A three-cylinder gas-injection enthalpy-increasing compressor, refrigeration cycle system and air conditioner

Abstract

The utility model provides a kind of three cylinder air supplementing enthalpy increasing compressor, refrigeration cycle system and air conditioner, three cylinder air supplementing enthalpy increasing compressor includes: two-stage compression unit and single-stage compression unit, single-stage compression unit includes single-stage cylinder, further include first suction pipe, second suction pipe and air supplementing pipe, first suction pipe is communicated with the suction port of primary cylinder, to suck low-pressure refrigerant from the outside of compressor, second suction pipe is communicated with the suction port of single-stage cylinder, to suck low-pressure refrigerant from the outside of compressor, air supplementing pipe can be communicated with two-stage cylinder respectively, and with single-stage cylinder, to air supplement two-stage cylinder, and air supplement single-stage cylinder. According to the utility model, the problem that the air supplementing enthalpy effect is not good due to the uneven air supplementing pressure and air supplementing amount caused by using two air supplementing pipes to air supplement two-stage compression cylinder and single-stage compression cylinder respectively in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, specifically to a three-cylinder air-injection enthalpy-increasing compressor, a refrigeration cycle system, and an air conditioner. Background Technology

[0002] In the prior art, CN 207297357 U discloses a rotary compressor that employs a single-stage compression cylinder and a two-stage compression cylinder. The single-stage compression cylinder has a single-stage compression chamber, a single-stage intake port, and a single-stage exhaust port. The two-stage compression cylinder includes a first-stage compression cylinder and a second-stage compression cylinder. The first-stage compression cylinder has a first-stage compression chamber and a first intake port, and the second-stage compression cylinder has a second-stage compression chamber and a first exhaust port. The compression mechanism is provided with a mixing chamber connecting the first-stage compression chamber and the second-stage compression chamber and a first jet flow path communicating with the mixing chamber. The first-stage compression cylinder can be switched between a cylinder-off operation state and a cylinder-free operation state.

[0003] However, this patent uses two separate air supply pipes to supply air to the second-stage compression cylinder and the single-stage compression cylinder, resulting in uneven air supply pressure and volume. This prevents the dual-stage or single-stage compression unit from reaching the optimal air supply state, resulting in poor enthalpy enhancement effect and limiting the overall cooling and heating capacity of the compressor. Furthermore, the external structure is complex.

[0004] Because existing three-cylinder gas-injection enthalpy-enhancing compressors have technical problems such as using two separate gas injection pipes to inject gas into the second-stage compression cylinder and the single-stage compression cylinder, resulting in uneven gas injection pressure and volume, which leads to poor gas injection enthalpy enhancement effect, this utility model studies and designs a three-cylinder gas-injection enthalpy-enhancing compressor, a refrigeration cycle system, and an air conditioner. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defects of the existing three-cylinder gas-injection enthalpy-enhancing compressor, which uses two gas injection pipes to inject gas into the second-stage compression cylinder and the single-stage compression cylinder respectively, resulting in uneven gas injection pressure and gas injection volume, which leads to poor gas injection enthalpy enhancement effect. Thus, this utility model provides a three-cylinder gas-injection enthalpy-enhancing compressor, a refrigeration cycle system and an air conditioner.

[0006] To solve the above problems, this utility model provides a three-cylinder inlet gas enthalpy-increasing compressor, which includes: The system includes a two-stage compression unit and a single-stage compression unit. The two-stage compression unit comprises a primary cylinder and a secondary cylinder, with the primary cylinder and the secondary cylinder connected in series to form the two-stage compression unit. The single-stage compression unit comprises a single-stage cylinder. The three-cylinder gas-injection enthalpy-increasing compressor further includes a first suction pipe, a second suction pipe, and a gas-injection pipe. The first suction pipe is connected to the suction port of the first-stage cylinder to draw in low-pressure refrigerant from outside the compressor. The second suction pipe is connected to the suction port of the single-stage cylinder to draw in low-pressure refrigerant from outside the compressor. The gas-injection pipe can be connected to the second-stage cylinder and the single-stage cylinder respectively to inject gas into the second-stage cylinder and the single-stage cylinder.

[0007] In some implementations... It also includes a housing, in which both the dual-stage compression unit and the single-stage compression unit are disposed. A middle partition and an upper partition are provided between the first-stage cylinder and the second-stage cylinder. A medium-pressure mixing chamber is provided between the middle partition and the upper partition. The exhaust port of the first-stage cylinder is connected to the medium-pressure mixing chamber. The medium-pressure mixing chamber is also connected to the intake port of the second-stage cylinder. An enthalpy-increasing channel is also provided on the first-stage cylinder. One end of the air supply pipe after passing through the housing is connected to the enthalpy-increasing channel. The enthalpy-increasing channel can be connected to the medium-pressure mixing chamber and the interior of the single-stage cylinder, respectively.

[0008] In some implementations... The primary cylinder is also provided with a dual-stage air supply channel one, and the middle partition is also provided with a dual-stage air supply channel two. One end of the dual-stage air supply channel one extends into the interior of the primary cylinder to communicate with the enthalpy-increasing channel, and the other end of the dual-stage air supply channel one extends to the axial end face connected to the middle partition. One end of the dual-stage air supply channel two extends to communicate with the medium-pressure mixing chamber, and the other end of the dual-stage air supply channel two extends to the axial end face connected to the primary cylinder, so that the dual-stage air supply channel two is opposite to and connected to the dual-stage air supply channel one. The enthalpy-increasing channel, the dual-stage air supply channel one, the dual-stage air supply channel two, and the medium-pressure mixing chamber form a sequentially connected passage.

[0009] In some implementations... A lower partition is provided between the first-stage cylinder and the single-stage cylinder. A single-stage air supply channel one is also provided on the first-stage cylinder. A single-stage air supply channel two is also provided on the lower partition. A single-stage air supply channel three is also provided on the single-stage cylinder. One end of the single-stage air supply channel one extends into the interior of the first-stage cylinder to communicate with the enthalpy-increasing channel. The other end of the single-stage air supply channel one extends to the axial end face connected to the lower partition. One end of the single-stage air supply channel two extends to the axial end face connected to the first-stage cylinder to communicate with the single-stage air supply channel one. The other end of the single-stage air supply channel two extends to the axial end face connected to the single-stage cylinder to communicate with the single-stage air supply channel three. This allows the enthalpy-increasing channel, the single-stage air supply channel one, the single-stage air supply channel two, and the single-stage air supply channel three to form a sequentially connected passage. The single-stage air supply channel three communicates with the compression chamber of the single-stage cylinder.

[0010] In some implementations... The single-stage cylinder is also equipped with a check valve and a back pressure channel. The third single-stage air supply channel is located on the axial side end face of the single-stage cylinder facing the lower partition. The check valve is located at the intersection of the third single-stage air supply channel and the back pressure channel. One end of the back pressure channel can communicate with the exhaust port of the single-stage cylinder, and the other end can communicate with one side of the check valve. The other side of the check valve is opposite to the second single-stage air supply channel. When the pressure in the second single-stage air supply channel is greater than the pressure in the back pressure channel, the check valve opens the third single-stage air supply channel to supply air to the inside of the single-stage cylinder.

[0011] In some implementations... It also includes an air-suction separator, one end of the first air-suction tube is connected to the interior of the air-suction separator and the other end is connected to the air-suction port of the first-stage cylinder, and one end of the second air-suction tube is also connected to the interior of the air-suction separator and the other end is connected to the air-suction port of the single-stage cylinder.

[0012] In some implementations... The exhaust port of the second-stage cylinder is connected to the interior of the housing, and the exhaust of the single-stage cylinder is also connected to the interior of the housing; It also includes a lower flange having a receiving cavity that communicates with the exhaust port of the single-stage cylinder and with the interior of the housing.

[0013] In some implementations... It also includes a gas-liquid separator, which is located outside the housing, and one end of the gas-injection pipe that extends out of the housing is connected to the gas-liquid separator.

[0014] This utility model also provides a refrigeration cycle system, which includes the aforementioned three-cylinder gas-injection enthalpy-increasing compressor, and further includes an evaporator, a condenser, a flash evaporator, a first-stage throttling device and a second-stage throttling device. The exhaust port of the compressor is connected to the condenser through an exhaust pipe, and the flash evaporator is connected to the gas-injection liquid separator through the gas-injection pipe.

[0015] This utility model also provides an air conditioner, which includes the aforementioned refrigeration cycle system.

[0016] The three-cylinder air-injection enthalpy-increasing compressor, refrigeration cycle system, and air conditioner provided by this utility model have the following beneficial effects: This invention utilizes a combined pump structure of a two-stage compression unit and a single-stage compression unit. Both the single-stage and first-stage cylinders draw low-pressure refrigerant from outside the compressor for compression. A supplementary gas pipe allows for separate gas supply to the second-stage and single-stage cylinders, simultaneously supplying gas to both the intermediate chamber of the two-stage compression unit and the compression chamber of the single-stage compression unit. This design ensures optimal volumetric efficiency for the two-stage compressor unit, guaranteeing energy efficiency under low-pressure-ratio conditions (normal operating conditions). Simultaneously, it ensures uniformity in the gas supply pressure and volume to the single-stage and second-stage cylinders, effectively improving the enthalpy enhancement effect of gas supply to multiple cylinders and further enhancing the compressor's cooling and heating capabilities. This effectively solves the problem in existing three-cylinder gas-supply enthalpy-enhancing compressors where two separate gas supply pipes are used for supplying gas to the second-stage and single-stage cylinders, resulting in uneven gas supply pressure and volume and poor enthalpy enhancement. Attached Figure Description

[0017] Figure 1 This is a longitudinal sectional view of the three-cylinder air-injection enthalpy-increasing compressor of this utility model; Figure 2 yes Figure 1 A longitudinal sectional view of the pump body section; Figure 3 yes Figure 1 Working principle diagram of the pump body; Figure 4 yes Figure 2 A schematic diagram (half-section) of the gas replenishment and enthalpy-increasing channel structure of the pump body. Figure 5 yes Figure 2 A schematic diagram of the refrigerant flow direction in the two-stage enthalpy-increasing section of the pump body; Figure 6 yes Figure 2 A schematic diagram of the refrigerant flow direction in the single-stage enthalpy-increasing section of the pump body; Figure 7 This is a system diagram of the refrigeration cycle system of this utility model; Figure 8This is a bar chart comparing the cooling capacity of this utility model with that of the background technology patent.

[0018] The reference numerals in the attached figures are as follows: 1. First-stage cylinder; 2. Second-stage cylinder; 3. Single-stage cylinder; 4. First intake pipe; 5. Second intake pipe; 6. Air replenishment pipe; 7. Two-stage air replenishment channel one; 8. Housing; 9. Intake separator; 10. Air replenishment separator; 11. Two-stage air replenishment channel two; 12. Middle partition; 13. Upper partition; 14. Medium-pressure mixing chamber; 15. Enthalpy-increasing channel; 16. Lower partition; 17. Single-stage air replenishment channel one; 18. Lower flange; 19. Receiving cavity; 20. 21. Evaporator; 22. Condenser; 23. Flash evaporator; 24. Primary throttling device; 25. Secondary throttling device; 26. Single-stage gas supply channel II; 27. Check valve; 28. Back pressure channel; 29. ​​Single-stage gas supply channel III; 30. Motor; 31. Crankshaft; 32. Silencer; 33. Upper flange; 34. Check valve I; 15. Check valve II; 101. Exhaust pipe; 102. Gas supply pipe; 100. Pump body; 200. Compressor. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0023] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0025] like Figure 1-8 As shown, this utility model provides a three-cylinder inlet gas enthalpy-increasing compressor, which includes: The system includes a two-stage compression unit and a single-stage compression unit. The two-stage compression unit comprises a primary cylinder 1 and a secondary cylinder 2, which are connected in series to form the two-stage compression unit. The single-stage compression unit comprises a single-stage cylinder 3. The three-cylinder gas-injection enthalpy-increasing compressor further includes a first suction pipe 4, a second suction pipe 5, and a gas-injection pipe 6. The first suction pipe 4 is connected to the suction port of the first-stage cylinder 1 to draw in low-pressure refrigerant from outside the compressor (here, "low pressure" refers to refrigerant with a relatively low pressure relative to the "high pressure" of the compressor exhaust, and refrigerant with a relatively low pressure relative to the "medium-pressure gas injection" of the compressor). The second suction pipe 5 is connected to the suction port of the single-stage cylinder 3 to draw in low-pressure refrigerant from outside the compressor. The gas-injection pipe 6 can be connected to the second-stage cylinder 2 to inject gas into the second-stage cylinder 2, and to the single-stage cylinder 3 to inject gas into the single-stage cylinder 3.

[0026] This invention utilizes a combined pump structure of a two-stage compression unit and a single-stage compression unit. Both the single-stage and first-stage cylinders draw low-pressure refrigerant from outside the compressor for compression. A supplementary gas pipe allows for separate gas supply to the second-stage and single-stage cylinders, simultaneously supplying gas to both the intermediate chamber of the two-stage compression unit and the compression chamber of the single-stage compression unit. This design ensures optimal volumetric efficiency for the two-stage compressor unit, guaranteeing energy efficiency under low-pressure-ratio conditions (normal operating conditions). Simultaneously, it ensures uniformity in the gas supply pressure and volume to the single-stage and second-stage cylinders, effectively improving the enthalpy enhancement effect of gas supply to multiple cylinders and further enhancing the compressor's cooling and heating capabilities. This effectively solves the problem in existing three-cylinder gas-supply enthalpy-enhancing compressors where two separate gas supply pipes are used for supplying gas to the second-stage and single-stage cylinders, resulting in uneven gas supply pressure and volume and poor enthalpy enhancement.

[0027] For a three-cylinder enthalpy-increasing compressor with gas injection, due to the limited displacement of the high-pressure cylinder, this invention proposes a novel rotary two-stage enthalpy-increasing compressor. By introducing a single-stage cylinder, the total displacement can be expanded. The pump body consists of a two-stage compression unit and a single-stage compression unit, employing a single-channel gas injection system to provide uniform gas injection pressure and volume to both units. Under normal operating conditions, the synchronous operation of the single-stage cylinder increases the intake volume, expanding the displacement requirement. Under low-temperature conditions, the single-stage cylinder simultaneously performs intake and gas injection, improving the output capacity under these conditions.

[0028] This invention provides a three-cylinder enthalpy-increasing compressor with air injection. The compressor includes a two-stage enthalpy-increasing section and a single-stage enthalpy-increasing section, with the two sections operating in parallel. It combines the advantages of both two-stage and single-stage enthalpy-increasing compressors, and can simultaneously balance capacity and energy efficiency under various operating conditions to meet user needs.

[0029] In some implementations... It also includes a housing 8, in which both the dual-stage compression unit and the single-stage compression unit are disposed. A middle partition 12 and an upper partition 13 are disposed between the first-stage cylinder 1 and the second-stage cylinder 2. A medium-pressure mixing chamber 14 is provided between the middle partition 12 and the upper partition 13. The exhaust port of the first-stage cylinder 1 is connected to the medium-pressure mixing chamber 14. The medium-pressure mixing chamber 14 is also connected to the intake port of the second-stage cylinder 2. An enthalpy-increasing channel 15 is also provided on the first-stage cylinder 1. One end of the air supply pipe 6 after passing through the housing 8 is connected to the enthalpy-increasing channel 15. The enthalpy-increasing channel 15 can be connected to the medium-pressure mixing chamber 14 and the interior of the single-stage cylinder 3, respectively.

[0030] The aforementioned housing of this utility model serves as the exhaust inlet chamber for both the dual-stage compression unit and the single-stage compression unit, allowing the gas compressed by the single-stage cylinder to enter the housing, and the gas compressed by the dual-stage cylinder to also enter the housing, where they are mixed before being discharged as a whole. This invention also forms a medium-pressure mixing chamber through the aforementioned middle and upper partitions, which can accommodate the exhaust gas from the first-stage cylinder and the gas supplied by the air supply pipe. After being mixed evenly, the gas enters the second-stage cylinder as a whole, thus improving the stability of the gas. The enthalpy-increasing channel on the first-stage cylinder can form a channel connected to the air supply pipe for supplying gas to the medium-pressure mixing chamber.

[0031] Figure 3 This is a schematic diagram of the working principle of the pump body of this utility model, as shown below. Figure 3 As shown, the pump body includes a two-stage enthalpy-increasing section and a single-stage enthalpy-increasing section, which work in parallel. The low-pressure refrigerant from the distributor component and the medium-pressure refrigerant from the enthalpy-increasing component simultaneously enter the two-stage enthalpy-increasing section and the single-stage enthalpy-increasing section. In the two-stage enthalpy-increasing section, the enthalpy-increasing component supplies medium-pressure refrigerant to the medium-pressure chamber of the two-stage enthalpy-increasing section to form back pressure in the first-stage cylinder. The first-stage cylinder draws in low-pressure refrigerant from the distributor component, compresses it, and discharges medium-pressure refrigerant into the medium-pressure chamber. This portion of refrigerant mixes with the medium-pressure refrigerant supplied by the enthalpy-increasing component to form mixed medium-pressure refrigerant. Subsequently, the second-stage cylinder draws in the mixed medium-pressure refrigerant and performs secondary compression to form high-pressure refrigerant, which is then discharged from the pump body and enters the compressor housing. In the single-stage enthalpy-increasing section, the low-pressure refrigerant from the distributor component and the medium-pressure refrigerant supplied by the enthalpy-increasing component simultaneously enter the single-stage enthalpy-increasing cylinder to mix and form mixed refrigerant. The single-stage enthalpy-increasing cylinder compresses the mixed refrigerant to form high-pressure refrigerant, which is then discharged from the pump body and enters the compressor housing.

[0032] In some implementations... The first-stage cylinder 1 is also provided with a dual-stage air supply channel 7, and the middle partition 12 is also provided with a dual-stage air supply channel 2 11. One end of the dual-stage air supply channel 7 extends into the interior of the first-stage cylinder 1 to communicate with the enthalpy-increasing channel 15, and the other end of the dual-stage air supply channel 7 extends to the axial end face connected to the middle partition 12. One end of the dual-stage air supply channel 2 11 extends to communicate with the medium-pressure mixing chamber 14, and the other end of the dual-stage air supply channel 2 11 extends to the axial end face connected to the first-stage cylinder 1, so that the dual-stage air supply channel 2 11 is opposite to and connected to the dual-stage air supply channel 7. The enthalpy-increasing channel 15, the dual-stage air supply channel 7, the dual-stage air supply channel 2 11, and the medium-pressure mixing chamber 14 form a sequentially connected passage.

[0033] This is a preferred structural form of the dual-stage air supply channel of this utility model. By setting dual-stage air supply channels one and two on the first-stage cylinder and the middle partition respectively, a connecting channel can be formed between the enthalpy-increasing channel and the medium-pressure mixing chamber, thereby realizing the function and effect of air supply to the medium-pressure mixing chamber, and providing conditions for further air supply to the second-stage cylinder of the dual-stage compression unit.

[0034] In some implementations... A lower partition 16 is provided between the first-stage cylinder 1 and the single-stage cylinder 3. A single-stage air supply channel 17 is also provided on the first-stage cylinder 1. A second single-stage air supply channel 25 is also provided on the lower partition 16. A third single-stage air supply channel 28 is also provided on the single-stage cylinder 3. One end of the first single-stage air supply channel 17 extends into the interior of the first-stage cylinder 1 to communicate with the enthalpy-increasing channel 15. The other end of the first single-stage air supply channel 17 extends to the axial end face connected to the lower partition 16. One end of the second stage air supply channel 25 extends to the axial end face connected to the first stage cylinder 1 to communicate with the first stage air supply channel 17. The other end of the second stage air supply channel 25 extends to the axial end face connected to the first stage cylinder 3 to communicate with the third stage air supply channel 28. This allows the enthalpy-increasing channel 15, the first stage air supply channel 17, the second stage air supply channel 25, and the third stage air supply channel 28 to form a sequentially connected passage. The third stage air supply channel 28 is connected to the compression chamber of the first stage cylinder 3.

[0035] This is a preferred structural form of the single-stage air replenishment channel of this utility model. By setting single-stage air replenishment channels one, two and three on the first-stage cylinder, the lower partition and the single-stage cylinder respectively, a connecting channel between the enthalpy-increasing channel and the single-stage cylinder can be formed, thereby realizing the function and effect of replenishing air to the single-stage cylinder, and providing conditions for further replenishment of air to the single-stage compression unit.

[0036] Figure 4 This is a schematic diagram of the gas replenishment and enthalpy increase channel of the pump body of this utility model, as shown below. Figure 4 As shown, the two-stage enthalpy-increasing cylinder has a two-stage air supply channel one, and a two-stage air supply channel two is set on the middle partition plate, together forming a two-stage air supply channel; the two-stage enthalpy-increasing cylinder has a single-stage air supply channel one, a single-stage air supply channel two is set on the lower partition plate, and a single-stage enthalpy-increasing cylinder has a single-stage air supply channel three, together forming a single-stage air supply channel; the two-stage air supply channel, the single-stage air supply channel, and the enthalpy-increasing channel are interconnected; in addition, as Figure 4 As shown, the middle partition, the middle partition cavity, and the upper partition form a medium-pressure cavity.

[0037] The improvement of this utility model is as follows: 1. The three-cylinder compressor includes a two-stage enthalpy-increasing section and a single-stage enthalpy-increasing section, which operate in parallel. The two-stage enthalpy-increasing section includes a first-stage two-stage enthalpy-increasing cylinder and a second-stage two-stage enthalpy-increasing cylinder, and the single-stage enthalpy-increasing section includes a single-stage enthalpy-increasing cylinder. Both the two-stage and single-stage enthalpy-increasing sections are preferably supplied with gas through a one-way valve structure. 2. The first-stage cylinder for dual-stage enthalpy enhancement is equipped with a dual-stage gas injection channel one, and a dual-stage gas injection channel two is equipped on the middle partition plate, together forming a dual-stage gas injection channel; the first-stage cylinder for dual-stage enthalpy enhancement is equipped with a single-stage gas injection channel one, a single-stage gas injection channel two is equipped on the lower partition plate, and a single-stage gas injection channel three is equipped on the single-stage enthalpy enhancement cylinder, together forming a single-stage gas injection channel; the dual-stage gas injection channel, the single-stage gas injection channel, and the enthalpy enhancement channel are interconnected; 3. The cylinder arrangement sequence of this three-cylinder compressor, from top to bottom, is as follows: two-stage enthalpy-increasing second-stage cylinder, two-stage enthalpy-increasing first-stage cylinder, and single-stage enthalpy-increasing cylinder.

[0038] In some implementations... The single-stage cylinder 3 is also equipped with a check valve 26 and a back pressure channel 27. The single-stage air supply channel 3 28 is located on the axial side end face of the single-stage cylinder 3 facing the lower partition 16. The check valve 26 is located at the intersection of the single-stage air supply channel 3 28 and the back pressure channel 27. One end of the back pressure channel 27 can communicate with the exhaust port of the single-stage cylinder 3, and the other end can communicate with one side of the check valve 26. The other side of the check valve 26 is opposite to the single-stage air supply channel 25. When the pressure in the single-stage air supply channel 25 is greater than the pressure in the back pressure channel 27, the check valve 26 opens the single-stage air supply channel 3 28 to supply air to the inside of the single-stage cylinder 3.

[0039] Figure 2The diagram shows the air supply position of the first-stage cylinder. In this embodiment, the check valve preferably adopts a pin valve structure. One side of the cylinder is provided with an exhaust port crescent groove, and the other side is provided with a pin valve seat. One side of the pin valve is connected to the single-stage air supply channel two opened by the partition, and the other side is connected to the exhaust port crescent groove through the back pressure channel. During the compression process of the single-stage cylinder, as the pressure in the compression chamber rises from low pressure to medium pressure, the pressure on the pin valve side connected to the exhaust port crescent groove gradually changes. When the air supply pressure of the single-stage cylinder is greater than the pressure in the compression chamber, under the action of the pressure difference, the pin valve moves axially to open the single-stage air supply channel three to supply air to the single-stage cylinder.

[0040] In some implementations... It also includes an air-suction separator 9, one end of the first air-suction pipe 4 is connected to the interior of the air-suction separator 9 and the other end is connected to the air-suction port of the first-stage cylinder 1, one end of the second air-suction pipe 5 is also connected to the interior of the air-suction separator 9 and the other end is connected to the air-suction port of the single-stage cylinder 3.

[0041] This invention also enables the supply of refrigerant to the primary cylinder and the single-stage cylinder through the aforementioned intake separator, allowing the refrigerant to enter the primary cylinder and the single-stage cylinder for compression.

[0042] Figure 1 This is a structural diagram of the compressor of this utility model, as shown below. Figure 1 As shown, the compressor includes a housing, a motor, a pump body, a distributor assembly, and an enthalpy-increasing assembly. The distributor assembly includes one inlet pipe and two outlet pipes. The two outlet pipes pass through the housing and connect to the pump body's suction channel inside the housing. Low-pressure refrigerant enters the distributor and then enters the pump body through these channels. The enthalpy-increasing assembly includes one inlet pipe and one outlet pipe. The outlet pipe passes through the housing and connects to the pump body's enthalpy-increasing channel inside the housing. Medium-pressure refrigerant enters the enthalpy-increasing assembly and then enters the pump body through these channels. The motor is located inside the housing. After the power is connected, the motor rotates, driving the pump body to operate.

[0043] In some implementations... The exhaust port of the secondary cylinder 2 is connected to the interior of the housing 8, and the exhaust of the single-stage cylinder 3 is also connected to the interior of the housing 8; It also includes a lower flange 18, which has a receiving cavity 19, which is connected to the exhaust port of the single-stage cylinder 3 and is connected to the interior of the housing 8.

[0044] Figure 5 This is a schematic diagram of the refrigerant flow direction in the two-stage enthalpy-increasing section of this utility model, as shown below. Figure 5As shown, the medium-pressure refrigerant from the enthalpy-enhancing component enters the medium-pressure chamber of the two-stage enthalpy-enhancing section through the enthalpy-enhancing channel and the two-stage injection channel, forming the back pressure of the first-stage cylinder of the two-stage enthalpy-enhancing section. After the first-stage cylinder of the two-stage enthalpy-enhancing section draws in the low-pressure refrigerant and completes compression, it discharges the medium-pressure refrigerant into the medium-pressure chamber and mixes with the medium-pressure refrigerant from the enthalpy-enhancing component. Subsequently, the second-stage cylinder of the two-stage enthalpy-enhancing section draws in the mixed medium-pressure refrigerant, compresses it, and discharges the high-pressure refrigerant into the housing.

[0045] Figure 6 This is a schematic diagram of the refrigerant flow direction in a single-stage enthalpy-increasing section, as shown below. Figure 6 As shown, during the compression process of low-pressure refrigerant in the single-stage enthalpy-increasing cylinder, medium-pressure refrigerant flows into the single-stage compression cylinder through the enthalpy-increasing channel and the single-stage air supply channel from the enthalpy-increasing component. After the mixed refrigerant is compressed, high-pressure refrigerant is formed and discharged downwards, and then discharged into the housing through the flow holes of each component.

[0046] The present invention can form a receiving cavity by setting the lower flange, so that the exhaust gas of the single-stage cylinder enters the receiving cavity, is stabilized and then enters the housing.

[0047] Figure 2 This is a structural diagram of the compressor pump body of this utility model, as shown below. Figure 2 As shown, the compressor pump body includes a two-stage enthalpy-increasing section and a single-stage enthalpy-increasing section. The two-stage enthalpy-increasing section consists of a first-stage two-stage enthalpy-increasing cylinder, a second-stage two-stage enthalpy-increasing cylinder, an upper flange, an upper partition, a middle partition, a lower partition, a first check valve, and a crankshaft. The single-stage enthalpy-increasing section consists of a single-stage enthalpy-increasing cylinder, a second check valve (non-return valve), a lower partition, a lower flange, a muffler, and a crankshaft. The cylinder arrangement sequence from top to bottom is: second-stage two-stage enthalpy-increasing cylinder, first-stage two-stage enthalpy-increasing cylinder, and single-stage enthalpy-increasing cylinder.

[0048] In some implementations... It also includes a gas-liquid separator 10, which is located outside the housing 8, and one end of the gas-supply pipe 6 that extends out of the housing 8 is connected to the gas-liquid separator 10.

[0049] Furthermore, this invention, through the aforementioned gas-injection separator, can provide injection gas to the second-stage cylinder and the single-stage cylinder of the two-stage compression unit via the injection pipe. Under normal operating conditions, the synchronous operation of the single-stage cylinder increases the intake volume and expands the displacement demand; under low-temperature operating conditions, the single-stage cylinder simultaneously performs intake and injection, improving the capacity output under low-temperature conditions.

[0050] This utility model also provides a refrigeration cycle system, which includes the aforementioned three-cylinder gas-injection enthalpy-increasing compressor, and further includes an evaporator 20, a condenser 21, a flash evaporator 22, a first-stage throttling device 23 and a second-stage throttling device 24. The exhaust port of the compressor is connected to the condenser 21 through an exhaust pipe 101, and the flash evaporator 22 is connected to the gas-injection separator 10 through a gas-injection pipe 102.

[0051] This invention, through the piping connection method of the flash evaporator, first-stage and second-stage throttling devices, and evaporator-first-stage condenser in the aforementioned refrigeration cycle system, can utilize the gas injection pipe to separately or simultaneously inject gas into the second-stage cylinder and single-stage cylinder of the compressor, achieving a structure where both single and double stages can simultaneously inject and draw gas. Both single and double-stage cylinders have gas injection and intake functions. Under normal operating conditions, the synchronous operation of the single-stage cylinder increases the intake volume and expands the displacement requirement; under low-temperature operating conditions, the single-stage cylinder simultaneously has both intake and gas injection functions, improving the capacity output under low-temperature conditions.

[0052] Figure 1 The image shown is an external view of the compressor of this utility model. The compressor is equipped with a liquid distributor and a gas supply component (gas supply liquid distributor) on its exterior. Figure 7 The diagram shows the system of the heat exchange system of this invention. Low-pressure refrigerant in the evaporator is drawn in through the compressor distributor, compressed internally, and then discharged as high-pressure refrigerant before entering the condenser. The high-pressure refrigerant undergoes a first-stage throttling process before entering the flash evaporator. Gas-phase medium-pressure refrigerant in the flash evaporator is replenished with gas, and liquid-phase medium-pressure refrigerant undergoes a second-stage throttling process before entering the evaporator, completing the cycle. The gas-phase medium-pressure refrigerant from the flash evaporator enters the gas replenishment component through replenishment channels with varying flow resistances. The positions of the capillary tubes or other throttling components shown in the diagram can be selected based on the actual application.

[0053] Figure 7 This is a schematic diagram of the operating principle of the compressor air conditioning system of the present invention, as shown below. Figure 7 As shown, the low-temperature, low-pressure refrigerant from the evaporator simultaneously enters the two-stage enthalpy-increasing section and the single-stage enthalpy-increasing section of the compressor. After partial compression in the two-stage and single-stage enthalpy-increasing sections, the refrigerant mixes with the medium-pressure refrigerant from the flash evaporator. The mixed medium-pressure refrigerant continues to be compressed in the two-stage and single-stage enthalpy-increasing sections to form a high-temperature, high-pressure refrigerant that is discharged from the compressor. Subsequently, this high-temperature, high-pressure refrigerant enters the condenser for heat exchange. After heat exchange, the liquid refrigerant is throttled and depressurized by the first-stage throttling device and enters the flash evaporator. The saturated gaseous refrigerant in the flash evaporator enters the compressor to work, and the saturated liquid refrigerant enters the second-stage throttling device for a second throttling and depressurization. After heat exchange is completed in the evaporator to form a low-temperature, low-pressure refrigerant, it enters the compressor to work, completing the air conditioning system cycle.

[0054] This utility model also provides an air conditioner, which includes the aforementioned refrigeration cycle system.

[0055] The three-cylinder enthalpy-increasing compressor of this invention can expand its displacement by designing two low-pressure cylinders. However, the displacement design of the high-pressure cylinder is limited by factors such as volumetric efficiency and structural strength, which restricts the upper limit of the volume ratio design. The volume ratio of two-stage compression is a key factor affecting performance, and a limited upper limit will affect the energy efficiency under low-pressure ratio conditions (normal operating conditions).

[0056] This invention proposes a rotor-type two-stage enthalpy-enhancing compressor. The pump body consists of a two-stage compression unit and a single-stage compression unit. A single channel is used to replenish gas to the intermediate cavity of the two-stage compression unit and the compression cavity of the single-stage compression unit, respectively. This design ensures the optimal volume ratio of the two-stage compressor unit, guaranteeing energy efficiency under low pressure ratio conditions (normal operating conditions). Simultaneously, it makes the replenishment pressure and volume of gas supplied to the single-stage and two-stage cylinders more uniform, thereby effectively improving the enthalpy-enhancing effect of gas replenishment to multiple cylinders and further enhancing the compressor's cooling and heating capabilities.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A three-cylinder inlet gas enthalpy-increasing compressor, characterized in that: include: A two-stage compression unit and a single-stage compression unit, wherein the two-stage compression unit includes a first-stage cylinder (1) and a second-stage cylinder (2), the first-stage cylinder (1) and the second-stage cylinder (2) are connected in series to form a two-stage compression unit, and the single-stage compression unit includes a single-stage cylinder (3). The three-cylinder gas-injection enthalpy-increasing compressor also includes a first suction pipe (4), a second suction pipe (5), and a gas-injection pipe (6). The first suction pipe (4) is connected to the suction port of the first-stage cylinder (1) to draw in low-pressure refrigerant from outside the compressor. The second suction pipe (5) is connected to the suction port of the single-stage cylinder (3) to draw in low-pressure refrigerant from outside the compressor. The air supply pipe (6) can be connected to the secondary cylinder (2) and the single-stage cylinder (3) respectively, so as to supply air to the secondary cylinder (2) and the single-stage cylinder (3).

2. The three-cylinder inlet gas enthalpy-increasing compressor according to claim 1, characterized in that: It also includes a housing (8), in which the dual-stage compression unit and the single-stage compression unit are both disposed. A middle partition (12) and an upper partition (13) are disposed between the first-stage cylinder (1) and the second-stage cylinder (2). A medium-pressure mixing chamber (14) is provided between the middle partition (12) and the upper partition (13). The exhaust port of the first-stage cylinder (1) is connected to the medium-pressure mixing chamber (14). The medium-pressure mixing chamber (14) is also connected to the intake port of the second-stage cylinder (2). An enthalpy-increasing channel (15) is also provided on the first-stage cylinder (1). One end of the air supply pipe (6) after passing through the housing (8) is connected to the enthalpy-increasing channel (15). The enthalpy-increasing channel (15) can be connected to the medium-pressure mixing chamber (14) and the interior of the single-stage cylinder (3), respectively.

3. The three-cylinder inlet gas enthalpy-increasing compressor according to claim 2, characterized in that: The first-stage cylinder (1) is also provided with a dual-stage air supply channel one (7), and the middle partition plate (12) is also provided with a dual-stage air supply channel two (11). One end of the dual-stage air supply channel one (7) extends into the interior of the first-stage cylinder (1) to communicate with the enthalpy-increasing channel (15). The other end of the dual-stage air supply channel one (7) extends to the axial end face connected to the middle partition plate (12). One end of the dual-stage air supply channel two (11) extends to communicate with the medium-pressure mixing chamber (14). The other end of the dual-stage air supply channel two (11) extends to the axial end face connected to the first-stage cylinder (1), so that the dual-stage air supply channel two (11) is opposite to and connected to the dual-stage air supply channel one (7). The enthalpy-increasing channel (15), the dual-stage air supply channel one (7), the dual-stage air supply channel two (11) and the medium-pressure mixing chamber (14) form a sequentially connected passage.

4. The three-cylinder inlet gas enthalpy-increasing compressor according to claim 2 or 3, characterized in that: A lower partition (16) is provided between the first-stage cylinder (1) and the single-stage cylinder (3). A single-stage air supply channel one (17) is also provided on the first-stage cylinder (1). A single-stage air supply channel two (25) is also provided on the lower partition (16). A single-stage air supply channel three (28) is also provided on the single-stage cylinder (3). One end of the single-stage air supply channel one (17) extends into the interior of the first-stage cylinder (1) to communicate with the enthalpy-increasing channel (15). The other end of the single-stage air supply channel one (17) extends to the axial end face connected to the lower partition (16). One end of channel two (25) extends to the axial end face connected to the first stage cylinder (1) to communicate with the first stage air supply channel (17). The other end of the first stage air supply channel (25) extends to the axial end face connected to the first stage cylinder (3) to communicate with the third stage air supply channel (28), so that the enthalpy-increasing channel (15), the first stage air supply channel (17), the second stage air supply channel (25) and the third stage air supply channel (28) form a sequentially connected passage. The third stage air supply channel (28) is connected to the compression chamber of the first stage cylinder (3).

5. The three-cylinder inlet gas enthalpy-increasing compressor according to claim 4, characterized in that: The single-stage cylinder (3) is also provided with a check valve (26) and a back pressure channel (27). The single-stage replenishment channel three (28) is provided on the axial side end face of the single-stage cylinder (3) facing the lower partition (16). The check valve (26) is provided at the position where the single-stage replenishment channel three (28) intersects with the back pressure channel (27). One end of the back pressure channel (27) can be connected to the exhaust port of the single-stage cylinder (3), and the other end is connected to one side of the check valve (26). The other side of the check valve (26) is opposite to the single-stage replenishment channel two (25). When the pressure in the single-stage replenishment channel two (25) is greater than the pressure in the back pressure channel (27), the check valve (26) opens the single-stage replenishment channel three (28) to replenish the single-stage cylinder (3).

6. The three-cylinder inlet gas enthalpy-increasing compressor according to claim 1, characterized in that: It also includes an air-suction separator (9), one end of the first air-suction pipe (4) is connected to the interior of the air-suction separator (9) and the other end is connected to the air-suction port of the first stage cylinder (1), one end of the second air-suction pipe (5) is also connected to the interior of the air-suction separator (9) and the other end is connected to the air-suction port of the single stage cylinder (3).

7. The three-cylinder inlet gas enthalpy-increasing compressor according to claim 2, characterized in that: The exhaust port of the secondary cylinder (2) is connected to the interior of the housing (8), and the exhaust of the single-stage cylinder (3) is also connected to the interior of the housing (8); It also includes a lower flange (18) having a receiving cavity (19) that is connected to the exhaust port of the single-stage cylinder (3) and is connected to the interior of the housing (8).

8. The three-cylinder inlet gas enthalpy-increasing compressor according to claim 2, characterized in that: It also includes a gas-liquid separator (10), which is located outside the housing (8), and the end of the gas-liquid pipe (6) that extends out of the housing (8) is connected to the gas-liquid separator (10).

9. A refrigeration cycle system characterized by: The compressor includes the three-cylinder gas-injection enthalpy-increasing compressor as described in claim 8, and further includes an evaporator (20), a condenser (21), a flash evaporator (22), a first-stage throttling device (23), and a second-stage throttling device (24). The exhaust port of the compressor is connected to the condenser (21) through an exhaust pipe (101), and the flash evaporator (22) is connected to the gas-injection separator (10) through a gas-injection pipe (102).

10. An air conditioner characterized by comprising: Includes the refrigeration cycle system as described in claim 9.

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