Exhaust valve assembly, compressor and refrigeration equipment

Abstract

The present invention relates to the field of household appliance technology, and specifically to an exhaust valve assembly, a compressor and a refrigeration device. The exhaust valve assembly provided by the embodiment of the present invention includes a valve seat, a valve plate and an auxiliary opening and closing mechanism; the auxiliary opening and closing mechanism can provide an auxiliary force for the free end of the valve plate directed from the exhaust port to the free end, and the auxiliary opening and closing mechanism can offset the elastic force of the valve plate for the auxiliary force of the free end of the valve plate, and the elastic force of the valve plate does not need to be overcome when the compression chamber is exhausted, thereby reducing the pressure in the compression chamber during exhaust, reducing compression loss, and improving energy efficiency; in addition, when the compression chamber needs to change volume, the auxiliary force applied by the auxiliary opening and closing mechanism drives the free end of the valve plate to open the exhaust port, the compression chamber is connected to the shell, the volume chamber cannot complete the compression process, and the volume change is realized. The compressor can be changed without introducing pressure, which can improve the energy efficiency of the compressor.

Description

Technical Field

[0001] The invention relates to the technical field of household appliances, and in particular to an exhaust valve component, a compressor and a refrigeration device. Background Art

[0002] Traditional piston compression chambers generally use a control valve bypass structure to achieve variable capacity. The structure is relatively complex. The pressure is introduced by adjusting the control valve to achieve internal and external communication of the piston compression chamber to achieve variable capacity. However, the variable capacity high pressure is usually the pressure after compression or the intermediate pressure after compression. This part of the gas does not participate in the refrigeration cycle, affecting the energy efficiency of the compressor. Summary of the invention

[0003] (I) The technical problem to be solved by the present invention is that: currently, when changing the capacity of a piston compressor, a bypass pressure needs to be introduced. The introduced bypass pressure is the high pressure or intermediate pressure after compression. This part of the pressure does not participate in the refrigeration cycle, which affects the energy efficiency of the compressor.

[0004] (II) Technical solution

[0005] In order to solve the above technical problems, an embodiment of the present invention provides an exhaust valve assembly on one hand, wherein the exhaust valve assembly includes a valve seat, a valve plate and an auxiliary opening and closing mechanism, wherein the valve seat is provided with an exhaust port, the valve plate has a free end and a fixed end, the fixed end is fixed on the valve seat, and the free end covers the exhaust port; the auxiliary opening and closing mechanism is used to apply an auxiliary force to the free end, and the direction of the auxiliary force is from the exhaust port to the free end.

[0006] According to an embodiment of the present invention, the auxiliary opening and closing mechanism includes an electromagnetic device, and the electromagnetic device is arranged corresponding to the free end to provide a magnetic attraction force to the free end.

[0007] According to an embodiment of the present invention, a magnetic member is provided on the free end.

[0008] According to an embodiment of the present invention, the free end is made of ferromagnetic material.

[0009] According to an embodiment of the present invention, a groove is provided on the valve seat, the exhaust port is opened in the groove, the fixed end is fixed in the groove, and the free end covers the exhaust port.

[0010] According to an embodiment of the present invention, the electromagnetic device comprises an electromagnet, a part of which is fixed on the valve seat, and another part of which is located outside the groove corresponding to the position of the free end.

[0011] According to an embodiment of the present invention, the exhaust valve assembly further comprises a baffle plate fitted with the valve plate, and the valve plate is located between the baffle plate and the valve seat.

[0012] According to an embodiment of the present invention, the auxiliary opening and closing mechanism includes a driving member and a limiting member, the limiting member includes a first rod portion and a second rod portion connected to each other, and the cross-sectional size of the first rod portion is greater than the cross-sectional size of the second rod portion;

[0013] A limiting hole is provided on the valve seat, the central axis of the limiting hole is located at the lower side of the valve plate, the driving member is connected to one end of the first rod portion, the other end of the first rod portion is connected to one end of the second rod portion, the other end of the second rod portion is inserted into the limiting hole, and the driving member is used to drive the limiting member to move along the limiting hole at the lower side of the valve plate;

[0014] When the second rod portion moves to the lower side of the valve plate, a gap is formed between the second rod portion and the valve plate;

[0015] When the first rod portion moves to the lower side of the valve plate, the first rod portion is in contact with the valve plate to apply the auxiliary force to the valve plate.

[0016] According to an embodiment of the present invention, the first rod portion and the second rod portion are both cylindrical structures, and the first rod portion is connected to the second rod portion via a connecting portion, and the outer diameter of the connecting portion gradually decreases from one end of the first rod portion to one end of the second rod portion.

[0017] According to one embodiment of the present invention, the limiting hole is a blind hole opened on the valve seat, and the auxiliary opening and closing mechanism also includes an elastic member, one end of the elastic member abuts against the bottom wall of the limiting hole, and the other end abuts against an end of the second rod portion away from the first rod portion.

[0018] According to an embodiment of the present invention, the driving member is an electromagnetic device, the limiting member is provided with a magnetic member, and the electromagnetic device provides a magnetic repulsion force for the limiting member to push the limiting member to move in the limiting hole.

[0019] According to an embodiment of the present invention, the valve seat is an electromagnet, a part of the electromagnet is fixed on the valve seat, and another part of the electromagnet corresponds to the position of the limiting hole.

[0020] According to one embodiment of the present invention, the aperture of the limiting hole is D1, the distance between the central axis of the limiting hole and the top of the exhaust port is H, the diameter of the second rod portion is D2, and the diameter of the first rod portion is D3; H>D2 / 2, H<D3 / 2, D2<D3.

[0021] According to one embodiment of the present invention, a groove is provided on the valve seat, the exhaust port is opened in the groove, the fixed end is fixed in the groove, and the free end covers the exhaust port; the limiting hole passes through two opposite side walls of the groove.

[0022] Another aspect of the present invention provides a compressor, comprising the exhaust valve assembly described in any one of the above embodiments.

[0023] According to another aspect of the present invention, there is provided a refrigeration device, comprising the compressor as described in the above embodiment.

[0024] Beneficial effects of the present invention: The exhaust valve assembly provided by the embodiment of the present invention includes a valve seat, a valve plate and an auxiliary opening and closing mechanism; when the compression chamber needs to change its volume, the auxiliary force applied by the auxiliary opening and closing mechanism drives the free end of the valve plate to open the exhaust port, and the compression chamber is connected to the shell, and the compression process cannot be completed, thereby realizing the compressor volume change. The compressor volume change can be realized without introducing pressure, and the energy efficiency of the compressor can be improved; in addition, the auxiliary opening and closing mechanism can provide an auxiliary force for the free end of the valve plate directed from the exhaust port to the free end, and the auxiliary opening and closing mechanism can offset the elastic force of the valve plate for the auxiliary force of the free end of the valve plate. When the compression chamber is exhausted, it is not necessary to overcome the elastic force of the valve plate, thereby reducing the pressure in the compression chamber during exhaust, reducing compression loss, and improving energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The advantages of the above and / or additional aspects of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is an exploded view of the exhaust valve assembly in the second embodiment;

[0027] Figure 2 is a cross-sectional view of an exhaust valve assembly in one state in the second embodiment;

[0028] Figure 3 is a cross-sectional view of the exhaust valve assembly in another state in the second embodiment;

[0029] Figure 4 is an assembly diagram of the exhaust valve assembly in Embodiment 3;

[0030] Figure 5 is an exploded view of the exhaust valve assembly in Embodiment 3;

[0031] Figure 6 is a cross-sectional view of the exhaust valve assembly in Embodiment 3;

[0032] Figure 7 yes Figure 6 AA section view of one state;

[0033] Figure 8 yes Figure 6 AA section view in another state;

[0034] Fig. 9 is a schematic diagram of the structure of the limiter in the third embodiment;

[0035] Fig.10 It is a schematic diagram of the structure of the compressor in the fourth embodiment.

[0036] in Figures 1 to 10 The corresponding relationship between the reference numerals and the component names is as follows:

[0037] 1. Exhaust valve assembly, 11. Valve seat, 111. Groove, 112. Exhaust port, 113. Fastening threaded hole, 114. Valve plate screw, 115. Fastening screw, 116. Limiting hole, 12. Valve plate, 13. Baffle, 14. Electromagnetic device, 15. Spring, 16. Limiting member, 161. First rod portion, 162. Second rod portion, 163. Connecting portion, 17. Washer, 18. Magnetic member, 2. Compressor, 21. Housing, 22. External power supply. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0039] Embodiment 1

[0040] like Figures 1 to 10 As shown, this embodiment provides an exhaust valve assembly 1, which includes a valve seat 11, a valve plate 12 and an auxiliary opening and closing mechanism, wherein the valve seat 11 is provided with an exhaust port 112, the valve plate 12 has a free end and a fixed end, the fixed end is fixed on the valve seat 11, and the free end covers the exhaust port 112; the auxiliary opening and closing mechanism is used to apply an auxiliary force to the free end, and the direction of the auxiliary force is from the exhaust port 112 to the free end.

[0041] like Figure 1 and Figure 5 As shown, the auxiliary opening and closing mechanism provided in this embodiment includes a valve seat 11, a valve plate 12 and an auxiliary opening and closing mechanism. The auxiliary opening and closing mechanism can provide an auxiliary force for the free end of the valve plate 12 directed from the exhaust port 112 to the free end. When the compression chamber needs to change capacity, the auxiliary force applied by the auxiliary opening and closing mechanism drives the free end of the valve plate 12 to open the exhaust port 112, and the compression chamber is connected to the shell 21. The corresponding compression chamber cannot complete the compression process, and the capacity change is realized. The compressor 2 can be changed without introducing pressure, which can improve the energy efficiency of the compressor 2.

[0042] The exhaust valve assembly of the existing compressor generally includes a baffle 13, a valve plate 12 and a valve plate screw. The exhaust valve assembly is fixed to the exhaust port 112 by riveting or screwing. When the pressure in the compression chamber is greater than the combined force of the back pressure of the valve plate 12 and the spring valve plate elastic force, the valve plate will open. At this time, a slight over-compression phenomenon has occurred in the compression chamber, increasing the indicated work of the compressor.

[0043] In the present embodiment, when the compression chamber is exhausted, the auxiliary opening and closing mechanism can use the auxiliary force of the free end of the valve plate 12 to offset the elastic force of the valve plate 12, and the free end of the valve plate 12 is pushed by the pressure of the compression chamber to open the exhaust port 112. When the compression chamber is exhausted, there is no need to overcome the elastic force of the valve plate 12, which can reduce the pressure in the compression chamber during exhaust, reduce compression loss, and improve energy efficiency.

[0044] Embodiment 2

[0045] like Figures 1 to 3 As shown, the exhaust valve assembly 1 provided in this embodiment includes a valve seat 11, a valve plate 12 and an auxiliary opening and closing mechanism, wherein the valve seat 11 is provided with an exhaust port 112, and the valve plate 12 has a free end and a fixed end, wherein the fixed end is fixed on the valve seat 11, and the free end covers the exhaust port 112. The auxiliary opening and closing mechanism includes an electromagnetic device 14, which is arranged corresponding to the free end to provide a magnetic attraction force to the free end, and overcomes the elastic force of the valve plate 12 through the magnetic attraction force, but does not adsorb the free end of the valve plate 12 to open the exhaust port 112. At this time, the compression chamber does not need to overcome the elastic force of the valve plate 12 during exhaust, which can reduce the pressure in the compression chamber during exhaust, reduce compression loss, and improve energy efficiency.

[0046] When the compressor 2 is performing capacity change, the electromagnetic device 14 provides a stronger suction force to the free end of the valve plate 12, and opens the exhaust port 112 at the free end of the valve plate 12. At this time, the compression chamber is connected with the shell 21 of the compressor 2. Due to the connection between the compression chamber and the shell, there is no pressure difference between the two. Therefore, when the piston reciprocates in the compression chamber, the suction valve plate will not open, and low-pressure gas will not be sucked into the compression chamber. At this time, the piston in the compression chamber is reciprocating, but there is no suction compression and exhaust process, that is, this compression chamber does not work, thereby achieving the capacity change function.

[0047] In the present application, an electromagnetic device 14 is arranged on the back pressure side of the valve plate 12 , and power is supplied to the electromagnetic device 14 through an external power source 22 through a housing 21 of the compressor 2 .

[0048] like Figure 1As shown, the electromagnetic device 14 includes an electromagnet and a valve seat 11, and a part of the electromagnet is fixed to the valve seat 11 by a fastening screw 115; wherein a fastening threaded hole 113 is opened on the valve seat 11, and the electromagnet is fixed to the valve seat 11 by the cooperation of the screw and the fastening threaded hole 113; the other part of the electromagnet is located on the outside of the groove 111 corresponding to the position of the free end; the electromagnet controls the magnetic field strength generated by the electromagnetic device 14 by controlling the current intensity or voltage intensity, thereby affecting the magnetic pulling force generated by the electromagnetic device 14 on the valve plate 12, thereby controlling the opening of the valve plate 12.

[0049] The electromagnetic device 14 needs to be arranged on the back pressure side of the valve plate 12 and close to the head of the valve plate 12 ; it can be fixed on the side of the baffle 13 away from the valve plate 12 , or fixed at other positions close to the head of the valve plate 12 .

[0050] According to an embodiment of the present invention, the free end of the valve plate 12 is made of ferromagnetic material, so that after the electromagnet is energized to generate a magnetic field, a magnetic attraction force can be generated on the free end of the valve plate 12, and the magnitude of the magnetic attraction force on the free end of the valve plate 12 is controlled by the strength of the current energized to the electromagnet. Due to manufacturing requirements, the entire valve plate 12 is made of ferromagnetic material, so that the valve plate 12 is manufactured in one piece, saving the subsequent process of connecting the free end and the fixed end, making the manufacturing simpler, the production efficiency higher, and the structural strength better.

[0051] According to another embodiment of the present invention, a magnetic member 18 is provided on the valve plate 12 , so that the electromagnet can generate a magnetic attraction force on the magnetic member 18 when energized. Since the magnetic member 18 is fixed to the free end of the valve plate 12 , a magnetic attraction force can be generated on the free end of the valve plate 12 .

[0052] like Figures 1 to 3 As shown, a groove 111 is provided on the valve seat 11, the exhaust port 112 is opened in the groove 111, the fixed end is fixed in the groove 111 by a valve plate screw 114, and the free end covers the exhaust port 112; the valve plate 12 is installed in the groove 111, and the position of the valve plate 12 will not move laterally. The setting of the groove 111 can play a certain positioning and limiting role on the valve plate 12.

[0053] like Figures 1 to 3 As shown, the electromagnetic device 14 includes an electromagnet, a part of which is fixed to the valve seat 11 by a fastening screw 115, and the other part is located outside the groove 111 at a position corresponding to the free end. A part of the electromagnet is located above the free end of the valve disc 12, the relative distance between the valve disc 12 and the electromagnet is reduced, and the magnetic pulling force is enhanced, which is conducive to the stability of the opening angle of the valve disc 12, thereby reducing the flutter of the valve disc 12 and improving the reliability of the opening and closing of the valve disc 12.

[0054] like Figures 1 to 3 As shown, the solenoid valve assembly further includes a baffle 13, the valve plate 12 and the baffle 13 are stacked, and the valve plate 12 is located between the baffle 13 and the valve seat 11, and the baffle 13 can limit and block the opening angle of the valve plate 12.

[0055] like Figure 2 As shown, when the compression chamber is working, the electromagnet is powered at the same time, the electromagnet generates a magnetic field, and the power supply intensity is controlled so that the magnetic pulling force at the head of the valve plate 12 is just or slightly smaller than the elastic force of the valve plate 12 spring. At this time, after the pressure in the compression chamber reaches the exhaust pressure, the valve plate 12 opens, and the over-compression phenomenon is weakened, which is beneficial to reduce over-compression losses and improve energy efficiency.

[0056] like Figure 3 As shown, when the compression chamber needs to achieve variable capacity, especially for the piston-type compression chamber, the entire pump body is provided with an intake valve plate 12 and an exhaust valve plate 12. The intake valve plate 12 opens toward the inside of the compression chamber, and the exhaust valve plate 12 opens toward the outside of the compression chamber. An electromagnetic device 14 is provided on the upper part of the baffle plate 13 on the back pressure side of the exhaust valve plate 12. When variable capacity is required, the magnetic field strength of the electromagnetic device 14 is adjusted so that the magnetic pulling force of the valve plate 12 head is greater than the spring force of the valve plate 12, and the exhaust valve plate 12 is directly pulled up, deformed, and directly close to the baffle plate 13, and the compression chamber is directly connected to the shell 21; at the same time, the magnetic pulling force of the intake valve plate 12 increases, resulting in an increase in the closing force of the intake valve plate 12, an increase in the difficulty of opening, and no low-pressure gas is sucked into the compression chamber; at this time, it is equivalent to the piston of the piston-type compression chamber having reciprocating motion, but there is no intake, compression, and exhaust process, that is, this compression chamber does not work, thereby achieving the variable capacity function.

[0057] Embodiment 3

[0058] like Figures 4 to 9As shown, this embodiment provides an exhaust valve assembly 1, the exhaust valve assembly 1 includes a valve seat 11, a valve plate 12 and an auxiliary opening and closing mechanism; the auxiliary opening and closing mechanism includes a driving member and a limiting member 16, the limiting member 16 includes a first rod portion 161 and a second rod portion 162 connected to each other, the cross-sectional size of the first rod portion 161 is greater than the cross-sectional size of the second rod portion 162; the valve seat 11 is provided with a limiting hole 116, the driving member is connected to one end of the first rod portion 161, and the other end of the first rod portion 161 is connected to the The second rod portion 162 is connected, and the other end of the second rod portion 162 is inserted into the limiting hole 116, and the driving member is used to drive the limiting member 16 to move along the limiting hole 116 on the lower side of the valve plate 12; when the second rod portion 162 moves to the lower side of the valve plate 12, a gap is formed between the second rod portion 162 and the valve plate 12; when the first rod portion 161 moves to the lower side of the valve plate 12, the first rod portion 161 is connected to the valve plate 12 to apply the auxiliary force to the valve plate 12.

[0059] The exhaust valve assembly 1 provided in this embodiment is as follows: Figure 7 As shown, when the valve plate 12 is in normal working state, the driving member drives the first rod portion 161 of the limiting member 16 to be located at the lower side of the valve plate 12. At this time, since a gap is formed between the first rod portion 161 and the valve plate 12, no force is applied to the valve plate 12. When the capacity needs to be changed, as shown in FIG. Figure 8 As shown, the driving member drives the second rod portion 162 of the limit member 16 to be located at the lower side of the valve plate 12. At this time, the second rod portion 162 contacts the valve plate 12, and applies an auxiliary force to the valve plate 12. The auxiliary force is directed from the exhaust port 112 to the free end, and the valve plate 12 is assisted to open the exhaust port 112. At this time, the valve plate 12 is in an open state, and the compression chamber of the compressor 2 is connected with the shell 21. Due to the connection between the compression chamber and the shell 21, there is no pressure difference between the two. Therefore, when the piston reciprocates in the compression chamber, the suction valve plate will not open, and low-pressure gas will not be sucked into the compression chamber. At this time, the piston in the compression chamber is reciprocating, but there is no suction, compression and exhaust process. The volume chamber provided with the exhaust valve plate does not work, and variable capacity is achieved. The compressor 2 can be variable in capacity without introducing pressure, which can improve the energy efficiency of the compressor 2.

[0060] like Fig. 9As shown, the first rod portion 161 and the second rod portion 162 are both cylindrical structures, and the first rod portion 161 is connected to the second rod portion 162 through a connecting portion 163, and the outer diameter of the connecting portion 163 gradually decreases from one end of the first rod portion 161 to one end of the second rod portion 162, so that when the driving member drives the limiting member 16 to move in the limiting hole 116, the transition from the second rod portion 162 to the first rod portion 161 is carried out through the connecting portion 163, and the connection between the first rod portion 161 and the second rod portion 162 will not be stuck by the edge of the exhaust port 112, resulting in the limit member 16 being unable to move.

[0061] like Figure 7 and Figure 8 As shown, the limiting hole 116 is a blind hole opened on the valve seat 11, and the auxiliary opening and closing mechanism also includes an elastic member 15, one end of the elastic member 15 abuts against the bottom wall of the limiting hole 116, and the other end abuts against one end of the second rod portion 162 away from the first rod portion 161. During normal operation, the valve plate 12 provides an elastic force for the limiting member 16, so that the limiting member 16 is squeezed toward the outside of the limiting hole 116, so that the first rod portion 161 is located at the lower side of the valve plate 12, ensuring that the valve plate 12 is in a normally closed state; preferably, the elastic member 15 is a spring.

[0062] like Figures 4 to 9 As shown, the driving member is an electromagnetic device 14, and a magnetic member 18 is provided on the limit member 16. The electromagnetic device 14 provides a magnetic repulsion force for the limit member 16 to push the limit member 16 to move in the limit hole 116: the electromagnetic device 14 includes an electromagnet, and a magnetic member 18 is provided on the limit member 16. The electromagnetic device 14 provides a magnetic repulsion force for the limit member 16 to push the limit member 16 to move in the limit hole 116. A fastening threaded hole 113 is provided on the valve seat 11, and a part of the electromagnet is fixed to the valve seat 11 by the cooperation of a fastening screw 115 and the fastening threaded hole 113. A gasket 17 is provided between the electromagnet and the valve seat 11, and the gasket 17 can play a role in shock absorption and fastening connection. When the valve plate 12 is in normal working state, the electromagnet is powered off and the compressor 2 is working normally; when the capacity is changed, the electromagnet is powered on to provide a magnetic repulsion force for the limiter 16, pushing the limiter 16 into the limit hole 116. At this time, the second rod 162 is located at the lower side of the valve plate 12 to lift the valve plate 12. At this time, the free end of the valve plate 12 is in a normally open state, and the compression chamber of the compressor 2 is connected to the shell 21. The corresponding volume chamber cannot complete the compression process, that is, the volume chamber does not work, and the capacity is changed. The compressor 2 can be changed without introducing pressure, which can improve the energy efficiency of the compressor 2. The function of the driving member is to push the limiter 16 to move in the pin hole, so the driving member can also adopt other mechanisms: such as a cylinder or a hydraulic cylinder.

[0063] In this embodiment, the aperture of the limiting hole 116 is D1, the distance between the central axis of the limiting hole 116 and the top of the exhaust port 112 is H, the diameter of the second rod portion 162 is D2, and the diameter of the first rod portion 161 is D3; in order to ensure that the first rod portion 161 is located at the lower side of the valve plate 12 and does not contact the valve plate 12, H>D2 / 2; in order to ensure that the second rod portion 162 is located at the lower side of the valve plate 12 and can push the valve plate 12 to open the exhaust port 112, H<D3 / 2 is required at this time, and at the same time, the diameter of the second rod portion 162 is smaller than the diameter of the first rod portion 161 D2<D3, D1 and D3 are matched, that is, the diameter of the first rod portion 161 is equal to or slightly smaller than the inner diameter of the limiting hole 116.

[0064] like Figure 4 and Figure 5 As shown, a groove 111 is provided on the valve seat 11 , the exhaust port 112 is opened in the groove 111 , the fixed end is fixed in the groove 111 , and the free end covers the exhaust port 112 ; the limiting hole 116 passes through two opposite side walls of the groove 111 .

[0065] The working principle of the exhaust valve assembly 1 provided in this embodiment is as follows:

[0066] When compressor 2 is operating normally, Figure 7 As shown, the electromagnet of the electromagnetic device 14 is powered off, and the electromagnet does not generate a magnetic repulsion force on the magnetic part 18 on the limit member 16. At this time, the spring that is against the second rod portion 162 provides elastic force for the limit member 16, and the spring pushes the limit member 16 toward the entrance of the limit hole 116. The second rod portion 162 is located at the lower end of the valve plate 12. Since H>D2 / 2, the first rod portion 161 does not contact the valve plate 12. At this time, the valve plate 12 works normally, and the compression chamber normally inhales, compresses, and exhausts air.

[0067] When compressor 2 needs to change capacity, such as Figure 8 As shown, the electromagnet generates a magnetic field when it is energized, and generates a magnetic repulsion force for the magnetic part 18 on the limit member 16. The magnetic part 18 is a magnet. The electromagnet generates a magnetic field that repels the magnet, pushing the limit member 16 to move in the direction of the spring, overcoming the spring force. At this time, the first rod portion 161 of the cross section is located at the lower side of the valve plate 12 and contacts the valve plate 12. Since H is less than D3 / 2, the second rod portion 162 lifts the valve plate 12 and is close to the baffle 13. At this time, the valve plate 12 is in a normally open state, and the piston compression chamber is connected inside and outside. The volume chamber cannot complete the compression process, that is, the volume chamber does not work, thereby achieving variable capacity.

[0068] Embodiment 4

[0069] The present embodiment provides a compressor 2, which is a piston compressor. The piston compressor uses the exhaust valve assembly 1 described in any one of the above-mentioned embodiments 1, 2 or 3. Therefore, when the compression chamber is exhausted, it is not necessary to overcome the elastic force of the valve plate 12, thereby reducing the pressure in the compression chamber during exhaust, reducing compression losses, and improving energy efficiency. In addition, when the compression chamber needs to change its volume, the auxiliary force applied by the auxiliary opening and closing mechanism drives the free end of the valve plate 12 to open the exhaust port 112, and the compression chamber is connected to the shell 21. The volume chamber cannot complete the compression process, thereby realizing volume change. The compressor 2 can be changed in volume without introducing pressure, which can improve the energy efficiency of the compressor 2.

[0070] Embodiment 5

[0071] The refrigeration device provided in this embodiment adopts the compressor 2 described in the fourth embodiment. Since the compressor 2 has higher energy efficiency, the energy efficiency of the entire refrigeration device is higher, which can save energy and cost.

[0072] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0074] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An exhaust valve assembly, characterized in that: The exhaust valve assembly comprises a valve seat, a valve plate and an auxiliary opening and closing mechanism, wherein the valve seat is provided with an exhaust port, and the exhaust port is used to connect the compression chamber of the compressor and the housing; the valve plate has a free end and a fixed end, the fixed end is fixed on the valve seat, and the free end covers the exhaust port; The auxiliary opening and closing mechanism is used to apply an auxiliary force to the free end, the direction of the auxiliary force is from the exhaust port to the free end, and is used to drive the free end to open the exhaust port; The auxiliary opening and closing mechanism comprises a driving member, a limiting member and an elastic member, wherein the limiting member comprises a first rod portion and a second rod portion connected to each other, and the cross-sectional dimension of the first rod portion is greater than the cross-sectional dimension of the second rod portion; A limiting hole is provided on the valve seat, the central axis of the limiting hole is located at the lower side of the valve plate, the limiting hole is a blind hole opened on the valve seat, one end of the elastic member abuts against the bottom wall of the limiting hole, and the other end abuts against an end of the second rod portion away from the first rod portion; The driving member is an electromagnetic device, and a magnetic member is provided on one end of the first rod portion. The electromagnetic device provides a magnetic repulsion force for the limiting member to push the limiting member to move in the limiting hole; the other end of the first rod portion is connected to one end of the second rod portion, and the other end of the second rod portion is inserted into the limiting hole. The driving member is used to drive the limiting member to move along the limiting hole on the lower side of the valve plate; When the second rod portion moves to the lower side of the valve plate, a gap is formed between the second rod portion and the valve plate; When the first rod portion moves to the lower side of the valve plate, the first rod portion is in contact with the valve plate to apply the auxiliary force to the valve plate.

2. The exhaust valve assembly according to claim 1, characterized in that: The exhaust valve assembly further comprises a baffle plate fitted with the valve plate, and the valve plate is located between the baffle plate and the valve seat.

3. The exhaust valve assembly according to claim 1, characterized in that: The first rod portion and the second rod portion are both cylindrical structures. The first rod portion is connected to the second rod portion via a connecting portion. The outer diameter of the connecting portion gradually decreases from one end of the first rod portion to one end of the second rod portion.

4. The exhaust valve assembly according to claim 1, characterized in that: The electromagnetic device comprises an electromagnet, a part of which is fixed on the valve seat, and another part of which corresponds to the position of the limiting hole.

5. The exhaust valve assembly according to claim 1, characterized in that: The aperture of the limiting hole is D1, the distance between the central axis of the limiting hole and the top of the exhaust port is H, the diameter of the second rod portion is D2, and the diameter of the first rod portion is D3; H>D2 / 2, H<D3 / 2, D2<D3.

6. The exhaust valve assembly according to claim 1, characterized in that: The valve seat is provided with a groove, the exhaust port is opened in the groove, the fixed end is fixed in the groove, and the free end covers the exhaust port; the limiting hole passes through two opposite side walls of the groove.

7. A compressor, characterized in that: Comprising the exhaust valve assembly according to any one of claims 1 to 6.

8. A refrigeration device, characterized in that: Comprising the compressor of claim 7.

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