Compressor and vapor injection enthalpy increase structure therefor

Abstract

A vapor injection enthalpy increase structure for a compressor, and a compressor comprising the vapor injection enthalpy increase structure. The vapor injection enthalpy increase structure comprises: a main flow channel, which is connected to an intake port of a cylinder and delivers primary vapor into a chamber of the cylinder; a vapor injection port channel (1), one end of which is connected to the chamber of the cylinder; and a vapor injection flow channel (2), which is connected to the other end of the vapor injection port channel (1) and delivers vapor to be injected into the chamber of the cylinder by means of the vapor injection port channel (1). The minimum flow area of the vapor injection flow channel (2) is S1, and the minimum flow area of the main flow channel is S2, and the following condition is satisfied: 1%≤S1 / S2≤18%. By optimizing the design of the minimum flow areas of the vapor injection flow channel (2) and the main flow channel, flow regulation and control of the vapor injection flow channel (2) and the main flow channel can be achieved, and the capacity and performance advantages of a vapor injection compressor can be effectively brought into play, thereby improving the capacity and energy efficiency of the compressor, and ensuring the reliability of the compressor.

Description

Compressor and its air-supplying enthalpy-increasing structure Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an air-supplying and enthalpy-increasing structure of a compressor and a compressor comprising the air-supplying and enthalpy-increasing structure. Background Art

[0002] When the external ambient temperature is low, the operating pressure of the compressor is relatively high, and the capacity and energy efficiency of the compressor are seriously reduced. In order to improve the capacity and energy efficiency of the compressor, injection air supply is usually adopted. By introducing the refrigerant vapor after condensation throttling into the cylinder cavity, the refrigerant flow rate and suction temperature are increased, thereby improving the capacity and energy efficiency of the compressor. At present, the air supply compressor mainly uses the following two air supply methods to supply air to the cylinder cavity: one air supply method is to use the piston motion trajectory to control the opening and closing of the air supply flow path, and the other air supply method is to use a one-way valve (such as a ball valve, cone valve, spring valve, pressure valve, etc.) to control the opening and closing of the air supply flow path.

[0003] The above-mentioned air supply form can realize air supply to the compressor, but the following problems still exist: (1) The clearance volume increases. The existence of the air supply structure increases the additional clearance volume of the compressor, resulting in a decrease in the capacity and energy efficiency of the compressor. Under non-spraying conditions, the capacity and energy efficiency of the compressor decrease more significantly; (2) When using one-way valves such as ball valves and cone valves, the air supply flow path is relatively complex, the flow path pressure loss is large, and the one-way valve collides with the cylinder wall when it is frequently opened and closed during the operation of the compressor, resulting in risks to the reliability of use; (3) The improvement of the air supply capacity and air supply effect is not obvious, and the distribution of the air supply volume and the cylinder air intake volume is unreasonable, resulting in the air supply compressor capacity and energy efficiency cannot be normally exerted. The occurrence of air supply liquid spray will have an adverse effect on the reliability of the compressor.

[0004] Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an air-injection and enthalpy-increasing structure for a compressor, which is beneficial to improving the capacity and energy efficiency of the compressor.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides an air-supplementing and enthalpy-increasing structure for a compressor, comprising: a main flow channel, connected to the air inlet of a cylinder and conveying main air to the inner cavity of the cylinder; an air supply port channel, one end of which is connected to the inner cavity of the cylinder; a supplementary air flow channel, connected to the other end of the air supply port channel and conveying supplementary air to the inner cavity of the cylinder through the air supply port channel; the minimum flow area of ​​the supplementary air flow channel is S1, the minimum flow area of ​​the main flow channel is S2, and the following conditions are satisfied: 1%≤S1 / S2≤18%.

[0008] Preferably, 8%≤S1 / S2≤10%.

[0009] Preferably, 4%≤S1 / S2≤6%.

[0010] Preferably, the minimum flow area of ​​the air supply port channel is S3, and satisfies: 1%≤S3 / S1≤10%.

[0011] Preferably, 4%≤S3 / S1≤9%.

[0012] Preferably, 5%≤S3 / S1≤7%.

[0013] Preferably, a one-way valve for opening or closing the supplemental gas flow passage is provided on the supplemental gas flow passage.

[0014] Preferably, the one-way valve is a pressure valve.

[0015] Preferably, the supplementary air flow channel is provided on the middle plate, cylinder or bearing of the compressor.

[0016] The present invention also provides a compressor, comprising the air-supplying and enthalpy-increasing structure of the compressor as described above.

[0017] Compared with the prior art, the present invention has significant improvements:

[0018] The air-supply enthalpy-increasing structure of the compressor of the present invention optimizes the ratio of the minimum flow area S1 of the air-supply path channel to the minimum flow area S2 of the main flow path channel, that is, optimizes the minimum flow area S1 of the air-supply path channel and the minimum flow area S2 of the main flow path channel to satisfy the set S1 / S2 ratio range, thereby realizing flow control of the air-supply path channel and the main flow path channel, effectively contributing to the performance and performance advantages of the air-supply compressor, thereby improving the capacity and energy efficiency of the compressor and ensuring the reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of an air-injection and enthalpy-increasing structure of a compressor according to an embodiment of the present invention.

[0020] FIG2 is a schematic diagram showing the connection between the supplementary air flow channel and the supplementary air port channel in the supplementary air enthalpy increasing structure of the compressor according to an embodiment of the present invention.

[0021] FIG3 is a schematic diagram showing changes in the compressor COP with the S1 / S2 ratio in the air-compensating enthalpy-increasing structure of the compressor according to an embodiment of the present invention.

[0022] FIG4 is a schematic diagram showing changes in the cooling capacity of the compressor with the S1 / S2 ratio in the air-compensating and enthalpy-increasing structure of the compressor according to an embodiment of the present invention.

[0023] FIG5 is a schematic diagram showing changes in the COP of the compressor with the S3 / S1 ratio in the air-compensating and enthalpy-increasing structure of the compressor according to an embodiment of the present invention.

[0024] FIG6 is a schematic diagram showing the change in the cooling capacity of the compressor with the S3 / S1 ratio in the air-compensating and enthalpy-increasing structure of the compressor according to an embodiment of the present invention.

[0025] 7 is a cross-sectional schematic diagram of an air supply flow channel provided on a middle plate in an air supply and enthalpy increase structure of a compressor according to an embodiment of the present invention.

[0026] FIG8 is a schematic diagram of a compressor of an embodiment of the present invention in which a one-way valve of an air-injection and enthalpy-increasing structure adopts a pressure valve and performs air injection in a double-valve form.

[0027] FIG9 is a schematic diagram of a compressor of an embodiment of the present invention, in which the one-way valve of the air-injection and enthalpy-increasing structure adopts a pressure valve and performs air injection in a single valve form.

[0028] The reference numerals are described as follows: 1 Air supply port channel 2 Air supply flow channel 3 One-way valve 31 Valve plate 32 Valve plate baffle 33 Rivet 4 Structural member 41 Valve plate groove DETAILED DESCRIPTION

[0029] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0033] As shown in FIG1 to FIG9 , an embodiment of the air-supplying and enthalpy-increasing structure of a compressor provided by the present invention is shown.

[0034] 1 and 2 , the air-supplying and enthalpy-increasing structure of the compressor of this embodiment includes: a main flow channel (not shown in the figures), an air-supplying port channel 1 and an air-supplying flow channel 2 .

[0035] Among them, the main flow channel is connected and communicated with the air inlet of the compressor cylinder, and the main flow channel transports the main gas to the inner cavity of the cylinder. The main gas is the refrigerant after condensation throttling, which is input into the inner cavity of the cylinder and compressed by the compression structure in the cylinder. Usually, the main gas sent into the inner cavity of the cylinder for compression in the compressor comes from the evaporator, and a liquid reservoir is provided between the evaporator and the cylinder for collecting the liquid refrigerant in the refrigerant coming out of the evaporator. The main flow channel in this embodiment is the main gas flow path between the inner tube of the liquid reservoir and the air inlet of the cylinder, which is used to transport the main gas entering the liquid reservoir from the evaporator to the inner cavity of the cylinder, and the main gas directly enters the inner cavity of the cylinder from the air inlet of the cylinder for compression. The main flow channel has a minimum flow area S2, and the minimum flow area of ​​the main flow channel is also the minimum cross-sectional area of ​​the main flow channel.

[0036] The supplementary air inlet channel 1 is provided at the inner cavity wall of the cylinder. One end of the supplementary air inlet channel 1 is connected to and communicates with the inner cavity of the cylinder. The supplementary air flow path channel 2 is connected to and communicates with the other end of the supplementary air inlet channel 1. The supplementary air flow path channel 2 transports supplementary air to the inner cavity of the cylinder through the supplementary air inlet channel 1. That is, the supplementary air is transported from the supplementary air flow path channel 2 to the inner cavity of the cylinder. The end of the supplementary air flow path channel 2 is connected to the supplementary air inlet channel 1, so that the supplementary air input into the supplementary air flow path channel 2 enters the supplementary air inlet channel 1 and is ejected into the inner cavity of the cylinder through the supplementary air inlet channel 1. The supplementary air is also the refrigerant after condensation throttling. In this embodiment, the supplementary air flow path channel 2 is the supplementary air path from the source of the supplementary air refrigerant to the supplementary air inlet channel 1. The supplementary air inlet channel 1 refers to the jet flow path from the end of the supplementary air flow path channel 2 to the inner cavity of the cylinder. The supplementary air flow path channel 2 is a flow channel that can be opened or closed and can be opened when needed to transport supplementary air to the inner cavity of the cylinder. The supplementary gas flow channel 2 has a minimum flow area S1, which is also the minimum cross-sectional area of ​​the supplementary gas flow channel 2. The supplementary gas port channel 1 has a minimum flow area S3, which is also the minimum cross-sectional area of ​​the supplementary gas port channel 1.

[0037] The refrigerant flow rate in the main flow channel, the air supply port channel 1 and the air supply port channel 2 is related to the flow area of ​​each channel, especially the minimum flow area. By adjusting the ratio of the minimum flow area S1 of the air supply port channel 2, the minimum flow area S2 of the main flow channel and the minimum flow area S3 of the air supply port channel 1, the capacity and energy efficiency of the compressor under the air supply working condition can be controlled to be within a better range.

[0038] In this embodiment, the ratio of the minimum flow area S1 of the supplementary air flow channel 2 to the minimum flow area S2 of the main flow channel is set within the range of 1%-18%, that is, 1%≤S1 / S2≤18%, thereby effectively improving the capacity and energy efficiency of the compressor. Preferably, the ratio of the minimum flow area S1 of the supplementary air flow channel 2 to the minimum flow area S2 of the main flow channel is set within the range of 8%-10%, that is, 8%≤S1 / S2≤10%, thereby maximizing the capacity and energy efficiency of the compressor. Preferably, the ratio of the minimum flow area S1 of the supplementary air flow channel 2 to the minimum flow area S2 of the main flow channel is set within the range of 4%-6%, that is, 4%≤S1 / S2≤6%, at which point the energy efficiency of the compressor is optimal.

[0039] Figure 3 shows the change of compressor COP (Coefficient of Performance) with the S1 / S2 ratio. Figure 4 shows the change of compressor cooling capacity with the S1 / S2 ratio.

[0040] The air-supply enthalpy-increasing structure of the compressor of this embodiment optimizes the ratio of the minimum flow area S1 of the air-supply path channel 2 to the minimum flow area S2 of the main flow path channel, that is, optimizes the minimum flow area S1 of the air-supply path channel 2 and the minimum flow area S2 of the main flow path channel to satisfy the set S1 / S2 ratio range, thereby realizing flow control of the air-supply path channel 2 and the main flow path channel, effectively contributing to the performance and performance advantages of the air-supply compressor, thereby improving the capacity and energy efficiency of the compressor and ensuring the reliability of the compressor.

[0041] After the air supply channel 2 is opened, it connects to the air supply port channel 1. The air supply refrigerant inputted through the air supply port channel 2 flows into the cylinder's inner cavity through the air supply port channel 1 for compression. If the flow area of ​​the air supply port channel 1 is set too small, the air supply refrigerant may be throttled, resulting in pressure loss and air supply liquid carryover. If the flow area of ​​the air supply port channel 1 is set too large, it not only increases the clearance volume of the compressor but may also cause crossflow between the compressor's suction chamber and compression chamber. Therefore, a suitable flow area of ​​the air supply port channel 1 is beneficial to the energy efficiency of the compressor.

[0042] The air-supply enthalpy-increasing structure of the compressor of this embodiment further sets the ratio of the minimum flow area S3 of the air-supply port channel 1 to the minimum flow area S1 of the air-supply flow path channel 2 within the range of 1%-10%, that is, 1%≤S3 / S1≤10%. In this way, the minimum flow area S3 of the air-supply port channel 1 is further optimized, which can effectively achieve the purpose of reducing refrigerant pressure loss, reducing clearance volume, and improving compressor performance. Preferably, the ratio of the minimum flow area S3 of the air-supply port channel 1 to the minimum flow area S1 of the air-supply flow path channel 2 is set within the range of 4%-9%, that is, 4%≤S3 / S1≤9%, which can maximize the capacity and energy efficiency of the compressor. More preferably, the ratio of the minimum flow area S3 of the air-supply port channel 1 to the minimum flow area S1 of the air-supply flow path channel 2 is set within the range of 5%-7%, that is, 5%≤S3 / S1≤7%, at which time the capacity and energy efficiency of the compressor are optimized.

[0043] Figure 5 shows the variation of compressor COP (Coefficient of Performance) with the S3 / S1 ratio. Figure 6 shows the variation of compressor cooling capacity with the S3 / S1 ratio.

[0044] In the compressor's air-injection and heat-increasing structure of this embodiment, air-injection channel 2 is provided on structural member 4. Structural member 4 can be any component or structure in the compressor capable of providing a flow channel leading to the cylinder cavity, including but not limited to an intermediate plate, cylinder, or bearing of the compressor. For example, Figure 7 shows a cross-sectional schematic diagram of an embodiment in which air-injection channel 2 is provided on the intermediate plate (i.e., structural member 4 is the intermediate plate).

[0045] The air supply and enthalpy-increasing structure of the compressor of this embodiment is preferably provided with a one-way valve 3 on the air supply passage 2 for opening or closing the air supply passage 2. The one-way valve 3 is preferably a pressure valve, which can make the structure of the air supply passage 2 relatively simple, reduce the pressure loss of the air supply passage 2, and ensure the reliability of use. Of course, the one-way valve 3 used to open or close the air supply passage 2 is not limited to a pressure valve, and other forms of one-way valves can also be used, such as a ball valve, a spring valve or a cone valve. The air supply passage 2 can supply air to the inner cavity of the two-stage cylinder of the compressor in a double-valve double-supply form through two one-way valves, or can supply air to the inner cavity of the first-stage cylinder of the compressor in a single-valve single-supply form through one one-way valve, or can supply air to the inner cavity of the two-stage cylinder of the compressor in a single-valve double-supply form through one one-way valve.

[0046] Taking the example of a one-way valve 3 employing a pressure valve and a structural member 4 serving as a compressor intermediate plate, see Figures 8 and 9, which illustrate dual-valve and single-valve configurations, respectively. The pressure valve's valve disc 31 is positioned at the end of the supplemental gas flow passage 2. The structural member 4, which houses the supplemental gas flow passage 2, has a valve disc slot 41 at the end. The pressure valve's valve disc 31 is mounted within this slot and secured by a valve disc retainer 32 and rivets 33. External force pushes the valve disc 31 to rotate, causing it to move away from or cover the end of the supplemental gas flow passage 2, thereby opening or closing the supplemental gas flow passage 2.

[0047] Based on the above-mentioned air-compensating and enthalpy-increasing structure of the compressor, an embodiment of the present invention further provides a compressor. The compressor of this embodiment includes the above-mentioned air-compensating and enthalpy-increasing structure of the compressor of this embodiment.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A compressor air-injection and enthalpy-increasing structure, characterized in that: include: a main flow channel connected to the air inlet of the cylinder and conveying main air to the inner cavity of the cylinder; An air supply port channel, one end of which is connected to the inner cavity of the cylinder; a supplementary air flow passage, connected to the other end of the supplementary air port passage and conveying supplementary air to the inner cavity of the cylinder through the supplementary air port passage; The minimum flow area of ​​the supplementary gas flow channel is S1, the minimum flow area of ​​the main flow channel is S2, and they satisfy: 1%≤S1 / S2≤18%.

2. The air-injection and enthalpy-increasing structure of the compressor according to claim 1, characterized in that: 8%≤S1 / S2≤10%.

3. The air-supplying and enthalpy-increasing structure of the compressor according to claim 1, characterized in that: 4%≤S1 / S2≤6%.

4. The air-supplying and enthalpy-increasing structure of the compressor according to any one of claims 1 to 3, characterized in that: The minimum flow area of ​​the air supply port channel is S3, and satisfies: 1%≤S3 / S1≤10%.

5. The air-supplying and enthalpy-increasing structure of the compressor according to claim 4, characterized in that: 4%≤S3 / S1≤9%.

6. The air-injection and enthalpy-increasing structure of the compressor according to claim 5, characterized in that: 5%≤S3 / S1≤7%.

7. The air-supplying and enthalpy-increasing structure of the compressor according to claim 1, characterized in that: The supplementary air flow passage is provided with a one-way valve for opening or closing the supplementary air flow passage.

8. The air-supplying and enthalpy-increasing structure of the compressor according to claim 7, characterized in that: The one-way valve is a pressure valve.

9. The air-supplying and enthalpy-increasing structure of the compressor according to claim 1, characterized in that: The air supply passage is arranged on the compressor cylinder or the bearing.

10. The air-supplying and enthalpy-increasing structure of the compressor according to claim 1, characterized in that: The main flow channel is a main air flow path from the inner tube of the liquid reservoir to the air inlet, and is used to transport the main air entering the liquid reservoir from the evaporator to the inner cavity of the cylinder.

11. The air-supplying and enthalpy-increasing structure of the compressor according to claim 7, characterized in that: The one-way valve is a ball valve, a spring valve or a cone valve.

12. The air-supplying and enthalpy-increasing structure of the compressor according to claim 7, characterized in that: When the cylinder is a two-stage cylinder, the air supply passageway supplies air to the inner cavities of the two-stage cylinders respectively through two one-way valves in a double-valve double-supply form, or supplies air to the inner cavities of the two-stage cylinders respectively through one one-way valve in a single-valve double-supply form.

13. The air-supplying and enthalpy-increasing structure of the compressor according to claim 7, characterized in that: When the cylinder is a first-stage cylinder, the air supply passageway supplies air to the inner cavity of the first-stage cylinder in a single-valve single-supply manner through one of the one-way valves.

14. The air-supplying and enthalpy-increasing structure of the compressor according to claim 8, characterized in that: The air supply passage is provided on the middle plate of the compressor.

15. The air-supplying and enthalpy-increasing structure of the compressor according to claim 14, characterized in that: The intermediate plate is provided with a valve plate groove at the end position of the supplementary air flow path, and the valve plate of the pressure valve is installed in the valve plate groove. The valve plate is pushed to rotate by external force to leave or cover the end of the supplementary air flow path, thereby realizing the opening or closing of the supplementary air flow path.

16. The air-supplying and enthalpy-increasing structure of the compressor according to claim 15, characterized in that: The valve plate is fixed in the valve plate groove by a valve plate baffle and rivets.

17. A compressor, characterized in that: The air-supplementing and enthalpy-increasing structure of the compressor comprises the structure described in any one of claims 1 to 16.

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