An exhaust check structure, pump assembly and compressor

Abstract

The present invention provides an exhaust check structure, a pump body assembly and a compressor, which relate to the technical field of compressors, and solve the technical problem that when a valve plate is acted upon by gas force, it will quickly rise or fall to the limiting structure on the valve seat and impact with it, which affects the life of the valve plate and generates noise. The exhaust check structure includes a valve seat, a valve plate, an adjusting member, and an impeller; the valve seat is arranged outside the exhaust port of a stationary vortex disk; the valve plate is movably arranged on the top of the valve seat; an adjusting screw hole is arranged on the top of the valve seat, which is respectively connected to the valve cavity and the external environment; the adjusting member is screwed into the adjusting screw hole; the top of the adjusting member is connected to the valve plate, and the bottom of the adjusting member is connected to the impeller located in the valve cavity. The axial movement speed of the valve plate of the present invention can be controlled by the relevant parameters of the thread set on the adjusting member, so that the movement of the valve plate is smooth and controllable, the impact force between the valve plate and the valve seat is reduced, the service life of the exhaust check structure is ensured, and the noise generated by the valve plate impacting the valve seat is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an exhaust check structure, a pump body component and a compressor. Background Art

[0002] A scroll compressor is a fluid machine that achieves gas compression by changing the volume. When the compressor is working, the gas enters the compression chamber formed by the meshing of the scroll teeth of the moving and stationary scrolls from the air intake port on the periphery of the stationary scroll. Under the movement of the moving scroll, the volume of the compression chamber gradually decreases, and the gas in the chamber is gradually compressed into the exhaust chamber in the center and discharged from the exhaust port of the stationary scroll. However, in the actual operation process, whenever the exhaust chamber is connected to the exhaust port of the stationary scroll, it may happen that the gas pressure in the exhaust chamber will be less than the exhaust pressure at the beginning, and the volume of the exhaust chamber needs to be further reduced to reach the exhaust pressure. At this time, the gas pressure outside the exhaust port of the stationary scroll is greater than the pressure in the exhaust chamber, and it may flow back to the exhaust chamber to cause repeated compression. Another situation is that when the compressor is stopped, the crankshaft connected to the moving scroll does not have a motor to provide unidirectional rotation power. Since the gas pressure outside the exhaust port of the stationary scroll is greater than the gas pressure in the compression chamber, the gas will flow back to the compression chamber through the exhaust chamber, causing the moving scroll to reverse rapidly, bringing the risk of damaging the compressor.

[0003] A common method to prevent gas from flowing back into the exhaust chamber is to set an exhaust check structure at the exhaust port of the fixed scroll. When the gas flows from the exhaust chamber to the outside of the exhaust port of the fixed scroll, the exhaust check structure opens and the gas can pass through; when the gas flows back from the outside of the exhaust port of the fixed scroll back to the exhaust chamber, the exhaust check structure closes to prevent the gas from continuing to pass through.

[0004] The applicant has found that the prior art has at least the following technical problems:

[0005] like Figure 1As shown, an exhaust valve assembly, a scroll compressor and a refrigeration device are disclosed in the prior art. Among them, the exhaust valve assembly includes: a first valve seat 11, which is used to be installed on the exhaust side of the fixed scroll 21 of the scroll compressor, and the first valve seat 11 has a first valve cavity 111 opposite to the exhaust hole 211 of the fixed scroll 21; and a first valve plate 12, which can be arranged in the first valve cavity 111 in an axial direction of the exhaust hole 211 and float up and down to connect or isolate the exhaust hole 211 from the first valve cavity 111. This form of exhaust check structure is relatively common, which is a pressure difference floating type. When the pressure in the exhaust cavity is greater than the external pressure of the exhaust hole of the fixed scroll, the gas will blow up the first valve plate, which will not affect the normal operation of the compressor; and when the pressure in the exhaust cavity is less than the external pressure of the exhaust hole of the fixed scroll, the gas will press down the first valve plate, thereby covering the exhaust hole of the fixed scroll and preventing the gas from continuing to flow back. However, this type of exhaust check structure also has certain problems. The most common one is that in order to ensure floating, the first valve plate is generally designed to be relatively light and thin. Therefore, when subjected to the force of gas, it will quickly rise or fall to the limiting structure on the first valve seat and collide with it, which will affect the life of the first valve plate and also generate noise.

[0006] Similarly, a buffer valve plate assembly and a compressor are also disclosed in the prior art, such as Figure 2 As shown, the buffer valve plate 6 includes: a second valve plate 62 fixed to the exhaust valve seat and a baffle plate 61 stacked on the second valve plate 62; a connecting portion, a middle portion that can be bent based on the connecting portion, and a sealing portion are formed between the two ends of the second valve plate 62 in sequence; a connecting portion 611, a middle portion, and an upwardly tilted limiting portion 612 are formed between the two ends of the baffle plate 61 in sequence, and at least one protrusion 613 protruding toward the second valve plate is provided on one side of the middle portion close to the limiting portion 612. This type of exhaust check structure is also relatively common, using gas force to cause the second valve plate to warp and deform, thereby opening the exhaust channel; when the gas wants to flow back to the exhaust chamber, the deformation recovery of the second valve plate is used to close the exhaust channel in time. However, in this type of exhaust check structure, the deformation degree of the second valve plate cannot be too large, otherwise it is easy to cause plastic deformation or even fatigue fracture after a long period of work. Therefore, the opening angle of the second valve plate of this type is generally small, which limits the exhaust flow rate. Summary of the invention

[0007] The object of the present invention is to provide an exhaust check structure, a pump body assembly and a compressor to solve the technical problem in the prior art that when the valve plate is acted upon by gas force, it will quickly rise or fall to the limiting structure on the valve seat and collide with it, thereby affecting the life of the valve plate and generating noise.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides an exhaust check structure, comprising a valve seat, a valve plate, an adjusting member, and an impeller; wherein:

[0010] The valve seat is arranged outside the exhaust port of the fixed scroll disk, and an air flow channel is provided inside the valve seat, and the space enclosed by the channel is a valve cavity;

[0011] The valve plate is movably arranged on the top of the valve seat, located at an end of the valve cavity away from the exhaust port, and can connect or close the exhaust port to the external environment for exhaust or exhaust check;

[0012] The regulating member is screwed onto the crossbeam in the valve cavity;

[0013] The top of the regulating member is connected to the valve plate, and the bottom is connected to the impeller located in the valve cavity.

[0014] The exhaust check structure provided by the present invention includes a valve seat, a valve plate, an adjusting member, and an impeller. A gas channel is provided in the valve seat, and the space enclosed by the channel is a valve cavity. One end of the valve cavity is connected to the exhaust port of the static vortex disk, and the other end is connected to the external exhaust space of the static vortex disk. The valve plate is located on the side where the valve cavity is connected to the external exhaust space of the static vortex disk, and can move axially along the valve cavity. When it abuts against the outer end surface of the valve seat, it can block the exhaust port and the external exhaust space. When it is away from the outer end surface of the valve seat, the exhaust port is connected to the external exhaust space. The valve plate is connected to the adjusting member, and the adjusting member is connected to the impeller. The adjusting member is connected to the adjusting screw hole on the valve seat through the matching connection, so that the rotational motion of the impeller caused by the airflow is converted into the axial motion of the valve plate. Therefore, the axial motion speed of the valve plate can be controlled by the relevant parameters of the thread set on the adjusting member, so that the movement of the valve plate is smooth and controllable, the impact force between the valve plate and the valve seat is reduced, the service life of the exhaust check structure is guaranteed, and the noise generated by the valve plate impacting the valve seat is reduced. At the same time, the degree of opening of the exhaust channel of the structure is no longer limited by the limit of the deformation of the valve plate, so sufficient exhaust flow can be guaranteed. The exhaust check structure of the present invention solves the problem that the valve plate in the common pressure differential floating exhaust check structure is easy to quickly impact with the valve seat, thereby generating noise and affecting the life of the valve plate, and solves the problem that the exhaust flow rate is affected by the limitation of the degree of deformation of the valve plate in the common valve plate deformation exhaust check structure.

[0015] As a further improvement of the present invention, the crossbeam is arranged at the upper part of the valve cavity, and the crossbeam is a straight strip structure with a width smaller than the diameter of the valve cavity; an adjusting screw hole for screwing the adjusting member is arranged in the middle of the crossbeam.

[0016] As a further improvement of the present invention, the valve plate is a flat plate structure, and its outer diameter is larger than the inner diameter of the valve cavity; when the valve plate abuts against the top edge of the valve cavity, exhaust check can be achieved, and when the valve plate is separated from the top edge of the valve cavity, conventional exhaust can be achieved.

[0017] As a further improvement of the present invention, the adjusting member includes an adjusting screw and a limiting nut; wherein:

[0018] The adjusting screw is screwed on the adjusting screw hole;

[0019] The valve plate is movably arranged on the adjusting screw;

[0020] The limiting nut is threadedly connected to the top end of the adjusting screw.

[0021] As a further improvement of the present invention, the adjusting screw is provided with a first stage, a second stage and a third stage with increasing specifications in sequence; wherein:

[0022] The limit nut is threadedly connected to the first stage to form an axial upper limit position for the valve plate;

[0023] The valve plate is arranged on the second stage, and the top of the third stage forms an axial lower limit;

[0024] The outer diameter of the third stage is larger than the diameter of the adjusting screw hole.

[0025] As a further improvement of the present invention, the height of the third stage is equal to the distance from the cross beam to the top edge of the valve seat.

[0026] As a further improvement of the present invention, the height of the second stage is greater than the thickness of the valve plate.

[0027] As a further improvement of the present invention, a threaded section is provided at the middle portion of the adjusting screw corresponding to the bottom position of the third stage.

[0028] As a further improvement of the present invention, the impeller is a straight plate structure or a curved surface structure.

[0029] As a further improvement of the present invention, the valve seat is a cylindrical structure, and a mounting seat is provided at the bottom; the mounting seat is mounted on the static scroll plate by screws.

[0030] The present invention provides a pump body assembly, comprising a fixed scroll plate, an exhaust port, and an exhaust check structure installed on the fixed scroll plate and facing the exhaust port.

[0031] The present invention provides a compressor, comprising the pump body assembly.

[0032] The present invention provides a scroll compressor, including an exhaust check structure, connecting a valve plate to an adjusting screw, which is in turn connected to an impeller, and the adjusting screw is connected to an adjusting screw hole on a valve seat through a matching connection, so that the rotational motion of the impeller due to airflow is converted into the axial motion of the valve plate, so that the axial motion speed of the valve plate can be controlled by the relevant parameters of the thread set on the adjusting screw, so that the motion of the valve plate is stable and controllable, the impact force between the valve plate and the valve seat is reduced, the service life of the exhaust check structure is guaranteed, and the noise generated by the valve plate impacting the valve seat is reduced. At the same time, the degree of opening of the exhaust channel of the structure is no longer limited by the limit of the deformation of the valve plate, so that the exhaust flow rate can be guaranteed to be sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a structural schematic diagram of an exhaust check structure in the prior art;

[0035] Figure 2 It is a structural schematic diagram of another exhaust check structure in the prior art;

[0036] Figure 3 It is a schematic diagram of the installation structure of the exhaust check structure of the present invention;

[0037] Figure 4 It is a schematic diagram of the explosion structure of the exhaust check structure of the present invention;

[0038] Figure 5 yes Figure 4 Another view of the middle valve seat;

[0039] Figure 6 is a schematic diagram of the exhaust check mechanism starting to open according to the first embodiment of the present invention;

[0040] Figure 7 is a schematic diagram of the exhaust check mechanism of the first embodiment of the present invention when it is fully opened;

[0041] Figure 8 is a schematic diagram of the exhaust check mechanism of the first embodiment of the present invention when it starts to close;

[0042] Fig. 9 It is a schematic diagram of the exhaust check mechanism of the first embodiment of the present invention when it is fully closed.

[0043] In the figure, 1, valve seat; 101, crossbeam; 102, adjusting screw hole; 2, valve plate; 201, center through hole; 3, limit nut; 4, adjusting screw; 401, first stage; 402, second stage; 403, third stage; 404, threaded section; 405, cylindrical section; 5, valve cavity; 6, buffer valve plate; 61, baffle; 611, connecting part; 612, limiting part; 613, protrusion; 62, second valve plate; 7, static vortex plate; 701, exhaust port; 8, screw; 11, first valve seat; 111, first valve cavity; 12, first valve plate; 21, static vortex plate; 211, exhaust hole; 9, impeller. DETAILED DESCRIPTION

[0044] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0045] like Figure 3 and Figure 4 As shown, the present invention provides an exhaust check structure, which is used to be installed in the pump body assembly of the scroll compressor, and further, installed on the outside of the exhaust port 701 of the fixed scroll plate 7. In this embodiment, the exhaust check structure includes a valve seat 1, a valve plate 2, an adjusting member, and an impeller 9; wherein:

[0046] The valve seat 1 is arranged outside the exhaust port 701 of the fixed scroll 7; the valve seat 1 has an air flow channel, and the space enclosed by the channel is the valve cavity 5;

[0047] The valve plate 2 is movably arranged on the top of the valve seat 1, and is located at the end of the valve cavity 5 away from the exhaust port 701, and can connect or close the exhaust port 701 to the external environment for exhaust or exhaust check;

[0048] The adjusting member is screwed on the cross beam 101 in the valve chamber 5, and can rotate forward or reverse relative to the cross beam 101, and can achieve vertical lifting while rotating;

[0049] The top of the regulating member is connected to the valve plate 2 , and the bottom is connected to the impeller 9 located in the valve chamber 5 .

[0050] The lifting and lowering movement of the regulating member drives the valve plate 2 to close or open the valve cavity 5, thereby realizing normal exhaust or exhaust check.

[0051] The exhaust check structure provided by the present invention comprises a valve seat 1, a valve plate 2, an adjusting member and an impeller 9. A gas passage is provided in the valve seat 1. The space enclosed by the passage is a valve cavity 5. One end of the valve cavity 5 is connected to the exhaust port 701 of the static scroll 7, and the other end is connected to the exhaust space outside the static scroll 7. The valve plate 2 is located on the side where the valve cavity 5 is connected to the exhaust space outside the static scroll 7, and can move axially along the valve cavity 5. When it abuts against the outer end face of the valve seat 1, it can block the exhaust port 701 from the external exhaust space. When it is away from the outer end face of the valve seat 1, the exhaust port 701 and the exhaust space outside the static scroll 7 are blocked. The external exhaust space is connected; the valve plate 2 is connected to the adjusting member, and the adjusting member is connected to the impeller 9, and the adjusting member is connected to the adjusting screw hole on the valve seat 1 through the adjusting member, so that the rotational motion of the impeller 9 caused by the airflow is converted into the axial motion of the valve plate 2, so the axial motion speed of the valve plate 2 can be controlled by the relevant parameters of the thread set on the adjusting member, so that the movement of the valve plate 2 is stable and controllable, the impact force between the valve plate 2 and the valve seat 1 is reduced, the service life of the exhaust check structure is guaranteed, and the noise caused by the impact of the valve plate 2 on the valve seat 1 is reduced. At the same time, the degree of opening of the exhaust channel of the structure is no longer limited by the limit of the deformation of the valve plate 2, so sufficient exhaust flow can be guaranteed. The exhaust check structure of the present invention solves the problem that the valve plate 2 in the common pressure difference floating exhaust check structure is easy to have a rapid impact with the valve seat 1, thereby generating noise and affecting the life of the valve plate 2, and at the same time solves the problem that the exhaust flow is affected by the limitation of the deformation degree of the valve plate 2 in the common valve plate 2 deformation exhaust check structure.

[0052] like Figure 5 As shown, in this embodiment, the cross beam 101 is arranged on the upper part of the valve cavity 5 and has a certain distance from the top edge of the valve seat 1, so that a buffer cavity is formed between the cross beam 101 and the top edge of the valve seat 1; the cross beam 101 is a straight strip structure, and its width is smaller than the diameter of the valve cavity 5, so that there are channels for air flow on both sides of the cross beam 101; an adjusting screw hole 102 for screwing the adjusting part is provided in the middle of the cross beam 101.

[0053] like Figure 4 As shown, the valve plate 2 is a circular flat plate structure, and its outer diameter is larger than the inner diameter of the valve cavity 5. Through the above structural setting, the valve plate 2 can be pressed on the top edge of the valve cavity 5 without entering the valve cavity 5; specifically, the depth of the buffer cavity can be selected and set as needed.

[0054] The valve seat 1 is a cylindrical structure, so the buffer cavity is also a circular cavity, and the valve plate 2 is also a circular plate structure.

[0055] like Figure 3 , Fig. 9 As shown, when the valve plate 2 abuts against the top edge of the valve cavity 5, exhaust check can be achieved. Figure 7 and Figure 8 As shown, when the valve plate 2 is separated from the top edge of the valve cavity 5, conventional exhaust can be achieved.

[0056] like Figure 3-Figure 9 As shown, as an optional embodiment of the present invention, the adjusting member includes an adjusting screw 4 and a limiting nut 3; wherein:

[0057] The adjusting screw rod 4 is screwed on the adjusting screw hole 102;

[0058] The valve plate 2 is movably arranged on the adjusting screw 4;

[0059] The limiting nut 3 is threadedly connected to the top end of the adjusting screw 4 .

[0060] When in use, the adjusting screw 4 can rotate relative to the adjusting screw hole 102 , and when rotating, it drives the valve plate 2 to move up and down, and the valve cavity 5 of the valve seat 1 is closed or opened through the valve plate 2 .

[0061] like Figure 3-Figure 9 As shown, the adjusting screw 4 is provided with a first stage 401, a second stage 402 and a third stage 403 of increasing specifications in sequence; specifically, the diameter of the third stage 403 is larger than the diameter of the adjusting screw 4; the diameter of the second stage 402 is smaller than the diameter of the adjusting screw 4, and the diameter of the first stage 401 is smaller than the diameter of the second stage 402. Wherein:

[0062] The limiting nut 3 is screwed on the first stage 401 to form an axial upper limit for the valve plate 2;

[0063] The valve plate 2 is arranged on the second stage 402, and the top of the third stage 403 forms an axial lower limit;

[0064] The outer diameter of the third stage 403 is larger than the diameter of the adjusting screw hole 102 .

[0065] In order to ensure that the valve plate 2 can completely seal the valve cavity 5, the height of the third stage 403 is equal to the distance from the cross beam 101 to the top edge of the valve seat 1. Since the valve plate 2 needs to move up and down in the second stage 402, the diameter of the valve plate center through hole 201 will be slightly larger than the diameter of the second stage 402, that is, there will be a small gap between the two. If the height of the third stage 403 is less than the depth of the buffer cavity from the cross beam 101 to the top edge of the valve seat 1, the end face of the third stage 403 will not be able to block this small gap, and air will leak in the process of airflow being sucked back into the compression cavity; if the height of the third stage 403 is greater than the depth of the buffer cavity from the cross beam 101 to the top edge of the valve seat 1, then when the valve plate 2 falls to the end face of the third stage 403, it will be pushed up and unable to contact the annular upper end face of the valve seat 1, and there will be no way to prevent the gas from flowing back into the compression cavity.

[0066] In order to ensure that the exhaust area is large enough and the exhaust channel can be adjusted according to the exhaust pressure, the height of the second stage 402 is greater than the thickness of the valve plate 2. Through the above structural setting, the position of the valve plate 2 can be adjusted within the height range of the second stage 402, thereby realizing the size adjustment of the exhaust area.

[0067] like Figure 6-Figure 9 As shown, a threaded section 404 is provided at the middle of the adjusting screw 4 corresponding to the bottom position of the third stage 403 .

[0068] Furthermore, the bottom of the threaded section 404 is located in the middle of the adjusting screw 4, and the adjusting screw 4 also has a cylindrical section 405 at the bottom of the threaded section 404; Figure 8 As shown, when the adjusting screw 4 is raised to the bottom of the threaded section 404 and is screwed to the adjusting screw hole 102 of the crossbeam 101, the impeller 9 will not collide with the valve chamber 5, and the maximum exhaust area can be achieved.

[0069] In this embodiment, the impeller 9 may be a straight plate structure.

[0070] Of course, the impeller 9 may also be a curved structure, which is not specifically limited here.

[0071] like Figure 4 As shown, the valve seat 1 is a cylindrical structure, and a mounting seat is provided at the bottom; the mounting seat is mounted on the fixed scroll plate 7 by screws 8.

[0072] In this embodiment, the present invention provides a pump body assembly, including a fixed scroll plate 7, an exhaust port 701, and an exhaust check structure installed on the fixed scroll plate 7 and facing the exhaust port 701.

[0073] It should be noted here that directly facing the exhaust port 701 means that the central axis of the valve cavity 5 of the valve seat 1 coincides with the central axis of the exhaust port 701 .

[0074] However, the diameter of the valve cavity 5 is larger than the diameter of the exhaust port 701 .

[0075] The pump body assembly of the present invention connects the valve plate 2 with the second stage 402 of the adjusting screw 4. The adjusting screw 4 is inserted into the adjusting screw hole 102 located in the valve cavity 5 to form a threaded connection. The cylindrical section 405 of the adjusting screw 4 is connected to the impeller 9. The impeller 9 is located in the valve cavity 5 and can rotate due to the discharged gas / backflowing gas (the rotation directions in the two cases are opposite); when the impeller 9 rotates, the adjusting screw 4 will also rotate in the same direction. At the same time, because it is connected to the adjusting screw hole 102, it will also move axially, causing the valve plate 2 to move axially, thereby achieving the distance / approach and abutment between the valve plate 2 and the outer end surface of the valve seat 1, that is, realizing the connection between the exhaust cavity and the external exhaust space. By designing and adjusting the thread parameters of the threaded section 404 of the screw 4, the axial moving speed of the valve plate 2 can be parametrically controlled, so that the valve plate 2 contacts the valve seat 1 at a controllable and appropriate speed, reducing the impact force between the valve plate 2 and the valve seat 1, ensuring the service life of the exhaust check structure, and reducing the noise caused by the slapping of the valve plate 2. The form of the impeller 9 is determined according to the specific needs of the compressor.

[0076] The present invention provides a compressor, comprising the above-mentioned pump body assembly.

[0077] The pump body assembly includes an exhaust check structure.

[0078] like Figure 3-Figure 5 As shown, the valve seat 1 in the exhaust check structure is installed above the exhaust port 701 of the fixed scroll 7 by means of a screw 8, one end of the valve cavity 5 is connected to the exhaust port 701, and the other end is connected to the exhaust space outside the fixed scroll 7. A crossbeam 101 is arranged in the valve seat 1, and an adjusting screw hole 102 is arranged on the crossbeam 101. The adjusting screw 4 includes: a first stage 401, a second stage 402, a third stage 403, a threaded section 404, and a cylindrical section 405. Among them, the diameters of the first, second and third stages increase successively; the limiting nut 3 is connected to the first stage 401 (the thread on the surface of the first stage 401 is omitted) and abuts against the end face of the second stage 402; the valve plate 2 is inserted into the second stage 402 through its central through hole 201, and the diameter of the central through hole 201 is slightly larger than the diameter of the second stage 402, smaller than the diameter of the third stage 403, and smaller than the circumscribed circle diameter of the limiting nut 3, so that the valve plate 2 can move axially up and down within the height range of the second stage 402, but will not enter the first stage 401 and the third stage 403; the threaded section 404 is inserted into the adjusting screw hole 102 to form a threaded connection; the cylindrical section 405 is connected to the impeller 9, so that when the impeller 9 rotates, the adjusting screw 4 also rotates in the same direction at the same time.

[0079] like Figure 6 and Figure 7 As shown in FIG. 1 , the exhaust check mechanism of the present invention begins to open and is fully opened. Figure 6 As shown, the gas in the exhaust chamber enters the valve chamber 5. The gas pressure in the valve chamber 5 is greater than the gas pressure in the external exhaust space, so it exerts upward pressure on the valve plate 2, causing the valve plate 2 to move upward, forming a gap between the valve plate 2 and the end face of the valve seat 1. The gas in the valve chamber 5 flows out from the gap. At this time, the valve chamber 5 forms an upward airflow, causing the impeller 9 to rotate in one direction, driving the adjusting screw 4 to rotate in the same direction. Since the threaded section 404 is threadedly connected to the adjusting screw hole 102, the adjusting screw 4 will also move upward in the axial direction, causing the valve plate 2 to move further away from the end face of the valve seat 1, until the cylindrical section 405 reaches the adjusting screw hole 102, so that the adjusting screw 4 can no longer move upward and the impeller 9 stops rotating. Figure 7 At the fully open moment shown, the gas in the valve chamber 5 flows to the external exhaust space at a maximum flow rate.

[0080] like Figure 8 and Fig. 9 As shown in FIG. 1 , the exhaust check mechanism of the present invention begins to close and is completely closed. Figure 8 As shown, since the air pressure in the external exhaust space is greater than the air pressure in the valve chamber 5, an airflow will be formed to flow back to the exhaust port 701 downward, causing the impeller 9 to react with the Figure 6 The rotational movement in the opposite direction drives the adjusting screw 4 to rotate in the same direction. At the same time, the adjusting screw 4 moves downward along the axial direction, so that the valve plate 2 is closer to the end face of the valve seat 1, until the valve plate 2 abuts against the end face of the valve seat 1 due to the air pressure of the external exhaust space. Fig. 9 At the fully closed moment shown, the valve plate 2 isolates the valve cavity 5 from the external exhaust space, and the gas cannot continue to flow back to the exhaust port 701.

[0081] It is worth noting that the valve plate 2 can move up and down within the height range of the second stage 402. This design is a design to prevent air holding. If the valve plate 2 cannot move up and down within the height range of the second stage 402, when the valve cavity 5 abuts against the end surface of the valve seat 1, the valve cavity 5 is isolated from the external exhaust space. Fig. 9 As shown, even if the gas pressure in the valve cavity 5 gradually increases to a level greater than the gas pressure in the external exhaust space, it cannot be connected to the external exhaust space to form a stable upward airflow, the impeller 9 cannot rotate, the adjusting screw 4 cannot move upward, the valve cavity 5 and the end face of the valve seat 1 cannot be separated, and the gas will be trapped in the valve cavity 5, thereby damaging the compressor parts. Therefore, it is necessary for the valve plate 2 to be able to move up and down within the height range of the second stage 402, so that after the gas pressure in the valve cavity 5 increases to a level greater than the gas pressure in the external exhaust space, the valve plate 2 can be separated from the end face of the valve seat 1 to form a gap, so that the gas in the valve cavity 5 can flow out of the external exhaust space to form an airflow, so that the impeller 9 can rotate and complete the subsequent opening action.

[0082] It should be noted that the definition of holding breath is: In the present invention, the opening and closing of the valve plate 2 is controlled by the airflow driving the impeller 9 to rotate. Fig. 9 In the state shown, the valve plate 2 is in close contact with the upper end surface of the valve seat 1, and the space inside the valve seat 1 is completely separated from the space outside it. When the air pressure inside the valve seat 1 gradually rises to a level higher than the air pressure outside the valve seat 1, theoretically, the valve plate should be opened to allow the gas to flow out. If the valve plate 2 is completely fixed on the second stage 402 so that it cannot move up and down, then no matter how the air pressure inside the valve seat 1 increases, the valve plate 2 will not move, because the space inside the valve seat 1 and the external space are completely separated by the valve plate 2, and a one-way airflow cannot be formed to drive the impeller 9 to rotate. In this case, the gas will remain inside the valve seat 1 and cannot be ejected. This is called "holding air". The gas inside the valve seat 1 cannot be discharged for a long time, and the air pressure is getting higher and higher, which will damage the compressor. Therefore, in order to prevent holding of air, the present invention allows the valve plate 2 to move up and down appropriately along the second stage 402. In this way, when the internal air pressure of the valve seat 1 is greater than the external air pressure, the valve plate 2 can slightly leave the upper end surface of the valve seat 1, revealing a gap for gas to spray out to form an airflow (such as Figure 6 As shown), the impeller 9 is driven to rotate, so that the adjusting screw 4 drives the valve plate 2 to complete a further opening action.

[0083] Since the moving speed of the valve plate 2 is limited by the moving speed of the adjusting screw 4, and when the rotation speed of the impeller 9 is the same, the moving speed of the adjusting screw 4 can be controlled by the thread segment 404. Specifically, the larger the value of the thread parameters of the thread segment 404, such as the thread lead angle, the greater the axial moving distance of the adjusting screw 4 when the impeller 9 rotates one circle (the adjusting screw 4 also rotates one circle at the same time), and the faster the axial moving speed of the valve plate 2; the smaller the thread lead angle of the thread segment 404, the slower the axial moving speed of the valve plate 2. Therefore, according to the specific needs of various types of scroll compressors, the thread parameters of the thread segment 404 can be designed to achieve parametric control of the axial moving speed of the valve plate 2, so that the valve plate 2 can contact the end face of the valve seat 1 at the most suitable speed. In this case, the impact force of the valve plate 2 on the end face of the valve seat 1 can be reduced, and the valve plate 2 can be prevented from hitting the end face of the valve seat 1 and making a large noise, and the operation reliability of the valve plate 2 is also guaranteed. In addition, the longer the length of the threaded section 404 is, the greater the distance that the valve plate 2 can be away from the end face of the valve seat 1 is, and the greater the gas flow rate is, and the design can be performed according to specific needs to ensure sufficient exhaust flow. In addition, in this embodiment, the shape of the blades on the impeller 9 is a flat plate, so when driven by gases with the same flow rate and opposite directions, the forward / reverse speeds of the impeller 9 are roughly equal, that is, the movement speed of the valve plate during the opening / closing process is roughly the same. In fact, according to the specific needs of the compressor, the shape of the blades on the impeller 9 can also be designed into a curved surface form. In this form, even when the impeller 9 is driven by gases with the same flow rate and opposite directions, its forward / reverse speed will have a difference, so the exhaust check structure of the present invention can achieve fast opening and slow closing or slow opening and fast closing.

[0084] The exhaust check structure of the present invention can not only prevent the gas in the exhaust space outside the stationary scroll disk from flowing back into the exhaust chamber, but also parameterize the axial movement speed of the valve plate to avoid a large impact between the valve plate and the valve seat, which is beneficial to improving the service life of the exhaust check structure and reducing noise.

[0085] The present invention provides a scroll compressor, including an exhaust check structure, connecting a valve plate 2 with an adjusting screw 4, which in turn is connected to an impeller 9, and by matching the adjusting screw 4 with the adjusting screw hole on the valve seat 1, the rotational motion of the impeller 9 due to the airflow is converted into the axial motion of the valve plate 2, so that the axial motion speed of the valve plate 2 can be controlled by the relevant parameters of the thread set on the adjusting screw 4, so that the motion of the valve plate 2 is stable and controllable, the impact force between the valve plate 2 and the valve seat 1 is reduced, the service life of the exhaust check structure is guaranteed, and the noise generated by the valve plate 2 impacting the valve seat 1 is reduced. At the same time, the opening degree of the exhaust channel of the structure is no longer limited by the deformable limit of the valve plate 2, so that the exhaust flow rate can be guaranteed to be sufficient.

[0086] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0087] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0088] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An exhaust check structure, characterized in that: It includes valve seat, valve plate, adjusting part and impeller; among which: The valve seat is arranged outside the exhaust port of the fixed scroll disk, and an air flow channel is provided inside the valve seat, and the space enclosed by the channel is a valve cavity; The valve plate is movably arranged on the top of the valve seat, and can connect or close the exhaust port to the external environment for exhaust or exhaust check; The regulating member is screwed onto the crossbeam in the valve cavity; The top of the regulating member is connected to the valve plate, and the bottom is connected to the impeller located in the valve cavity; The cross beam is arranged at the upper part of the valve cavity and has a certain distance from the top edge of the valve seat, so as to form a buffer cavity between the cross beam and the top edge of the valve seat; the axial movement speed of the valve plate is controlled by the thread parameters set on the adjusting member; The middle part of the cross beam is provided with an adjusting screw hole for the adjusting member to be screwed; The adjusting member comprises an adjusting screw and a limiting nut; wherein: the adjusting screw is screwed on the adjusting screw hole; the valve plate is movably arranged on the adjusting screw; and the limiting nut is screwed on the top of the adjusting screw. The adjusting screw is provided with a first stage, a second stage and a third stage of increasing specifications in sequence; wherein: the limit nut is screwed on the first stage to form an axial upper limit for the valve plate; the valve plate is passed through the second stage, and an axial lower limit is formed by the top of the third stage; the height of the second stage is greater than the thickness of the valve plate, so that the position of the valve plate can be adjusted within the height range of the second stage, thereby realizing the size adjustment of the exhaust area; the outer diameter of the third stage is greater than the diameter of the adjusting screw hole.

2. The exhaust check structure according to claim 1, characterized in that: The crossbeam is a straight strip structure, and its width is smaller than the diameter of the valve cavity.

3. The exhaust check structure according to claim 1, characterized in that: The valve plate is a flat plate structure, and its outer diameter is larger than the inner diameter of the valve cavity. When the valve plate abuts against the top edge of the valve cavity, exhaust check can be achieved, and when the valve plate is separated from the top edge of the valve cavity, conventional exhaust can be achieved.

4. The exhaust check structure according to claim 1, characterized in that: The height of the third stage is equal to the distance from the cross beam to the top edge of the valve seat.

5. The exhaust check structure according to claim 1, characterized in that: A threaded section is arranged in the middle of the adjusting screw rod corresponding to the bottom position of the third stage.

6. The exhaust check structure according to claim 1, characterized in that: The impeller is a straight plate structure or a curved surface structure.

7. A pump assembly, characterized in that: It comprises a fixed scroll disk, an exhaust port, and an exhaust check structure as described in any one of claims 1 to 6, which is installed on the fixed scroll disk and directly faces the exhaust port.

8. A compressor, characterized in that: Comprising the pump body assembly as claimed in claim 7.

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