Water-cooling oil-free vacuum pump

Abstract

The water-cooling oil-free vacuum pump comprises an air cylinder (2) and a vacuumizing assembly arranged in the air cylinder (2) in a matched mode, the vacuumizing assembly is used for vacuumizing, a mist spraying hole (5) is formed in the side wall of the air cylinder (2) and communicates with a water source (6) through a flow channel, and liquid in the flow channel can be sprayed out through the mist spraying hole (5) to form mist after being pressurized; the flow channel is arranged on the outer wall face of the air cylinder (2) and covered by the sealing cover (9) to form a water cavity, and liquid flowing through the flow channel cools the air cylinder (2) at the same time and preheats the liquid before being sprayed out through the mist spraying holes (5). The cooling performance can be improved, and residues are not prone to occurring after spraying.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pumps, in particular to a water-cooled oil-free vacuum pump. Background Art

[0002] As an important general industrial equipment, oil-free screw vacuum pump is widely used in the fields of foam, paper tray, transportation, etc. Since the vacuum pump compression chamber is oil-free and has no cooling lubricant, the vacuum pump temperature is high, and parts are prone to high-temperature expansion, which eventually leads to vacuum components (such as screws) scraping the cylinder or seizing. The cooling of conventional oil-free cooling vacuum pumps is mainly low-temperature gas entering the vacuum pump to take away heat. Since the vacuum pump has a small air intake, especially when the vacuum becomes higher, as the vacuum degree increases, its operating temperature also increases, which can easily lead to high temperatures and cause failures.

[0003] At present, there are proposals to use water spray cooling for cooling. For example, a water spray type single-screw vacuum pump disclosed in the authorization announcement number CN206668551U proposes that "the casing is provided with a main engine water spray hole, and the main engine water spray hole is connected to the internal cavity of the casing" and "the sprayed water can play the role of lubrication, cooling, noise reduction and sealing". Although the cooling effect of the sprayed water is improved, how to improve the cooling performance and not easily leave residue after spraying still needs further improvement. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and propose a water-cooled oil-free vacuum pump, which is beneficial to improving the cooling performance and is not easy to leave residue after injection.

[0005] Compared with the prior art, the present invention proposes a water-cooled oil-free vacuum pump, comprising a cylinder and a vacuum pumping component matched in the cylinder, the vacuum pumping component is used for vacuuming, a spray hole is provided in the side wall of the cylinder, the spray hole is connected with a water source through a flow channel, and the liquid in the flow channel can be sprayed out through the spray hole to form a spray after being pressurized; the flow channel is provided on the outer wall surface of the cylinder, and the flow channel is covered by a cover to form a water cavity, and the liquid flowing through the flow channel cools down the cylinder at the same time, and the liquid is preheated before being sprayed out through the spray hole.

[0006] After adopting the above structure, compared with the prior art, the present invention has the following advantages:

[0007] Since a water cavity is formed on the outer wall of the cylinder, the fluid first absorbs heat to cool the cylinder before being sprayed into the cylinder. This achieves the cooling purpose on the one hand, and on the other hand, the liquid is preheated before being sprayed into the cylinder. When the preheated liquid is sprayed into the cylinder, it has a better atomization effect. The better atomization effect allows the atomized water vapor to be quickly distributed in the cylinder, forming a heat absorption and cooling effect. At the same time, due to further heat absorption and full water vaporization, it is conducive to being discharged during the compression process and is not easy to remain. Therefore, the present disclosure is conducive to improving the cooling performance, and it is not easy to remain after being sprayed.

[0008] As an improvement, the spray holes are distributed in the flow channel, and the spray holes directly take water from the flow channel.

[0009] As an improvement, the flow channel includes a first flow channel and a second flow channel arranged on the two lateral side walls of the cylinder, and there is an air cavity between the two side walls. The vacuum pumping component moves in the air cavity to perform vacuum pumping; the first flow channel is used to form a first water cavity, and the second flow channel is used to form a second water cavity.

[0010] As an improvement, the first flow channel is provided with a water inlet hole, the second flow channel is provided with a water outlet hole, and a connecting water channel is provided between the first flow channel and the second flow channel. Water flows through the water inlet hole, the first flow channel, the connecting water channel, the second flow channel, and the water outlet hole in sequence. The connecting water channel adopts a pipeline or a flow channel arranged on the cylinder.

[0011] As an improvement, the communicating water channel is arranged in a transverse linear manner at the bottom of the cylinder.

[0012] As an improvement, the water inlet is located on the upper left side of the first flow channel, a spray hole is set in the rear section of the first flow channel, and an inlet of a connecting water channel is set at the end, and water enters the second flow channel through the connecting water channel. The second flow channel extends to the upper right corner and goes back to the part where the suction chamber of the cylinder is located. The rear section of the second flow channel is in the part where the suction chamber of the cylinder is located, a spray hole is set in the rear section of the second flow channel, and a water outlet is set at the end of the second flow channel.

[0013] As an improvement, a water outlet hole is set at the end of the second flow channel, and the water outlet hole can be directly connected to the water outlet pipe, or a water outlet cavity can be set at the bottom of the cylinder, and the water outlet cavity includes a cover, and a connecting outlet is set on the cover. The water outlet cavity can be integrally formed with an opening when manufacturing the cylinder, and then the opening is sealed with the cover.

[0014] As an improvement, a water pump is also included. The water pump is arranged in a water cycle constructed by a water source and a flow channel to pressurize the water to ensure spraying.

[0015] As an improvement, it also includes a control unit, a temperature detection unit and a first valve. The temperature detection unit is electrically connected to the control unit. The temperature detection unit is used to detect the temperature of the vacuum pump. When the temperature is greater than T, the control unit controls the first valve to open to allow fluid to flow into the flow channel.

[0016] As an improvement, the control unit controls the first valve to open so as to allow fluid to flow into the flow channel, which means that: the first valve adopts a solenoid valve, which is electrically connected to the control unit, and when the temperature is greater than T, the control unit controls the solenoid valve to open so as to allow fluid to flow into the flow channel, or, the first valve adopts a one-way valve, and when the temperature is greater than T, the control unit controls the pump to pressurize the fluid so that the one-way valve opens to allow fluid to flow into the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of a water-cooled oil-free vacuum pump.

[0018] Figure 2 This is a three-dimensional schematic diagram of a water-cooled oil-free vacuum pump with the cylinder removed.

[0019] Figure 3 It is a three-dimensional schematic diagram of a water-cooled oil-free vacuum pump from the bottom perspective.

[0020] Figure 4 It is a stereoscopic schematic diagram of a cylinder of a water-cooled oil-free vacuum pump from one side perspective.

[0021] Figure 5 It is a stereoscopic schematic diagram of the other side of the two sides of the cylinder of a water-cooled oil-free vacuum pump.

[0022] Figure 6 The end view of the cylinder of a water-cooled oil-free vacuum pump.

[0023] Figure 7 It is the AA section view.

[0024] Figure 8 It is a three-dimensional schematic diagram mainly showing the first flow channel.

[0025] Fig. 9 It is a three-dimensional schematic diagram mainly showing the second flow channel.

[0026] Fig.10 This is a schematic diagram of the principle of a pressurized water cycle.

[0027] Explanation of the reference numerals: 1. suction chamber, 2. cylinder, 3. male rotor, 4. female rotor, 5. spray hole, 6. water source, 7. water inlet hole, 8. water outlet hole, 9. sealing cover, 10. first flow channel, 11. second flow channel, 12. connecting water channel, 13. water pump, 14. air inlet hole, 15. exhaust hole, 16. compression chamber, 17. water inlet pipe, 18. water outlet pipe, 19. outlet shaft, 20. opening, 21. cover, 22. connecting outlet, 23. temperature detection unit, 24. first valve. DETAILED DESCRIPTION

[0028] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0029] The present invention is further described in detail below:

[0030] For the convenience of description and understanding, the directional description is used for illustration only and does not constitute a limitation on the scope of protection of rights.

[0031] Figure 7 The arrows shown in the figure indicate the direction of vacuuming.

[0032] like Figures 1 to 10 As shown, the present disclosure proposes a water-cooled oil-free vacuum pump, including a cylinder 2 and a vacuum pumping component matched in the cylinder 2, the vacuum pumping component is used for vacuuming, a spray hole 5 is provided in the side wall of the cylinder 2, the spray hole 5 is connected with a water source 6 through a flow channel, and the liquid in the flow channel can be sprayed out through the spray hole 5 to form a spray after being pressurized; the flow channel is provided on the outer wall surface of the cylinder 2, and the flow channel is covered by a cover 9 to form a water cavity, and the liquid flowing through the flow channel cools down the cylinder 2 at the same time, and the liquid is preheated before being sprayed out through the spray hole 5.

[0033] Water is just a synonym. Any suitable cooling liquid is applicable to the present disclosure. Of course, pure water that has been filtered is more suitable for the present disclosure in terms of reducing costs.

[0034] The spray hole 5 can be set as a spray nozzle, or a hole can be set on the pump body of the vacuum pump, and the spray nozzle is installed in the hole. Of course, any structural solution suitable for forming a mist can be applied to the present disclosure.

[0035] For further integrated arrangement, the spray holes 5 are distributed in the flow channel, and the spray holes 5 directly take water from the flow channel. After such design, in the case of multiple spray holes 5, it is convenient to arrange and connect the spray holes 5.

[0036] In some embodiments, the flow channel includes a water inlet hole 7 and a water outlet hole 8, and the water source 6 is connected to the water inlet hole 7 and the water outlet hole 8 respectively, so as to form a water circulation. After such a design, the continuous water circulation will fully guarantee the water supply to the spray hole 5. In addition, the circulating flow allows the water pressure in the flow channel to be maintained.

[0037] In the design of the circulation flow scheme, the water source 6 can be a water tank, and the water tank and the vacuum pump can be connected by a water inlet pipe 17 and a water outlet pipe 18.

[0038] In order to better control the water pressure, Fig.10 As shown, a water pump 13 is also included, which is arranged in the water cycle formed by the water source 6 and the flow channel to pressurize the water. The water pump 13 can adopt the existing technology.

[0039] In this example, if Figure 4 , 5 As shown in , 8 and 9, at least the flow channel is provided in the cylinder 2 itself, and the water in the flow channel can also be used to cool the cylinder 2 itself. Thus, multiple goals are achieved at one stroke. In addition, the temperature of the cylinder 2 is lowered, which is conducive to improving the working performance of the vacuum pump.

[0040] In order to improve the cooling performance and atomization effect, such as Figure 2 , 3 As shown in Figure 4, a flow channel is provided on the outer wall surface of the cylinder 2, and the flow channel is covered by a cover 9 to form a water cavity, which can also be called a water tank.

[0041] In this example, if Figure 1 , 2 As shown in Figures 4, 5, 8 and 9, a first flow channel 10 and a second flow channel 11 are respectively provided on the two lateral walls of the cylinder 2, and an air cavity is formed between the two side walls. The vacuum pumping assembly moves in the air cavity to perform vacuum pumping. An air inlet 14 is provided on the upper side of the air cavity, and an exhaust hole 15 is provided on the lower side of the air cavity.

[0042] In this example, the vacuum pumping assembly is a twin-screw structure, specifically, it includes a male rotor 3 and a female rotor 4. The male rotor 3 is provided with an output shaft 19, and the output shaft 19 is used to connect to a power source, such as an electric motor. The male rotor 3 and the female rotor 4 cooperate with each other to form a process of pushing the gas to move from the suction hole, the suction chamber 1, the compression chamber 16, and the exhaust hole 15. The suction chamber 1 and the compression chamber 16 constitute the air chamber.

[0043] Since the first flow channel 10 and the second flow channel 11 are respectively provided on the two lateral side walls of the cylinder 2, the first flow channel 10 forms a first water cavity, and the second flow channel 11 forms a second water cavity, thereby realizing large-area cooling of the cylinder 2. In this example, the first flow channel 10 and the second flow channel 11 are both labyrinth flow channels, thus having a better cooling effect.

[0044] In order to further improve the integration level, such as Figure 8 , 9 As shown, the first flow channel 10 is provided with a water inlet hole 7, the second flow channel 11 is provided with a water outlet hole 8, and a connecting water channel 12 is provided between the first flow channel 10 and the second flow channel 11. Water flows through the water inlet hole 7, the first flow channel 10, the connecting water channel 12, the second flow channel 11, and the water outlet hole 8 in sequence. The connecting water channel 12 adopts a pipeline or a flow channel arranged on the cylinder 2. In this example, the connecting water channel 12 adopts a flow channel arranged on the cylinder 2, which has a higher degree of integration.

[0045] In this example, if Figure 7, 8 As shown in Figure 9, the communicating water channel 12 is arranged in a horizontal straight line at the bottom of the cylinder 2. After such a design, a shorter communicating path is provided. In addition, at the bottom, there is a larger space for arranging a communicating water channel 12 with a larger cross section.

[0046] In this example, if Figure 8 As shown, the water inlet 7 is located at the upper left side of the first flow channel 10, the spray hole 5 is arranged at the rear section of the first flow channel 10, and the inlet of the connecting water channel 12 is arranged at the end, and water enters the second flow channel 11 through the connecting water channel 12, that is, Fig. 9 As shown, in order to simplify the production, the connecting water channel 12 is arranged in a horizontal straight line at the bottom of the cylinder 2, so the outlet of the connecting water channel 12 will be located at the part where the suction chamber 1 of the cylinder 2 is located. At this time, in order to allow the second flow channel 11 to cool the cylinder 2, the second flow channel 11 is arranged to Fig. 9 The upper right corner shown extends and goes back to the part where the air suction chamber 1 of the cylinder 2 is located. At this time, the rear section of the second flow channel 11 is located at the part where the air suction chamber 1 of the cylinder 2 is located, and the spray hole 5 can be set in the rear section of the second flow channel 11 to meet the position requirement of the spray hole 5.

[0047] The end of the second flow channel 11 is provided with a water outlet 8, and the water outlet 8 can be directly connected to the water outlet pipe 18, or a water outlet cavity can be provided at the bottom of the cylinder 2, such as Figure 7 , 9 As shown, the water outlet chamber includes a cover 21, and a connecting outlet 22 is provided on the cover 21, and the connecting outlet 22 is used to connect the water outlet pipe 18. The above design is conducive to hiding the water outlet pipe 18. In addition, the water outlet chamber can be integrally formed with an opening 20 when manufacturing the cylinder 2, and then the cover 21 is used to seal the opening 20, thereby simplifying the production and reducing the production cost.

[0048] As can be seen from the above, the present disclosure provides a spray hole 5 on the side of the cylinder 2. In this example, the specific position of the spray hole 5 is in front of the envelope of the cylinder 2, in the main engine suction chamber 1. Of course, the spray hole 5 can also be separately set or additionally set at other positions, for example, the spray hole 5 can also be set in the compression chamber 16 of the cylinder 2.

[0049] Preferably, the suction chamber 1 is provided with a spray hole 5. In this way, since the vacuum pump has a relatively high temperature, it means that the cylinder 2 in the vacuum pump has a relatively high temperature. Then, the water mist sprayed into the suction chamber 1 has a cooling effect on the one hand, and evaporates due to the heat on the other hand, and is not easy to form droplets. From the suction hole 14 to the exhaust hole 15 of the suction chamber 1, the temperature is increased, so it is even more difficult to form droplets at the exhaust hole 15, which is beneficial to reduce the water flow phenomenon of the exhaust hole 15 of the vacuum pump.

[0050] Specifically, in this example, Figure 1 ,4 As shown in FIGS. 5, 7, 8 and 9, the water inlet 7 is located at the upper left side of the first flow channel 10, the spray hole 5 is arranged at the rear section of the first flow channel 10, and the inlet of the connecting water channel 12 is arranged at the end, and water enters the second flow channel 11 through the connecting water channel 12. The second flow channel 11 extends to the upper right corner and goes back to the part where the air suction chamber 1 of the cylinder 2 is located. The rear section of the second flow channel 11 is at the part where the air suction chamber 1 of the cylinder 2 is located, and the spray hole 5 is arranged at the rear section of the second flow channel 11, and the water outlet hole 8 is arranged at the end of the second flow channel 11. Thus, the purpose of arranging the spray hole 5 on one side of the air suction chamber 1 is achieved.

[0051] The number of the spray holes 5 can be one or more. Figure 4 , 5 As shown in FIGS. 8 and 9 , each side wall is provided with six spray holes 5 , which are formed by respectively penetrating the two lateral walls of the cylinder 2 .

[0052] In some embodiments, it also includes a control unit, a temperature detection unit 23 and a first valve 24. The temperature detection unit 23 is electrically connected to the control unit. The temperature detection unit 23 is used to detect the temperature of the vacuum pump. When the temperature is greater than T, the control unit controls the first valve 24 to open to allow fluid to flow into the flow channel.

[0053] like Figure 3 As shown, the temperature detection unit 23 can be arranged near the exhaust hole 15, so as to have a faster response performance, that is, when the temperature of the main machine part near the exhaust hole 15 reaches T, the fluid is introduced. Such a position is conducive to timely cooling and avoids the problem of vacuum component scraping the cylinder or biting.

[0054] Furthermore, the control unit controls the first valve 24 to open so as to allow fluid to flow into the flow channel, which means that: the first valve 24 adopts an electromagnetic valve, which is electrically connected to the control unit, and when the temperature is greater than T, the control unit controls the electromagnetic valve to open so as to allow fluid to flow into the flow channel, or, the first valve 24 adopts a one-way valve, and when the temperature is greater than T, the control unit controls the pump to pressurize the fluid so that the one-way valve opens to allow fluid to flow into the flow channel.

[0055] The first valve 24, temperature sensor, water pump 13, spray nozzle, and control unit can all adopt existing technologies. For example, the first valve 24 adopts a one-way valve, a solenoid valve, etc. in the existing technology, a temperature sensor in the existing technology, a water pump 13 in the existing technology, and a spray nozzle in the existing technology. The control unit that controls the opening and closing of the first valve 24 and the water pump 13 can be a control circuit constructed by a general-purpose single-chip microcomputer.

[0056] In the present disclosure, for example, when the host runs to T of 100°C, water is passed through the first water chamber and the second water chamber (the water pressure is greater than or equal to the tap water pressure. If tap water is connected, the tap water pressure can be used, but in order to maintain a certain water pressure, it is preferred to use a water pump 13 for pressurization). The cooling water enters the first water chamber from the water inlet hole 7 and then enters the connecting water channel 12, and then enters the second water chamber and the water outlet hole 8. In addition, the setting of the water outlet chamber allows the cooling water from the water outlet hole 8 to enter the water outlet chamber. This process can cool the main body shell. During the operation of the main body, the cooling water is sprayed in the form of mist to cool the air cavity through the spray hole 5. Since the temperature of the main body will be higher than 100°C during continuous operation, the mist water sprayed into the air cavity will further evaporate into the gas and be discharged from the main body with the gas, thereby reducing the operating temperature of the main body and not easily remaining.

[0057] When understanding the present invention, if necessary, the above structure can refer to other embodiments / appendices. Figure 1 And understand, no further elaboration here.

[0058] The above description is only an illustrative embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the patent protection scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A water-cooled oil-free vacuum pump, comprising a cylinder (2) and a vacuum pumping component matched in the cylinder (2), the vacuum pumping component being used for vacuuming, characterized in that: A spray hole (5) is provided in the side wall of the cylinder (2), and the spray hole (5) is connected to a water source (6) through a flow channel. The liquid in the flow channel can be sprayed out through the spray hole (5) to form a spray after being pressurized. The flow channel is provided on the outer wall surface of the cylinder (2), and the flow channel is covered by a cover (9) to form a water cavity. The liquid flowing through the flow channel cools the cylinder (2) and is preheated before being sprayed out through the spray hole (5).

2. A water-cooled oil-free vacuum pump according to claim 1, characterized in that: The spray holes (5) are distributed in the flow channel, and the spray holes (5) directly take water from the flow channel.

3. A water-cooled oil-free vacuum pump according to claim 1 or 2, characterized in that: The flow channel comprises a first flow channel (10) and a second flow channel (11) arranged on two lateral side walls of the cylinder (2); an air cavity is formed between the two side walls, and the vacuum pumping component moves in the air cavity to perform vacuum pumping; the first flow channel (10) is used to form a first water cavity, and the second flow channel (11) is used to form a second water cavity.

4. A water-cooled oil-free vacuum pump according to claim 3, characterized in that: The first flow channel (10) is provided with a water inlet hole (7), the second flow channel (11) is provided with a water outlet hole (8), a connecting water channel (12) is provided between the first flow channel (10) and the second flow channel (11), water flows through the water inlet hole (7), the first flow channel (10), the connecting water channel (12), the second flow channel (11), and the water outlet hole (8) in sequence, and the connecting water channel (12) is a pipeline or a flow channel provided on the cylinder (2).

5. A water-cooled oil-free vacuum pump according to claim 4, characterized in that: The communicating water channel (12) is arranged in a transverse linear manner at the bottom of the cylinder (2).

6. A water-cooled oil-free vacuum pump according to claim 4, characterized in that: The water inlet (7) is located at the upper left side of the first flow channel (10), the rear section of the first flow channel (10) is provided with a spray hole (5), and the inlet of the connecting water channel (12) is provided at the end, and water enters the second flow channel (11) through the connecting water channel (12), the second flow channel (11) extends to the upper right corner and goes back to the part where the air suction chamber (1) of the cylinder (2) is located, the rear section of the second flow channel (11) is located at the part where the air suction chamber (1) of the cylinder (2) is located, the spray hole (5) is provided at the rear section of the second flow channel (11), and the water outlet hole (8) is provided at the end of the second flow channel (11).

7. A water-cooled oil-free vacuum pump according to claim 4, characterized in that: A water outlet hole (8) is provided at the end of the second flow channel (11). The water outlet hole (8) can be directly connected to a water outlet pipe, or a water outlet cavity can be provided at the bottom of the cylinder (2). The water outlet cavity includes a cover (21), and a connecting outlet (22) is provided on the cover (21). The water outlet cavity can be integrally formed with an opening (20) when manufacturing the cylinder (2), and then the opening (20) is sealed by the cover (21).

8. The water-cooled oil-free vacuum pump according to claim 1, characterized in that: It also includes a water pump (13), which is arranged in the water cycle constructed by the water source (6) and the flow channel to pressurize the water to ensure spraying.

9. The water-cooled oil-free vacuum pump according to claim 1, characterized in that: It also includes a control unit, a temperature detection unit (23) and a first valve (24). The temperature detection unit (23) is electrically connected to the control unit. The temperature detection unit (23) is used to detect the temperature of the vacuum pump. When the temperature is greater than T, the control unit controls the first valve (24) to open so as to allow fluid to flow into the flow channel.

10. The water-cooled oil-free vacuum pump according to claim 1, characterized in that: The control unit controls the first valve (24) to open so as to allow fluid to flow into the flow channel, which means that: the first valve (24) is a solenoid valve, which is electrically connected to the control unit, and when the temperature is greater than T, the control unit controls the solenoid valve to open so as to allow fluid to flow into the flow channel, or the first valve (24) is a one-way valve, and when the temperature is greater than T, the control unit controls the pump to pressurize the fluid so that the one-way valve opens to allow fluid to flow into the flow channel.

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