Piston compressor

Abstract

A piston compressor, comprising: a cylinder body, having a first injection inlet and a first output port on a side wall thereof; a piston arranged in the cylinder body and configured to reciprocate in the cylinder body; a pair of first closed sealing rings arranged at intervals in an extending direction of the cylinder body, the first closed sealing rings arranged at intervals, an inner side wall of the cylinder body and an outer side wall of the piston surrounding a first sealing chamber, the first sealing chamber isolating lubricating liquid inside from gas in the cylinder body; a first input pipeline in communication with the first injection inlet and configured to inject lubricating liquid into the first sealing chamber through the first injection inlet; and a first output pipeline in communication with the first output port and configured to discharge lubricating liquid of the first sealing chamber through the first output port, so as to ensure lubricating movement of the piston in the cylinder and avoid leakage of the lubricating liquid into the cylinder.

Description

Technical Field

[0001] This disclosure relates to the field of compressor technology, and more particularly to a reciprocating compressor. Background Technology

[0002] A reciprocating compressor consists of a crankshaft driving a connecting rod, which in turn drives a piston, causing the piston to reciprocate. This piston motion causes periodic changes in the volume within the cylinder. When the cylinder volume increases, the intake valve opens and the exhaust valve closes, allowing low-pressure gas to be drawn in, completing the intake process. When the cylinder volume decreases, the exhaust valve opens and the intake valve closes, completing the compression process and expelling high-pressure gas. Typically, piston rings seal the gap between the piston and the cylinder, isolating gas from the sides of the piston within the cylinder. Double-acting cylinders also require packing material to seal the gap between the piston rod and the cylinder. The seals are lubricated with either oil or oil-free lubrication. For applications where gas purity requirements are not high, oil lubrication is generally used to ensure a good seal and extend the lifespan of the seals. In this case, lubricating oil injected through small holes in the cylinder sidewall can pass through the piston rings and enter the cylinder, contaminating the gas inside. For applications requiring high gas purity, oil-free lubrication solutions using self-lubricating sealing materials are employed. However, in oil-free compressors, the sealing rings and cylinders or piston rods experience prolonged high-speed dry friction. Under high pressure and high temperature conditions, the lifespan of the seals is difficult to guarantee. Therefore, oil-free compressors generally struggle to achieve discharge pressures above 10 MPa.

[0003] With industrial development, the requirements for the pressure and purity of compressed gases are becoming increasingly stringent. For example, hydrogen refueling stations require hydrogen purity of 99.97%, and the pressure needs to range from 20 to 90 MPa depending on the specific scenario. Traditional oil-free sealing methods and materials cannot meet these requirements. Summary of the Invention

[0004] Embodiments of this disclosure provide a reciprocating compressor, the reciprocating compressor comprising:

[0005] A cylinder body, wherein a first injection port and a first output port are provided on the side wall of the cylinder body;

[0006] The piston is located in the cylinder body and reciprocates within the cylinder body.

[0007] A pair of first sealing rings are spaced apart in the extending direction of the cylinder body. The spaced first sealing rings, the inner side wall of the cylinder body, and the outer side wall of the piston form a first sealing chamber. The first sealing chamber isolates the lubricant inside from the gas inside the cylinder body.

[0008] A first input line is connected to the first injection port and configured to inject lubricant into the first sealed chamber through the first injection port;

[0009] A first output pipe is connected to the first output port and is configured to discharge the lubricating fluid from the first sealed chamber through the first output port.

[0010] In some embodiments, the reciprocating compressor further includes:

[0011] A first support ring is disposed between spaced first closed sealing rings and is configured to bear the weight of the piston and maintain the spacing between the inner wall of the cylinder body and the outer wall of the piston in the first sealed chamber.

[0012] In some embodiments, a first annular groove and a second annular groove are spaced apart on the outer wall of the piston. A first sealing ring is spaced apart and is disposed in the first annular groove, and protrudes from the outer wall of the piston radially toward the inner wall of the cylinder body. A first support ring is disposed in the second annular groove and protrudes from the outer wall of the piston radially toward the inner wall of the cylinder body.

[0013] In some embodiments, the inner wall of the cylinder body is provided with a third annular groove and a fourth annular groove located between the spaced third annular grooves. The spaced first sealing rings are respectively disposed in the spaced third annular grooves and protrude from the inner wall of the cylinder body toward the outer wall of the piston in the radial direction of the cylinder body. The first support ring is disposed in the fourth annular groove and protrudes from the inner wall of the cylinder body toward the outer wall of the piston in the radial direction of the cylinder body.

[0014] In some embodiments, the pressure of the lubricant in the first sealed chamber is greater than the gas pressure in the cylinder body to prevent gas in the cylinder body from entering the first sealed chamber.

[0015] In some embodiments, the reciprocating compressor further includes:

[0016] A first check valve is disposed on the first input pipeline; and

[0017] An overflow valve is installed on the first output pipeline.

[0018] In some embodiments, the reciprocating compressor further includes:

[0019] The cylinder neck is connected to the cylinder body, and the side wall of the cylinder neck has a second injection port and a second output port.

[0020] A piston rod is inserted through the cylinder neck, and one end of the piston rod is fixedly connected to the piston.

[0021] A pair of second sealing rings are spaced apart in the extending direction of the cylinder neck. The spaced second sealing rings, the inner sidewall of the cylinder neck, and the outer sidewall of the piston rod form a second sealing chamber. The second sealing chamber isolates the lubricant inside from the gas inside the cylinder body.

[0022] The second input line is connected to the second injection port and is configured to inject lubricating fluid into the second sealed chamber through the second injection port;

[0023] The second output pipeline is connected to the second output port and is configured to discharge the lubricating fluid from the second sealed chamber through the second output port.

[0024] In some embodiments, a fifth annular groove is provided at intervals on the inner sidewall of the cylinder neck, and a second sealing ring is provided at intervals in the fifth annular groove, and protrudes from the inner sidewall of the cylinder neck toward the outer sidewall of the piston rod in the radial direction of the cylinder neck.

[0025] In some embodiments, a sixth annular groove is provided at intervals on the outer wall of the piston rod, and second sealing rings are respectively provided at intervals in the sixth annular grooves, and protrude from the outer wall of the piston rod toward the inner wall of the cylinder neck in the radial direction of the piston rod.

[0026] In some embodiments, the pressure of the lubricant in the second sealed chamber is greater than the gas pressure inside the cylinder body, in order to prevent gas from the cylinder body from entering the second sealed chamber.

[0027] The reciprocating compressor further includes: a second one-way valve disposed on the second input pipeline; and another relief valve disposed on the second output pipeline.

[0028] Compared with related technologies, the embodiments of this disclosure have at least the following technical effects:

[0029] By designing a first sealed chamber and a first input pipeline and a first output pipeline connected to the first sealed chamber in the cylinder, the piston in the cylinder is lubricated, while preventing lubricant from leaking into the cylinder, ensuring the purity of the gas in the cylinder, and extending the service life of the piston compressor. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a reciprocating compressor provided in some embodiments of this disclosure;

[0032] Figure 2 This is a schematic diagram of the structure of a reciprocating compressor provided in some embodiments of this disclosure;

[0033] Figure 3 This is a schematic diagram of the structure of a reciprocating compressor provided in some embodiments of this disclosure;

[0034] Figure 4 This is a schematic diagram of the structure of a piston compressor provided in some embodiments of this disclosure. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this disclosure clearer, the disclosure will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0036] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. The singular forms “a,” “the,” and “the” used in the embodiments of this disclosure and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise. The prefixes “first” and “second” preceding the terms are for ease of description and do not indicate any order or relative importance between the terms.

[0037] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0038] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the article or device that includes said element.

[0039] This disclosure provides a piston compressor, comprising: a cylinder body having a first injection port and a first output port on its side wall; a piston disposed in the cylinder body and configured to reciprocate within the cylinder body; a pair of first sealing rings spaced apart along the extending direction of the cylinder body, the spaced first sealing rings, the inner side wall of the cylinder body, and the outer side wall of the piston forming a first sealed chamber, the first sealed chamber isolating the lubricating fluid inside from the gas inside the cylinder body; a first input pipe connected to the first injection port and configured to inject lubricating fluid into the first sealed chamber through the first injection port; and a first output pipe connected to the first output port and configured to discharge the lubricating fluid from the first sealed chamber through the first output port.

[0040] This disclosure, by designing a first sealed chamber in the cylinder and a first input pipeline and a first output pipeline connected to the first sealed chamber, ensures the lubrication of the piston movement in the cylinder while preventing lubricant leakage into the cylinder, thus ensuring the purity of the gas in the cylinder and extending the service life of the piston compressor.

[0041] The optional embodiments of this disclosure are described in detail below with reference to the accompanying drawings.

[0042] Figure 1 This is a schematic diagram of the structure of a piston compressor provided in some embodiments of this disclosure.

[0043] like Figure 1 As shown, some embodiments of this disclosure provide a piston compressor 100, which includes: a cylinder body 11, a piston 21, a pair of first sealing rings 31, a first input pipe 41, and a first output pipe 42.

[0044] The cylinder body 11 has a first injection port and a first output port on its side wall. The cylinder body 11 is, for example, a barrel-shaped structure with accommodating space.

[0045] The piston 21 is disposed in the cylinder body 11 and reciprocates within the cylinder body 11. Specifically, one end of the piston 21 is connected to the piston rod 22, for example. Under the action of an external force, the piston rod 22 drives the piston 21 to reciprocate within the cylinder body 11, thereby compressing the gas in the cylinder body 11.

[0046] A pair of first sealing rings 41 are spaced apart along the extending direction of the cylinder body 11. The spaced-apart first sealing rings 41, the inner wall of the cylinder body 11, and the outer wall of the piston 21 form a first sealing chamber 51. The first sealing chamber 51 isolates the lubricating fluid inside from the gas inside the cylinder body 11. The first sealing chamber 51 surrounds the piston 21. The spaced-apart first sealing rings 41 provide a sealing effect, preventing the lubricating fluid inside the first sealing chamber 51 from leaking into the cylinder body 11 and contaminating the gas inside the cylinder body 11. The first sealing rings 41 also prevent the gas from the cylinder body 11 from entering the first sealing chamber 51, thus preventing it from occupying the space for the lubricating fluid and reducing the lubrication effect during piston reciprocating motion.

[0047] The first input pipe 61 is connected to the first injection port and is configured to inject lubricating fluid into the first sealed chamber through the first injection port. The first output pipe 62 is connected to the first output port and is configured to discharge the lubricating fluid from the first sealed chamber through the first output port. The lubricating fluid serves a lubricating function, preventing dry friction between the piston and cylinder and extending the service life of the compressor.

[0048] The lubricating fluid in the first sealed chamber 51 is constantly renewed. The lubricating fluid is continuously injected into the first sealed chamber 51 through the first inlet via the first input pipe 61, and at the same time flows out of the first sealed chamber 51 through the first output pipe 62 via the first output port, so as to ensure the lubrication effect of the compressor in real time.

[0049] Some embodiments of this disclosure, by designing a first sealed chamber in the cylinder and a first input pipeline and a first output pipeline communicating with the first sealed chamber, ensure the lubrication of the piston movement in the cylinder while preventing lubricant leakage into the cylinder, ensuring the purity of the gas in the cylinder, and extending the service life of the piston compressor.

[0050] In some embodiments, such as Figure 1 As shown, the reciprocating compressor also includes a crankshaft 81, a connecting rod 82, and a crosshead 83. A crosshead 83 is located at the end of the piston rod 22 furthest from the piston 21. The crosshead 83 is pivotally connected to one end of the connecting rod 82, and the other end of the connecting rod 82 is pivotally connected to the free end of the crankshaft 81. The crankshaft 81 can rotate under the action of an external power source, such as an electric motor. The rotational motion of the crankshaft 81 drives the piston rod 22 and the piston to perform reciprocating motion via the connecting rod 82 and the crosshead 83.

[0051] In some embodiments, the reciprocating compressor 100 further includes a first support ring 61 disposed between spaced-apart first sealing rings 31, forming a support on the inner wall of the cylinder body and the outer wall of the piston, configured to support the weight of the piston and maintain the spacing between the inner wall of the cylinder body and the outer wall of the piston in the first sealed chamber 51. The first support ring 61 does not necessarily perform a sealing function, allowing the lubricating fluid in the first sealed chamber 51 to flow freely. In some embodiments, the surface of the first support ring 61 facing the inner wall of the cylinder body or the surface facing the outer wall of the piston is provided with grooves that allow the lubricating fluid to flow freely.

[0052] Those skilled in the art will understand that the number of first support rings 61 is not limited to one, but can be more than one, and they serve to support the weight of the piston and guide it.

[0053] In some embodiments, such as Figure 1 The piston 21 has a first annular groove and a second annular groove located between the spaced-apart first annular grooves on its outer sidewall. First sealing rings 31 are respectively disposed in the spaced-apart first annular grooves and protrude radially from the inner sidewall of the cylinder body 11 towards the piston's outer sidewall. A first support ring 61 is disposed in the second annular groove and protrudes radially from the inner sidewall of the cylinder body towards the piston's outer sidewall. In other words, both the first sealing ring 31 and the first support ring 61 are disposed on the piston 21 and move relative to the inner sidewall of the cylinder body 11 as the piston moves.

[0054] In some embodiments, the spaced-apart first sealing rings 31 ensure the airtightness of the first sealing chamber 51, isolating the lubricant therein from the gas in the cylinder body 11. This ensures lubrication of the piston movement in the cylinder while preventing lubricant leakage into the cylinder body, thus maintaining the purity of the gas in the cylinder body. The pressure of the lubricant in the first sealing chamber 51 is greater than the gas pressure in the cylinder body, preventing gas from the cylinder from entering the first sealing chamber 51 and ensuring effective lubrication between the piston and the cylinder body.

[0055] In some embodiments, the reciprocating compressor 100 further includes a first one-way valve 411 and an overflow valve 421. The first one-way valve 411 is disposed on the first input line 41, ensuring that the lubricating fluid transmitted in the first input line 41 can only flow in one direction. This prevents the lubricating fluid injected into the first sealed chamber 51 via the first input line 41 from flowing back. To ensure that the lubricating fluid in the first sealed chamber 51 has sufficient pressure, a lubricating fluid pump is connected to the end of the first input line 41 away from the first injection port, pumping the lubricating fluid into the first sealed chamber 51 at sufficient pressure.

[0056] An overflow valve 421 is installed on the first output pipe 42. Its function is to maintain the pressure of the lubricating fluid in the first sealed chamber 51 within a stable and reasonable range—always higher than the pressure of the gas in the cylinder, but not excessively high. If the pressure of the lubricating fluid in the first sealed chamber 51 is too high, it may leak into the cylinder body 11, contaminating the gas in the cylinder. When the pressure of the lubricating fluid in the first sealed chamber 51 reaches a first threshold, the lubricating fluid in the first sealed chamber 51 will overflow through the overflow valve 421, ensuring the normal pressure of the lubricating fluid in the first sealed chamber 51. In some embodiments, the lubricating fluid overflowing through the overflow valve 421 can flow into a recycling container for recycling and reuse, and the lubricating fluid output through the first output pipe 42 can also flow into a recycling container for recycling and reuse.

[0057] In some embodiments, such as Figure 1 As shown, the cylinder body 11 has an intake port and an exhaust port. An intake valve and an exhaust valve are respectively installed at the intake port and exhaust port. The intake valve and exhaust valve open and close to allow the cylinder body 10 to communicate with or isolate itself from the outside environment through the intake port and exhaust port. Specifically, at the end of the cylinder body 11 furthest from the piston rod 22, for example... Figure 1 At the left end shown, a first air inlet and a first exhaust outlet are provided, and a first intake valve 111 and a first exhaust valve 112 are respectively provided at the first air inlet and the first exhaust outlet. At the end of the cylinder body 11 near the piston rod 22, for example... Figure 1 At the right end shown, a second air inlet and a second exhaust outlet are provided, and a second air inlet valve 113 and a second exhaust valve 114 are respectively provided at the second air inlet and the second exhaust outlet.

[0058] When piston 21 moves toward the left end of cylinder body 11, the first intake valve 111 and the first exhaust valve 112 close, and piston 21 compresses the gas in the left space of cylinder body 11. At the same time, the second intake valve 113 opens and the second exhaust valve 114 closes, allowing outside gas to enter the right space of cylinder body 11 through the second intake port. As piston 21 compresses the gas in the left side of cylinder body 11, when the pressure of the gas in the left space is sufficiently high, the first exhaust valve 112 opens under its pressure, and the high-pressure gas in the left space is discharged through the first exhaust port.

[0059] When piston 21 moves toward the right end of cylinder body 11, the second intake valve 113 and the second exhaust valve 114 close, and piston 21 compresses the gas in the right space of cylinder body 11. At the same time, the first intake valve 111 opens and the first exhaust valve 112 closes, allowing outside gas to enter the left space of cylinder body 11 through the first intake port. As piston 21 compresses the gas in the right space of cylinder body 11, when the pressure of the gas in the right space is sufficiently high, the second exhaust valve 114 opens under its pressure, and the high-pressure gas in the right space is discharged through the second exhaust port.

[0060] As the piston 21 reciprocates left and right within the cylinder body 11, the gas in the left and right spaces of the cylinder body 11 is alternately compressed.

[0061] In some embodiments, during the reciprocating motion of the piston 21 within the cylinder body 11, the first sealing chamber 51 remains in communication with the first input pipe 41 and the first output pipe 42 via the first injection port and the first output port, respectively. That is, the first sealing chamber 51 has sufficient length in the axial direction of the cylinder body 11 (at least exceeding one piston stroke), so that even when the piston 21 moves to the leftmost and / or rightmost end within the cylinder body 11, the first sealing chamber 51 remains in communication with the first input pipe 41 and the first output pipe 42 via the first injection port and the first output port, respectively. This prevents lubricant leakage into the cylinder body 11 and avoids gas contamination.

[0062] In some embodiments, the lubricant may be, for example, lubricating oil, water, emulsion, etc., and may be selected according to the type of compressed gas and the required gas purity. In some embodiments, the lubricant may also be a liquid that is not easily volatile and is easily separated, such as an ionic liquid.

[0063] In some embodiments, the first sealing ring 31 can be a one-way seal or a two-way seal, including but not limited to Glyd rings, Step seals, Pan-lock seals, and various combination seals.

[0064] Figure 2 This is a schematic diagram of the structure of a piston compressor provided in some embodiments of this disclosure. Figure 2 The illustrated embodiments and Figure 1 The structures of the two embodiments are basically the same, and the similarities will not be repeated here. The following mainly introduces the differences between the two.

[0065] like Figure 2 As shown, with Figure 1Unlike the illustrated embodiment, the first sealing ring 31 and the first support ring 61 are not disposed on the piston 21, but rather on the inner wall of the cylinder body 11. Specifically, the inner wall of the cylinder body 11 is provided with a third annular groove and a fourth annular groove located between the spaced-apart third annular grooves. The spaced-apart first sealing rings 31 are respectively disposed in the spaced-apart third annular grooves and protrude radially toward the outer wall of the piston from the inner wall of the cylinder body. The first support ring 61 is disposed in the fourth annular groove and protrudes radially toward the outer wall of the piston from the inner wall of the cylinder body. That is, both the first sealing ring 31 and the first support ring 61 are disposed on the cylinder body 11, and they move relative to the outer wall of the piston 21 as the piston moves. In this embodiment, the piston 21 adopts a plunger structure, which is easy to manufacture and assemble. The plunger must ensure a certain axial length to ensure that it always forms a sealing cavity with the cylinder and the sealing rings during reciprocating motion.

[0066] In some embodiments, such as Figure 1 and Figure 2 As shown, the piston compressor 100 also includes a cylinder neck 12, a pair of second sealing rings 32, a second input pipe 71, and a second output pipe 72.

[0067] The cylinder neck 12 and the cylinder body 11 constitute the cylinder of the piston compressor 100. The cylinder neck 12 is connected to the cylinder body 11, and the piston rod 22, which is connected to the piston 21, passes through the cylinder neck 12 and is connected to the crosshead 83. The piston rod 22 reciprocates relative to the cylinder neck 12, and its lubrication and airtightness must be ensured at the same time.

[0068] The cylinder neck 12 has a second injection port and a second output port on its side wall. A piston rod 22 passes through the cylinder neck 12, and one end of the piston rod 22 is fixedly connected to the piston 21. A pair of second sealing rings 32 are spaced apart along the extension direction of the cylinder neck 22. The spaced-apart second sealing rings 32, the inner side wall of the cylinder neck 22, and the outer side wall of the piston rod 12 form a second sealing chamber 52. The second sealing chamber 52 isolates the lubricating fluid inside from the gas inside the cylinder body 11. The second sealing chamber 52 surrounds the piston rod 22. The spaced-apart second sealing rings 32 provide a sealing effect, preventing the lubricating fluid inside the second sealing chamber 52 from leaking into the cylinder body 11 and contaminating the gas in the cylinder body 11. The second sealing rings 32 also prevent the gas from the cylinder body 11 from entering the second sealing chamber 52, occupying the space for the lubricating fluid, and reducing the lubrication effect during piston reciprocating motion.

[0069] The second input pipe 71 is connected to the second injection port and is configured to inject lubricating fluid into the second sealed chamber through the second injection port. The second output pipe 72 is connected to the second output port and is configured to discharge the lubricating fluid from the second sealed chamber through the second output port. The lubricating fluid serves a lubricating function, preventing dry friction between the piston rod and the cylinder neck, and extending the service life of the compressor.

[0070] The lubricating fluid in the second sealed chamber 52 is constantly renewed. The lubricating fluid is continuously injected into the second sealed chamber 52 through the second inlet via the second inlet through the second inlet, and at the same time flows out of the second sealed chamber 52 through the second outlet via the second outlet through the second outlet via the second outlet pipe 72, so as to ensure the lubrication effect of the compressor in real time.

[0071] In some embodiments, such as Figure 1 and Figure 2 As shown, the inner wall of the cylinder neck 12 is provided with fifth annular grooves at intervals, and second sealing rings 32 are respectively disposed in the fifth annular grooves at intervals, and protrude from the inner wall of the cylinder neck radially toward the outer wall of the piston rod. That is to say, the second sealing rings 32 are disposed on the inner wall of the cylinder neck 12, and move relative to the outer wall of the piston rod 22 as the piston rod moves.

[0072] In other embodiments, the second sealing ring 32 may also be disposed on the piston rod. For example, a sixth annular groove is provided at intervals on the outer wall of the piston rod 22, and the second sealing rings are respectively disposed in the sixth annular grooves at intervals, and protrude from the outer wall of the piston rod toward the inner wall of the cylinder neck in the radial direction of the piston rod.

[0073] In other embodiments, a second support ring may also be provided in the second sealing chamber 52 in a manner similar to that in the first sealing chamber 51. The support ring may be provided on the outer side wall of the piston rod or the inner side wall of the cylinder neck to support and guide the piston rod, which will not be described again.

[0074] In some embodiments, such as Figure 1 and Figure 2 As shown, the spaced-apart second sealing rings 32 ensure the airtightness of the second sealing chamber 52, isolating the lubricant within it from the gas in the cylinder body 11. This ensures lubrication of the piston rod while preventing lubricant leakage into the cylinder, thus maintaining the purity of the gas in the cylinder. The pressure of the lubricant in the second sealing chamber 52 is greater than the gas pressure inside the cylinder body, preventing gas from the cylinder from entering the second sealing chamber 52 and ensuring effective lubrication between the piston rod 22 and the cylinder neck 12.

[0075] In some embodiments, such as Figure 1 and Figure 2As shown, the reciprocating compressor 100 further includes a second one-way valve 711, which is disposed on the second input line 71, ensuring that the lubricating fluid transmitted in the second input line 71 can only flow in one direction. This prevents the lubricating fluid injected into the second sealed chamber 52 via the second input line 71 from flowing back. To ensure that the lubricating fluid in the second sealed chamber 52 has sufficient pressure, the end of the second input line 42 away from the second injection port is connected to a lubricating fluid pump, which pumps the lubricating fluid into the second sealed chamber 52 at sufficient pressure. In some embodiments, the first input line 41 and the second input line 71 can be connected in parallel to the same lubricating fluid pump, using the same pump to simultaneously supply high-pressure lubricating fluid to both the first input line 41 and the second input line 71.

[0076] In some embodiments, such as Figure 1 and Figure 2 As shown, the second output line 72 can be connected to the first output line 42, so that the two share the same overflow valve 421, thereby avoiding excessive pressure of the lubricating fluid in the first sealed chamber 51 and the second sealed chamber 52.

[0077] Figure 3 This is a schematic diagram of the structure of a piston compressor provided in some embodiments of this disclosure. Figure 2 The illustrated embodiments and Figure 1 The structures of the two embodiments are basically the same, and the similarities will not be repeated here. The following mainly introduces the differences between the two.

[0078] like Figure 3 As shown, with Figure 1 The difference in the illustrated embodiment is that the first output pipe 42 corresponding to the first sealed chamber 51 and the second output pipe 72 corresponding to the second sealed chamber 52 are independent of each other. An additional overflow valve 721 is installed on the second output pipe 72 to ensure that the pressure of the lubricating fluid in the second sealed chamber 52 is greater than the gas pressure but not excessively high. If the pressure of the lubricating fluid in the second sealed chamber 52 is too high, it may leak into the cylinder body 11, contaminating the gas in the cylinder. When the pressure of the lubricating fluid in the second sealed chamber 52 reaches a second threshold, the lubricating fluid in the second sealed chamber 52 will overflow through the other overflow valve 721, ensuring the normal pressure of the lubricating fluid in the second sealed chamber 51. By independently setting the first output pipe 42 and the second output pipe 72, the pressure of the lubricating fluid in the first sealed chamber 51 and the second sealed chamber 52 can be differentiated according to specific circumstances.

[0079] In some embodiments, the first input pipeline 41 corresponding to the first sealed chamber 51 and the second input pipeline 71 corresponding to the second sealed chamber 52 can also be set independently, and different lubricating fluid pumps are used to supply lubricating fluid, so that the pressure of the lubricating fluid supplied to the first sealed chamber 51 and the second sealed chamber 52 is set differently.

[0080] Figure 4 This is a schematic diagram of the structure of a piston compressor provided in some embodiments of this disclosure. Figure 2 The illustrated embodiments and Figure 1 The structures of the two embodiments are basically the same, and the similarities will not be repeated here. The following mainly introduces the differences between the two.

[0081] like Figure 4 As shown, with Figure 1 The difference in the illustrated embodiment is that the lubricant circuits of the first sealed chamber 51 and the second sealed chamber 52 are connected in series. Specifically, the second input pipe 71 supplies lubricant to the second sealed chamber 52, and the second output pipe 72 corresponding to the second sealed chamber 52 is connected to the first input pipe 41 corresponding to the first sealed chamber 51. The lubricant output from the second sealed chamber 52 is supplied to the first sealed chamber 51 via the first input pipe 41. This method can reduce lubricant consumption.

[0082] In other embodiments, the connected lubricant circuit can also supply lubricant to the first sealed chamber 51 first, and then to the second sealed chamber 52, which will not be described again.

[0083] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0084] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A piston compressor, characterized in that, The reciprocating compressor includes: A cylinder body, wherein a first injection port and a first output port are provided on the side wall of the cylinder body; The piston is located in the cylinder body and reciprocates within the cylinder body. A pair of first sealing rings are spaced apart in the extending direction of the cylinder body. The spaced first sealing rings, the inner side wall of the cylinder body, and the outer side wall of the piston form a first sealing chamber. The first sealing chamber isolates the lubricant inside from the gas inside the cylinder body. A first input line is connected to the first injection port and configured to inject lubricant into the first sealed chamber through the first injection port; A first output conduit, connected to the first output port, is configured to discharge lubricating fluid from the first sealed chamber through the first output port. A first support ring, disposed between spaced-apart first sealing rings and immersed in the lubricant, is configured to bear the weight of the piston and maintain the gap between the inner wall of the cylinder body and the outer wall of the piston in the first sealed chamber. The surface of the first support ring facing the inner wall of the cylinder body or the surface facing the outer wall of the piston has grooves that allow the lubricant inside the first sealed chamber to flow freely. The reciprocating compressor also includes: The cylinder neck is connected to the cylinder body, and the side wall of the cylinder neck has a second injection port and a second output port. A piston rod is inserted through the cylinder neck, and one end of the piston rod is fixedly connected to the piston. A pair of second sealing rings are spaced apart in the extending direction of the cylinder neck. The spaced second sealing rings, the inner sidewall of the cylinder neck, and the outer sidewall of the piston rod form a second sealing chamber. The second sealing chamber isolates the lubricant inside from the gas inside the cylinder body. The second input line is connected to the second injection port and is configured to inject lubricating fluid into the second sealed chamber through the second injection port; A second output pipe, connected to the second output port, is configured to discharge the lubricating fluid from the second sealed chamber through the second output port. The second output pipe is connected to the first input pipe to supply the lubricating fluid output from the second sealed chamber to the first sealed chamber via the first input pipe.

2. The reciprocating compressor according to claim 1, wherein, The piston outer sidewall is provided with a first annular groove and a second annular groove located between the spaced first annular grooves. The spaced first sealing rings are respectively disposed in the spaced first annular grooves and protrude from the piston outer sidewall toward the inner sidewall of the cylinder body in the radial direction of the piston. The first support ring is disposed in the second annular groove and protrudes from the piston outer sidewall toward the inner sidewall of the cylinder body in the radial direction of the piston.

3. The reciprocating compressor according to claim 1, wherein, The inner wall of the cylinder body is provided with a third annular groove and a fourth annular groove located between the spaced third annular grooves. The spaced first sealing rings are respectively disposed in the spaced third annular grooves and protrude from the inner wall of the cylinder body toward the outer wall of the piston in the radial direction of the cylinder body. The first support ring is disposed in the fourth annular groove and protrudes from the inner wall of the cylinder body toward the outer wall of the piston in the radial direction of the cylinder body.

4. The reciprocating compressor according to any one of claims 1 to 3, wherein, The pressure of the lubricant in the first sealed chamber is greater than the gas pressure inside the cylinder body to prevent gas from the cylinder body from entering the first sealed chamber.

5. The reciprocating compressor according to any one of claims 1 to 3, wherein, The reciprocating compressor also includes: A first check valve is disposed on the first input pipeline; and An overflow valve is installed on the first output pipeline.

6. The reciprocating compressor according to claim 1, wherein, The cylinder neck has a fifth annular groove spaced apart on its inner sidewall. Second sealing rings are spaced apart and respectively disposed in the fifth annular grooves. The second sealing rings protrude from the inner sidewall of the cylinder neck radially toward the outer sidewall of the piston rod.

7. The reciprocating compressor according to claim 1, wherein, The piston rod has a sixth annular groove spaced apart on its outer sidewall. Second sealing rings are spaced apart and respectively disposed in the sixth annular grooves. The second sealing rings protrude from the outer sidewall of the piston rod radially toward the inner sidewall of the cylinder neck.

8. The reciprocating compressor according to any one of claims 1, 6 to 7, wherein, The pressure of the lubricant in the second sealed chamber is greater than the gas pressure inside the cylinder body, to prevent gas from the cylinder body from entering the second sealed chamber. The reciprocating compressor further includes: a second one-way valve disposed on the second input pipeline; and another relief valve disposed on the second output pipeline.

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