A leak-proof refrigerant pump

Abstract

The present invention discloses a leak-proof refrigerant pump, which relates to the technical field of gear pumps and includes a control gear set. The control gear set is drivingly connected to a drive shaft. The drive shaft penetrates through a housing and is drivingly connected to the housing. The housing is composed of a front end cover, a pump body, and a rear end cover that are tightly connected. The drive shaft penetrates through the rear end cover, and a shaft seal is provided between the drive shaft and the rear end cover. The shaft seal is composed of a first shaft seal, a second shaft seal, and a third shaft seal. By adopting the multi-layer shaft seal design of the first shaft seal, the second shaft seal, and the third shaft seal in the present invention, not only the redundancy of the seal is improved, but also different working conditions can be adapted to ensure good sealing performance even in harsh environments. At the same time, as a supplement to the first shaft seal, the second shaft seal can still provide the necessary sealing effect when the first shaft seal is worn or fails, further enhancing the sealing performance of the shaft seal.

Description

Technical Field

[0001] The present invention relates to the technical field of gear pumps, and particularly to a refrigerant pump with leakage prevention. Background Art

[0002] Refrigerant pumps are mainly used in air conditioning systems or refrigeration equipment to increase the pressure of the refrigerant so that it can circulate in the system. Refrigerant pumps can be different types of pumps, including but not limited to centrifugal pumps, piston pumps, etc.; in some specific refrigeration system designs, gear pumps are used as refrigerant pumps.

[0003] A gear pump is a positive displacement pump that realizes the suction and discharge of liquid by the rotation of two meshing gears. This type of pump is usually used to transport viscous media such as oils and lubricants and is widely used in industries such as chemical engineering and petroleum. Gear pumps can also be used to transport refrigerants, especially in cases where high-precision control or handling of high pressure differences is required.

[0004] Chinese Patent with the authorization announcement number CN106194721B discloses a gear pump, which includes a driving gear, a rotating shaft, a pump oil driving gear, a pump oil driven gear, and a pump body provided with a lubricating cavity and a gear cavity. The pump oil driving gear and the pump oil driven gear are both rotatably arranged in the gear cavity and are meshed with each other. The driving gear is arranged in the lubricating cavity and is connected to the pump oil driving gear through the rotating shaft. It also includes an oil seal skeleton and a drain pipe. The two oil seal skeletons are sleeved on the rotating shaft, and an oil collecting cavity is formed between the two oil seal skeletons. The pump body is provided with an oil drain hole, which is communicated with the oil collecting cavity. One end of the drain pipe is connected to the oil drain hole, and the other end is connected to the oil suction port on the pump body. If oil leakage occurs in the gear cavity, the leaked oil will first pass through the oil drain hole and be discharged into the oil suction port for recycling. If the leaked oil is more and overflows the oil seal skeleton, the oil that overflows the oil seal skeleton will pass through the oil drain hole and be discharged through the drain pipe and enter the oil suction port for recycling. The combined action of the oil drain hole, the oil drain hole, and the oil seal skeleton effectively prevents the oil in the gear cavity from entering the lubricating cavity, and the oil leaked from the gear cavity can be recycled and will not pollute the environment. The beneficial effects thus produced are: the structure of the present invention is simple, the sealing effect is good, the pollution is small, and the oil utilization rate is high.

[0005] In the field of data centers or communication machine rooms, more and more various types of refrigerant pumps are being used; refrigerant leakage is one of the common problems in the transportation process of gear pumps; due to the structural characteristics of gear pumps, the seals are prone to wear or aging, resulting in refrigerant leakage; leakage will not only affect the efficiency of the refrigeration system but may also cause environmental pollution.

[0006] Therefore, the present invention proposes a refrigerant pump with leakage prevention to solve the above problems. Summary of the Invention

[0007] In view of the problems existing in the above-mentioned prior art, the present invention is proposed.

[0008] To solve the above technical problems, the present invention provides the following technical solution: A leak-proof refrigerant pump, including a gear pump body, the gear pump body is provided with an installation cavity, the installation cavity is provided with a control gear set, the control gear set is drivingly connected with a transmission shaft, the transmission shaft penetrates through a housing and forms a driving connection with the housing, the housing is composed of a front end cover, a pump body and a rear end cover which are tightly connected, the transmission shaft penetrates through the rear end cover, and a oil seal is provided between the transmission shaft and the rear end cover, the oil seal is composed of a first oil seal, a second oil seal and a third oil seal, the first oil seal and the second oil seal both rotate around the central axis of the transmission shaft, the third oil seal is relatively stationary with the rear end cover, and a high-pressure layer is formed between the second oil seal and the third oil seal;

[0009] Wherein, a force transmission partition plate extends from the rear end of the first oil seal and is inserted into the second oil seal to form an oil storage cavity, and an oil sealing cavity is formed between the force transmission partition plate and the second oil seal.

[0010] As a preferred scheme of the leak-proof refrigerant pump of the present invention, wherein: the first oil seal is arranged in an inverted Z shape, and a stop strip is pressed on the lip surface of one end facing the control gear set, and the stop strip is integrally connected with the rear end cover.

[0011] As a preferred scheme of the leak-proof refrigerant pump of the present invention, wherein: the first oil seal includes a lip portion, a force transmission portion and a sealing portion, an inner portion of the first oil seal is provided with a hoop, a first telescopic portion and a second telescopic portion, the hoop includes an annular hoop and an L-shaped hoop, the first telescopic portion transmits force through telescoping to the annular hoop, and the second telescopic portion transmits force through telescoping to the L-shaped hoop.

[0012] As a preferred scheme of the leak-proof refrigerant pump of the present invention, wherein: the material of the first oil seal is selected as nitrile rubber, the first telescopic portion and the second telescopic portion are both made of nickel alloy material, and the hoop is made of carbon fiber material.

[0013] As a preferred scheme of the leak-proof refrigerant pump of the present invention, wherein: the force transmission partition plate includes two groups of parallel force transmission single lower plates, force transmission single upper plates and connecting plates, wherein the force transmission single lower plates, the force transmission single upper plates, the connecting plates and the force transmission portion are integrally connected, and the force transmission single lower plates are vertically inserted into the second oil seal.

[0014] As a preferred scheme of the leak-proof refrigerant pump of the present invention, wherein: the second oil seal is composed of a triangular portion and a rectangular portion, a group of triangular ring circles are arranged inside the triangular portion of the second oil seal, and the triangular ring circles are made of carbon fiber material.

[0015] As a preferred embodiment of the leak-proof refrigerant pump of the present invention, wherein: a semi-circular ring groove is provided in the rectangular portion of the second oil seal, the semi-circular ring groove protrudes obliquely upward, and the central diameter line passing through the semi-circular ring groove is perpendicular to the lower plate of the force transmission unit.

[0016] As a preferred embodiment of the leak-proof refrigerant pump of the present invention, wherein: a baffle plate is provided above the semi-circular ring groove of the second oil seal, and the baffle plate is perpendicular to the lower plate of the force transmission unit.

[0017] As a preferred embodiment of the leak-proof refrigerant pump of the present invention, wherein: a plurality of oil passing holes are provided on the surface of the lower plate of the force transmission unit, the plurality of oil passing holes are in the shape of conical holes, and the oil passing holes are obliquely arranged inside the lower plate of the force transmission unit.

[0018] As a preferred embodiment of the leak-proof refrigerant pump of the present invention, wherein: a pressure pump is provided at the top end of the rear end cover, a gas guide pipe is connected to the air outlet of the pressure pump, and the gas guide pipe is used to convey the pressure pump between the second oil seal and the third oil seal.

[0019] The beneficial effects of the present invention: Through the multi-level oil seal design of the first oil seal, the second oil seal and the third oil seal adopted in the present invention, not only the redundancy of the seal is improved, but also different working conditions can be adapted to ensure good sealing performance even in harsh environments; at the same time, the selection of carbon fiber and nickel alloy materials realizes the automatic adjustment ability of the oil seal during high-speed rotation and temperature change; secondly, as a supplement to the first oil seal, the second oil seal can still provide the necessary sealing effect in the case of wear or failure of the first oil seal, further enhancing the sealing performance of the oil seal; the third oil seal can effectively prevent external dust and impurities from entering the refrigerant pump, ensure the cleanliness inside the pump body, and improve the long-term operation stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the refrigerant pump in the present invention;

[0022] Figure 2 It is a cross-sectional view of the overall structure of the refrigerant pump in the present invention;

[0023] Figure 3 In the present invention Figure 2Enlarged view of the structure of part A;

[0024] Figure 4 Schematic diagram of the partial structure of the first oil seal in the present invention;

[0025] Figure 5 Schematic diagram of the overall structure of the first oil seal in the present invention;

[0026] Figure 6 For the present invention Figure 2 Enlarged view of the structure of part B;

[0027] Figure 7 Cross-sectional view of the overall structure of the first oil seal in the present invention;

[0028] Figure 8 Schematic diagram of the partial structure of the second oil seal of the present invention.

[0029] Reference numerals in the drawings are: 1, gear pump body; 11, control gear set; 12, transmission shaft; 2, housing; 21, front end cover; 22, pump body; 23, rear end cover; 24, flange; 3, oil seal; 31, first oil seal; 311, lip portion; 312, force transmission portion; 313, sealing portion; 314, hoop; 315, first telescopic portion; 316, second telescopic portion; 32, second oil seal; 321, triangular portion; 322, rectangular portion; 323, semi-circular ring groove; 324, baffle plate; 325, triangular ring; 33, third oil seal; 34, force transmission partition; 341, upper force transmission single plate; 342, connecting plate; 343, lower force transmission single plate; 344, oil passage hole; 4, pressure pump; 41, air duct; 42, pressure sensing element; 5, retaining strip. Detailed implementation manners

[0030] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings of the specification.

[0031] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that may be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other from other embodiments.

[0033] The process of transporting refrigerant using a gear pump is as follows:

[0034] When the gear pump is started, the two gears begin to rotate, the driving gear is driven by the motor to rotate, and the moving gear meshes with the driving gear and rotates with it.

[0035] A low-pressure area is formed at the separation point of the two gears, which creates a suction effect at the suction port of the pump. The refrigerant is sucked into the pump from the low-temperature and low-pressure side of the system. As the gears rotate, they trap the refrigerant in the closed space between the gears and the pump housing, forming a moving sealed chamber. This sealed chamber moves forward as the gears rotate, and the refrigerant in the sealed chamber is pushed forward as the gears rotate, moving from the suction port to the discharge port. In this process, the refrigerant does not come into direct contact with the gears, but is transmitted through the gap between the gears and the pump housing. When the sealed chamber approaches the discharge port, the two gears gradually approach, causing the chamber volume to decrease, thereby increasing the pressure of the refrigerant. The refrigerant is discharged from the discharge port under high pressure and enters the high-temperature and high-pressure side of the system. After the refrigerant is discharged, the gears continue to rotate and repeat the above process, continuously sucking in new refrigerant and delivering it to the other side of the system.

[0036] In this process, the structural characteristics of the gear pump determine that its internal seals are used to prevent refrigerant leakage. As the gear pump runs for a long time, the seals are prone to wear or aging, which can cause refrigerant leakage.

[0037] Refrigerant leakage not only reduces the efficiency of the refrigeration system, but also poses a potential risk of environmental pollution. In environments such as data centers or communication rooms, it is crucial to keep the refrigeration system running efficiently and stably.

[0038] Embodiment 1

[0039] Reference Figures 1 to 4 As shown, it is the first embodiment of the present invention, which provides a leak-proof refrigerant pump, including a gear pump body 1, the gear pump body 1 is provided with an installation cavity, the installation cavity is provided with a control gear set 11, the control gear set 11 is transmission-connected with a transmission shaft 12, the control gear set 11 includes a driving gear and a driven gear, the driving gear is transmission-connected with a transmission shaft 12, the driven gear is transmission-connected with a rotating shaft, the transmission shaft 12 penetrates a housing 2 and forms a transmission connection arrangement with the housing 2, the rotating shaft does not penetrate the housing 2, the driven gear is driven to rotate by the driving gear, and is connected to the driven gear The rotating shaft connected as one forms a transmission connection with the housing 2. The housing 2 is composed of a front cover 21, a pump body 22 and a rear cover 23 which are tightly connected. A flange 24 is installed on the rear cover 23. The front cover 21, the pump body 22, the rear cover 23 and the flange 24 are tightly connected as one by bolts. The transmission shaft 12 passes through the rear cover 23. An oil seal 3 is provided between the transmission shaft 12 and the rear cover 23. The oil seal 3 is composed of a first oil seal 31, a second oil seal 32 and a third oil seal 33. The first oil seal 31 rotates with the center line of the transmission shaft 12 as the axis.

[0040] Among them, the first oil seal 31 is used to seal the opening of the installation cavity facing the flange 24 and serves as the first seal inside the refrigerant pump. The first oil seal 31 is arranged in an inverted Z shape. A retaining strip 5 is pressed on the lip surface of one end facing the control gear set 11. The retaining strip 5 is integrally connected to the rear end cover 23. Inside the first oil seal 31, there are a hoop 314, a first telescopic part 315, and a second telescopic part 316. The retaining strip 5 is made of high-strength carbon fiber material, which is used to change the flow direction of the liquid, changing the leakage from the connection between the retaining strip 5 and the rear end cover 23 to the connection between the retaining strip 5 and the first oil seal 31. The first oil seal 31 includes a lip part 311, a force transmission part 312, and a sealing part 313. The lip part 311 is used to block the gap between the retaining strip 5 and the transmission shaft 12, and the hoop 314 is used to further reinforce the stability of the lip part 311 of the first oil seal 31, ensuring a tight connection between the first oil seal 31 and the outer wall of the transmission shaft 12. Among them, the hoop 314 is made of carbon fiber material. When the transmission shaft 12 is rotating at a high speed, the first oil seal 31 wrapped around the surface of the transmission shaft 12 rotates and generates a strong centrifugal force. The strong centrifugal force causes the lip part 311 to expand outward, resulting in oil leakage. The hoop 314 fastens the lip part 311, making the lip part 311 of the first oil seal 31 still difficult to deform during high-speed rotation;

[0041] Secondly, when the transmission shaft 12 is rotating at a high speed, phenomena such as the friction between the driving gear and the driven gear, the friction between the driving gear, the driven gear and the housing 2, and the friction between the transmission shaft 12 and the housing 2 will cause the temperature in the installation cavity to rise sharply. Carbon fiber is not only a material with high strength but also a material that is not easily affected by temperature changes, having good high-temperature and cold resistance. Due to the high strength and high-temperature resistance of carbon fiber, the hoop 314 tightly presses on the lip part 311, ensuring the shape of the lip part 311 and the tight connection between the lip part 311 and the transmission shaft 12;

[0042] Secondly, in order to further prevent leakage at the connection between the lip part 311 and the transmission shaft 12;

[0043] Among them, the hoop 314 is composed of an annular hoop and an L-shaped hoop. The annular hoop is located inside the lip part 311. The first telescopic part 315 expands when heated, and transmits the force exerted on the rear end cover 23 by the expansion of the first telescopic part 315 in the reverse direction to the first telescopic part 315 and then presses on the annular hoop, further ensuring the stability of the lip part 311 of the first oil seal 31 and the tight connection between the lip part 311 of the first oil seal 31 and the transmission shaft 12.

[0044] The L-shaped hoop is located at the bottom end of the force transmission part 312, the second telescopic part 316 and the first telescopic part 315 are made of the same material, and the cross-sectional shape of the second telescopic part 316 is set in a ladder shape to increase the width of the second telescopic part 316. After being heated, the second telescopic part 316 expands in both the horizontal and longitudinal directions. The longitudinal expansion enables the second telescopic part 316 to transmit the force of the inner wall of the rear end cover 23 to the L-shaped hoop, that is, the first telescopic part 315 transmits force to the annular hoop through telescoping, and the second telescopic part 316 transmits force to the L-shaped hoop through telescoping, so that the connection between the first oil seal 31 and the transmission shaft 12 is uniformly stressed and both are in a tightly connected state. At the same time, the reaction force generated by the expansion of the second telescopic part 316 against the transmission shaft 12 and the L-shaped hoop makes the second telescopic part 316 and the rear end cover 23 form a tight connection, that is, there is an oil seal 3 to form a strong seal between the rear end cover 23 and the transmission shaft 12;

[0045] The first telescopic part 315 and the second telescopic part 316 are both made of nickel alloy, and the hoop 314 is made of carbon fiber. The first telescopic part 315 and the second telescopic part 316 are both made of nickel alloy, which is a high-temperature alloy material with excellent high-temperature expansion performance and high strength. It expands and deforms under high temperature conditions, forming a force transmission structure with the rear end cover 23, and extruding the hoop 314 in the reverse direction, so that the hoop 314 is further stabilized. The first telescopic part 315 and the second telescopic part 316 are deformed by the rotation of the transmission shaft 12 and the change of temperature, so as to achieve the effect of adaptive leakage prevention of the refrigerant pump.

[0046] In summary, the present invention adopts a multi-level oil seal design of the first oil seal 31, the second oil seal 32 and the third oil seal 33, which not only improves the redundancy of the seal, but also can adapt to different working conditions to ensure that a good sealing effect can be maintained even in harsh environments; wherein, the built-in hoop 314, the first telescopic portion 315 and the second telescopic portion 316 of the first oil seal 31, through the selection of carbon fiber and nickel alloy materials, realize the automatic adjustment ability of the oil seal during high-speed rotation and temperature changes; the hoop 314 made of carbon fiber has high strength and good temperature resistance, can effectively resist the influence of centrifugal force, and maintain the shape and stability of the lip portion 311, while the first telescopic portion 315 and the second telescopic portion 316 of the nickel alloy use their excellent high-temperature expansion performance to form an effective force transmission structure with the rear end cover 23, ensuring close contact between the oil seal and the drive shaft 12, and can automatically adjust even when the temperature rises to prevent refrigerant leakage.

[0047] Secondly, the first oil seal 31 is designed in an inverted Z shape, and its lip part 311 is tightly connected to the transmission shaft 12 through a retaining hoop 314. The retaining hoop 314 is composed of an annular hoop and an L-shaped hoop. Combining the expansion characteristics of the first expansion part 315 and the second expansion part 316, it ensures that the connection between the oil seal and the transmission shaft 12 always maintains close contact, and can maintain the sealing effect even under high-speed rotation and temperature changes.

[0048] At the same time, a retaining strip 5 is added at the lip part 311 of the first oil seal 31, which changes the flow direction of the liquid, avoids the leakage of the liquid from the connection between the retaining strip 5 and the rear end cover 23, but instead changes to the connection between the retaining strip 5 and the first oil seal 31. This design further enhances the sealing performance of the oil seal.

[0049] Supplementary function of the second oil seal 32: As a supplement to the first oil seal 31, the second oil seal 32 is located between the first oil seal 31 and the third oil seal 33, increasing the sealing redundancy. Even when the first oil seal 31 is worn or fails, the second oil seal 32 can still provide the necessary sealing effect.

[0050] Dust-proof and redundancy functions of the third oil seal 33: The third oil seal 33 not only increases the sealing redundancy, but also can effectively prevent external dust and impurities from entering the refrigerant pump, ensuring the cleanliness inside the pump body 22, and improving the long-term operation stability and reliability of the system.

[0051] Embodiment 2

[0052] Refer to Figures 4 to 8As shown in the figure, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment. The difference is that both the first oil seal 31 and the second oil seal 32 rotate around the center line of the transmission shaft 12, and the first oil seal 31 and the second oil seal 32 are relatively stationary. Among them, a force - transmitting partition plate 34 extends from the rear end of the first oil seal 31. The force - transmitting partition plate 34 includes two groups of parallel force - transmitting single lower plates 343, force - transmitting single upper plates 341, and connecting plates 342. And the force - transmitting single lower plates 343, force - transmitting single upper plates 341, connecting plates 342, and force - transmitting parts 312 are integrally connected. The force - transmitting single lower plate 343 is vertically inserted into the second oil seal 32. The force - transmitting single upper plate 341 and the force - transmitting single lower plate 343 are made of nickel alloy. By using their excellent high - temperature expansion performance, the radial lengths of the force - transmitting single upper plate 341 and the force - transmitting single lower plate 343 expand and elongate at high temperatures. One end of the force - transmitting single lower plate 343 abuts against the second oil seal 32. The force - transmitting single lower plate 343 receives the force transmitted by the second oil seal 32 and generates a reaction force. Part of this reaction force is directly transmitted to the first oil seal 31. After the first oil seal 31 is stressed, the connection between the first oil seal 31 and the rear end cover 23 becomes tighter. At this time, more of the reaction force acting on the rear end cover 23 is along the axis direction of the transmission shaft 12. The other part of this reaction force is transmitted to the force - transmitting single upper plate 341 through the connecting plate 342. The force - transmitting single upper plate 341 presses the first oil seal 31. At this time, more of the reaction force acting on the rear end cover 23 is perpendicular to the axis direction of the transmission shaft 12. The first oil seal 31 reinforces itself by means of the reverse action of the second oil seal 32.

[0053] In summary, the second embodiment of the present invention has been innovatively upgraded on the basis of the original self - adaptive leak - proof refrigerant pump. By adding a force - transmitting partition plate 34 at the rear end of the first oil seal 31, this partition plate includes a force - transmitting single lower plate 343, a force - transmitting single upper plate 341, and a connecting plate 342, and is integrally connected. At high temperatures, the force - transmitting single upper plate 341 and the force - transmitting single lower plate 343 radially expand and elongate, generating a reaction force. Part of the force strengthens the connection tightness between the first oil seal 31 and the rear end cover 23 along the axis direction of the transmission shaft 12, and the other part of the force is transmitted to the force - transmitting single upper plate 341 through the connecting plate 342, pressing the first oil seal 31 perpendicular to the axis direction, enhancing the sealing effect. This design enables the first oil seal 31 to form self - reinforcement by means of the reverse force of the second oil seal 32, significantly improving the stability and reliability of the oil seal system. Especially in high - temperature and high - speed rotation working environments, it effectively prevents the leakage of refrigerant and improves the operation efficiency and safety of the refrigerant pump.

[0054] Embodiment Three

[0055] Refer to Figures 4 to 8As shown in the figure, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment. The difference is that a storage oil cavity is formed by the gap between the lower force transmission plate 343, the first oil seal 31 and the second oil seal 32. An oil sealing cavity is formed between the lower force transmission plate 343, the first oil seal 31 and the second oil seal 32. The lower force transmission plate 343 is arranged at an angle of 45° with the central axis of the transmission shaft 12. If the first oil seal 31 is worn, part of the liquid enters the storage oil cavity through the gap between the first oil seal 31 and the transmission shaft 12. Under the high-speed rotation of the transmission shaft 12, the liquid on the surface of the transmission shaft 12 is splashed out under the action of centrifugal force, and its splashing direction is the vertical direction of the shaft sleeve. The splashed liquid is blocked by the lower force transmission plate 343 and then deflected, and is retained inside the storage oil cavity, realizing another block on the liquid leakage path;

[0056] If the first oil seal 31 is severely worn, the liquid inside the storage oil cavity will gradually accumulate until the storage oil cavity is full. At this time, too much liquid enters the inside of the oil sealing cavity from the storage oil cavity;

[0057] A plurality of oil through holes 344 are provided on the surface of the lower force transmission plate 343. The plurality of oil through holes 344 are arranged as tapered holes. The design of the tapered holes is to make it easy for the liquid to go out and difficult to enter, increasing the difficulty of the liquid entering the oil sealing cavity from the storage oil cavity. At the same time, the oil through holes 344 are obliquely arranged inside the lower force transmission plate 343 to avoid the splashed liquid entering the oil through holes 344. The axis of the aperture of the oil through holes 344 is perpendicular to the liquid splashing direction;

[0058] The second oil seal 32 is composed of a triangular part 321 and a rectangular part 322. A baffle plate 324 is provided above the second oil seal 32 in the semi-circular ring groove 323. The baffle plate 324 is perpendicular to the lower force transmission plate 343. The second oil seal 32 is provided with a semi-circular ring groove 323 in the rectangular part 322. The liquid entering the oil sealing cavity will move upward along the track of the semi-circular ring groove 323 under the action of centrifugal force. The semi-circular ring groove 323 bulges obliquely upward to form a volume cavity for storing liquid due to oil sealing. The reason is that both the first oil seal 31 and the second oil seal 32 rely on the transmission of the transmission shaft 12. The second oil seal 32 is wrapped inside the first oil seal 31 and is relatively stationary, and there is no wear state;

[0059] Among them, the central diameter line passing through the semi-circular ring groove 323 is perpendicular to the lower force transmission plate 343. The liquid splashed on the surface of the connecting plate 342 and the liquid rotating in the semi-circular ring groove 323 are both deflected by the baffle plate 324 and deflected into the oil sealing cavity. In order to ensure the sealing performance between the second oil seal 32 and the transmission shaft 12, a group of triangular ring gaskets 325 are arranged inside the triangular part 321 of the second oil seal 32. The triangular ring gaskets 325 are made of carbon fiber material, and the high strength of carbon fiber is used to ensure the tight connection between the front end of the second oil seal 32 and the transmission shaft 12.

[0060] In summary, the oil storage cavity is designed as the first line of defense to capture the leaked oil fluid generated due to the wear of the first oil seal 31. When the oil storage cavity is full, the excess oil fluid will be directed to the oil sealing cavity, which serves as the second line of defense to further slow down the leakage of the oil fluid. Among them, the conical hole design of the oil passage hole 344 ensures that the oil fluid can easily drain from the oil sealing cavity, but it is difficult for the oil fluid to enter the oil sealing cavity from the oil storage cavity. This effectively controls the direction of the oil fluid flow, reduces unnecessary leakage. At the same time, the oil passage hole 344 is inclined, and the axis of the aperture of the oil passage hole 344 is perpendicular to the liquid splash direction, which can prevent the liquid splashed during high-speed rotation from directly entering the hole, reducing oil fluid loss. At the same time, the addition of the baffle plate 324, which is perpendicular to the lower plate 343 of the force transmission unit, can change the flow direction of the oil fluid, prevent the range of the oil fluid impact from being large, and at the same time help the oil fluid to be better distributed and circulated. The design of the semi-circular groove 323 allows the oil fluid entering the oil sealing cavity to move along a specific path under the action of centrifugal force and is finally guided to a volume cavity for accumulating liquid. Here, it can be designed to enable the liquid to flow back to the oil storage cavity in the shutdown state, realizing the reset function of the liquid and ensuring that the oil fluid will not overflow disorderly.

[0061] By adding a dual protection mechanism of the oil storage cavity and the oil sealing cavity, as well as the optimized design of the oil passage hole 344 and the second oil seal 32, the sealing performance and oil fluid management ability of the entire system are improved. This design is particularly suitable for mechanical equipment that needs to operate for a long time and work in harsh environments, such as industrial equipment, automobile engines, etc., which can effectively extend the service life of the oil seal, reduce maintenance costs and downtime.

[0062] Embodiment 4

[0063] Refer to Figure 2 、 Figure 3As shown, this is the third embodiment of the present invention. This embodiment is based on the previous embodiment. The difference is that the third oil seal 33 is relatively stationary with respect to the rear end cover 23, and a high-pressure layer is formed between the second oil seal 32 and the third oil seal 33. A pressure pump 4 is provided at the top of the rear end cover 23. The pressure pump 4 generates a certain pressure through compressed air or other inert gases. A gas guide pipe 41 is connected to the air outlet of the pressure pump 4. The gas guide pipe 41 is used to convey the pressure pump 4 between the second oil seal 32 and the third oil seal 33, for establishing a high-pressure layer between the second oil seal 32 and the third oil seal 33. And a pressure sensing element 42 is assumed between the second oil seal 32 and the third oil seal 33. The pressure sensing element 42 is used to continuously monitor the gas pressure in the high-pressure layer to ensure that the pressure is maintained at a stable level. A microprocessor and a temperature sensor are also equipped; the microprocessor is responsible for receiving data from the pressure sensor and calculating according to a preset algorithm whether it is necessary to start or adjust the output of the pressure pump 4 to maintain the pressure of the high-pressure layer. Temperature sensor: The temperature sensor detects the temperature inside the pump body 22 and is used to adjust the working parameters of the pressure pump 4 to ensure that the formation of the high-pressure layer is still effective under different temperature conditions;

[0064] Specifically, when the refrigerant pump is started, the microprocessor starts the pressure pump 4 according to a preset program, and starts to inflate the area between the second oil seal 32 and the third oil seal 33 to form a high-pressure layer. Among them, the preset program includes a start program, a pressure control program, a temperature compensation program, and an exception handling program.

[0065] Preset program: When the refrigerant pump is started, the preset program will execute in the set step sequence. For example, first start the pressure pump 4, and then gradually establish the high-pressure layer between the second oil seal 32 and the third oil seal 33 to ensure that the system can maintain the required sealing state at the initial stage of startup;

[0066] Pressure control program: This is the core part of the preset program and involves the output control of the pressure pump 4. By using a PID controller or a fuzzy logic control algorithm, the microprocessor can adjust the output of the pressure pump 4 according to the real-time monitored pressure data to ensure that the pressure of the high-pressure layer is always maintained within the set range. The preset program contains specific control logics, such as increasing the output when the pressure is lower than a certain threshold and decreasing the output when it is higher than the threshold. The setting of the threshold is set by those skilled in the art according to historical records.

[0067] Temperature compensation program: Considering the influence of the temperature change inside the pump body 22 on the formation of the high-pressure layer, the preset program also includes a temperature compensation algorithm. When the temperature sensor detects a temperature change, the preset program will automatically adjust the target pressure value to keep the effectiveness of the high-pressure layer unaffected by temperature fluctuations. Output of the pressure pump 4

[0068] Exception Handler: The preset program also includes exception handling logic. For example, when the pressure sensor detects abnormal pressure in the high-pressure layer, the system can automatically take measures, such as increasing or decreasing, to restore the normal pressure level in the high-pressure layer. In addition, if the pressure is too high or too low and reaches a dangerous threshold, the preset program may also trigger an alarm or automatic shutdown to prevent damage to the oil seal or the system.

[0069] Specifically, the pressure pump 4 delivers high-pressure gas to the high-pressure layer through the air duct 41, quickly establishing an atmospheric pressure higher than the external environment. During the operation of the pump, the pressure sensor continuously monitors the pressure in the high-pressure layer and transmits the data to the microprocessor. The microprocessor adjusts the output of the pressure pump 4 according to the real-time pressure data to ensure that the pressure in the high-pressure layer always remains within the set safety range. The data of the temperature sensor is also used to adjust the operating parameters of the pressure pump 4 to adapt to the change in the internal temperature of the pump body 22, ensuring that the effectiveness of the high-pressure layer is not affected by temperature.

[0070] Among them, when designing the preset algorithm for controlling the output of the pressure pump 4, the goal is to maintain the stable pressure of the high-pressure layer between the second oil seal 32 and the third oil seal 33, while considering the change in the internal temperature of the pump body 22. The preset algorithm usually includes a pressure control algorithm and a temperature compensation algorithm. The pressure control algorithm includes a PID controller and fuzzy logic control. The PID controller dynamically compensates by adjusting the output of the pressure pump 4 according to the deviation between the currently measured pressure value and the target pressure value.

[0071] The formula is:

[0072]

[0073] Among them, u(t) is the controller output, K p is the proportional gain, K i is the integral gain, K d is the derivative gain, is the difference between the pressure data monitored at time t and the preset pressure value, that is, the difference between the target pressure value and the actual pressure value, and T is the period of continuously monitoring the gas in the high-pressure layer.

[0074] In some cases, the PID controller may not be able to fully handle non-linear or uncertain system behaviors. The fuzzy logic control algorithm can more flexibly adapt to system changes by fuzzifying the input variables and using a fuzzy rule base to determine the output. Since the gas pressure is affected by temperature according to the ideal gas law PV=nRT, the algorithm needs to adjust the target pressure value according to the data of the internal temperature sensor of the pump body 22. For example, when the temperature rises, the target pressure should be appropriately reduced to avoid excessive pressure inside the high-pressure layer.

[0075] If the pressure sensor detects that the pressure in the high-pressure layer is lower than the preset value, the microprocessor will immediately increase the output of the pressure pump 4 to quickly restore the pressure in the high-pressure layer. Similarly, if the pressure is too high, the microprocessor will reduce the output of the pressure pump 4 to avoid overpressure on the oil seal, which may affect its service life and sealing effect.

[0076] Through the continuous high pressure in the high-pressure layer, an isolation layer is formed between the second oil seal 32 and the third oil seal 33 to provide triple sealing for the refrigerant pump. At the same time, when there is no leakage in the second oil seal 32, the pressure monitoring in the high-pressure layer is within a certain regular range. If a sudden change in the pressure value of the high-pressure layer is detected, the service conditions of the first oil seal 31 and the second oil seal 32 can be judged in reverse, and then replaced in real time to avoid more serious leakage.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A leakproof refrigerant pump, comprising a gear pump body (1), the gear pump body (1) being provided with an installation cavity, the installation cavity being provided with a control gear set (11), the control gear set (11) being drivingly connected to a transmission shaft (12), the transmission shaft (12) passing through a housing (2) and forming a driving connection with the housing (2), the housing (2) being composed of a front end cover (21), a pump body (22) and a rear end cover (23) which are tightly connected, characterized in that: The transmission shaft (12) passes through the rear end cover (23), and an oil seal (3) is provided between the transmission shaft (12) and the rear end cover (23), the oil seal (3) being composed of a first oil seal (31), a second oil seal (32) and a third oil seal (33), the first oil seal (31) and the second oil seal (32) both rotating with the center line of the transmission shaft (12) as an axis, the third oil seal (33) being relatively stationary with respect to the rear end cover (23), and forming a high pressure layer between the second oil seal (32) and the third oil seal (33); A force transmission partition plate (34) is extended from the rear end of the first oil seal (31) and is inserted into the second oil seal (32) to form an oil storage cavity. An oil sealing cavity is formed between the force transmission partition plate (34) and the second oil seal (32).

2. The leakproof refrigerant pump according to claim 1, characterized in that: The first oil seal (31) is arranged in an inverted Z-shape, and a retaining bar (5) is pressed on the lip surface of one end of the first oil seal facing the control gear set (11), and the retaining bar (5) is integrally connected to the rear end cover (23).

3. The leakproof refrigerant pump according to claim 2, characterized in that: The first oil seal (31) includes a lip portion (311), a force transmission portion (312) and a sealing portion (313). A hoop (314), a first telescopic portion (315) and a second telescopic portion (316) are provided inside the first oil seal (31). The hoop (314) includes an annular hoop and an L-shaped hoop. The first telescopic portion (315) transmits force to the annular hoop by telescoping, and the second telescopic portion (316) transmits force to the L-shaped hoop by telescoping.

4. The leakproof refrigerant pump according to claim 3, characterized in that: The material of the first oil seal (31) is nitrile rubber, the first telescopic portion (315) and the second telescopic portion (316) are both made of nickel alloy, and the hoop (314) is made of carbon fiber.

5. The leakproof refrigerant pump according to claim 4, characterized in that: The force transmission partition (34) comprises two sets of parallel force transmission single lower plates (343), force transmission single upper plates (341) and connecting plates (342), wherein the force transmission single lower plates (343), force transmission single upper plates (341), connecting plates (342) and force transmission portion (312) are connected in an integrated manner, and the force transmission single lower plates (343) are vertically inserted into the second oil seal (32).

6. The leakproof refrigerant pump according to claim 5, characterized in that: The second oil seal (32) is composed of a triangular portion (321) and a rectangular portion (322); the second oil seal (32) is located in the triangular portion (321) and has a set of triangular rings (325) built therein; the triangular rings (325) are made of carbon fiber material.

7. The leakproof refrigerant pump according to claim 6, characterized in that: The second oil seal (32) is provided with a semicircular annular groove (323) in the rectangular portion (322). The semicircular annular groove (323) protrudes obliquely upward, and a central diameter line passing through the semicircular annular groove (323) is perpendicular to the force transmission single lower plate (343).

8. The leakproof refrigerant pump according to claim 7, characterized in that: The second oil seal (32) is provided with a baffle (324) at the upper part of the semicircular annular groove (323), and the baffle (324) is perpendicular to the force transmission single lower plate (343).

9. The leakproof refrigerant pump according to claim 8, characterized in that: A plurality of oil holes (344) are provided on the surface of the force transmission single lower plate (343), the plurality of oil holes (344) are arranged in a conical shape, and the oil holes (344) are obliquely arranged inside the force transmission single lower plate (343).

10. The leakproof refrigerant pump according to claim 9, characterized in that: A pressure pump (4) is provided at the top end of the rear end cover (23), and an air guide pipe (41) is connected to the air outlet of the pressure pump (4). The air guide pipe (41) is used to transport the pressure pump (4) to between the second oil seal (32) and the third oil seal (33).

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