Graded enthalpy increasing compressor and control method thereof

Abstract

The invention discloses a graded enthalpy-increasing compressor and a control method thereof. The compressor comprises a shell, a first-stage air cylinder is arranged on the lower portion in the shell, and an air inlet pipe is arranged on the first-stage air cylinder; a second-stage air cylinder is arranged above the first-stage air cylinder, and the first-stage air cylinder and the second-stage air cylinder are separated by a middle plate and connected through The gas flow path comprises a lower exhaust cavity, and the lower exhaust cavity is located below the first-stage air cylinder; a communicated upper exhaust cavity is arranged above the secondary cylinder; the compressor further comprises a first enthalpy increasing channel and a second enthalpy increasing channel, the first enthalpy increasing channel communicates with the first-stage air cylinder, and the second enthalpy increasing channel communicates with the gas flow path, is provided with a control valve for controlling on-off and is connected with the temperature sensor. According to the graded enthalpy-increasing compressor and the control method thereof, the first enthalpy-increasing channel always supplements air into the shell, and when the difference between the environment temperature and the set temperature is too large, the second enthalpy-increasing channel is opened to further supplement air into the shell, so that the allowable maximum air supplementing amount of the compressor is increased, and the temperature adjusting effect of the compressor is improved; and the equipment reliability and flexibility are improved.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and particularly to a staged enthalpy-increasing compressor and a control method thereof. Background Art

[0002] In order to adapt to application environments with large temperature differences, compressors often have an enthalpy-increasing function to improve performance and expand the application range. Existing compressors with an enthalpy-increasing function can be divided into two categories: single-stage compression with enthalpy increase and two-stage compression with enthalpy increase.

[0003] For a single-stage enthalpy-increasing compressor, the enthalpy increase is limited by the volume of the cylinder and the piston operating cycle. When the temperature difference between the user-set temperature and the ambient temperature is large, there may be a situation of insufficient enthalpy increase.

[0004] For a two-stage enthalpy-increasing compressor, since the volume of the first-stage cylinder and the volume of the second-stage cylinder are fixed, the volume ratio of the two-stage compression is also certain, generally designed according to the set target working conditions. The volume of the second stage is the sum of the gas compressed by the first stage and the gas required for enthalpy increase under this working condition. When the temperature difference between the user-set temperature and the ambient temperature is large, the required enthalpy increase is correspondingly large, and the volume of the second-stage cylinder needs to be designed to be large. However, when applied to an environment with a small temperature difference, the compression volume of the first-stage cylinder can meet the design requirements, and the second-stage cylinder may idle due to too large a volume design, and there may also be situations such as spring jumping caused by insufficient pressure difference, thus affecting the reliability of the equipment.

[0005] In view of the above defects, the present invention proposes a staged enthalpy-increasing compressor and a control method thereof. Summary of the Invention

[0006] The purpose of the present invention is to provide a staged enthalpy-increasing compressor and a control method thereof, so that the enthalpy increase of the compressor can be adjusted according to the use environment, expand the application range of the compressor, and improve the reliability of the equipment.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] The present invention provides a staged enthalpy-increasing compressor. The compressor includes a housing. A first-stage cylinder is provided at the lower part inside the housing, and an intake pipe communicating with the external environment is provided on the first-stage cylinder. A second-stage cylinder is provided above the first-stage cylinder. The first-stage cylinder and the second-stage cylinder are separated by an intermediate plate and connected through a gas flow path. The gas flow path includes a lower exhaust cavity provided below the first-stage cylinder. An upper exhaust cavity communicating with each other is provided above the second-stage cylinder.

[0009] The compressor further includes a first enthalpy-increasing channel and a second enthalpy-increasing channel. The first enthalpy-increasing channel is communicated with the first-stage cylinder, and the second enthalpy-increasing channel is communicated with the gas flow path. A control valve for controlling the on-off of the second enthalpy-increasing channel is provided on the second enthalpy-increasing channel. The control valve is connected to a temperature sensor, and the temperature sensor is used to measure the ambient temperature to control the opening and closing of the control valve.

[0010] In this technical solution, the first enthalpy-increasing channel is always open to supplement air into the housing. When the difference between the ambient temperature and the set temperature is too large, the second enthalpy-increasing channel is opened to further supplement air into the housing to reach the set temperature. At the same time, since the first enthalpy-increasing channel and the second enthalpy-increasing channel are connected to different positions in the housing, the maximum allowable air supplement amount of the compressor can be increased, the effect of the compressor in adjusting the temperature can be improved, and the reliability and flexibility of the equipment can be improved.

[0011] Preferably, the second enthalpy-increasing channel is communicated with the lower exhaust cavity.

[0012] In this technical solution, the first-stage cylinder is only communicated with the second-stage cylinder via the lower exhaust cavity. At this time, the second enthalpy-increasing channel is communicated with the lower exhaust cavity for controllable secondary enthalpy increase.

[0013] Preferably, the gas flow path further includes an intermediate exhaust cavity, which is arranged between the first-stage cylinder and the second-stage cylinder and is communicated with the first-stage cylinder, the lower exhaust cavity and the second-stage cylinder.

[0014] In this technical solution, the first-stage cylinder is respectively communicated with the intermediate exhaust cavity and the lower exhaust cavity. Part of the gas flowing out of the first-stage cylinder directly flows into the intermediate exhaust cavity, and part first flows into the lower exhaust cavity and then into the intermediate exhaust cavity, and then flows into the second-stage cylinder from the intermediate exhaust cavity.

[0015] Preferably, the second enthalpy-increasing channel is only communicated with the intermediate exhaust cavity or the lower exhaust cavity.

[0016] Preferably, the second enthalpy-increasing channel is simultaneously communicated with the intermediate exhaust cavity and the lower exhaust cavity.

[0017] In this technical solution, the second enthalpy-increasing channel can perform enthalpy increase in both the intermediate exhaust cavity and the lower exhaust cavity, improving the enthalpy increase amount of the equipment.

[0018] Preferably, the second enthalpy-increasing channel is divided into an upper second channel communicated with the intermediate exhaust cavity and a lower second channel communicated with the lower exhaust cavity. The control valve includes a first control valve and a second control valve. The first control valve is arranged on the upper second channel, and the second control valve is arranged on the lower second channel.

[0019] In this technical solution, the first control valve and the second control valve are separated from each other.

[0020] Preferably, the second enthalpy-increasing channel is divided into two branches which are respectively communicated with the middle exhaust cavity and the lower exhaust cavity, and both of the two branches of the second enthalpy-increasing channel are controlled by the same control valve.

[0021] In this technical solution, using one control valve reduces the control program and improves the control reliability.

[0022] Preferably, a piston is arranged in the secondary cylinder, and a secondary cylinder compression cavity is formed by enclosing the inner side wall of the secondary cylinder and the piston. The sum of the volumes of the middle exhaust cavity and the lower exhaust cavity is 2 to 15 times the volume of the secondary cylinder compression cavity.

[0023] In this technical solution, the ratio of the sum of the volumes of the middle exhaust cavity and the lower exhaust cavity to the volume of the secondary cylinder is moderate, which can reduce the air supplement resistance and the suction resistance of the secondary cylinder, thereby improving the compressor efficiency.

[0024] Preferably, the intake pipe extends upward along the housing on the outside of the housing.

[0025] The present invention also provides a control method for a staged enthalpy-increasing compressor, which is applied to the compressor as described in any one of the above;

[0026] When the ambient temperature is higher than -12°C and the compressor is in the heating mode, or when the ambient temperature is lower than 35°C and the compressor is in the cooling mode, the control valve is closed;

[0027] When the ambient temperature is lower than -12°C and the compressor is in the heating mode, or when the ambient temperature is higher than 35°C and the compressor is in the cooling mode, the control valve is opened.

[0028] In this technical solution, when the compressor operates at a normal ambient temperature, only the first enthalpy-increasing channel is required for enthalpy-increasing air supplement; while when the ambient temperature deviates too much from the set temperature, the second enthalpy-increasing channel is opened to additionally supplement air, thereby realizing flexible control of the equipment.

[0029] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present invention.

[0030] The positive and progressive effects of the present invention are as follows:

[0031] The staged enthalpy-increasing compressor and its control method of the present invention are such that the first enthalpy-increasing channel is always open to supplement gas into the housing. When the difference between the ambient temperature and the set temperature is too large, the second enthalpy-increasing channel is opened to further supplement gas into the housing to reach the set temperature. At the same time, since the first enthalpy-increasing channel and the second enthalpy-increasing channel are connected to different positions in the housing, the maximum allowable gas supplement amount of the compressor can be increased; by combining the controllable secondary enthalpy increase of the second enthalpy-increasing channel and the always-on enthalpy increase of the first enthalpy-increasing channel, technical problems such as insufficient enthalpy increase and idling of the second-stage cylinder caused by only first-stage enthalpy increase or only second-stage enthalpy increase are avoided, the effect of the compressor in regulating temperature is improved, and the reliability and flexibility of the equipment are enhanced.

[0032] To further understand the features and technical content of the present application, please refer to the following detailed description and drawings of the present application. However, the detailed description and the drawings here are only used to illustrate the present application and do not impose any limitation on the scope of the claims of the present application. Brief Description of the Drawings

[0033] By referring to the drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more obvious.

[0034] Figure 1 It is a schematic cross-sectional view of the main body of the staged enthalpy-increasing compressor according to Embodiment 1 of the present invention.

[0035] Figure 2 It is a schematic cross-sectional view of the main body of the staged enthalpy-increasing compressor according to Embodiment 2 of the present invention.

[0036] Figure 3 It is a schematic cross-sectional view of the main body of the staged enthalpy-increasing compressor according to Embodiment 3 of the present invention.

[0037] Figure 4 It is a schematic cross-sectional view of the main body of the staged enthalpy-increasing compressor according to Embodiment 4 of the present invention.

[0038] Figure 5 It is a schematic cross-sectional view of the main body of the staged enthalpy-increasing compressor according to Embodiment 5 of the present invention.

[0039] Reference Signs

[0040] 1 Housing

[0041] 2 First-stage Cylinder

[0042] 3 Second-stage Cylinder

[0043] 31 Second-stage Cylinder Compression Chamber

[0044] 4 Lower Exhaust Chamber

[0045] 5 Intermediate Exhaust Chamber

[0046] 6 Upper Exhaust Chamber

[0047] 7 Inlet pipe

[0048] 8 Intermediate plate

[0049] 9 Control valve

[0050] 91 First control valve

[0051] 92 Second control valve

[0052] 10 First enthalpy-increasing channel

[0053] 20 Second enthalpy-increasing channel

[0054] 201 Upper second channel

[0055] 202 Lower second channel Detailed implementation manners

[0056] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation manners. Various details in the present application can also be modified or changed according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0057] The following takes the drawings as a reference and details the embodiments of the present application so that those skilled in the technical field to which the present application belongs can easily implement it. The present application can be embodied in many different forms and is not limited to the embodiments described herein.

[0058] In the description of the present application, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics represented can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples.

[0059] In addition, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the representation of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0060] To clearly illustrate this application, devices irrelevant to the description are omitted, and the same or similar constituent elements throughout the specification are given the same reference numerals.

[0061] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" with other elements interposed therebetween. In addition, when it is said that a certain device "includes" a certain constituent element, unless there is a particularly contrary record, it does not exclude other constituent elements but means that other constituent elements may also be included.

[0062] When it is said that a device is "above" another device, this may be directly above the other device, but there may also be other devices therebetween. When it is said that a device is "directly" "above" another device, there are no other devices therebetween.

[0063] Although in some instances the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The term "or" and "and / or" used herein are construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B and C". An exception to this definition occurs only when the combination of elements, functions, steps or operations is mutually exclusive in some way.

[0064] The technical terms used herein are only for referring to specific embodiments and are not intended to limit this application. The singular forms used herein also include the plural forms as long as the context does not clearly indicate the contrary meaning. The meaning of "including" used in the specification is to specify specific features, regions, integers, steps, operations, elements, and / or components, and does not exclude the existence or addition of other features, regions, integers, steps, operations, elements, and / or components.

[0065] Although not defined differently, including the technical terms and scientific terms used herein, all terms have the same meaning as generally understood by those skilled in the technical field to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted to have a meaning consistent with the relevant technical literature and the content presented herein. As long as they are not defined, they shall not be over-interpreted as ideal or overly formulaic meanings.

[0066] Embodiment 1

[0067] As Figure 1 shown, in this embodiment, the staged enthalpy-increasing compressor includes a housing 1. A first-stage cylinder 2 is provided at the lower part inside the housing 1. An intake pipe 7 communicating with the external environment is provided on the first-stage cylinder 2. A second-stage cylinder 3 is provided above the first-stage cylinder 2. The first-stage cylinder 2 and the second-stage cylinder 3 are separated by an intermediate plate 8 and connected through a gas flow path. The gas flow path includes a lower exhaust cavity 4 provided below the first-stage cylinder 2. An upper exhaust cavity 6 communicating therewith is provided above the second-stage cylinder 3. The intake pipe 7 extends upward along the housing 1 on the outside of the housing 1.

[0068] The compressor further includes a first enthalpy-increasing channel 10 and a second enthalpy-increasing channel 20. The first enthalpy-increasing channel 10 communicates with the first-stage cylinder 2. The second enthalpy-increasing channel 20 communicates with the gas flow path. A control valve 9 for controlling its on-off is provided on the second enthalpy-increasing channel 20. The control valve 9 is connected to a temperature sensor, and the temperature sensor is used to measure the ambient temperature to control the opening and closing of the control valve 9.

[0069] The first enthalpy-increasing channel 10 is always open to supply air into the housing 1 to increase the mass flow rate on the condensing side and thereby increase the total exhaust volume of the compressor. When the difference between the ambient temperature and the user-set temperature is too large, only single-stage enthalpy increase will be limited by the volume of the cylinder and the piston operation cycle. At this time, the second enthalpy-increasing channel 20 is opened to further supply air into the housing 1, so that the enthalpy increase amount is not limited by the above, to avoid insufficient enthalpy increase amount under extreme ambient temperatures, and further improve the temperature adjustment ability of the compressor, thereby reaching the user-set temperature.

[0070] The second enthalpy-increasing channel 20 communicates with the lower exhaust cavity 4. The first-stage cylinder 2 is only connected to the second-stage cylinder 3 via the lower exhaust cavity 4. At this time, the second enthalpy-increasing channel 20 communicates with the lower exhaust cavity 4 for controllable secondary enthalpy increase.

[0071] In addition, since the first enthalpy-increasing channel 10 and the second enthalpy-increasing channel 20 are arranged at different positions within the housing 1, the maximum allowable gas replenishment volume of the compressor can be increased, avoiding the situation where the compression ratio of the compressor is too small and the performance loss is large when the temperature difference between the ambient temperature and the user-set temperature is too small. By combining the controllable secondary enthalpy increase of the second enthalpy-increasing channel 20 with the continuous enthalpy increase of the first enthalpy-increasing channel 10, technical problems such as insufficient enthalpy increase and idling of the second-stage cylinder caused by only one-stage enthalpy increase or only two-stage enthalpy increase are avoided, the effect of the compressor in regulating temperature is improved, and at the same time, the reliability and flexibility of the equipment are enhanced.

[0072] This embodiment also provides a control method for a staged enthalpy-increasing compressor, which is applied to the compressor described in any one of the above; when the ambient temperature is higher than -12°C and the compressor is operating in heating mode, or when the ambient temperature is lower than 35°C and the compressor is operating in cooling mode, the control valve 9 is closed; when the ambient temperature is lower than -12°C and the compressor is operating in heating mode, or when the ambient temperature is higher than 35°C and the compressor is operating in cooling mode, the control valve 9 is opened. When the compressor is operating at normal ambient temperature, only the first enthalpy-increasing channel 10 needs to perform enthalpy increase and gas replenishment; while when the temperature difference between the ambient temperature and the set temperature is too large, the second enthalpy-increasing channel 20 is opened to additionally replenish gas, thereby achieving flexible control of the equipment. In other embodiments, according to different size designs and requirements of the compressor, the set range can also be placed in other intervals.

[0073] Embodiment 2

[0074] As Figure 2 shown, the difference between this embodiment and Embodiment 1 is that:

[0075] The gas flow path further includes an intermediate exhaust cavity 5, which is arranged between the first-stage cylinder 2 and the second-stage cylinder 3, and the intermediate exhaust cavity 5 is communicated with the first-stage cylinder 2, the lower exhaust cavity 4 and the second-stage cylinder 3. The first-stage cylinder 2 is respectively communicated with the intermediate exhaust cavity 5 and the lower exhaust cavity 4. Part of the gas flowing out of the first-stage cylinder 2 directly flows into the intermediate exhaust cavity 5, and part first flows into the lower exhaust cavity 4 and then into the intermediate exhaust cavity 5, and then flows into the second-stage cylinder 3 from the intermediate exhaust cavity 5. The second enthalpy-increasing channel 20 is only communicated with the intermediate exhaust cavity 5.

[0076] A piston is provided in the second-stage cylinder 3. The inner side wall of the second-stage cylinder 3 and the piston enclose a second-stage cylinder compression cavity 31. The sum of the volumes of the intermediate exhaust cavity 5 and the lower exhaust cavity 4 is 8 times the volume of the second-stage cylinder compression cavity 31. The ratio of the sum of the volumes of the intermediate exhaust cavity 5 and the lower exhaust cavity 4 to the volume of the second-stage cylinder 3 is appropriate, which can reduce the gas replenishment resistance and the suction resistance of the second-stage cylinder 3, thereby improving the efficiency of the compressor.

[0077] In other embodiments, the sum of the volumes of the intermediate exhaust chamber 5 and the lower exhaust chamber 4 can also be any value between 2 and 15 times the volume of the secondary cylinder compression chamber 31, such as 3 times, 6 times, 10 times, 12 times, etc.

[0078] Embodiment 3

[0079] As Figure 3 shown, the difference between this embodiment and Embodiment 2 is that:

[0080] The second enthalpy-increasing channel 20 is only connected to the lower exhaust chamber 4.

[0081] Embodiment 4

[0082] As Figure 4 shown, the difference between this embodiment and Embodiment 2 is that:

[0083] The second enthalpy-increasing channel 20 is simultaneously connected to both the intermediate exhaust chamber 5 and the lower exhaust chamber 4. The second enthalpy-increasing channel 20 can perform enthalpy increase in both the intermediate exhaust chamber 5 and the lower exhaust chamber 4, improving the enthalpy increase amount of the device.

[0084] The second enthalpy-increasing channel 20 is divided into an upper second channel 201 connected to the intermediate exhaust chamber 5 and a lower second channel 202 connected to the lower exhaust chamber 4. The control valve 9 includes a first control valve 91 and a second control valve 92. The first control valve 91 is arranged on the upper second channel 201, and the second control valve 92 is arranged on the lower second channel 202. The first control valve 91 and the second control valve 92 are separated from each other.

[0085] Embodiment 5

[0086] As Figure 5 shown, the difference between this embodiment and Embodiment 4 is that:

[0087] The second enthalpy-increasing channel 20 is divided into two branches and is respectively connected to the intermediate exhaust chamber 5 and the lower exhaust chamber 4, and both branches of the second enthalpy-increasing channel 20 are controlled by the same control valve 9. Using one control valve 9 reduces the control program and improves the control reliability.

[0088] In summary, the purpose of the present invention is to provide a staged enthalpy-increasing compressor and its control method, enabling the enthalpy increase of the compressor to be adjusted according to the usage environment, expanding the application range of the compressor, and improving the reliability of the device.

[0089] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A staged enthalpy-increasing compressor, characterized in that, The compressor includes a housing (1). A first-stage cylinder (2) is provided at the lower part inside the housing (1), and an intake pipe (7) communicating with the external environment is provided on the first-stage cylinder (2); a second-stage cylinder (3) is provided above the first-stage cylinder (2), and the first-stage cylinder (2) and the second-stage cylinder (3) are separated by an intermediate plate (8) and connected through a gas flow path; the gas flow path includes a lower exhaust cavity (4), and the lower exhaust cavity (4) is provided below the first-stage cylinder (2); an upper exhaust cavity (6) is provided above the second-stage cylinder (3) and is in communication. The compressor further includes a first enthalpy-increasing channel (10) and a second enthalpy-increasing channel (20). The first enthalpy-increasing channel (10) communicates with the first-stage cylinder (2), the second enthalpy-increasing channel (20) communicates with the gas flow path, a control valve (9) for controlling its on-off is provided on the second enthalpy-increasing channel (20), the control valve (9) is connected to a temperature sensor, and the temperature sensor is used to measure the ambient temperature to control the opening and closing of the control valve (9).

2. The compressor according to claim 1, wherein The second enthalpy-increasing channel (20) communicates with the lower exhaust cavity (4).

3. The compressor according to claim 1, characterized in that, The gas flow path further includes an intermediate exhaust cavity (5), the intermediate exhaust cavity (5) is provided between the first-stage cylinder (2) and the second-stage cylinder (3), and the intermediate exhaust cavity (5) communicates with the first-stage cylinder (2), the lower exhaust cavity (4) and the second-stage cylinder (3).

4. The compressor according to claim 3, characterized in that, The second enthalpy-increasing channel (20) only communicates with the intermediate exhaust cavity (5) or the lower exhaust cavity (4).

5. The compressor according to claim 3, wherein The second enthalpy-increasing channel (20) communicates with both the intermediate exhaust cavity (5) and the lower exhaust cavity (4) at the same time.

6. The compressor according to claim 5, wherein, The second enthalpy-increasing channel (20) is divided into an upper second channel (201) communicating with the intermediate exhaust cavity (5) and a lower second channel (202) communicating with the lower exhaust cavity (4). The control valve (9) includes a first control valve (91) and a second control valve (92). The first control valve (91) is provided on the upper second channel (201), and the second control valve (92) is provided on the lower second channel (202).

7. The compressor according to claim 5, wherein, The second enthalpy-increasing channel (20) is divided into two branches that respectively communicate with the intermediate exhaust cavity (5) and the lower exhaust cavity (4), and both branches of the second enthalpy-increasing channel (20) are controlled by the same control valve (9).

8. The compressor according to claim 3, characterized in that A piston is provided inside the second-stage cylinder (3), and a second-stage cylinder compression cavity (31) is formed by enclosing the inner side wall of the second-stage cylinder (3) and the piston. The sum of the volumes of the intermediate exhaust cavity (5) and the lower exhaust cavity (4) is 2 to 15 times the volume of the second-stage cylinder compression cavity (31).

9. The compressor according to claim 1, characterized in that, The intake pipe (7) extends upward along the housing (1) on the outside of the housing (1).

10. A control method for a staged enthalpy-increasing compressor, characterized in that, Applied to the compressor according to any one of claims 1-9; When the ambient temperature is higher than -12°C and the compressor is in the heating mode, or when the ambient temperature is lower than 35°C and the compressor is in the cooling mode, the control valve (9) is closed; When the ambient temperature is lower than -12°C and the compressor is in the heating mode, or when the ambient temperature is higher than 35°C and the compressor is in the cooling mode, the control valve (9) opens.

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