TWM635271U - Reciprocating compressor - Google Patents

Abstract

A reciprocating compressor includes a cylinder block assembly, a reciprocating assembly and an external pipeline. The cylinder block assembly is formed by connecting a high-pressure cylinder portion and a low-pressure cylinder portion. The high-pressure cylinder portion is formed with a high-pressure inner cavity. The low-pressure cylinder portion is formed with a low-pressure inner cavity connected to the high-pressure inner cavity. Two ends of the external pipeline are respectively connected to the cylinder block assembly. The reciprocating assembly includes a high pressure piston portion, a low pressure piston portion and a piston rod. The high pressure piston portion is located in the high-pressure inner cavity. The low pressure piston portion is located in the low-pressure inner cavity, and a balance chamber is defined between the high pressure piston portion and the low pressure piston portion. The piston rod is coaxially fixed on the high pressure piston portion and the low pressure piston portion, and one part of the piston rod extends outwards from the cylinder block assembly from one end of the low-pressure cylinder portion.

Description

Reciprocating compressor

The invention relates to a compressor, especially a reciprocating compressor.

Generally speaking, a reciprocating compressor is a compressor in which the crankshaft drives the piston to move up and down. When the piston is displaced, the volume in the cylinder will change to complete the compression process. More specifically, a reciprocating compressor is provided with a balance chamber between the high-pressure section and the low-pressure section at both ends of the cylinder block to reduce the pressure difference between the high-pressure section and the low-pressure section.

However, during the compression process of the compressor, the pressure difference in the balance chamber will be too large, resulting in gas leakage from the low-pressure section and the high-pressure section to the balance chamber, thereby affecting the compression efficiency.

In this way, how to develop a solution to improve the above-mentioned direction of efforts is really an important issue that the relevant industry should not delay at present.

This creation proposes a reciprocating compressor to solve the problems of the prior art.

According to an embodiment of the present invention, a reciprocating compressor includes a cylinder block assembly, a reciprocating assembly, and an external pipeline. The cylinder block assembly is formed by connecting a high-pressure cylinder part and a low-pressure cylinder part. The high-pressure stage cylinder part has a first air inlet, a first exhaust port and a high-pressure stage inner cavity communicating with the first air inlet and the first exhaust port. The low-pressure stage cylinder part has a second air inlet, a second exhaust port connected to the second air inlet, and a low-pressure stage inner chamber connected to the high-pressure stage inner chamber, the second air inlet and the second exhaust port. Both ends of the external pipeline are respectively connected to the cylinder block assembly, and the external pipeline is respectively connected to the second exhaust port and the first air intake port. The reciprocating component is reciprocally located in the cylinder body component, and includes a high-pressure piston part, a low-pressure piston part and a piston rod. The high-pressure stage piston portion is located in the high-pressure stage inner cavity. The low-pressure stage piston part is located in the low-pressure stage inner chamber, and defines a balance chamber with the high-pressure stage piston part. The high-pressure piston part and the low-pressure piston part are coaxially fixed on the piston rod, and a part of the piston rod extends out of the cylinder block assembly from one end of the low-pressure cylinder.

According to one or more embodiments of the present invention, the above-mentioned reciprocating compressor further includes a through-chamber flow channel, which communicates with the cylinder block assembly and is arranged correspondingly, and communicates with the balance chamber.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, one end of the internal passage communicates with the balance cavity, and the other end communicates with the intake pipe and the inner chamber of the low-pressure stage through the second intake port.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the intake pipe is used to introduce a first-stage compressed gas or an external gas source into the cylinder block assembly.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the through-cavity flow channel is an external flow channel, one end of the external flow channel is connected to the cylinder block assembly, and the external flow channel is communicated and balanced through the low-pressure stage cylinder parts cavity.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the other end of the external flow channel communicates with the external pipeline.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the external flow channel is used to introduce an external air source into the cylinder block assembly.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the pressure of the external gas source is less than or equal to the gas pressure of the inner cavity of the low-pressure stage, and the gas pressure of the inner cavity of the low-pressure stage is lower than the gas pressure of the inner cavity of the high-pressure stage .

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the reciprocating compressor is a two-stage reciprocating compressor or a three-stage reciprocating compressor.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the low-pressure stage cylinder part is the first-stage compression cylinder, and the high-pressure stage cylinder part is the second-stage compression cylinder.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, the low-pressure stage cylinder part is the second-stage compression cylinder, and the high-pressure stage cylinder part is the third-stage compression cylinder.

According to one or more embodiments of the present invention, in the above-mentioned reciprocating compressor, a cooler for lowering the temperature is provided on the external pipeline.

In this way, through the above structure, the reciprocating compressor introduces a compressed gas or an external air source to reduce the pressure difference in the balance chamber, thereby reducing the gas flow in the low-pressure stage cylinder part and the high-pressure stage cylinder part to balance The leakage of the cavity is improved, and the leaked compressed gas is recovered through the flow channel of the cavity, thereby improving the compression efficiency of the reciprocating compressor.

The above description is only used to explain the problem to be solved by this creation, the technical means to solve the problem, and its effects, etc. The specific details of this creation will be introduced in detail in the following implementation methods and related drawings.

The following will disclose multiple implementations of this creation with diagrams. For the sake of clarity, many practical details will be described together in the following description. However, those skilled in the art should understand that in some implementations of the present invention, these practical details are not necessary, and thus should not be used to limit the present invention. In addition, for the sake of simplifying the drawings, some well-known structures and components will be shown in a simple and schematic manner in the drawings. In addition, for the convenience of readers, the size of each element in the drawings is not drawn according to actual scale.

FIG. 1 and FIG. 2 are schematic diagrams of continuous operation of the reciprocating compressor 10 according to the first embodiment of the present invention, respectively. As shown in FIGS. 1 to 2 , the reciprocating compressor 10 includes a cylinder block assembly 100 , a reciprocating assembly 200 and an external pipeline 300 .

The cylinder block assembly 100 is formed by connecting a high-pressure cylinder part 110 and a low-pressure cylinder part 120 . In this embodiment, the high-pressure stage cylinder element 110 and the low-pressure stage cylinder element 120 are arranged in sequence along the axial L. The inner side of the high-pressure stage cylinder part 110 is provided with a high-pressure stage inner cavity 111, and the end of the high-pressure stage cylinder part 110 away from the low-pressure stage cylinder part 120 is provided with a first air inlet 112 and a first exhaust port 113, wherein the high-pressure stage inner cavity 111 communicates with the first air inlet 112 and the first exhaust port 113 , and the first air inlet 112 and the first exhaust port 113 are disposed on the same side of the high-pressure stage inner cavity 111 . The first air inlet 112 and the first exhaust port 113 may respectively have an air inlet valve I and an air outlet valve E for controlling and regulating the flow of fluid into and out of the high-pressure stage inner cavity 111 . In addition, the first air inlet 112 and the first exhaust port 113 can be arranged on any two different sides of the high-pressure stage inner cavity 111 according to the design requirements of actual working conditions; the first air inlet 112 and the second air outlet can also be arranged An exhaust port 113 is provided with only one of the intake valve I or the exhaust valve E, or both of the intake valve I or the exhaust valve E, or both of the intake valve I and the exhaust valve E are not provided. .

The inner side of the low-pressure stage cylinder part 120 is provided with a low-pressure stage inner cavity 121, and the end of the low-pressure stage cylinder part 120 away from the high-pressure stage cylinder part 110 is provided with a second air inlet 122 and a second exhaust port 123, wherein the low-pressure stage inner cavity 121 communicates with the second intake port 122 and the second exhaust port 123 , and the second intake port 122 and the second exhaust port 123 are respectively disposed on opposite sides of the low-pressure stage inner cavity 121 . The second air inlet 122 and the second air outlet 123 may respectively have an air inlet valve I and an air outlet valve E for controlling and regulating the flow of fluid into and out of the inner cavity 121 of the low-pressure stage. In addition, the second air inlet 122 and the second exhaust port 123 can be arranged on the same side of the low-pressure stage inner cavity 121 or on any two different sides according to the design requirements of the actual working conditions; 122 and the second exhaust port 123 are only provided with the intake valve I or the exhaust valve E, or both the intake valve I and the exhaust valve E are not provided. In addition, in this embodiment, the low-pressure stage inner chamber 121 and the high-pressure stage inner chamber 111 communicate directly with each other, and the volume of the low-pressure stage inner chamber 121 is larger than the volume of the high-pressure stage inner chamber 111; At least one of the gas ports 122 has an intake valve I, and at least one of the first exhaust port 113 and the second exhaust port 123 has an exhaust valve E, or neither the intake valve I nor the exhaust valve E settings, however, the invention is not limited thereto.

The reciprocating assembly 200 can reciprocally be located in the cylinder block assembly 100 , and the reciprocating assembly 200 is located in the high-pressure stage inner chamber 111 and the low-pressure stage inner chamber 121 . The reciprocating assembly 200 includes a high-pressure piston part 210, a low-pressure piston part 220 and a piston rod 230, wherein the volume of the low-pressure piston part 220 is larger than that of the high-pressure piston part 210, and the high-pressure piston part 210 can reciprocally slide in the high-pressure stage The inner wall of the chamber 111 , and the low-pressure stage piston part 220 can slide back and forth on the inner wall of the low-pressure stage inner chamber 121 . The low-pressure piston part 220 and the high-pressure piston part 210 are spaced apart from each other along the long axis of the piston rod 230 . More specifically, the volume between the low-pressure piston part 220 and the high-pressure piston part 210 defines a balance cavity 240 . Specifically, the balance chamber 240 can receive the gas leaked from the high-pressure stage inner chamber 111 or the low-pressure stage inner chamber 121, and in this embodiment, the balance chamber 240 can receive the air from the reciprocating compressor 10 through the through-cavity flow channel 140. Any section of compressed air or an external air source will be further described later, and will not be repeated here.

In addition, the high-pressure piston part 210 and the low-pressure piston part 220 are coaxially fixed on the piston rod 230 , and a part thereof extends out of the cylinder block assembly 100 from one end of the low-pressure cylinder 120 . More specifically, the long axis of the piston rod 230 is parallel to the axial direction L, and the piston rod 230 passes through the low-pressure piston part 220 , the balance cavity 240 and the high-pressure piston part 210 in sequence. In this embodiment, the high-pressure piston part 210, the low-pressure piston part 220 and the piston rod 230 are combined into a one-stage differential piston assembly, and the reciprocating compressor 10 is a three-stage reciprocating compressor, wherein the low-pressure cylinder part 120 is the first The two-stage compression cylinder, the high-pressure stage cylinder part 110 is the third stage compression cylinder; in addition, the reciprocating compressor 10 can be designed as a two-stage reciprocating compressor according to different machine designs, and the low-pressure stage cylinder part 120 is the third stage compression cylinder. One-stage compression cylinder, the high-pressure stage cylinder part 110 is the second-stage compression cylinder; or the reciprocating compressor 10 is designed as other types of multi-stage reciprocating compressors to meet the requirements of different working conditions, the invention is not limited thereto. In addition, the reciprocating assembly 200 does not have any air valve, and the low-pressure stage piston part 220 does not have any air valve, so the low-pressure stage piston part 220 will not intentionally or actively release the gas in the balance chamber 240 to the low-pressure stage inner cavity 121; The same is true for the high-pressure piston part 210 .

In this embodiment, the external pipeline 300 is located outside the cylinder block assembly 100, and its two ends are respectively connected to the second exhaust port 123 and the first intake port 112. The external pipeline 300 is, for example, a fluid pipeline. However, the external pipeline 300 There is no limit to its form of expression.

As shown in FIG. 1 and FIG. 2 , the reciprocating compressor 10 further includes a cavity flow channel 140 . The cavity flow channel 140 communicates with the cylinder block assembly 100 and is arranged correspondingly, and communicates with the balance chamber 240 for inputting gas into the balance chamber 240 and discharging the gas in the balance chamber 240 . To further illustrate, the cavity flow channel 140 is an internal flow channel 141 opened inside the side wall of the low-pressure cylinder part 120 , and the internal flow channel 141 is located on one side of the low-pressure cylinder part 120 and corresponding to the balance chamber 240 . The cylinder block assembly 100 further includes an intake pipe 130, one end of the intake pipe 130 is connected to the low-pressure stage cylinder member 120, so that the intake pipe 130 is connected to the inner cavity of the low-pressure stage through the internal flow channel 141 and the second air inlet 122 in sequence. 121. In addition, one end of the inner channel 141 communicates with the balance chamber 240 , and the other end communicates with the low-pressure stage inner chamber 121 through the second air inlet 122 .

In addition, the intake pipe 130 can introduce the compressed gas of the first stage of the reciprocating compressor 10 or the external air source into the balance chamber 240 through the internal flow channel 141, so that the gas pressure in the low-pressure stage cylinder 120 is consistent with the balance chamber. The gas pressure difference in 240 decreases, the gas pressure difference in the high-pressure stage cylinder part 110 and the gas pressure in the balance chamber 240 decreases, and the pressure difference in the balance chamber 240 is reduced, so that the reciprocating compressor 10 is in operation. This reduces the leakage of the compressed gas in the low-pressure stage cylinder part 120 and the high-pressure stage cylinder part 110 flowing to the balance chamber 240, and at the same time recovers the leaked compressed gas through the through-cavity flow channel 140, thereby improving and enhancing the compression of the reciprocating compressor. efficiency.

More specifically, when the reciprocating compressor 10 is a three-stage reciprocating compressor, the low-pressure cylinder part 120 and the high-pressure cylinder part 110 are divided into a second-stage compression cylinder and a third-stage compression cylinder. At this time, the intake pipe 130 can introduce the first stage compressed gas of the reciprocating compressor 10 or the external air source into the balance chamber 240 through the internal flow channel 141, so that the gas pressure in the second stage compressed cylinder is the same as that in the balance chamber 240. The difference in gas pressure decreases, the difference between the gas pressure in the third compression cylinder and the gas pressure in the balance chamber 240 decreases, the pressure difference in the balance chamber 240 is reduced, and the low-pressure stage cylinder part 120 and the high-pressure stage cylinder part 110 are greatly reduced. operating leakage. The pressure of the external gas source is less than or equal to the pressure of the gas in the low-pressure stage inner chamber 121 (the second-stage compressed gas), and the gas pressure in the low-pressure stage inner chamber 121 is lower than the gas pressure in the high-pressure stage inner chamber 111 .

To further illustrate, when the reciprocating compressor 10 is a three-stage reciprocating compressor, the intake pipe 130 can introduce the compressed gas of the first stage of the reciprocating compressor 10 and enter the balance chamber 240 through the internal flow channel 141 . The gas pressure inside the balance chamber 240 rises from the atmospheric pressure to the pressure of the first-stage compressed gas, so that the gas pressure in the second-stage compression cylinder is the same as the gas pressure in the balance chamber 240 and the gas pressure in the third-stage compression cylinder. The gas pressure difference drops, reducing the pressure difference in the balance chamber 240. At this time, when the reciprocating assembly 200 reciprocates, the intake pipe 130 delivers the first stage of compressed gas through the inner channel 141 into the balance chamber 240 and the second stage of the compressed air cylinder.

In addition, the intake pipe 130 can also introduce an external air source into the balance chamber 240 through the internal flow channel 141. At this time, the gas pressure inside the balance chamber 240 rises from the atmospheric pressure to the gas pressure of the external air source, so that the second stage is compressed. The difference between the gas pressure in the cylinder and the balance chamber 240 and the gas pressure in the third-stage compression cylinder and the gas pressure in the balance chamber 240 decreases, reducing the pressure difference in the balance chamber 240 . Wherein, the pressure of the external gas source is less than or equal to the pressure of the gas in the inner chamber 121 of the low-pressure stage (compressed gas in the second stage). To further illustrate, when the external air source and the first-stage compressed gas are introduced into the internal flow channel 141 through the intake pipe 130 at the same time, the gas pressure of the external air source must be less than or equal to the pressure of the first-stage compressed gas to avoid external air The gas pressure of the source is too high to hinder the introduction of the first stage of compressed gas; and when the external gas source is introduced into the internal flow channel 141 through the intake pipe 130, and the first stage of compressed gas enters through the different part of the low-pressure stage cylinder 120 When the low-pressure stage inner cavity 121 is used, the gas pressure of the external gas source can be between the first stage compressed gas pressure and the gas (second stage compressed gas) pressure of the low-pressure stage inner cavity 121, and can also be equal to the first stage. Compressed gas pressure or the gas (second stage compressed gas) pressure of the inner cavity 121 of the low-pressure stage.

In addition, the reciprocating compressor 10 can be designed as a two-stage reciprocating compressor according to the design of different models, wherein the low-pressure stage cylinder part 120 is the first stage compression cylinder, and the high-pressure stage cylinder part 110 is the second stage compression cylinder. At this time, the intake pipe 130 can introduce an external air source into the balance chamber 240 through the internal flow channel 141, so that the difference between the gas pressure in the first compression cylinder and the gas pressure in the balance chamber 240 decreases, and the second compression cylinder The difference between the gas pressure in the chamber and the gas pressure in the balance chamber 240 decreases, reducing the pressure difference in the balance chamber 240 , and greatly reducing the operating leakage of the low-pressure stage cylinder part 120 and the high-pressure stage cylinder part 110 . The pressure of the external gas source is less than or equal to the gas pressure of the low-pressure stage inner cavity 121 (the first stage of compressed gas), and the gas pressure of the low-pressure stage inner cavity 121 is lower than the gas pressure of the high-pressure stage inner cavity 111 .

To further illustrate, when the reciprocating compressor 10 is a two-stage reciprocating compressor, the intake pipe 130 introduces an external air source and enters the balance chamber 240 through the internal flow channel 141. , through the internal channel 141 to transport external air into the balance chamber 240 or the first stage of the cylinder. At this time, the gas pressure inside the balance chamber 240 rises from the atmospheric pressure to the gas pressure of the external gas source, so that the gas pressure in the first compression cylinder is the same as the gas pressure in the balance chamber 240 and the gas pressure in the second compression cylinder is the same as the balance chamber 240. The gas pressure difference in the balance chamber decreases, reducing the pressure difference in the balance chamber 240 . Wherein, the gas pressure of the external gas source is less than or equal to the gas (first stage compressed gas) pressure of the low-pressure stage inner cavity 121, that is, the gas pressure of the external gas source can be between atmospheric pressure and the gas of the low-pressure stage inner cavity 121 ( The pressure of the first stage of compressed gas) can also be equal to the atmospheric pressure or the pressure of the gas (first stage of compressed gas) in the inner cavity 121 of the low pressure stage.

Next, the gas flow changes in the cylinder block assembly 100 will be described in detail when the reciprocating compressor 10 is running. As shown in FIG. 1, when the reciprocating assembly 200 moves downward from the high-pressure stage cavity 111 to compress the gas in the low-pressure stage cavity 121, the low-pressure stage cylinder part 120 performs a compression and exhaust process while the high-pressure stage cylinder part 110 performs an air intake process. program. To further illustrate, when the low-pressure stage cylinder part 120 performs the compression and exhaust process, the space in the low-pressure stage inner chamber 121 becomes smaller, so that the gas in the low-pressure stage inner chamber 121 (temporarily called the gas in the first chamber) is compressed by the low-pressure stage piston. Part 220 is compressed to increase its gas pressure and is discharged from the second exhaust port 123 to the external pipeline 300, while the high-pressure stage piston part 210 moves downward coaxially, so that the space in the high-pressure stage inner cavity 111 becomes larger, and the high-pressure stage The cylinder part 110 performs an air suction process, so that the gas in the first chamber flows from the low-pressure stage inner chamber 121 through the second exhaust port 123, the external pipeline 300, the first air inlet 112, and finally reaches the high-pressure stage inner chamber 111 , the gas in it is temporarily called the gas in the second chamber; at the same time, through the downward movement of the reciprocating component 200, the balance chamber 240 performs an air suction process, and the space of the balance chamber 240 in the low-pressure cylinder part 120 becomes larger, so that The first stage of compressed gas or external air source (temporarily referred to as the first external air) of the reciprocating compressor 10 enters the cylinder block assembly 100 through the intake pipe 130 , and then the first external air enters the balance chamber 240 after passing through the internal flow channel 141 , the gas in it is temporarily called the gas in the third cavity. In this way, because the gas in the third chamber improves the gas pressure in the balance chamber 240, the pressure difference between the balance chamber 240 and its two end chambers (ie, the high-pressure stage chamber 111 and the low-pressure stage chamber 121) can be reduced, and the pressure of the high-pressure stage can be reduced. Gas leakage in the inner cavity 111 and the low-pressure level inner cavity 121 .

As shown in FIG. 2 , when the reciprocating assembly 200 moves upward from the low-pressure stage cavity 121 to compress the high-pressure stage cavity 111 , the high-pressure stage cylinder part 110 performs a compression and exhaust process, and the low-pressure stage cylinder part 120 performs an air intake process. To further illustrate, when the high-pressure stage piston part 210 moves upward, the space in the high-pressure stage inner chamber 111 becomes smaller, so that the gas in the second chamber in the high-pressure stage inner chamber 111 is sent out of the cylinder block assembly through the first exhaust port 113 100, while the low-pressure stage piston part 220 moves upward coaxially, making the space in the low-pressure stage inner chamber 121 larger, and the low-pressure stage cylinder part 120 performs the suction process, so that the first stage of compressed gas or external air source (temporarily called The second external air) flows through the internal flow channel 141, the second air inlet 122 in sequence through the air inlet pipe 130, and finally reaches the inner chamber 121 of the low-pressure stage; at the same time, the reciprocating assembly 200 moves upward to make the balance chamber 240 carries out the exhaust process, the space of the balance chamber 240 in the low-pressure stage cylinder part 120 becomes smaller, so that the gas in the third chamber is discharged from the balance chamber 240, and then is sent into the low-pressure stage inner chamber 121 through the internal flow channel 141, and mixed with the second external air to form the above-mentioned first cavity air. In this way, by repeating the above-mentioned actions in FIG. 1 and FIG. 2 , the reciprocating component 200 can repeatedly perform the work of gas compression.

It is worth mentioning that, with the long-term operation of the reciprocating compressor 10, the sealing performance of the reciprocating assembly 200 will gradually wear out. The gas inside will leak during the reciprocating motion, but due to the design of the low pressure difference in the balance chamber 240 of this invention, the leakage of the high-pressure inner chamber 111 and the low-pressure inner chamber 121 is greatly reduced, and through the through chamber The flow channel 140 is designed to recover the gas in the third chamber to the low-pressure stage inner chamber 121, which can reduce the compression loss and further improve the compression efficiency of the reciprocating compressor.

FIG. 3 and FIG. 4 are schematic diagrams of continuous operation of the reciprocating compressor 11 according to the second embodiment of the present invention, respectively. As shown in Figures 3 to 4, the reciprocating compressor 11 of this embodiment is substantially the same as the reciprocating compressor 10 of the above-mentioned embodiment, the difference is that the through-cavity flow channel 140A is a The outer flow channel 142 , one end of the outer flow channel 142 is connected with the cylinder block assembly 100 , and communicates with the balance chamber 240 through the inner design of the low-pressure stage cylinder part 120 . In addition, the other end of the external flow passage 142 communicates with the external pipeline 300 , so that the gas in the external pipeline 300 can bypass the external flow passage 142 and flow to the balance chamber 240 in the cylinder block assembly 100 . Wherein, the external flow channel 142 is, for example, a fluid pipeline, a casing hole of the reciprocating compressor 10 or a combination of the two, however, the external pipeline 300 is not limited to its form. Wherein, the outer pipeline 300 is provided with a cooler (not shown in the figure) for lowering the temperature, and the outer flow channel 142 communicates with the outer pipeline 300 and is located at the downstream of the cooler, so as to reduce the gas entering the balance chamber 240 and the high-pressure stage inner chamber 111 temperature.

Next, the gas flow changes in the cylinder block assembly 100 will be described in detail when the reciprocating compressor 11 is running. As shown in FIG. 3, when the reciprocating assembly 200 moves downward from the high-pressure stage cavity 111 to compress the gas in the low-pressure stage cavity 121, the low-pressure stage cylinder element 120 performs a compression and exhaust process while the high-pressure stage cylinder element 110 performs an air intake process. program. To further illustrate, when the low-pressure stage cylinder part 120 performs the compression and exhaust process, the space in the low-pressure stage inner chamber 121 becomes smaller, and the gas in the first chamber in the low-pressure stage inner chamber 121 is compressed by the low-pressure stage piston part 220 The gas pressure is increased and discharged from the second exhaust port 123 to the external pipeline 300, while the high-pressure stage piston part 210 moves downward coaxially, so that the space in the high-pressure stage inner cavity 111 becomes larger, and the high-pressure stage cylinder part 110 Inhalation procedure, so that the gas in the first chamber flows from the low-pressure stage inner chamber 121 through the second exhaust port 123, the external pipeline 300, the cooler (not shown in the figure), the first air inlet 112, and finally reaches the high-pressure stage In the first-stage inner cavity 111, the gas in it is temporarily called the gas in the second cavity; at the same time, through the downward movement of the reciprocating component 200, the balance cavity 240 performs an air suction process, and the balance cavity 240 is in the low-pressure stage cylinder part 120. The space becomes larger, so that the gas in the first cavity of the low-pressure stage inner cavity 121 enters the cylinder block assembly 100 through the external pipeline 300, the cooler (not shown in the figure) and the external flow channel 142, and then the gas in the first cavity passes through the low-pressure stage cylinder The interior of the element 120 is designed to enter the balance chamber 240 to become the gas in the third chamber. In this way, because the gas in the third chamber improves the gas pressure in the balance chamber 240, the pressure difference between the balance chamber 240 and its two end chambers (ie, the high-pressure stage chamber 111 and the low-pressure stage chamber 121) can be reduced, and the pressure of the high-pressure stage can be reduced. The gas in the inner cavity 111 and the low-pressure level inner cavity 121 leaks. Wherein, the gas pressure in the third cavity is almost equal to the gas pressure in the first cavity, and the gas pressure in the first cavity is lower than the gas pressure in the second cavity.

As shown in FIG. 4 , when the reciprocating assembly 200 moves upward from the low-pressure stage cavity 121 to compress the high-pressure stage cavity 111 , the high-pressure stage cylinder part 110 performs a compression and exhaust process, and the low-pressure stage cylinder part 120 performs an air intake process. To further illustrate, when the high-pressure stage piston part 210 moves upward, the space in the high-pressure stage inner chamber 111 becomes smaller, so that the gas in the second chamber in the high-pressure stage inner chamber 111 is sent out of the cylinder block assembly through the first exhaust port 113 100, while the low-pressure stage piston part 220 moves upward coaxially, making the space in the low-pressure stage inner chamber 121 larger, and the low-pressure stage cylinder part 120 performs the suction process, so that the first stage of compressed gas or external air source (temporarily called The second external air) flows into the low-pressure stage inner chamber 121 through the second air inlet 122; at the same time, through the upward movement of the reciprocating assembly 200, the balance chamber 240 is exhausted, and the balance chamber 240 is in the low-pressure stage cylinder part 120 The space inside becomes smaller, so that the gas in the third chamber is discharged from the balance chamber 240, and then sent to the external pipeline 300 through the external flow channel 142, and mixed with the gas in the first chamber. In this way, by repeating the above-mentioned actions in FIG. 3 and FIG. 4 , the reciprocating component 200 can repeatedly perform the work of gas compression.

FIG. 5 and FIG. 6 are respectively schematic diagrams of continuous operation of the reciprocating compressor 11 according to the third embodiment of the present invention. As shown in Figures 5 to 6, the reciprocating compressor 12 of this embodiment is substantially the same as the reciprocating compressor 11 of the second embodiment above, and the through-cavity flow channel 140B is also located outside the cylinder block assembly 100 The difference of the external flow passage 143 is that the external flow passage 143 introduces external air, one end of the external flow passage 143 is connected to the cylinder block assembly 100, and the other end is connected to an external air source G (the external air is temporarily called the third external air) communication, so that the third external air can enter or exit the balance chamber 240 of the cylinder block assembly 100 through the external flow channel 143; this design can adjust the gas pressure in the balance chamber 240 at any time according to the working conditions, and can adjust the high pressure in real time The gas leakage in the stage cavity 111 and the low-pressure stage cavity 121. Wherein, the third external gas pressure may be less than or equal to the gas pressure in the first cavity, and the gas pressure in the first cavity is lower than the gas pressure in the second cavity.

To further illustrate, when the reciprocating compressor 10 is a three-stage reciprocating compressor, the pressure of the third external air is between the pressure of the compressed gas in the first stage and the gas in the inner chamber 121 of the low-pressure stage (such as the compressed gas in the second stage). ) pressure, it can also be equal to the pressure of the compressed gas in the first stage or the pressure of the gas in the inner chamber 121 of the low-pressure stage (such as the compressed gas in the second stage); and when the reciprocating compressor 10 is designed as a two-stage reciprocating compressor, this When the pressure of the third external gas is between the atmospheric pressure and the pressure of the gas in the inner cavity 121 of the low-pressure stage (the first stage of compressed gas), it can also be equal to the atmospheric pressure or the gas of the inner cavity 121 of the low-pressure stage (the first stage of compressed gas) pressure.

It should be understood that the above-mentioned reciprocating compressors 10 , 11 , 12 are, for example, water-cooled oil-free reciprocating compressors, which may be two-stage reciprocating compressors or three-stage reciprocating compressors, however, the present invention is not limited thereto. In addition, the above-mentioned intake valve I and exhaust valve E use various existing air valves; the cylinder blocks of the high-pressure stage cylinder 110 and the low-pressure stage cylinder 120 can be set to vertical, horizontal, angled, symmetrical, etc. Any form, and the cooling method can adopt any cooling method such as water cooling, air cooling, natural cooling, etc., and can be oil-free or oil-lubricated.

In this way, through the above structure, the reciprocating compressor introduces a compressed gas or an external air source to reduce the pressure difference in the balance chamber, thereby reducing the gas flow in the low-pressure stage cylinder part and the high-pressure stage cylinder part to balance The leakage of the cavity is improved, and the leaked compressed gas is recovered through the flow channel of the cavity, thereby improving the compression efficiency of the reciprocating compressor.

Finally, the embodiments disclosed above are not intended to limit this creation. Anyone who is familiar with this technique can make various changes and modifications without departing from the spirit and scope of this creation, and all of them can be protected in this creation. creation. Therefore, the scope of protection of this creation should be defined by the scope of the attached patent application.

10, 11, 12: Reciprocating compressors

100: Cylinder block assembly

110: High pressure cylinder parts

111: High pressure inner cavity

112: The first air inlet

113: The first exhaust port

120: Low-pressure cylinder parts

121: Low-pressure inner cavity

122: Second air inlet

123: Second exhaust port

130: Intake pipe

140, 140A, 140B: cavity flow channel

141: Internal runner

142, 143: external runner

200: Reciprocating components

210: High pressure piston part

220: Low-pressure piston part

230: piston rod

240: balance cavity

300: external pipeline

E: exhaust valve

G: External air source

I: intake valve

L: Axial

In order to make the above-mentioned and other purposes, features, advantages and embodiments of this creation more obvious and easy to understand, the description of the accompanying drawings is as follows: Figure 1 and Figure 2 are schematic diagrams of the continuous operation of the reciprocating compressor in the first embodiment of the invention; Figure 3 and Figure 4 are schematic diagrams of the continuous operation of the reciprocating compressor of the second embodiment of the present invention; and Fig. 5 and Fig. 6 are schematic diagrams of continuous operation of the reciprocating compressor according to the third embodiment of the present invention, respectively.

10: Reciprocating compressor

100: Cylinder block assembly

110: High pressure cylinder parts

111: High pressure inner cavity

112: The first air inlet

113: The first exhaust port

120: Low-pressure cylinder parts

121: Low-pressure inner cavity

122: Second air inlet

123: Second exhaust port

130: Intake pipe

140: cavity flow channel

141: Internal runner

200: Reciprocating components

210: High pressure piston part

220: Low-pressure piston part

230: piston rod

240: balance cavity

300: external pipeline

E: exhaust valve

I: intake valve

L: coaxial direction

Claims (13)

A reciprocating compressor, comprising: a cylinder block assembly, which is formed by connecting a high-pressure stage cylinder part and a low-pressure stage cylinder part, and the high-pressure stage cylinder part has a first air inlet and a first exhaust port And a high-pressure stage inner cavity communicating with the first air inlet and the first exhaust port, the low-pressure stage cylinder part has a second air inlet, a second exhaust port communicating with the second air inlet, and A low-pressure stage inner cavity communicating with the high-pressure stage, the second air inlet and the second exhaust port; an external pipeline, the two ends of the external pipeline are respectively connected to the cylinder block assembly, and the external pipelines are respectively connected to The second exhaust port and the first air intake port; and a reciprocating assembly reciprocally located in the cylinder block assembly, including: a high-pressure stage piston part located in the high-pressure stage inner chamber; a low-pressure stage piston part , located in the inner chamber of the low-pressure stage, and defining a balance chamber with the high-pressure stage piston part; and a piston rod, the high-pressure stage piston part and the low-pressure stage piston part are coaxially fixed on the piston rod, and A portion of the piston rod protrudes from the cylinder block assembly from one end of the low pressure stage cylinder member. The reciprocating compressor as described in claim 1 further includes: a through-chamber flow passage communicated with the cylinder block assembly and correspondingly arranged, and communicated with the balance chamber. The reciprocating compressor as described in claim 2, wherein the The chamber flow channel is an internal flow channel opened on the low-pressure stage cylinder part, the internal flow channel is located on one side of the low-pressure stage cylinder part, and is arranged corresponding to the balance chamber; and the cylinder block assembly further includes an intake pipe , one end of the intake pipe is connected to the low-pressure stage cylinder, and the intake pipe communicates with the inner chamber of the low-pressure stage through the internal flow channel. The reciprocating compressor according to claim 3, wherein one end of the internal flow passage communicates with the balance cavity, and the other end communicates with the intake pipe and the low-pressure stage inner cavity through the second intake port. The reciprocating compressor as claimed in claim 3, wherein the intake pipe is used to introduce a first stage of compressed gas or an external gas source into the cylinder block assembly. The reciprocating compressor as described in Claim 2, wherein the cavity flow channel is an external flow channel, one end of the external flow channel is connected to the cylinder block assembly, and the external flow channel communicates with the balance cavity. The reciprocating compressor as claimed in claim 6, wherein the other end of the external flow passage communicates with the external pipeline. The reciprocating compressor as claimed in claim 6, wherein the external flow channel is used to introduce an external air source into the cylinder block assembly. The reciprocating compressor as described in Claim 5 or 8, wherein the pressure of the external gas source is less than or equal to the gas pressure of the inner cavity of the low-pressure stage, and the gas pressure of the inner cavity of the low-pressure stage is lower than the gas of the inner cavity of the high-pressure stage pressure. The reciprocating compressor according to claim 1, wherein the reciprocating compressor is a two-stage reciprocating compressor or a three-stage reciprocating compressor. The reciprocating compressor according to claim 10, wherein the low-pressure stage cylinder is a first-stage compression cylinder, and the high-pressure stage cylinder is a second-stage compression cylinder. The reciprocating compressor according to claim 10, wherein the low-pressure stage cylinder is a second-stage compression cylinder, and the high-pressure stage cylinder is a third-stage compression cylinder. The reciprocating compressor as claimed in claim 1, wherein a cooler for cooling is provided on the external pipeline.

Images