressure difference between the compressor intake and exhaust ports. After the traditional compressor stops, the pressure difference at both ends will gradually balance out.

[0003] In order to utilize the pressure difference at both ends of the compressor, some patents will use this pressure difference to drive the generator to store energy in the capacitor, so that the energy can be used to start the compressor at the next start, achieving energy saving. However, this method requires the addition of capacitors, which increases the cost of the compressor. Summary of the invention

[0004] The purpose of the present invention is to provide a compressor and a control method for the compressor. Valves are respectively set at the air inlet and air outlet ends of the compressor. When the compressor is stopped and started, the two valves are controlled to reduce the power loss during the compressor startup process, thereby solving the problem of setting capacitors for energy saving in the prior art.

[0005] In order to achieve one of the above-mentioned purposes of the invention, one embodiment of the present invention provides a compressor, including a cavity formed with an air inlet and an air outlet, a piston reciprocating in the cavity, a motor controlling the movement of the piston, an air inlet pipeline and an air outlet pipeline respectively connected to the air inlet and the air outlet, and the air inlet pipeline and the air outlet pipeline are respectively provided with a first valve and a second valve for connecting or disconnecting the air inlet pipeline and the air outlet pipeline.

[0006] An embodiment of the present invention further provides a method for controlling a compressor, wherein the compressor is the aforementioned compressor, and the control method comprises the following steps:

[0007] Get compressor shutdown signal;

[0008] Control the first valve to close. After the first valve is closed for T1 seconds, the motor is powered off.

[0009] After the motor stops rotating, the second valve is controlled to close and the compressor is shut down.

[0010] As a further improvement of an embodiment of the present invention, after the compressor is stopped, a compressor start signal is obtained;

[0011] Control the starting motor, and after the motor starts T2 seconds, control the first valve to open;

[0012] Detect the air pressure in the cavity. When the air pressure in the cavity reaches the preset pressure P 预 Finally, the second valve is controlled to open and the compressor starts to work stably.

[0013] As a further improvement of an embodiment of the present invention, T1 is 2 to 5 seconds.

[0014] As a further improvement of an embodiment of the present invention, after the motor is powered off, the motor stops rotating after 0.5 to 2 seconds.

[0015] As a further improvement of an embodiment of the present invention, after the motor stops rotating, the pressure on the side of the second valve close to the cavity in the outlet pipeline reaches P max , P max It is 350-450 kPa.

[0016] As a further improvement of an embodiment of the present invention, T2 is 1 to 2 seconds.

[0017] As a further improvement of an embodiment of the present invention, the preset pressure P 预 It is 300-400 kPa.

[0018] As a further improvement of an embodiment of the present invention, after the motor is started, the piston reaches a stable state after 2 to 3 seconds.

[0019] As a further improvement of an embodiment of the present invention, after the compressor works stably, the pressure of the air inlet pipeline is 50 kPa, and the pressure of the air outlet pipeline is 300-400 kPa.

[0020] An embodiment of the present invention further provides a refrigeration device, the refrigeration device comprising a compressor, and the compressor is the compressor as described above.

[0021] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0022] The compressor provided by the present invention is provided with a first valve and a second valve on the air inlet pipeline and the air outlet pipeline respectively, so that when the compressor is stopped and started, the closing and opening of the first valve and the second valve can be controlled to control the stopping and starting of the motor, so that after the compressor is stopped, the compressor cavity maintains a low pressure, and the resistance of the piston movement when the compressor is started is reduced, so that the motor can quickly reach a stable state, reduce power loss, and achieve the purpose of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a refrigeration system provided with a compressor in an embodiment of the present invention.

[0024] Figure 24 is a flow chart of a method for controlling a compressor in an embodiment of the present invention.

[0025] Figure 3 This is a current comparison diagram of the compressor control startup provided by an embodiment of the present invention and the conventional compressor startup.

[0026] T st1 It is the time required for the motor to reach a stable state during the starting process in this scheme;

[0027] T st2 It is the time required for the motor to reach a steady state during the normal compressor startup process;

[0028] I max It is the maximum current value when the motor starts;

[0029] I st max This is the current value after the motor starts to run stably.

[0030] 10. compressor; 20. condenser; 30. evaporator;

[0031] 1. Cavity; 11. Air inlet; 111. Air inlet valve; 12. Air outlet; 121. Air outlet valve; 13. First pressure gauge; 2. Piston; 3. Motor; 4. Air inlet pipeline; 41. First valve; 5. Air outlet pipeline; 51. Second valve; 52. Second pressure gauge. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Terms such as "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate spatial relative positions are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms of spatial relative positions may be intended to include different orientations of the device in use or operation other than the orientation shown in the drawings.

[0034] For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Also, it should be understood that although the terms first, second, etc. may be used herein to describe various elements or structures, these described objects should not be limited by these terms. These terms are only used to distinguish these described objects from each other.

[0037] For example, a first valve may be referred to as a second valve, and similarly, a second valve may be referred to as a first valve without departing from the scope of protection of the present application.

[0038] The embodiment of the present invention provides a compressor 10, which can be used to compress refrigerant for refrigeration equipment, such as Figure 1 The refrigeration system of the refrigeration equipment is shown. As indicated by the arrows in the figure, the refrigerant flows through the compressor 10, the condenser 20 and the evaporator 30 in sequence, and finally flows back to the compressor 10. Therefore, the embodiment of the present invention also provides a refrigeration equipment including the above compressor 10.

[0039] The aforementioned compressor 10 includes a cavity 1 formed with an air inlet 11 and an air outlet 12, a piston 2 that reciprocates in the cavity 1, a motor 3 that controls the movement of the piston 2, an air inlet pipeline 4 and an air outlet pipeline 5 that are respectively connected to the air inlet 11 and the air outlet 12, and the air inlet pipeline 4 and the air outlet pipeline 5 are respectively provided with a first valve 41 and a second valve 51 that connect or disconnect the air inlet pipeline 4 and the air outlet pipeline 5.

[0040] An air inlet valve 111 and an air outlet valve 121 are formed at the air inlet 11 and the air outlet 12 of the compressor 10 respectively. The compressor 10 is also provided with a first pressure gauge 13 for measuring the air pressure in the cavity 1 and a second pressure gauge 52 for measuring the air pressure in the air outlet pipeline 5.

[0041] When the motor 3 rotates, it drives the piston 2 to do reciprocating motion in the cavity 1. Figure 1As shown, when the piston 2 moves toward the direction approaching the motor 3, the volume of the cavity 1 increases, the inlet valve 111 opens, and gas is sucked into the cavity 1; when the piston 2 moves in the direction away from the motor 3, the volume of the cavity 1 decreases, the gas in the cavity 1 is compressed, the outlet valve 121 opens, and the compressed gas is discharged from the cavity 1 from the outlet 12, completing one compression.

[0042] A first valve 41 and a second valve 51 are respectively provided on the air inlet pipe 4 and the air outlet pipe 5 of the compressor 10. When the compressor 10 stops, the closing timing of the first valve 41 and the second valve 51 is controlled, and the timing of stopping the motor 3 is controlled, so that the cavity 1 of the compressor 10 can maintain a low pressure after the compressor 10 stops.

[0043] When the compressor 10 is started, the resistance to the movement of the piston 2 at low pressure is small, and at the same time, the air pressure outside the cavity 1 is high, which can apply a thrust to the piston 2, so that the piston 2 can reach the moving state from a stationary state more quickly. The piston 2 can quickly reach a stable state, reduce power consumption, achieve energy saving, and also reduce the impact on the power grid.

[0044] The specific control method for the compressor 10 includes the following steps:

[0045] Obtaining a compressor 10 shutdown signal;

[0046] The first valve 41 is controlled to be closed. After the first valve 41 is closed for T1 seconds, the motor 3 is controlled to be powered off.

[0047] After the motor 3 stops rotating, the second valve 51 is controlled to close, and the compressor 10 is shut down.

[0048] When the refrigeration system does not need refrigeration, the compressor 10 needs to be controlled to shut down. The first step of shutting down the compressor 10 is to close the first valve 41 to disconnect the air intake pipe 4, and the motor 3 continues to drive the piston 2 to reciprocate in the cavity 1.

[0049] Since the first valve 41 is closed, the piston 2 moves toward the motor 3 when performing reciprocating motion, and the volume of the cavity 1 increases, but gas cannot be sucked in from the air inlet 11; when the piston 2 moves away from the motor 3, the volume of the cavity 1 decreases, and the remaining gas in the cavity 1 is compressed and discharged through the air outlet 12. After repeated cycles of T1 seconds, a large amount of air in the cavity 1 is discharged, so that the air pressure in the cavity 1 is reduced.

[0050] Preferably, T1 is 2 to 5 seconds. After 2 to 5 seconds, the air pressure in the cavity 1 is reduced to a low pressure that can quickly reach a stable state when the piston 2 makes a reciprocating motion again, and then the motor 3 is powered off. After the motor 3 is powered off, the piston 2 still has a certain kinetic energy under the action of inertia and continues to rotate until the motor 3 stops rotating. When the piston 2 stops reciprocating motion, the second valve 51 is controlled to close.

[0051] Preferably, after the motor 3 is powered off, the motor 3 stops rotating after 0.5 to 2 seconds. In addition, after the motor 3 stops rotating, the second pressure gauge 52 in the gas outlet pipe 5 measures that the pressure on the side of the second valve 51 close to the cavity 1 reaches P max , P max The maximum pressure value that the air outlet pipeline 5 can withstand is 350 to 450 kPa.

[0052] After the motor 3 stops rotating and the piston 2 stops moving, the compressor 10 no longer compresses and discharges the gas in the cavity 1, and the pressure in the cavity 1 no longer decreases. Closing the second valve 51 can enable the compressor 10 to achieve sealing between the first valve 41 and the second valve 51, maintain the low pressure in the cavity 1, and prevent the air pressure at the inlet and outlet ends of the compressor 10 from gradually balancing.

[0053] After the compressor 10 is stopped, a compressor 10 start signal is obtained;

[0054] Control the motor 3 to start, and after T2 seconds of the motor 3 starting, control the first valve 41 to open;

[0055] Detect the air pressure in cavity 1. When the air pressure in cavity 1 reaches the preset pressure P 预 After that, the second valve 51 is controlled to open, and the compressor 10 starts to work stably.

[0056] After the compressor 10 is shut down, the refrigeration system controls to start the compressor 10 when refrigeration is needed, and first starts the motor 3, so that the motor 3 drives the piston 2 to move in the cavity 1. Since the second valve 51 is closed only when the air pressure in the cavity 1 is low enough when the compressor 10 is shut down, that is, when the piston 2 starts to move in the cavity 1, the air pressure is low, and the resistance to the movement of the piston 2 is small, the piston 2 can quickly reach the moving state from the static state, and then can quickly reach the stable state. After the motor 3 is started for T2 seconds, the first valve 41 is opened. At this time, the high air pressure from outside the cavity 1 gives a thrust to the piston 2 in the low-pressure state, which promotes the movement of the piston 2, and further promotes the piston 2 from the static state to the stable motion state, that is, reduces the consumption of electric energy.

[0057] Preferably, T2 is 1 to 2 seconds. The first valve 41 is opened 1 to 2 seconds after the motor 3 is turned on, so that the piston 2 in the cavity 1 first changes from a static state to a moving state under a low pressure state, and then immediately promotes the movement under the impetus of the high air pressure outside the cavity 1, so that the piston 2 can reach a stable moving state after 2 to 3 seconds after the motor 3 is started.

[0058] When the first pressure gauge 13 in the cavity 1 measures the air pressure value to reach the preset pressure P 预 After that, the second valve 51 is controlled to open, and the preset pressure P 预 The pressure of the air outlet pipeline 5 is close to that when the compressor 10 is working normally, thereby preventing backflow from the side of the air outlet pipeline 5 away from the cavity 1 when the second valve 51 is opened; and due to the large pressure difference, noise is generated when the second valve 51 is opened.

[0059] After the second valve 51 is opened, the compressor 10 as a whole enters a stable working state. After the compressor 10 works stably, the pressure of the air inlet pipeline 4 is usually 50 kPa, and the pressure of the air outlet pipeline 5 is usually 300-400 kPa.

[0060] It can be seen from this that the aforementioned preset pressure P 预 It is 300-400 kPa.

[0061] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0062] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A compressor, characterized in that: It includes a cavity formed with an air inlet and an air outlet, a piston that reciprocates in the cavity, a motor that controls the movement of the piston, an air inlet pipeline and an air outlet pipeline that are respectively connected to the air inlet and the air outlet, and the air inlet pipeline and the air outlet pipeline are respectively provided with a first valve and a second valve that connect or disconnect the air inlet pipeline and the air outlet pipeline.

2. A method for controlling a compressor, characterized in that: The compressor is the compressor according to claim 1, and the control method comprises the following steps: Get compressor shutdown signal; Control the first valve to close. After the first valve is closed for T1 seconds, the motor is powered off. After the motor stops rotating, the second valve is controlled to close and the compressor is shut down.

3. The compressor control method according to claim 2, characterized in that: After the compressor stops, obtain the compressor start signal; Control the starting motor, and after the motor starts T2 seconds, control the first valve to open; Detect the air pressure in the cavity. When the air pressure in the cavity reaches the preset pressure P 预 Finally, the second valve is controlled to open and the compressor starts to work stably.

4. The method for controlling a compressor according to claim 3, characterized in that: T1 is 2 to 5 seconds.

5. The compressor control method according to claim 4, characterized in that: After the motor is powered off, it will stop rotating after 0.5 to 2 seconds.

6. The method for controlling a compressor according to claim 5, characterized in that: After the motor stops rotating, the pressure on the side of the second valve close to the cavity in the outlet pipeline reaches P max , P max It is 350-450 kPa.

7. The method for controlling a compressor according to claim 3, characterized in that: T2 is 1 to 2 seconds.

8. The method for controlling a compressor according to claim 7, characterized in that: Preset pressure P 预 It is 300-400 kPa.

9. The method for controlling a compressor according to claim 8, characterized in that: After the motor is started, the piston reaches a stable state after 2 to 3 seconds.

10. The method for controlling a compressor according to claim 3, characterized in that: After the compressor is working stably, the pressure of the air inlet pipeline is 50 kPa and the pressure of the air outlet pipeline is 300-400 kPa.

11. A refrigeration device, comprising a compressor, characterized in that: The compressor is the compressor according to claim 1.

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