Backpressure assembly, compressor and refrigeration equipment

Abstract

The utility model discloses a backpressure assembly, a compressor and refrigeration equipment, and relates to the technical field of compressors. Wherein the backpressure assembly comprises a backpressure plate and a valve element, and one end of the backpressure plate is provided with a first cavity communicated with the first exhaust port; the back pressure plate is provided with a mounting part on the inner side of the first cavity, and the mounting part is provided with a mounting hole; the back pressure plate is further provided with a plurality of air passing holes used for communicating the first cavity with the second exhaust port, and the air passing holes are located between the installation part and the cavity peripheral wall of the first cavity. The valve element comprises a matching part and a plugging part which are connected, the matching part is movably mounted in the mounting hole, and the plugging part is arranged on the side, close to the compression assembly, of the backpressure plate; the blocking part can move away from or close to the compression assembly to open or block the second exhaust port; the outer diameter of the matching part is smaller than that of the plugging part. According to the technical scheme, airflow pulsation impact and turbulence noise caused by exhaust can be effectively improved, noise in the exhaust process of the compressor is lowered, and then noise of the whole refrigeration equipment is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a back pressure component, a compressor and a refrigeration device. Background Art

[0002] The compressor is one of the core components of refrigeration equipment.

[0003] The scroll compressor includes a fixed scroll and a movable scroll. The movable scroll is assembled with the fixed scroll and can move relative to the fixed scroll. When the scroll compressor is working, the movable scroll moves relative to the fixed scroll, so that the refrigerant forms a continuous operation of suction, compression and discharge in the compression chamber defined by the fixed scroll and the movable scroll, thereby realizing the suction, compression and exhaust process of the compressor.

[0004] In the related art, a back pressure assembly is provided on the fixed scroll disk, and the gas discharged from the exhaust port of the fixed scroll disk passes through the back pressure assembly and the partition plate, enters the shell, and is finally discharged from the outlet on the shell.

[0005] However, in the related art, the exhaust flow passage from the exhaust port of the fixed scroll disk to the air outlet of the partition plate is narrow, resulting in large exhaust resistance and fast flow rate, which can easily cause large air flow pulsation and turbulent noise, resulting in the problem of high overall noise in the compressor. Utility Model Content

[0006] The main purpose of the utility model is to provide a back pressure component, which is intended to reduce the noise during the exhaust process of the compressor and reduce the noise of the entire refrigeration equipment.

[0007] To achieve the above purpose, the back pressure assembly proposed by the utility model includes:

[0008] A back pressure plate, used for being installed on the compression assembly, wherein the end of the back pressure plate facing away from the compression assembly is provided with a first cavity connected to the first exhaust port; the back pressure plate is provided with a mounting portion inside the first cavity, and the mounting portion is provided with a mounting hole; the back pressure plate is also provided with a plurality of air holes for connecting the first cavity and the second exhaust port, and the air holes are located between the mounting portion and the cavity peripheral wall of the first cavity; and

[0009] The valve core comprises a matching portion and a blocking portion connected to each other, wherein the matching portion is movably mounted on the mounting hole, and the blocking portion is arranged on a side of the back pressure plate close to the compression assembly; the blocking portion can move away from or close to the compression assembly to open or block the second exhaust port;

[0010] Wherein, the outer diameter d1 of the matching portion is smaller than the outer diameter d2 of the blocking portion.

[0011] In one embodiment of the present application, the matching portion is slidably matched with the mounting hole.

[0012] In an embodiment of the present application, the mating portion and the plugging portion are connected at an angle.

[0013] In an embodiment of the present application, the mating portion and the plugging portion are perpendicularly connected.

[0014] In an embodiment of the present application, the plugging portion and the air passing hole do not overlap in the axial direction of the back pressure plate.

[0015] In an embodiment of the present application, the valve core is an integral structure.

[0016] In an embodiment of the present application, the outer diameter d1 of the mating portion and the outer diameter d2 of the plugging portion satisfy: 2 ≤ d2 / d1 ≤ 4.5.

[0017] In an embodiment of the present application, the back pressure plate further includes:

[0018] A plate body for installing with the compression assembly; and

[0019] A ring-shaped convex platform provided on a side of the plate body facing away from the compression assembly, and enclosing with the plate body to form the first cavity;

[0020] The ring-shaped convex platform divides the plate body into a central region and a peripheral region, and the installation portion and the air passing hole are both provided in the central region.

[0021] In an embodiment of the present application, defining the total height of the back pressure plate in the axial direction as H, and the height distance between the upper end surface of the ring-shaped convex platform and the upper end surface of the central region as H1, satisfying: H1 ≥ 1 / 3H.

[0022] In an embodiment of the present application, defining the inner diameter of the ring-shaped convex platform as D1 and the outer diameter of the plate body as D2, satisfying: 2 ≤ D2 / D1 ≤ 5.

[0023] In an embodiment of the present application, a second cavity is provided at an end of the plate body facing away from the first cavity, and the second cavity is used to communicate the second exhaust port with the air passing hole;

[0024] The plugging portion is located in the second cavity.

[0025] In an embodiment of the present application, the plate body is provided with a plurality of air return holes communicating the first cavity with the second cavity, and the air return holes at least partially overlap with the plugging portion in the axial direction of the back pressure plate.

[0026] In an embodiment of the present application, there are a plurality of air passing holes, and the plurality of air passing holes are spaced apart around the circumference of the installation portion.

[0027] To achieve the above object, the present application further provides a compressor, including:

[0028] A housing;

[0029] A partition plate disposed in the housing, the partition plate being provided with a first exhaust port;

[0030] A compression assembly including a stationary scroll plate and a moving scroll plate that cooperate with each other, the stationary scroll plate being provided with a second exhaust port; and

[0031] The above-mentioned back pressure assembly disposed between the stationary scroll plate and the partition plate; the first cavity communicates with the first exhaust port, and the through hole communicates the first cavity with the second exhaust port.

[0032] In an embodiment of the present application, the total gas passing area of several of the through holes is greater than the gas passing area of the second exhaust port.

[0033] In an embodiment of the present application, a second cavity communicating with the second exhaust port is formed between the back pressure plate and the stationary scroll plate, and the plugging portion is movably located in the second cavity;

[0034] Define the lift height of the plugging portion as H2, and the diameter of the second exhaust port as D, satisfying: D / 4 ≤ H2 ≤ D / 2.

[0035] To achieve the above object, the present application further provides a refrigeration device including the above-mentioned compressor.

[0036] In the technical solution of the back pressure assembly of the present utility model, the back pressure plate is installed between the compression assembly and the partition plate. One end of the back pressure plate facing away from the compression assembly is provided with a first cavity, and the first cavity communicates with the first exhaust port of the partition plate; by providing several through holes on the back pressure plate, the through holes can communicate the second exhaust port of the compression assembly with the first cavity, so that the second exhaust port, several through holes, the first cavity and the first exhaust port form an exhaust passage for air flow to discharge. At the same time, the back pressure plate is provided with an installation portion, and the installation portion is provided with an installation hole for installing a valve core. The valve core includes a cooperating portion and a plugging portion connected to each other. The cooperating portion is movably installed in the installation hole, and the plugging portion is located on the side of the back pressure plate close to the compression assembly, and can open the second exhaust port during exhaust and block the second exhaust port during shutdown to achieve the functions of smooth exhaust and prevention of air flow backflow.

[0037] Moreover, by setting the outer diameter d1 of the cooperating portion to be smaller than the outer diameter d2 of the plugging portion, the aperture size of the installation hole cooperating with the cooperating portion can be reduced. Furthermore, compared with the back pressure assembly using a cylindrical valve core in the related art, the present embodiment enlarges the flow area of the through hole, can effectively improve the air flow pulsation impact and turbulent noise caused by exhaust, reduce the noise during the exhaust process of the compressor, and further reduce the overall noise of the refrigeration device. Brief Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0039] Figure 1 It is a schematic structural diagram of an embodiment of a compressor of the present invention;

[0040] Figure 2 It is Figure 1 a partial enlarged view of part A in

[0041] Figure 3 It is a schematic structural diagram of an embodiment of a back pressure assembly of the present invention;

[0042] Figure 4 It is an exploded structural diagram of an embodiment of a back pressure assembly of the present invention;

[0043] Figure 5 It is a schematic structural diagram of a back pressure plate from one perspective in an embodiment of the present invention;

[0044] Figure 6 It is a schematic structural diagram of a back pressure plate from another perspective in an embodiment of the present invention;

[0045] Figure 7 It is a schematic structural diagram of a valve core in an embodiment of the present invention;

[0046] Figure 8 It is a cross-sectional view of a valve core in an embodiment of the present invention.

[0047] Explanation of the reference numerals in the drawings:

[0048] Reference numeral Name Reference numeral Name 1 Back pressure component 12 Spool valve 11 Back pressure plate 121 Fitting part 111 Installation part 122 Sealing part 112 Plate body 2 Partition plate 113 Annular boss 201 First exhaust port 101 First cavity 3 Compression component 102 Mounting hole 31 Stationary scroll plate 103 Air passage hole 32 Moving scroll plate 104 Second cavity 301 Second exhaust port 105 Return air hole 4 Housing

[0049] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0051] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0052] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0054] In the related art, a back-pressure assembly is provided on the stationary scroll plate. The gas discharged from the exhaust port of the stationary scroll plate enters the housing after passing through the back-pressure assembly and the partition plate, and finally is discharged from the air outlet on the housing.

[0055] However, in the back-pressure assembly in the related art, the valve core has a cylindrical structure, and the part where the valve core cooperates with the back-pressure plate is relatively thick, which results in a narrow gas passage on the back-pressure plate and a narrow exhaust flow passage from the exhaust port of the stationary scroll plate to the air outlet of the housing, leading to a large exhaust resistance, a fast flow rate, easy to cause large airflow pulsation and turbulent noise, and causing a problem of relatively large overall noise of the compressor.

[0056] Based on this, the present utility model proposes a back-pressure assembly 1, which is applied to a compressor, aiming to improve the airflow pulsation and turbulent noise during the exhaust process of the compressor by improving the structure of the valve core 12, so as to achieve the purpose of reducing the overall noise of the compressor. It can be understood that as Figure 1 and Figure 2, the compressor includes a housing 4, a compression assembly 3, and a partition plate 2. The partition plate 2 is disposed inside the housing 4 and divides the inner cavity of the housing 4 into two chambers. The compression assembly 3 is disposed in the chamber below the partition plate 2. The air outlet of the housing 4 communicates with the chamber above the partition plate 2. Among them, the back pressure assembly 1 is disposed between the compression assembly 3 and the partition plate 2. After the gas compressed by the compression assembly 3 passes through the second exhaust port 301 of the compression assembly 3, the air flow passage on the back pressure assembly 1, and the first exhaust port 201 on the partition plate 2 in sequence, it is discharged from the air outlet of the housing 4 to enter the pipeline of the refrigeration device. Hereinafter, the structure of the back pressure assembly 1 will be described by way of embodiments.

[0057] As Figures 1 to 4 and Figure 8 shown, the back pressure assembly 1 includes a back pressure plate 11 and a valve core 12.

[0058] The back pressure plate 11 is used to be installed on the compression assembly 3. One end of the back pressure plate 11 facing away from the compression assembly 3 is provided with a first cavity 101 communicating with the first exhaust port 201. The back pressure plate 11 is provided with a mounting portion 111 in the first cavity 101. The mounting portion 111 is provided with a mounting hole 102 penetrating through both axial sides thereof. The back pressure plate 11 is further provided with a plurality of air passing holes 103 for communicating the first cavity 101 with the second exhaust port 301. The air passing holes 103 are located between the mounting portion 111 and the circumferential wall of the first cavity 101.

[0059] The valve core 12 includes a mating portion 121 and a plugging portion 122 connected to each other. The mating portion 121 is movably installed in the mounting hole 102. The plugging portion 122 is disposed on the side of the back pressure plate 11 close to the compression assembly 3. The plugging portion 122 can move away from or close to the compression assembly 3 to open or block the second exhaust port 301. Among them, the outer diameter d1 of the mating portion 121 is smaller than the outer diameter d2 of the plugging portion 122.

[0060] In this embodiment, the back pressure plate 11 is on the compression assembly 3. Specifically, the compression assembly 3 includes a moving scroll plate 32 and a stationary scroll plate 31 that cooperate with each other. The back pressure plate 11 of the present invention is installed on the side of the stationary scroll plate 31 facing away from the moving scroll plate 32, and can apply a back pressure to the stationary scroll plate 31 to ensure the cooperation reliability between the stationary scroll plate 31 and the moving scroll plate 32 and prevent refrigerant leakage. Optionally, the back pressure plate 11 can be fixedly welded, screwed, or clamped to the stationary scroll plate 31.

[0061] It can be understood that the back pressure plate 11 is located between the compression assembly 3 and the partition plate 2. A first cavity 101 communicating with the first exhaust port 201 on the partition plate 2 is formed between the back pressure plate 11 and the partition plate 2. At the same time, a plurality of through holes 103 communicating the first cavity 101 with the second exhaust port 301 are provided on the back pressure plate 11. Thus, the air flow compressed by the compression assembly 3 can flow through the second exhaust port 301, a plurality of through holes 103, the first cavity 101, and the first exhaust port 201 in sequence and then flow to the air outlet of the housing 4 and be discharged, realizing the function of smooth exhaust.

[0062] In actual application, after the compressor stops running, the high-pressure gas in the exhaust pipe may backflow into the compression assembly 3 and cause impact. To prevent backflow, a valve core 12 slidably matched with the back pressure plate 11 is provided in the back pressure assembly 1. The valve core 12 can open the second exhaust port 301 of the compression assembly 3 during the operation stage and can block the second exhaust port 301 of the compression assembly 3 under the pressure of the backflow air flow when the machine stops, preventing backflow. Specifically, the back pressure plate 11 is provided with an installation part 111 in the first cavity 101. The installation part 111 is provided with an installation hole 102 penetrating through both axial sides thereof. The valve core 12 includes a matching part 121 and a blocking part 122 connected to each other. The matching part 121 is movably installed in the installation hole 102, and the blocking part 122 is located on the side of the back pressure plate 11 close to the compression assembly 3 and corresponds to the second exhaust port 301. Thus, when the compression assembly 3 exhausts, the compressed high-pressure air flow can push open the blocking part 122 to open the second exhaust port 301, and the air flow discharged from the second exhaust port 301 can flow through the through holes 103, the first cavity 101, and the first exhaust port 201 to the air outlet of the housing 4, realizing smooth exhaust; when the compressor stops running, the air flow in the first cavity 101 can drive the matching part 121 to move relative to the installation hole 102 to drive the blocking part 122 to move towards the compression assembly 3 to block the second exhaust port 301, achieving the effect of preventing backflow. Therefore, the back pressure assembly 1 of this embodiment can both realize smooth exhaust and prevent backflow.

[0063] It should be noted that the vent hole 103 and the mounting portion 111 in this embodiment are both located on the back pressure plate 11. The vent hole 103 is used for exhausting air outwards, and the mounting portion 111 is used for mounting the valve core 12. The vent hole 103 is located between the mounting portion 111 and the circumferential wall of the first cavity 101. It can be understood that if the outer diameter of the mounting portion 111 is relatively large, it will affect the flow area of the vent hole 103. When the flow area of the vent hole 103 is relatively small, air flow pulsation and turbulent noise are likely to occur. For this reason, in this embodiment, the outer diameter d1 of the mating portion 121 is set to be smaller than the outer diameter d2 of the blocking portion 122, so that the aperture size of the mounting hole 102 that mates with the mating portion 121 can be reduced. Furthermore, compared with the back pressure assembly 1 using a cylindrical valve core 12 in the related art, when the thickness of the mounting portion 111 is the same, the outer diameter size of the mounting portion 111 can be correspondingly reduced in this embodiment. Then, when the inner diameter size of the first cavity 101 is the same, the flow area of the vent hole 103 in this embodiment is larger, so that the air flow pulsation impact and turbulent noise caused by exhaust can be effectively suppressed.

[0064] The mating portion 121 and the blocking portion 122 are connected. The outer diameter d1 of the mating portion 121 is smaller than the outer diameter d2 of the blocking portion 122. It can be understood that the mating portion 121 and the blocking portion 122 can be a stepped structure or a conical structure connected coaxially, or can also be a "T" - shaped structure or other shaped structures, etc. In actual application, the mating portion 121 and the blocking portion 122 can be a split structure or an integral structure. In this embodiment, considering the assembly efficiency, it is preferred that the mating portion 121 and the blocking portion 122 are integrally formed.

[0065] The way of the movable fit between the mating portion 121 and the mounting hole 102 can be determined according to the actual situation. For example, it can be a rotational fit or a sliding fit. When it is a rotational fit, the mating portion 121 can rotate in the mounting hole 102 to drive the blocking portion 122 to move closer to the compression assembly 3; when it is a sliding fit, the mating portion 121 can move along the axial direction of the mounting hole 102 to drive the blocking portion 122 to move closer to the compression assembly 3. Considering factors such as process difficulty, in this embodiment, the mating portion 121 is slidably fitted in the mounting hole 102. With such a setting, the assembly structure can be simplified and the assembly efficiency can be improved.

[0066] In actual application, the number of the vent holes 103 can be determined according to the actual situation. For example, it can be 1, 2, 3 or more. When the number of the vent holes 103 is multiple, the multiple vent holes 103 are spaced apart around the circumference of the mounting portion 111, making the air flow distribution more uniform, further reducing turbulence and lowering noise.

[0067] In practical applications, the shape of the air vent 103 can also be determined according to the actual situation. For example, it can be circular, square, rectangular, kidney-shaped, trapezoidal or other shapes, etc. The specific quantity and shape of the air vent 103 are not limited herein.

[0068] In summary, in the back pressure assembly 1 of the technical solution of the present utility model, the back pressure plate 11 is installed between the compression assembly 3 and the partition plate 2. One end of the back pressure plate 11 facing away from the compression assembly 3 is provided with a first cavity 101, and the first cavity 101 communicates with the first exhaust port 201 of the partition plate 2; by providing a plurality of air vents 103 on the back pressure plate 11, the air vents 103 can communicate the second exhaust port 301 of the compression assembly 3 with the first cavity 101, so that the second exhaust port 301, the plurality of air vents 103, the first cavity 101 and the first exhaust port 201 form an exhaust passage for air flow to discharge. At the same time, the back pressure plate 11 is provided with an installation part 111, and the installation part 111 is provided with an installation hole 102 penetrating through both axial sides thereof for installing the valve core 12. The valve core 12 includes a mating part 121 and a plugging part 122 connected to each other. The mating part 121 is movably installed in the installation hole 102, and the plugging part 122 is located on the side of the back pressure plate 11 close to the compression assembly 3, and can open the second exhaust port 301 during exhaust and plug the second exhaust port 301 during shutdown to achieve the functions of smooth exhaust and prevention of air flow backflow.

[0069] Moreover, by setting the outer diameter d1 of the mating part 121 to be smaller than the outer diameter d2 of the plugging part 122, the aperture size of the installation hole 102 cooperating with the mating part 121 can be reduced. Furthermore, compared with the back pressure assembly 1 adopting a cylindrical valve core 12 in the related art, the flow area of the air vent 103 is enlarged in this embodiment, which can effectively improve the air flow pulsation impact and turbulent noise caused by exhaust, reduce the noise during the exhaust process of the compressor, and further reduce the noise of the whole refrigeration equipment.

[0070] In an embodiment of the present application, as Figure 7 and Figure 8 , the mating part 121 and the plugging part 122 are connected at an angle.

[0071] In this embodiment, by connecting the mating part 121 and the plugging part 122 at an angle, the overall structural strength of the valve core 12 can be increased. Optionally, the mating part 121 and the plugging part 122 can be connected at an acute angle, an obtuse angle or a right angle. Optionally, the mating part 121 has a columnar structure, and the plugging part 122 has a plate-like structure.

[0072] Furthermore, as Figure 7 and Figure 8, the mating part 121 and the blocking part 122 are vertically connected. With such a design, the overall structural strength of the valve core 12 can be further enhanced through the right-angle connection structure, preventing the valve core 12 from deforming when impacted by high-pressure air flow.

[0073] Furthermore, as shown in Figure 3 , Figure 7 and Figure 8 , the blocking part 122 is connected to the central position of the mating part 121. It can be understood that the mating part 121 is slidably installed in the installation hole 102 in a columnar shape, and the blocking part 122 is used to block or open the second exhaust port 301. In this embodiment, by connecting the blocking part 122 to the central position of the mating part 121, when the mating part 121 drives the blocking part 122 to move, the force on the blocking part 122 is more balanced, the movement of the blocking part 122 is more stable, and it will not skew. Similarly, when the blocking part 122 moves upward under the impact of exhaust, it can make the fit between the mating part 121 and the installation hole 102 more stable, and there will be no skew or jamming phenomenon. Exemplarily, the longitudinal cross-sectional shape of the valve core 12 is generally in a "T" shape. Such a setting makes the valve core 12 regular in shape, convenient for forming and manufacturing, and simplifies the process cost.

[0074] Furthermore, the blocking part 122 is coaxially arranged with the second exhaust port 301. With such a setting, the force on the blocking part 122 can be more balanced, and at the same time, the exhaust air flow is more evenly distributed when diffusing around, and a better noise reduction effect can be achieved.

[0075] In an embodiment of the present application, as shown in Figure 2 and Figure 3 , the blocking part 122 and the air passing hole 103 do not overlap in the axial direction of the back pressure plate 11.

[0076] When the compressor exhausts, the compressed high-pressure air flow flushes open the blocking part 122 to open the second exhaust port 301. In this embodiment, by setting the blocking part 122 and the air passing hole 103 not to overlap in the axial direction of the back pressure plate 11, even if the blocking part 122 is flushed to abut against the back pressure plate 11, it will not block the air passing hole 103. Thus, the air passing area of the air passing hole 103 can be ensured, and the exhaust flow rate can be ensured.

[0077] In an embodiment of the present application, as shown in Figure 8 , the outer diameter d1 of the mating part 121 and the outer diameter d2 of the blocking part 122 satisfy: 2 ≤ d2 / d1 ≤ 4.5.

[0078] It can be understood that the blocking part 122 is used to open or block the second exhaust port 301, so the outer diameter d2 of the blocking part 122 should be larger than the diameter of the second exhaust port 301. Taking the outer diameter d2 of the blocking part 122 as a reference, the outer diameter d1 of the matching part 121 should not be too large or too small. If the outer diameter d1 of the matching part 121 is too small, the overall structural strength of the valve core 12 may be insufficient and it is easy to deform; if the outer diameter d1 of the matching part 121 is too large, it will cause the aperture of the installation hole 102 with which it cooperates to be too large, the outer diameter of the installation part 111 to become larger, and further cause the air passing hole 103 to become smaller, failing to achieve the noise reduction effect. Based on this, in this embodiment, the relationship between the outer diameter d1 of the matching part 121 and the outer diameter d2 of the blocking part 122 is set to satisfy: 2 ≤ d2 / d1 ≤ 4.5. In this way, it can not only ensure that the structural strength will not deform, but also achieve a good noise reduction effect.

[0079] Optionally, the ratio of the outer diameter d2 of the blocking part 122 to the outer diameter d1 of the matching part 121 can be selected as 2, 2.5, 3, 3.5, 4 or 4.5, etc.

[0080] In an embodiment of the present application, as Figures 3 to 6 , the back pressure plate 11 further includes a plate body 112 and an annular boss 113. The plate body 112 is used to be installed with the compression assembly 3; the annular boss 113 is provided on the side of the plate body 112 facing away from the compression assembly 3 and encloses a first cavity 101 with the plate body 112; the annular boss 113 divides the plate body 112 into a central area and a peripheral area, and the installation part 111 and the air passing hole 103 are both arranged in the central area.

[0081] In this embodiment, the plate body 112 is installed on the compression assembly 3. Optionally, the plate body 112 can be fixed to the stationary scroll plate 31 by screws. The annular boss 113 is provided at one end of the plate body 112 facing away from the compression assembly 3 and extends in the direction of the partition plate 2, so that the annular boss 113 can enclose a first cavity 101 with the plate body 112. The annular boss 113 divides the plate body 112 into a central area and a peripheral area, and the installation part 111 and the air passing hole 103 are both arranged in the central area. It can be understood that the exhaust gas flow enters the first cavity 101 after passing through a number of air passing holes 103. Since the diameter of the first cavity 101 is larger than the aperture of the air passing hole 103, that is, the gas flow enters from a narrower channel into a wider channel, it can play a certain role in noise reduction and silencing, thus further improving the noise reduction effect.

[0082] In order to further improve the noise reduction effect, as Figures 3 to 6 , in an embodiment of the present application, it is defined that the total height of the back pressure plate 11 in the axial direction is H, and the height distance between the upper end surface of the annular boss 113 and the upper end surface of the central area is H1, satisfying: H1 ≥ 1 / 3H.

[0083] In this embodiment, the height distance H1 between the upper end surface of the annular boss 113 and the upper end surface of the central region can be understood as the height distance of the first cavity 101 in the axial direction. The height distance of the first cavity 101 should not be too small. If it is too small, the volume of the first cavity 101 is small and the noise reduction effect cannot be achieved. Based on this, in this embodiment, the height distance H1 between the upper end surface of the annular boss 113 and the upper end surface of the central region is set to be not less than the total height H of the back pressure plate 11 in the axial direction, that is, H1≥1 / 3H, so as to ensure that the first cavity 101 has a sufficiently large volume and achieve a better noise reduction effect.

[0084] In an embodiment of the present application, as Figures 3 to 6 , the inner diameter of the annular boss 113 is defined as D1, and the outer diameter of the plate body 112 is defined as D2, satisfying: 2≤D2 / D1≤5.

[0085] It can be understood that, as can be seen from the foregoing embodiments, the volume of the first cavity 101 should not be too small. If it is too small, the noise reduction effect cannot be achieved. Therefore, the inner diameter size of the first cavity 101 is limited in this embodiment. In this embodiment, by setting the relationship between the inner diameter D1 of the annular boss 113 and the outer diameter D2 of the plate body 112 to satisfy 2≤D2 / D1≤5, it can ensure that the first cavity 101 has a sufficiently large volume while also ensuring that the plate body 112 has sufficient space to install components such as a floating plate to ensure the back pressure effect of the back pressure assembly 1 on the stationary scroll disk 31.

[0086] In actual application, the relationship between the inner diameter D1 of the annular boss 113 and the outer diameter D2 of the plate body 112 is preferably 2≤D2 / D1≤4.

[0087] In an embodiment of the present application, a second cavity 104 is provided at one end of the plate body 112 facing away from the first cavity 101. The second cavity 104 is used to communicate the second exhaust port 301 with the air passing hole 103; the blocking portion 122 is located in the second cavity 104.

[0088] In this embodiment, by providing the second cavity 104 at one end of the plate body 112 facing away from the first cavity 101, that is, by providing cavities on both the upper and lower sides of the plate body 112, the air flow first enters the second cavity 104 after coming out of the second exhaust port 301 and then enters the first cavity 101 from the air passing hole 103, which can increase the flow area of the exhaust air flow and reduce noise.

[0089] In addition, the second cavity 104 can provide sufficient moving space for the blocking portion 122 to prevent gas backflow while ensuring exhaust.

[0090] Furthermore, as Figure 2 and Figure 3, the lift height of the plugging portion 122 is defined as H2, and the diameter of the second exhaust port 301 is D, satisfying: D / 4 ≤ H2 ≤ D / 2.

[0091] In this embodiment, the lift height H2 of the plugging portion 122 can be understood as the distance between the plane where the second exhaust port 301 is located and the lower surface of the plugging portion 122 when the plugging portion 122 moves to abut against the lower end surface of the plate body 112. The lift height H2 of the plugging portion 122 should not be too large or too small. If it is too small, when the plugging portion 122 opens the second exhaust port 301, the resistance of the plugging portion 122 to the exhaust air flow is relatively large, which will reduce the exhaust air flow; if it is too large, the first cavity 101 will be compressed, and a good noise reduction effect cannot be achieved. Based on this, in this embodiment, the relationship between the lift height H2 of the plugging portion 122 and the diameter D of the second exhaust port 301 is set to satisfy D / 4 ≤ H2 ≤ D / 2, which ensures the exhaust air flow while improving the noise reduction effect.

[0092] In an embodiment of the present application, as Figures 3 to 6 , the plate body 112 is provided with a plurality of air return holes 105 communicating the first cavity 101 and the second cavity 104, and the air return holes 105 and the plugging portion 122 at least partially overlap in the axial direction of the back pressure plate 11.

[0093] It can be understood that the mating portion 121 of the valve core 12 is installed in the installation hole 102, and when the compressor is running, lubricating oil in its inner cavity will be mixed in the exhaust air flow, and an oil film may be formed at the mating surface of the mating portion 121 and the installation hole 102. When the compressor stops running, the mating portion 121 and the installation hole 102 may not be able to normally fall back to the position of plugging the second exhaust port 301 due to the adhesion of the oil film. Therefore, in this embodiment, the plate body 112 is provided with a plurality of air return holes 105 communicating the first cavity 101 and the second cavity 104, and the plurality of air return holes 105 and the plugging portion 122 at least partially overlap in the axial direction of the back pressure plate 11, so that when the air flow returns, the air flow can directly act on the plugging portion 122 through the air return holes 105, so that the plugging portion 122 can fall back to plug the second exhaust port 301 and prevent the air flow from flowing back.

[0094] The present utility model also proposes a compressor, such as Figure 1 and Figure 2, the compressor includes a housing 4, a partition plate 2, a compression assembly 3 and a back pressure assembly 1. The specific structure of the back pressure assembly 1 refers to the above-mentioned embodiments. Since this compressor adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one. Among them, the partition plate 2 is arranged in the housing 4, and the partition plate 2 is provided with a first exhaust port 201; the compression assembly 3 includes a cooperating stationary scroll plate 31 and a moving scroll plate 32, and the stationary scroll plate 31 is provided with a second exhaust port 301; the back pressure assembly 1 is arranged between the stationary scroll plate 31 and the partition plate 2; the first cavity 101 is communicated with the first exhaust port 201, and the through hole 103 communicates the first cavity 101 with the second exhaust port 301.

[0095] This embodiment can improve the airflow pulsation and turbulent noise of the exhaust airflow through the above-mentioned back pressure assembly 1, thereby reducing the structural noise of the compressor caused by airflow impact and significantly improving its sound quality.

[0096] In an embodiment of the present application, the total gas passage area of several through holes 103 is larger than the gas passage area of the second exhaust port 301. Such a design can ensure the exhaust flow rate and prevent the back pressure assembly 1 from throttling the exhaust airflow.

[0097] In an embodiment of the present application, a second cavity 104 communicating with the second exhaust port 301 is formed between the back pressure plate 11 and the stationary scroll plate 31; the blocking portion 122 is movably located in the second cavity 104; the lift height of the blocking portion 122 is defined as H2, and the diameter of the second exhaust port 301 is D, satisfying: D / 4 ≤ H2 ≤ D / 2.

[0098] In this embodiment, the lift height H2 of the blocking portion 122 can be understood as the distance between the plane where the second exhaust port 301 is located and the lower surface of the blocking portion 122 when the blocking portion 122 moves to abut against the lower end surface of the plate body 112. The lift height H2 of the blocking portion 122 should not be too large or too small. If it is too small, when the blocking portion 122 opens the second exhaust port 301, the resistance of the blocking portion 122 to the exhaust airflow is large, which will reduce the exhaust flow rate; if it is too large, the first cavity 101 will be compressed, resulting in a poor noise reduction effect. Based on this, in this embodiment, the relationship between the lift height H2 of the blocking portion 122 and the diameter D of the second exhaust port 301 is set to satisfy D / 4 ≤ H2 ≤ D / 2, ensuring the exhaust flow rate while improving the noise reduction effect.

[0099] The present utility model also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiments. Since this refrigeration device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one. Optionally, the refrigeration device can be an air conditioner, a refrigerator, a cold chain transport vehicle, etc.

[0100] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. A back pressure assembly, characterized in that: Applied to a compressor, the compressor comprises a compression assembly and a partition plate, the partition plate is provided with a first exhaust port, the compression assembly is provided with a second exhaust port; the back pressure assembly comprises: A back pressure plate, used for being installed on the compression assembly, wherein the end of the back pressure plate facing away from the compression assembly is provided with a first cavity connected to the first exhaust port; the back pressure plate is provided with a mounting portion inside the first cavity, and the mounting portion is provided with a mounting hole; the back pressure plate is also provided with a plurality of air holes for connecting the first cavity and the second exhaust port, and the air holes are located between the mounting portion and the cavity peripheral wall of the first cavity; and The valve core comprises a matching portion and a blocking portion connected to each other, wherein the matching portion is movably mounted on the mounting hole, and the blocking portion is arranged on a side of the back pressure plate close to the compression assembly; the blocking portion can move away from or close to the compression assembly to open or block the second exhaust port; Wherein, the outer diameter d1 of the matching portion is smaller than the outer diameter d2 of the blocking portion.

2. The back pressure assembly according to claim 1, characterized in that: The matching portion is slidably matched with the mounting hole.

3. The back pressure assembly according to claim 2, characterized in that: The matching portion is connected to the blocking portion at an angle.

4. The back pressure assembly according to claim 3, characterized in that: The matching portion is vertically connected to the blocking portion.

5. The back pressure assembly according to any one of claims 1 to 4, characterized in that: The blocking portion and the air hole do not overlap in the axial direction of the back pressure plate.

6. The back pressure assembly according to any one of claims 1 to 4, characterized in that: The valve core is an integrated structure.

7. The back pressure assembly according to any one of claims 1 to 4, characterized in that: The outer diameter d1 of the matching portion and the outer diameter d2 of the blocking portion satisfy: 2≤d2 / d1≤4.

5.

8. The back pressure assembly according to any one of claims 1 to 4, characterized in that: The back pressure plate also includes: a plate body for mounting with the compression assembly; and an annular boss, disposed on a side of the plate body away from the compression assembly, and enclosing the plate body to form the first cavity; The annular boss divides the plate body into a central area and a peripheral area, and the mounting portion and the air holes are both arranged in the central area.

9. The back pressure assembly according to claim 8, characterized in that The total axial height of the back pressure plate is defined as H, and the height distance between the upper end surface of the annular boss and the upper end surface of the central area is defined as H1, satisfying: H1 ≥ 1 / 3H.

10. The back pressure assembly according to claim 8, characterized in that The inner diameter of the annular boss is defined as D1, and the outer diameter of the plate body is defined as D2, satisfying: 2≤D2 / D1≤5.

11. The back pressure assembly according to claim 8, characterized in that A second cavity is provided at one end of the plate body away from the first cavity, and the second cavity is used to connect the second exhaust port and the air hole; The blocking portion is located in the second cavity.

12. The back pressure assembly according to claim 11, characterized in that The plate body is provided with a plurality of air return holes communicating with the first cavity and the second cavity, and the air return holes and the blocking portion at least partially overlap in the axial direction of the back pressure plate.

13. The back pressure assembly according to any one of claims 1 to 4, characterized in that: There are a plurality of the air holes, and the plurality of the air holes are distributed at intervals around the periphery of the mounting portion.

14. A compressor, characterized in that: include: case; A partition plate is disposed in the shell, and the partition plate is provided with a first exhaust port; A compression assembly, comprising a fixed scroll and a movable scroll that cooperate with each other, wherein the fixed scroll is provided with a second exhaust port; and The back pressure assembly according to any one of claims 1 to 13 is arranged between the fixed scroll plate and the partition plate; the first cavity is connected to the first exhaust port, and the air hole is connected to the first cavity and the second exhaust port.

15. The compressor according to claim 14, characterized in that The total air passage area of ​​the plurality of air passage holes is greater than the air passage area of ​​the second exhaust port.

16. The compressor according to claim 14, characterized in that A second cavity communicating with the second exhaust port is formed between the back pressure plate and the fixed scroll, and the blocking portion is movably located in the second cavity; The lift height of the blocking portion is defined as H2, and the diameter of the second exhaust port is defined as D, satisfying: D / 4≤H2≤D / 2.

17. A refrigeration device, characterized in that: Comprising a compressor as claimed in any one of claims 14 to 16.

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