Leakage-proof refrigerant pump

Abstract

The invention relates to the technical field of gear pumps and discloses a leakproof refrigerant pump which comprises a control gear set, the control gear set is in transmission connection with a transmission shaft, the transmission shaft penetrates through a shell and is in transmission connection with the shell, the shell is composed of a front end cover, a pump body and a rear end cover which are tightly connected, and the transmission shaft penetrates through the rear end cover and is in transmission connection with the pump body. An oil seal is arranged between the transmission shaft and the rear end cover, the oil seal is composed of the first oil seal, the second oil seal and the third oil seal, the multi-layer oil seal design of the first oil seal, the second oil seal and the third oil seal is adopted, the sealing redundancy is improved, different working conditions can be adapted, and the service life of the transmission shaft is prolonged. A good sealing effect can be maintained even in a severe environment; and meanwhile, the second oil seal is used as a supplement of the first oil seal, so that the second oil seal can still provide a necessary sealing effect under the condition that the first oil seal is abraded or fails, and the sealing performance of the oil seal is further enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of gear pumps, in particular to a leak-proof refrigerant pump. 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 of different types, including but not limited to centrifugal pumps, plunger 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 uses two meshing gears to rotate to achieve the suction and discharge of liquids. This type of pump is usually used to transport viscous media, such as oils, lubricants, etc., and is widely used in the chemical, petroleum and other industries. Gear pumps can also be used to transport refrigerants, especially when high-precision control or high pressure differentials are required.

[0004] The Chinese patent with the authorization announcement number CN106194721B discloses a gear pump, including a transmission gear, a rotating shaft, an oil pumping driving gear, an oil pumping driven gear and a pump body provided with a lubrication chamber and a gear chamber, wherein the oil pumping driving gear and the oil pumping driven gear are both rotatably arranged in the gear chamber and the two are meshed with each other, the transmission gear is arranged in the lubrication chamber, and the transmission gear is connected to the oil pumping driving gear through the rotating shaft, and also includes an oil seal skeleton and an oil drain pipe, the two oil seal skeletons are sleeved on the rotating shaft, and an oil collecting chamber is formed between the two oil seal skeletons, an oil drain hole is provided on the pump body, the oil drain hole is connected to the oil collecting chamber, and one end of the oil drain pipe is connected to the oil drain The oil drain hole, the oil drain hole and the oil seal skeleton work together to effectively prevent the oil in the gear cavity from entering the lubrication cavity, and the oil leaked from the gear cavity can be recycled without polluting the environment. The beneficial effects produced thereby are: the present invention has a simple structure, good sealing effect, low pollution and high oil utilization rate.

[0005] In the field of data centers or communication rooms, more and more types of refrigerant pumps are used; refrigerant leakage is one of the common problems of gear pumps in the transportation process; due to the structural characteristics of gear pumps, 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 pollute the environment.

[0006] To this end, the present invention proposes a leak-proof refrigerant pump to solve the above-mentioned problem. Summary of the invention

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

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a leakproof refrigerant pump, comprising 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 connected to a transmission shaft in a transmission manner, the transmission shaft passes through a housing and forms a transmission connection with the housing, the housing is composed of a front end cover, a pump body and a rear end cover that are tightly connected, the transmission shaft passes through the rear end cover, and an 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 with the center line of the transmission shaft as the axis, the third oil seal is relatively stationary with respect to the rear end cover, and a high-pressure layer is formed between the second oil seal and the third oil seal;

[0009] A force transmission partition plate is extended 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 solution of the leak-proof refrigerant pump described in the present invention, the first oil seal is arranged in an inverted Z shape, and a baffle is pressed on the lip surface of one end facing the control gear group, and the baffle is integrally connected to the rear end cover.

[0011] As a preferred embodiment of the leak-proof refrigerant pump described in the present invention, the first oil seal includes a lip portion, a force transmission portion and a sealing portion, a hoop, a first telescopic portion and a second telescopic portion are provided inside the first oil seal, the hoop includes an annular hoop and an L-shaped hoop, the first telescopic portion transmits force to the annular hoop by telescoping, and the second telescopic portion transmits force to the L-shaped hoop by telescoping.

[0012] As a preferred solution of the leakproof refrigerant pump of the present invention, the first oil seal is made of nitrile rubber, the first telescopic part and the second telescopic part are both made of nickel alloy, and the hoop is made of carbon fiber.

[0013] As a preferred solution of the leak-proof refrigerant pump described in the present invention, the force transmission baffle includes two sets of parallel force transmission single lower plates, force transmission single upper plates and connecting plates, wherein the force transmission single lower plate, force transmission single upper plate, connecting plates and force transmission part are integrally connected, and the force transmission single lower plate is vertically inserted into the second oil seal.

[0014] As a preferred solution of the leak-proof refrigerant pump of the present invention, the second oil seal is composed of a triangular portion and a rectangular portion, the second oil seal is located in the triangular portion and has a group of triangular rings built therein, and the triangular rings are made of carbon fiber material.

[0015] As a preferred solution of the leak-proof refrigerant pump described in the present invention, the second oil seal is located in the rectangular portion and is provided with a semicircular groove, which protrudes obliquely upward, and the center diameter line passing through the semicircular groove is perpendicular to the force transmission single lower plate.

[0016] As a preferred solution of the leakproof refrigerant pump of the present invention, the second oil seal is provided with a baffle at the upper part of the semicircular ring groove, and the baffle is perpendicular to the force transmission single lower plate.

[0017] As a preferred solution of the leak-proof refrigerant pump described in the present invention, a plurality of oil holes are opened on the surface of the force transmission unit lower plate, the plurality of oil holes are arranged in a conical shape, and the oil holes are obliquely placed inside the force transmission unit lower plate.

[0018] As a preferred solution of the leak-proof refrigerant pump described in the present invention, a pressure pump is provided at the top of the rear end cover, and an air duct is connected to the air outlet of the pressure pump, and the air duct is used to transport the pressure pump to between the second oil seal and the third oil seal.

[0019] Beneficial effects of the present invention: the multi-level oil seal design of the first oil seal, the second oil seal and the third oil seal is adopted in the present invention, which not only improves the redundancy of the seal, but also can adapt to different working conditions, ensuring that a good sealing effect can be maintained even in harsh environments; at the same time, the selection of carbon fiber and nickel alloy materials realizes the automatic adjustment capability of the oil seal during high-speed rotation and temperature changes; secondly, the second oil seal is used as a supplement to the first oil seal. When the first oil seal is worn or fails, the second oil seal can still provide the necessary sealing effect, further enhancing the sealing performance of the oil seal; the third oil seal can effectively prevent external dust and impurities from entering the interior of the refrigerant pump, ensure the cleanliness of the inside of 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 accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[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 For the present invention Figure 2A magnified view of the structure of part A;

[0024] Figure 4 It is a schematic diagram of the partial structure of the first oil seal in the present invention;

[0025] Figure 5 It is a schematic diagram of the overall structure of the first oil seal in the present invention;

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

[0027] Figure 7 It is a cross-sectional view of the overall structure of the first oil seal in the present invention;

[0028] Figure 8 It is a schematic diagram of the partial structure of the second oil seal of the present invention.

[0029] The accompanying drawings are marked as follows: 1. gear pump body; 11. control gear set; 12. transmission shaft; 2. housing; 21. front cover; 22. pump body; 23. rear cover; 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. semicircular ring groove; 324. baffle; 325. triangular ring; 33. third oil seal; 34. force transmission partition; 341. force transmission single upper plate; 342. connecting plate; 343. force transmission single lower plate; 344. oil hole; 4. pressure pump; 41. air guide pipe; 42. pressure sensing element; 5. baffle. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] The process of using a gear pump to transport refrigerant 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 Figure 1 to Figure 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 toward the flange 24, as the first seal in the refrigerant pump, the first oil seal 31 is set in an inverted Z shape, and a baffle 5 is pressed on the lip surface of one end of the oil seal 31 facing the control gear set 11. The baffle 5 and the rear end cover 23 are connected in an integrated manner. The interior of the first oil seal 31 is provided with a hoop 314, a first telescopic portion 315 and a second telescopic portion 316. The baffle 5 is made of a high-strength carbon fiber material, which is used to change the flow direction of the liquid, and change the liquid from leaking from the connection between the baffle 5 and the rear end cover 23 to the connection between the baffle 5 and the first oil seal 31. The first oil seal 31 includes a lip portion 31 1. The force transmission part 312 and the sealing part 313, the lip part 311 is used to block the gap between the stop bar 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, so as to ensure the tight connection between the first oil seal 31 and the outer wall of the transmission shaft 12, wherein the hoop 314 is made of carbon fiber. When the transmission shaft 12 is in high-speed rotation, the first oil seal 31 wrapped on the surface of the transmission shaft 12 rotates to generate a strong centrifugal force. The strong centrifugal force causes the lip part 311 to expand outward, resulting in oil leakage. The hoop 314 tightens the lip part 311, so that the lip part 311 of the first oil seal 31 is still difficult to deform in high-speed rotation;

[0041] Secondly, when the transmission shaft 12 rotates at a high speed, the friction between the driving gear and the driven gear, the driving gear, the driven gear and the housing 2, and 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. It has good high temperature resistance and severe cold resistance. The high strength and high temperature resistance of carbon fiber make the hoop 314 tightly squeezed on the lip portion 311, ensuring the shape of the lip portion 311 and the tight connection between the lip portion 311 and the transmission shaft 12.

[0042] Secondly, in order to further prevent leakage from occurring at the connection between the lip portion 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 in the lip portion 311. The first telescopic portion 315 expands due to heat, and the force exerted on the rear end cover 23 by the expansion of the first telescopic portion 315 is transmitted in the opposite direction to the first telescopic portion 315 and then squeezed onto the annular hoop, thereby further ensuring the stability of the lip portion 311 of the first oil seal 31 and ensuring the tight connection between the lip portion 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 to be an inverted Z shape, and its lip portion 311 is kept tightly connected with the transmission shaft 12 through the hoop 314; the hoop 314 is composed of an annular hoop and an L-shaped hoop, combined with the expansion characteristics of the first telescopic portion 315 and the second telescopic portion 316, to ensure that the connection between the oil seal and the transmission shaft 12 is always kept in close contact, and the sealing effect can be maintained even under high-speed rotation and temperature changes.

[0048] At the same time, a retaining bar 5 is added at the lip portion 311 of the first oil seal 31 to change the flow direction of the liquid and avoid liquid leakage from the connection between the retaining bar 5 and the rear end cover 23. Instead, the liquid leaks from the connection between the retaining bar 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 redundancy of the seal. Even if the first oil seal 31 is worn or fails, the second oil seal 32 can still provide the necessary sealing effect.

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

[0051] Embodiment 2

[0052] Reference Figures 4 to 8As shown, it is the second embodiment of the present invention, which is based on the previous embodiment, and the difference is that the first oil seal 31 and the second oil seal 32 both rotate with the center line of the transmission shaft 12 as the axis, and the first oil seal 31 and the second oil seal 32 are relatively stationary; wherein, a force transmission baffle 34 is extended from the rear end of the first oil seal 31, and the force transmission baffle 34 includes two sets of parallel force transmission single lower plates 343, force transmission single upper plates 341 and connecting plates 342, and the force transmission single lower plates 343, force transmission single upper plates 341, connecting plates 342 and force transmission part 312 are connected in an integrated manner, and the force transmission single lower plate 343 is vertically inserted into the second oil seal 32, and the force transmission single upper plates 341 and the force transmission single lower plates 343 are made of nickel alloy, and the force transmission single upper plates 341 and the force transmission single lower plates 343 are made of nickel alloy, and the excellent high-temperature expansion performance is utilized to make the force transmission single upper plates 341 The radial length of the force transmission unit lower plate 343 expands and elongates under high temperature, and one end of the force transmission unit lower plate 343 is against the second oil seal 32. The force transmission unit lower plate 343 is subjected to the force transmitted by the second oil seal 32, generating a reaction force, a part of which is transmitted directly to the first oil seal 31. After the first oil seal 31 is subjected to the force, the first oil seal 31 and the rear end cover 23 are more tightly connected. At this time, the reaction force gives the rear end cover 23 more force along the axial direction of the transmission shaft 12, and the other part of the reaction force is transmitted to the force transmission unit upper plate 341 through the connecting plate 342. The force transmission unit upper plate 341 squeezes the first oil seal 31. At this time, the reaction force gives the rear end cover 23 more force perpendicular to the axial direction of the transmission shaft 12, and the first oil seal 31 is reversely reinforced by the second oil seal 32.

[0053] In summary, the second embodiment of the present invention is innovatively upgraded on the basis of the original adaptive leak-proof refrigerant pump, by adding a force transmission partition 34 at the rear end of the first oil seal 31, the partition includes a force transmission single lower plate 343, a force transmission single upper plate 341 and a connecting plate 342, and is designed to be connected in an integrated manner. At high temperatures, the force transmission single upper plate 341 and the force transmission single lower plate 343 expand and elongate radially, generating a reaction force, a part of which strengthens the connection tightness between the first oil seal 31 and the rear end cover 23 along the axial direction of the transmission shaft 12, and the other part of the force is transmitted to the force transmission single upper plate 341 through the connecting plate 342, and squeezes the first oil seal 31 perpendicularly to the axial direction, thereby enhancing the sealing effect. This design realizes that the first oil seal 31 forms self-reinforcement with the help 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, effectively preventing the leakage of refrigerant, and improving the operating efficiency and safety of the refrigerant pump.

[0054] Embodiment 3

[0055] Reference Figures 4 to 8As shown, it is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that the gap between the force transmission single lower plate 343, the first oil seal 31 and the second oil seal 32 forms an oil storage chamber, and the force transmission single lower plate 343, the first oil seal 31 and the second oil seal 32 form an oil sealing chamber. The force transmission single lower plate 343 and the central axis of the transmission shaft 12 are set at 45 degrees. If the first oil seal 31 is worn, part of the liquid enters the oil storage chamber 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 by the centrifugal force, and the splashing direction is the vertical direction of the shaft sleeve. The splashed liquid is resisted by the force transmission single lower plate 343 and then deflected, and stored in the oil storage chamber, realizing another barrier on the liquid leakage path;

[0056] If the first oil seal 31 is severely worn, the liquid inside the oil storage chamber will slowly accumulate until it fills the oil storage chamber. At this time, the excess liquid enters the oil seal chamber from the oil storage chamber.

[0057] A plurality of oil holes 344 are provided on the surface of the force transmission unit lower plate 343. The plurality of oil holes 344 are arranged in a tapered shape. The tapered hole is designed to make it easier for liquid to go out than to go in, thereby increasing the difficulty for liquid to enter the oil sealing chamber from the oil storage chamber. At the same time, the oil holes 344 are obliquely arranged inside the force transmission unit lower plate 343. In order to prevent splashing liquid from entering the oil holes 344, the aperture axis of the oil holes 344 is perpendicular to the splashing direction of the liquid.

[0058] The second oil seal 32 is composed of a triangular portion 321 and a rectangular portion 322. The second oil seal 32 is provided with a baffle 324 located at the upper part of the semicircular annular groove 323. The baffle 324 is perpendicular to the force transmission single lower plate 343. The second oil seal 32 is provided with a semicircular annular groove 323 located at the rectangular portion 322. The liquid entering the oil sealing cavity moves upward along the trajectory of the semicircular annular groove 323 under the action of centrifugal force. The semicircular annular groove 323 is obliquely convex upward to form a volume cavity for accumulating liquid. Due to the oil sealing, the first oil seal 31 and the second oil seal 32 are both driven by the transmission shaft 12. The second oil seal 32 is wrapped in the first oil seal 31 and is relatively stationary, and there is no wear state.

[0059] Among them, the center diameter line passing through the semicircular annular groove 323 is perpendicular to the force transmission single lower plate 343, and the liquid splashing on the surface of the connecting plate 342 and the liquid rotating in the semicircular annular groove 323 are deflected by the deflector 324 and deflected into the oil sealing cavity. In order to ensure the sealing between the second oil seal 32 and the transmission shaft 12, a group of triangular rings 325 are built into the triangular part 321 of the second oil seal 32. The triangular rings 325 are made of carbon fiber, 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 chamber is designed as the first layer of defense to capture the leaked oil caused by the wear of the first oil seal 31. When the oil storage chamber is filled, the excess oil will be directed to the oil sealing chamber. The oil sealing chamber serves as the second layer of defense to further slow down the leakage of the oil. Among them, the tapered hole design of the oil hole 344 ensures that the oil can be easily discharged from the oil sealing chamber, but it is difficult to enter the oil sealing chamber from the oil storage chamber, which effectively controls the direction of oil flow and reduces unnecessary leakage. At the same time, the oil hole 344 is tilted, and the aperture axis of the oil hole 344 is perpendicular to the direction of liquid splashing, which can avoid high-speed The splashed liquid during rotation directly enters the hole to reduce oil loss. At the same time, the addition of a baffle 324, which is perpendicular to the force transmission single lower plate 343, can change the flow direction of the oil and prevent the oil from impacting a large range, while helping the oil to be better distributed and circulated; the design of the semi-circular annular groove 323 allows the oil entering the oil sealing chamber to move along a specific path under the action of centrifugal force, and finally be guided to a volume chamber for accumulating liquid. This can be designed to allow the liquid to flow back to the oil storage chamber when the machine is stopped, thereby realizing the liquid reset function and ensuring that the oil does not overflow disorderly.

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

[0062] Embodiment 4

[0063] Reference Figure 2 , Figure 3FIG. 2 is a third embodiment of the present invention. The third embodiment is based on the previous embodiment, but is different in 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 by compressing air or other inert gas. The air outlet of the pressure pump 4 is connected with an air guide pipe 41. 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, so as to establish a high pressure layer between the second oil seal 32 and the third oil seal 33, and at the second It is assumed that there is a pressure sensing element 42 between the 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. It is also equipped with a microprocessor and a temperature sensor; the microprocessor is responsible for receiving data from the pressure sensor and calculating whether it is necessary to start or adjust the output of the pressure pump 4 according to a preset algorithm 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 begins to inflate the area between the second oil seal 32 and the third oil seal 33 to form a high-pressure layer, wherein the preset program includes a startup program, a pressure control program, a temperature compensation program, and an abnormality handling program.

[0065] Preset program: When the refrigerant pump is started, the preset program will be executed in a set sequence of steps, for example, the pressure pump 4 is started first, and then a high pressure layer between the second oil seal 32 and the third oil seal 33 is gradually established to ensure that the system can maintain the required sealing state at the initial start-up;

[0066] Pressure control program: This is the core part of the preset program, which 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 logic, such as increasing the output when the pressure is below a certain threshold and reducing the output when it is above the threshold. The threshold is set by technicians in this field based on historical records.

[0067] Temperature compensation program: Considering the influence of temperature changes 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 automatically adjusts the target pressure value to maintain the effectiveness of the high pressure layer without being affected by temperature fluctuations. The output of the pressure pump 4

[0068] Abnormal handling procedures: The preset procedures also include abnormal 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 of the high-pressure layer. In addition, if the pressure is too high or too low to reach a dangerous threshold, the preset program may also trigger an alarm or automatically shut down to prevent damage to the oil seal or system.

[0069] Specifically, the pressure pump 4 transports high-pressure gas to the high-pressure layer through the air duct 41, and quickly establishes 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 of the high-pressure layer is always within the set safety range; the data from the temperature sensor is also used to adjust the working parameters of the pressure pump 4 to adapt to the changes in the internal temperature of the pump body 22, to ensure 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 a stable pressure in the high-pressure layer between the second oil seal 32 and the third oil seal 33, while taking into account the change in the temperature inside the pump body 22. The preset algorithm generally includes a pressure control algorithm and a temperature compensation algorithm, and the pressure control algorithm includes a PID controller and fuzzy logic control, wherein the PID controller dynamically compensates for the deviation between the currently measured pressure value and the target pressure value by adjusting the output of the pressure pump 4.

[0071] The formula is:

[0072]

[0073] Wherein, u(t) is the controller output, Kp is the proportional gain, Ki is the integral gain, Kd is the differential gain, ▽p(t) 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 continuous monitoring of the gas in the high-pressure layer.

[0074] In some cases, the PID controller may not be able to adequately handle nonlinear or uncertain system behavior. 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 based on the data of the temperature sensor inside 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 of the high-pressure layer. Similarly, if the pressure is too high, the microprocessor will reduce the output of the pressure pump 4 to avoid excessive pressure on the oil seal, which will affect its life and sealing effect.

[0076] Through the continuous high pressure of the high-pressure layer, an isolation layer is formed between the second oil seal 32 and the third oil seal 33 to form a three-layer seal for the refrigerant pump. At the same time, when there is no leakage in the second oil seal 32, the pressure monitoring of 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 use of the first oil seal 31 and the second oil seal 32 can be reversely judged, 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 rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in 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 a mounting cavity, the mounting 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) penetrating 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) comprising 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 about 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) extends 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, and 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 a lip surface at one end thereof 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) comprises 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) comprises 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), a force transmission single upper plate (341) and a connecting plate (342), wherein the force transmission single lower plate (343), the force transmission single upper plate (341), the connecting plate (342) and the force transmission portion (312) are connected in an integral manner, and the force transmission single lower plate (343) is 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 group 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 plate (324) located at the upper part of the semicircular annular groove (323), and the baffle plate (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 unit lower plate (343); the plurality of oil holes (344) are arranged in the form of conical holes, and the oil holes (344) are obliquely disposed inside the force transmission unit 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); an air outlet of the pressure pump (4) is connected to an air guide pipe (41); 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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