Starting relay, compressor delayed starting circuit, compressor and refrigeration equipment

Abstract

The invention provides a starting relay, a compressor delay starting circuit, a compressor and refrigeration equipment, and the starting relay comprises a relay housing which is internally provided with a switch switching piece, a normally open contact, a normally closed contact and a movable contact piece. The switch switching piece is provided with an open position and a closed position, the open position enables the contact head of the movable contact piece to be in contact with the normally open contact, the closed position enables the contact head of the movable contact piece to be in contact with the normally closed contact, and in the switching process of the switch switching piece from the closed position to the open position, the damping assembly is arranged on the switch switching piece. The damping assembly can exert damping force on the switch switching piece so as to delay disconnection of the movable contact piece and the normally-closed contact. The running time of the motor with the starting capacitor and the running capacitor is longer, and the rotating speed is higher during capacitor switching, so that the on-load starting capability of the motor is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to a starting relay, a compressor delayed starting circuit, a compressor and a refrigeration device. Background Art

[0002] At present, commercial refrigeration compressors need to be started frequently due to the special working environment, and there is a pressure difference in the pipeline during startup. Compared with conventional refrigeration compressors, the motor requires a larger starting torque. This process is usually controlled by the starting relay. The starting relay coil is a voltage-type coil connected to the two ends of the compressor auxiliary phase. After detecting that the voltage rises to the action voltage, the moving contact piece is actuated, and the starting capacitor plus the running capacitor are started in parallel. After the start is completed, the starting capacitor is disconnected. However, since the voltage-type coil moves very quickly, this process is very short. When the system load is heavy, the speed is not increased to the torque inflection point before the starting capacitor is disconnected, resulting in starting failure. The improvement of the compressor's load starting ability is limited. Summary of the invention

[0003] Therefore, the present invention provides a starting relay, a compressor delayed starting circuit, a compressor and a refrigeration equipment, which can overcome the technical problems in the related art that the coil in the starting relay has a fast action speed, resulting in a short switching time of the moving contact piece, and the starting capacitor is disconnected before the compressor speed is increased to the torque inflection point when the system load is heavy, resulting in starting failure and limited improvement in the compressor's load starting capacity.

[0004] In order to solve the above problems, the present invention provides a starting relay, including a relay housing, wherein the relay housing has an assembly space, wherein a driving component, a switch switching component, a normally open contact, a normally closed contact, and a moving contact are arranged in the assembly space, wherein the switch switching component has an open position in which a contact head of the moving contact piece contacts the normally open contact, and a closed position in which a contact head of the moving contact piece contacts the normally closed contact, wherein the driving component is used to drive the switch switching component to switch between the open position and the closed position, and further includes a damping component, wherein during the switching process of the switch switching component from the closed position to the open position, the damping component can apply a damping force to the switch switching component to delay the disconnection of the moving contact piece from the normally closed contact.

[0005] In some embodiments, the damping assembly includes a damping member and a connecting rod, the first end of the connecting rod is connected to the switch switching member, and the second end of the connecting rod is inserted into a damping cavity of the damping member, and when the switch switching member is switched from the closed position to the open position, the damping cavity applies a damping force to the switch switching member via the connecting rod.

[0006] In some embodiments, the damping member is a cylinder, the second end of the connecting rod is formed as a piston inserted into the cylinder mouth of the cylinder, and an air hole connecting the damping chamber with the external atmosphere is formed on the cylinder wall of the cylinder; and / or the connecting rod is hinged to the switch switching member.

[0007] In some embodiments, the driving component includes an energized coil, and the switch member is an armature.

[0008] In some embodiments, the armature has a limiting through hole for accommodating the free end of the moving contact piece, and the limiting through hole has a first limiting wall and a second limiting wall. The switch switching member relies on the first limiting wall to abut against the first side surface of the free end of the moving contact piece so that the contact head of the moving contact piece contacts the normally open contact. The switch switching member relies on the second limiting wall to abut against the second side surface of the free end of the moving contact piece so that the contact head of the moving contact piece contacts the normally closed contact. The first side surface and the second side surface are two opposite sides of the moving contact piece, and the distance between the first limiting wall and the second limiting wall is greater than the thickness of the moving contact piece between the first side surface and the second side surface.

[0009] In some embodiments, the driving component also includes an elastic reset member, which applies force to the switch switching member to switch the switch switching member from the open position to the closed position when the power-on coil is disconnected or the magnetic attraction force generated is insufficient to overcome the elastic force of the elastic reset member. The power-on coil can rely on the magnetic attraction force to overcome the elastic force of the elastic reset member to switch the switch switching member from the closed position to the open position when it is energized.

[0010] In some embodiments, a bracket is further provided in the assembly space, the energized coil is assembled on the bracket, and the switch switching member and the bracket are hinged at a first point, and the force application point of the elastic reset member on the switch switching member and the force application point of the connecting rod and the switch switching member are respectively located on both sides of the first point; and / or the elastic reset member is a coil spring.

[0011] In some embodiments, a discharge resistor is also provided in the assembly space, and a first pin, a second pin, a third pin and a fourth pin are provided on the relay housing, wherein the first pin is electrically connected to the first end of the energized coil, the second pin is electrically connected to the normally open contact and to the second end of the energized coil, the third pin is electrically connected to the fixed end of the moving contact piece, the fourth pin is electrically connected to the first end of the discharge resistor, and the second end of the discharge resistor is electrically connected to the normally closed contact.

[0012] The present invention also provides a compressor delayed start circuit, comprising the above-mentioned starting relay, starting capacitor, running capacitor, main phase winding and auxiliary phase winding, wherein the starting capacitor is connected between the third pin and the fourth pin, the running capacitor is connected between the main phase winding and the second pin, and between the first pin and the common phase of the main phase winding and the auxiliary phase winding.

[0013] The present invention also provides a compressor, comprising the above-mentioned compressor delayed starting circuit.

[0014] The present invention also provides a refrigeration device, comprising the above compressor.

[0015] A starting relay, a compressor delayed starting circuit, a compressor and a refrigeration device provided by the present invention have the following beneficial effects:

[0016] By setting a damping component in the starter relay, the damping component is used to apply a damping force to the switch switching member during the switching process of the switch switching member from the closed position to the open position, so that the moving contact piece and the normally closed contact will not be disconnected quickly but can be disconnected with a relatively delayed connection, the time for the starting capacitor in the corresponding circuit to be cut off is extended, the time for the motor to run with the starting capacitor and the running capacitor is longer, and the speed is higher when the capacitor is switched, thereby enhancing the ability of the motor to start with load. In addition, the damping component is used in the present application to achieve a mechanical delay of the moving contact piece, and the structure is simple and does not require a control logic design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 Schematic diagram of the internal structure of the starting relay in the embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the principle of a compressor delayed start circuit in another embodiment of the present invention, showing that the circuit is in a starting state;

[0020] Figure 3 1 is a schematic diagram of the principle of a compressor delayed start circuit in another embodiment of the present invention, and the circuit is shown in an operating state.

[0021] The accompanying drawings are marked as follows:

[0022] 1. Relay housing; 211. Energized coil; 212. Elastic reset member; 22. Switch switching member; 221. Limiting through hole; 231. Normally open contact; 232. Normally closed contact; 24. Moving contact piece; 31. Damping member; 32. Connecting rod; 4. Bracket; 5. Discharge resistor; 61. First pin; 62. Second pin; 63. Third pin; 64. Fourth pin; 101. Starting capacitor; 102. Running capacitor; 103. Main phase winding; 104. Second phase winding; 105. Spray solenoid valve; 106. Pressure switch; 107. Temperature controller. DETAILED DESCRIPTION

[0023] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0024] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0027] See also Figures 1 to 3 As shown, according to an embodiment of the present invention, a starting relay is provided, including a relay housing 1, wherein the relay housing 1 has an assembly space (not labeled in the figure), wherein the assembly space is provided with a driving component (not labeled in the figure), a switch switching member 22, a normally open contact 231, a normally closed contact 232, and a moving contact piece 24, wherein the aforementioned contacts may be constructed into a contact piece structure in some cases, wherein the moving contact piece 24 has a contact head and a fixed end, wherein the fixed end is also a position holding portion of the moving contact piece 24, and the contact head is a portion thereof that selects to contact with a certain contact point to realize circuit on-off control, wherein the switch switching member 22 has an open position in which the contact head of the moving contact piece 24 contacts the normally open contact 231, and a closed position in which the contact head of the moving contact piece 24 contacts the normally closed contact 232, so as to achieve a desired circuit. Figure 1 The orientation shown is for reference only. The aforementioned disconnected position is the state in which the moving contact piece 24 swings downward, and the aforementioned closed position is the state in which the moving contact piece 24 swings upward. The driving component is used to drive the switch switching member 22 to switch between the disconnected position and the closed position, and also includes a damping component (not marked in the figure). During the switching process of the switch switching member 22 from the closed position to the disconnected position, the damping component can apply a damping force to the switch switching member 22 to delay the disconnection of the moving contact piece 24 and the normally closed contact 232.

[0028] In this technical solution, by setting a damping component in the starter relay, the damping component is used to apply a damping force to the switch switching member 22 during the switching process of the switch switching member 22 from the closed position to the open position, so that the moving contact piece 24 and the normally closed contact 232 will not be disconnected quickly but can be disconnected with a relatively delayed connection, the time for the starting capacitor in the corresponding circuit to be cut off is extended, the time for the motor to run with the starting capacitor and the running capacitor is longer, and the speed is higher when the capacitor is switched, thereby enhancing the ability of the motor to start with load. In addition, the damping component is used in this application to achieve a mechanical delay of the moving contact piece 24, and the structure is simple and does not require a control logic design.

[0029] In a specific embodiment, the damping assembly includes a damping member 31 and a connecting rod 32, wherein the first end of the connecting rod 32 is connected to the switch switching member 22, and the second end of the connecting rod 32 is inserted into the damping cavity of the damping member 31. When the switch switching member 22 switches from the closed position to the open position, the damping cavity applies a damping force to the switch switching member 22 via the connecting rod 32. The structure is simple and easy to implement. The damping member 31 can be Figure 1 In the orientation shown, any structure that applies force to the switch member 22 during the downward swing of the movable contact piece 24 and thereby delays the disconnection of the movable contact piece 24 and the normally closed contact 232 can be selected, such as an oil damper.

[0030] In a preferred embodiment, the damping member 31 is a cylinder, the second end of the connecting rod 32 is formed as a piston inserted into the cylinder mouth of the cylinder, and an air hole connecting the damping chamber with the external atmosphere is formed on the cylinder wall of the cylinder (not shown and not labeled in the figure).

[0031] In this technical solution, a cylinder is used as the damping member 31. Compared with other types of damping members, it has a simple structure and low cost. In this technical solution, by providing an air hole connected to the external atmosphere on the cylinder wall, the external atmosphere can be sucked into the cylinder through the air hole during the switching process of the switch switching member 22 from the disconnected position to the closed position. Thereafter, when the switch switching member 22 is switched from the closed position to the disconnected position, the connecting rod 32 will compress the gas in the cylinder to a certain extent (the degree of compression is limited by the aperture of the air hole), and the compressed air is slowly discharged from the air hole, thereby forming gas damping, thereby achieving the purpose of delaying disconnection.

[0032] In some embodiments, the connecting rod 32 is hinged to the switch switching member 22, for example, using a ball joint. This can prevent the connecting rod 32 from sliding stuck (unsmoothly) relative to the cylinder due to a large displacement deviation of the connection point between the connecting rod 32 and the switch switching member 22 caused by an error in the assembly size.

[0033] In some embodiments, the driving component includes a power-carrying coil 211. It is understandable that the power-carrying coil 211 should be arranged around an iron core, and the switch switching member 22 is an armature.

[0034] In this technical solution, when the energized coil 211 is energized (large enough), it will cause the iron core provided with it to generate magnetism, and through this magnetism, the magnetic adsorption ability of the armature is realized, thereby achieving the purpose of switching the position of the switch switching member 22 when energized. The control is simple and the structure is simple.

[0035] In one embodiment, the armature may have a magnetic steel portion, so that the position switching of the switch switching element 22 by the energized coil 211 can be achieved by the magnetism of the magnetic steel portion being the same as or opposite to the magnetism generated by the energized coil 211. However, this implementation method is relatively costly and requires switching control of the current direction of the energized coil 211, which also leads to a relatively complex control design. As a preferred embodiment, the driving component also includes an elastic reset member 212, which applies force to the switch switching element 22 to switch the switch switching element 22 from the open position to the closed position when the energized coil 21 is powered off or the magnetic attraction generated is insufficient to overcome the elastic force of the elastic reset member 212. The energized coil 21 can rely on the magnetic attraction to overcome the elastic force of the elastic reset member 212 when it is energized to switch the switch switching element 22 from the closed position to the open position. The elastic reset member 212 may be, for example, a coil spring.

[0036] In this technical solution, an elastic reset member 212 is provided to realize switching of the switch switching member 22 from an open position to a closed position, and the energized coil 21 is used to switch the switch switching member 22 from a closed position to an open position. In this way, there is no need to control the bidirectional current of the energized coil 21. At the same time, the switch switching member 22 does not need to use a magnetic steel part but can use a metal material that can be magnetically attracted (such as iron), thereby reducing the design cost.

[0037] In some embodiments, the armature has a limiting through hole 221 for accommodating the free end of the movable contact piece 24, and the limiting through hole 221 has a first limiting wall (not labeled in the figure) and a second limiting wall (not labeled in the figure), and the switch switching member 22 relies on the first limiting wall to abut against the first side surface of the free end of the movable contact piece 24 so that the contact head of the movable contact piece 24 contacts the normally open contact 231, and the switch switching member 22 relies on the second limiting wall to abut against the second side surface of the free end of the movable contact piece 24 so that the contact head of the movable contact piece 24 contacts the normally closed contact 232. The first side surface and the second side surface are two opposite sides of the moving contact piece 24, and the distance between the first limiting wall and the second limiting wall is greater than the thickness of the moving contact piece 24 between the first side surface and the second side surface. The difference between the aforementioned distance and thickness can be reasonably selected according to the time length that the moving contact piece 24 needs to delay disconnection. The longer the time length that needs to be delayed for disconnection, the greater the corresponding difference, and vice versa. In a specific embodiment, the time from power-on to contact action of the relay is within 0.5 to 2s, that is, the delay time is controlled within 0.5 to 2s.

[0038] In this technical solution, the disconnection time between the moving contact piece 24 and the normally closed contact 232 is adjusted by the contact timing between the first limiting wall and the second limiting wall of the limiting through hole 221 and the two side surfaces of the moving contact piece 24, and the structure is very simple.

[0039] In a specific embodiment, a bracket 4 is further provided in the assembly space, the energized coil 211 is assembled on the bracket 4, and the switch switching member 22 is hinged to the bracket 4 at a first point, and the force application point of the elastic reset member 212 on the switch switching member 22 and the force application point of the connecting rod 32 and the switch switching member 22 are respectively located on both sides of the first point.

[0040] In this technical solution, the force application point of the elastic reset member 212 on the switch switching member 22 and the force application point of the connecting rod 32 on the switch switching member 22 are respectively located on both sides of the first point, which can make the structural design compact and reasonable. The damping member 31 is fixed to the bracket 4, and / or the first end of the elastic reset member 212 is connected to the switch switching member 22, and the second end of the elastic reset member 212 is connected to the bracket 4, which can further improve the compactness of the structure.

[0041] In some embodiments, a discharge resistor 5 is further provided in the assembly space, and a first pin 61, a second pin 62, a third pin 63 and a fourth pin 64 are provided on the relay housing 1, wherein the first pin 61 is electrically connected to the first end of the energized coil 211, the second pin 62 is electrically connected to the normally open contact 231 and to the second end of the energized coil 211, the third pin 63 is electrically connected to the fixed end of the movable contact piece 24, the fourth pin 64 is electrically connected to the first end of the discharge resistor 5, and the second end of the discharge resistor 5 is electrically connected to the normally closed contact 232. The resistance of the discharge resistor 5 cannot be too small to prevent the discharge current from being too large during specific use and reducing the life of the capacitor. Generally, the resistance of the discharge resistor 5 is >100Ω. In specific use, the discharge resistor 5 is connected in series to the secondary phase branch of the secondary phase winding of the compressor.

[0042] In this technical solution, a discharge resistor is integrated in the starter relay, and various pins are provided on the relay housing 1, which can further improve the structural compactness of the relay.

[0043] According to an embodiment of the present invention, a compressor delay starting circuit is also provided. Figure 2 and Figure 3As shown, it includes the above-mentioned starting relay, starting capacitor 101, running capacitor 102, main phase winding 103 and auxiliary phase winding 104, wherein the starting capacitor 101 is connected between the third pin 63 and the fourth pin 64, the running capacitor 102 is connected between the main phase winding 103 and the second pin 62, and the first pin 61 is connected between the common phase of the main phase winding 103 and the auxiliary phase winding 104, so that the energized coil 211 in the starting relay can measure the voltage across the auxiliary phase winding 104 and control the position switching of the above-mentioned switch switching element 22 when the voltage is sufficient.

[0044] In the prior art, since the relay disconnection time is different from the compressor shutdown time, the polarity and magnitude relationship of the voltages at both ends of the starting capacitor and the running capacitor are random, resulting in the instantaneous mutual discharge of the starting capacitor and the running capacitor when they are connected in parallel, and the discharge current far exceeds the operating value of the capacitor, causing capacitor damage. In order to overcome the above-mentioned shortcomings, the starting capacitor in the prior art needs to be specially made, and a discharge resistor needs to be welded at both ends. After the start is completed, the relay is actuated to cut off the starting capacitor, and the starting capacitor passes through the discharge resistor, and the starting capacitor is connected in parallel with the running capacitor again. Since the starting capacitor needs characteristics, this method has low versatility of parts and high purchase cost. Higher, and the present invention, in the compressor system, the relay coil is connected to the motor auxiliary phase winding (that is, the aforementioned auxiliary phase winding 104), and the contact (that is, the aforementioned normally open contact 231 and normally closed contact 232) is determined to be on and off by measuring the voltage of the motor auxiliary phase winding. There are two capacitors in the system: a running capacitor 102 and a starting capacitor 101, wherein the running capacitor 102 is always connected between the compressor motor main phase winding 103 and the auxiliary phase winding 104, and the two ends of the starting relay coil (that is, the energized coil 211) are connected across the compressor motor terminals, and are connected in parallel with the running capacitor 102 during the compressor startup process ( Figure 2 As shown), the auxiliary phase winding current is increased while the main and auxiliary phase currents are enlarged, which increases the starting torque. After the compressor is started, it is disconnected from the system to achieve efficient operation of the compressor ( Figure 3 In this technical solution, a discharge resistor 5 is provided in the circuit, so that no special requirements are made for the starting capacitor 101, and ordinary compressor capacitors can be used without special production, thereby improving the versatility of parts and reducing the parts procurement cost.

[0045] The following combination Figure 2 and Figure 3 The three states of compressor starting and running are explained:

[0046] 1. In the initial state, Figure 2As shown, before the motor (i.e., the motor of the compressor) rotates at a speed lower than the rated speed, the voltage of the motor auxiliary phase winding (i.e., the aforementioned auxiliary phase winding 104, the same below) is lower than the relay action voltage, and the moving contact (i.e., the aforementioned moving contact piece 24, the same below) is connected with the normally closed contact (i.e., the aforementioned normally closed contact 232, the same below). At this time, the starting capacitor (i.e., the aforementioned starting capacitor 101, the same below) is connected in parallel with the running capacitor (i.e., the aforementioned running capacitor 102, the same below) through the line, increasing the auxiliary phase current while enlarging the main and auxiliary phase current phases, thereby realizing a high torque starting process.

[0047] 2. When the motor speed reaches the rated speed, the voltage of the motor auxiliary phase winding rises and reaches the relay action voltage. The relay is actuated, the moving contact is disconnected from the normally closed contact, and the starting capacitor is cut off from the system operation circuit. At the same time, the moving contact is closed with the normally open contact (that is, the normally open contact 231 mentioned above, the same below), and the moving contact, the discharge resistor (that is, the discharge resistor 5 mentioned above), and the starting capacitor form a circuit. The residual power of the starting capacitor is released through the discharge resistor (such as Figure 3 As shown in the figure, the existence of the discharge resistor limits the size of the discharge current, protecting the capacitor from being damaged by a large current shock; at the same time, at the moment of relay operation, the armature (that is, the aforementioned switch switching member 22, the same below) moves to drive the connecting rod (that is, the aforementioned connecting rod 32) to compress the gas in the cylinder (that is, the damping member 31), causing resistance to the movement of the moving contact. At the same time, due to the deflation effect of the small holes at the bottom of the cylinder (that is, the aforementioned air holes), the gas resistance is maintained for only a short time, which prolongs the starting time compared to no gas resistance, thereby enhancing the load starting capability of the compressor.

[0048] 3. The compressor is powered off, the relay coil loses power, the normally open contact opens, the discharge resistor is cut off from the discharge circuit, and the normally closed contact closes at the same time. The starting capacitor releases the residual power on the starting capacitor through the discharge resistor.

[0049] The present invention also provides a compressor, comprising the above-mentioned compressor delayed starting circuit.

[0050] The present invention also provides a refrigeration device, comprising the above compressor.

[0051] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A starting relay, characterized in that: The invention comprises a relay housing (1), wherein the relay housing (1) has an assembly space, wherein a driving component, a switch switching component (22), a normally open contact (231), a normally closed contact (232), and a moving contact piece (24) are arranged in the assembly space, wherein the switch switching component (22) has an open position in which a contact head of the moving contact piece (24) contacts the normally open contact (231) and a closed position in which a contact head of the moving contact piece (24) contacts the normally closed contact (232), wherein the driving component is used to drive the switch switching component (22) to switch between the open position and the closed position, and further comprises a damping component, wherein during the switching process of the switch switching component (22) from the closed position to the open position, the damping component can apply a damping force to the switch switching component (22) to delay the disconnection of the moving contact piece (24) from the normally closed contact (232).

2. The starting relay according to claim 1, characterized in that: The damping assembly comprises a damping member (31) and a connecting rod (32), wherein a first end of the connecting rod (32) is connected to the switch switching member (22), and a second end of the connecting rod (32) is inserted into a damping cavity of the damping member (31), and when the switch switching member (22) switches from the closed position to the open position, the damping cavity applies a damping force to the switch switching member (22) via the connecting rod (32).

3. The starting relay according to claim 2, characterized in that: The damping member (31) is a cylinder, the second end of the connecting rod (32) is formed as a piston inserted into the cylinder mouth of the cylinder, and a hole connecting the damping chamber with the external atmosphere is formed on the cylinder wall of the cylinder; and / or the connecting rod (32) is hinged to the switch switching member (22).

4. The starting relay according to claim 2, characterized in that: The driving component comprises an energized coil (211), and the switch member (22) is an armature.

5. The starting relay according to claim 4, characterized in that: The armature has a limiting through hole (221) for accommodating the free end of the moving contact piece (24), and the limiting through hole (221) has a first limiting wall and a second limiting wall. The switch switching member (22) relies on the first limiting wall to abut against the first side surface of the free end of the moving contact piece (24) so ​​that the contact head of the moving contact piece (24) contacts the normally open contact (231). The switch switching member (22) relies on the second limiting wall to abut against the second side surface of the free end of the moving contact piece (24) so ​​that the contact head of the moving contact piece (24) contacts the normally closed contact (232). The first side surface and the second side surface are two opposite side surfaces of the moving contact piece (24), and the distance between the first limiting wall and the second limiting wall is greater than the thickness of the moving contact piece (24) between the first side surface and the second side surface.

6. The starting relay according to claim 4, characterized in that: The driving component further comprises an elastic reset member (212), wherein the elastic reset member (212) applies force to the switch switching member (22) so as to switch the switch switching member (22) from the disconnected position to the closed position when the energized coil (21) is disconnected from the power supply or when the magnetic attraction force generated is insufficient to overcome the elastic force of the elastic reset member (212). When the energized coil (21) is energized, the energized coil (21) can overcome the elastic force of the elastic reset member (212) by the magnetic attraction force to switch the switch switching member (22) from the closed position to the disconnected position.

7. The starting relay according to claim 6, characterized in that: A bracket (4) is also provided in the assembly space, the energized coil (211) is assembled on the bracket (4), and the switch switching member (22) and the bracket (4) are hinged at a first point, and the force application point of the elastic reset member (212) on the switch switching member (22) and the force application point of the connecting rod (32) and the switch switching member (22) are respectively located on both sides of the first point; and / or the elastic reset member (212) is a coil spring.

8. The starting relay according to claim 4, characterized in that: A discharge resistor (5) is also provided in the assembly space, and a first pin (61), a second pin (62), a third pin (63) and a fourth pin (64) are provided on the relay housing (1), wherein the first pin (61) is electrically connected to the first end of the energized coil (211), the second pin (62) is electrically connected to the normally open contact (231) and to the second end of the energized coil (211), the third pin (63) is electrically connected to the fixed end of the movable contact piece (24), the fourth pin (64) is electrically connected to the first end of the discharge resistor (5), and the second end of the discharge resistor (5) is electrically connected to the normally closed contact (232).

9. A compressor delayed start circuit, characterized in that: The invention comprises the starting relay according to claim 8, a starting capacitor (101), a running capacitor (102), a main phase winding (103) and a secondary phase winding (104), wherein the starting capacitor (101) is connected between the third pin (63) and the fourth pin (64), the running capacitor (102) is connected between the main phase winding (103) and the second pin (62), and the first pin (61) is connected between the common phase of the main phase winding (103) and the secondary phase winding (104).

10. A compressor, characterized in that: It includes the compressor delayed start circuit as described in claim 9.

11. A refrigeration device, characterized in that: Comprising the compressor as claimed in claim 10.

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