Jet type ceramic vacuum generator

Abstract

The utility model relates to a jet type ceramic vacuum generator, which comprises a nozzle and an ejector main body, the ejector main body is provided with a transversely through ejector hole, the nozzle is connected with the inlet end of the ejector hole, the nozzle is provided with a nozzle coaxial with the ejector hole, and the nozzle is connected with the ejector hole. The ejector hole comprises an inlet cylindrical section, a first conical section, a second conical section, a small-diameter cylindrical section, a diffusion conical section and an outlet cylindrical section which are sequentially connected in the direction from an inlet to an outlet, the first conical section and the second conical section are each in a conical shape with the hole diameter gradually reduced, and the diffusion conical section is in a conical shape with the hole diameter gradually increased. The air inlet cylinder section is provided with an air inlet in the radial direction. The air inlet cylinder section is small in size, light in weight and compact in structure; installation is simple, maintenance is convenient, and noise is low due to the fact that no mechanical transmission part exists; and the main parts of the nozzle and the ejector main body are made of ceramics, so that the nozzle is wear-resistant and corrosion-resistant.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum generators, in particular to a jet-type ceramic vacuum generator. Background Art

[0002] The pressure steam sterilizer uses the principle of thermal factors to kill microorganisms. After the cold air in the inner room is removed according to the specified sterilization process, saturated moist hot steam is used as the sterilization factor. In a high temperature, high pressure and high humidity environment, according to the combined effect of a certain pressure and time, it can sterilize items that can be penetrated by steam.

[0003] Currently, most sterilizers on the market use water ring vacuum pumps, piston vacuum pumps or diaphragm vacuum pumps for evacuation.

[0004] Diaphragm vacuum pump: 1. The diaphragm itself is of poor quality and has no elasticity. 2. There is a pressure difference in the unit, which causes the pneumatic diaphragm vacuum pump to be over-pressurized, and the diaphragm is subjected to an increased instantaneous force, resulting in rupture. 3. The support sleeve of the diaphragm control rod is severely worn, causing the control rod to be eccentric and sink, increasing the force on the diaphragm and easily tearing the diaphragm. 4. The air in the diaphragm chamber is not completely discharged, and the volume of the gas changes with the change of the driving hydraulic pressure, forming an air hammer, increasing the force on the diaphragm part and breaking the diaphragm.

[0005] Piston vacuum pump: Since the piston is a moving part, piston wear is inevitable. As the number of overhauls increases, the working vacuum will continue to decline until it cannot meet production requirements. This type of pump has high noise, high wear, and high failure rate, which are also its fatal shortcomings. Customers may need to replace it after a few years of use.

[0006] Water ring vacuum pump: 1. Low efficiency, generally around 30%, and the better ones can reach 50%. 2. Low vacuum degree, which is not only due to structural limitations, but more importantly, it is limited by the saturated vapor pressure of the working fluid. Using water as the working fluid, the ultimate pressure can only reach 2000-4000Pa. Using oil as the working fluid, it can reach 130Pa. 3. The price is relatively high. The water ring vacuum pumps generally used for sterilizers on the market range from 3,000 to 6,000 yuan. The higher-priced ones, such as the Nash water ring vacuum pump, have a market price of around 6,000 yuan. The domestic Yuhuan water ring pump costs around 4,000 yuan, and is generally used in large sterilizers.

[0007] In order to solve the problem of sterilizer evacuation, a water-jet ceramic vacuum generator was invented. Utility Model Content

[0008] The utility model aims at the deficiencies of the prior art and provides a jet-type ceramic vacuum generator, which has the advantages of high evacuation limit, wear resistance, corrosion resistance, long service life, low cost and improved sterilizer performance.

[0009] The utility model is realized through the following technical scheme, providing a jet-type ceramic vacuum generator, comprising a nozzle and an ejector body, wherein a transversely penetrating ejector hole is opened on the ejector body, the nozzle is connected to the inlet end of the ejector hole, and a nozzle coaxial with the ejector hole is opened on the nozzle, and the ejector hole comprises an inlet cylindrical section, a first conical section, a second conical section, a small-diameter cylindrical section, a diffuser conical section and an outlet cylindrical section which are sequentially connected from the inlet to the outlet direction, the first conical section and the second conical section are both cones with gradually decreasing apertures, the diffuser conical section is a cone with gradually increasing aperture, and an air inlet is radially opened on the inlet cylindrical section.

[0010] In this scheme, when the pressure steam sterilizer starts the evacuation process, water with a certain pressure flows from the nozzle into the injector hole of the injector body. Since the injection water flow velocity is high, a negative pressure is formed around it. The sterilizer cavity is a closed container. The condenser, air and steam inside the cavity are sucked away by the negative pressure formed by the air inlet, so that negative pressure is gradually formed inside the cavity, thereby realizing the vacuum operation.

[0011] As an optimization, the nozzle is conical and its diameter gradually decreases, so as to increase the flow rate of the water sprayed from the nozzle.

[0012] As an optimization, the cone vertex of the nozzle is located at the first cone section, thereby improving the negative pressure effect at the air inlet position.

[0013] As an optimization, the inlet of the nozzle is equipped with a first one-way valve that opens toward the nozzle to prevent the water from flowing in the reverse direction.

[0014] As an optimization, the inlet of the first one-way valve is connected with an inlet straight head, and the outlet of the injector hole is connected with an outlet straight head. The inlet straight head and the outlet straight head are used to connect the inlet and outlet pipelines respectively.

[0015] As an optimization, the air inlet is provided with a second one-way valve which opens toward the air inlet. The second one-way valve in this solution is used to prevent the gas inside the cavity from flowing back and to maintain the pressure.

[0016] As an optimization, the inlet of the second one-way valve is equipped with a connecting elbow for connecting with a pressure steam sterilizer to realize vacuum operation.

[0017] As an optimization, the inlet cylindrical section is provided with an internal thread connected to the nozzle, so as to realize the threaded connection between the nozzle and the injector body.

[0018] As an optimization, the taper of the first cone section is greater than the taper of the second cone section, so as to better form the vacuum and improve the vacuum degree.

[0019] The beneficial effects of the utility model are as follows: the jet-type ceramic vacuum generator of the utility model is small in size, light in weight, and compact in structure; it is easy to install and maintain, and because there is no mechanical transmission part, the noise is low; it has a long service life, and the main components, the nozzle and the ejector body, are made of ceramic, which is wear-resistant and corrosion-resistant. After a few years of use, the conventional brass or aluminum materials will have the nozzle and ejector body flow channels widened due to long-term high-speed water flow friction, reducing the vacuum limit, and the characteristics of the ceramic material greatly reduce this problem; it is low in cost, and the cost of the nozzle and ejector body made of molds is reduced by about one-fifth compared with the processing technology of brass or aluminum.

[0020] The vacuum pump has a high evacuation limit. Compared with the commonly used diaphragm vacuum pumps, piston vacuum pumps and water ring vacuum pumps on the market, it not only has the advantages of low cost, simple structure, easy maintenance and long life, but the most important thing is that the vacuum pump has a better evacuation limit, which can reach between -95KPa and -99KPa; the temperature uniformity and drying effect are good. Since the water-jet ceramic vacuum generator has an ultra-high evacuation limit, the saturated steam degree of pressure steam sterilization is improved, the temperature uniformity in the sterilization stage is better, and the dryness of the sterilized items is higher in the drying stage.

[0021] The utility model has a wide range of applications and is mainly used in vacuum and evaporation systems to carry out vacuum water extraction, vacuum evaporation, vacuum filtration, vacuum crystallization, drying, deodorization and other processes. It is equipment widely needed in sugar making, pharmaceuticals, chemicals, food, salt making, monosodium glutamate, milk, fermentation and some light industry and defense departments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 It is a cross-sectional view of the connection between the nozzle and the injector body of the utility model;

[0024] Figure 3 It is a cross-sectional view of the main body of the injector of the utility model;

[0025] Figure 4 It is a cross-sectional view of the nozzle of the utility model;

[0026] Figure 5 This is a schematic diagram of the disassembly of the utility model;

[0027] As shown in the figure:

[0028] 1. Inlet straight head, 2. First one-way valve, 3. Nozzle, 4. Injector body, 5. Connecting thread, 6. Second one-way valve, 7. Connecting elbow, 8. Outlet straight head, 31. Nozzle, 32. Conical protrusion, 41. Air inlet, 42. Inlet cylindrical section, 43. First conical section, 44. Second conical section, 45. Small-diameter cylindrical section, 46. Diffusing conical section, 47. Outlet cylindrical section. DETAILED DESCRIPTION

[0029] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0030] like Figures 1 to 5 As shown, a jet-type ceramic vacuum generator of the utility model comprises a nozzle 3 and an ejector body 4, wherein the ejector body 4 is provided with an ejector hole which runs transversely therethrough, the nozzle 3 is connected to the inlet end of the ejector hole, a high-speed water flow enters the ejector hole from the nozzle 3, and flows from the inlet of the ejector hole toward the outlet.

[0031] The nozzle 3 is provided with a nozzle opening 31 coaxial with the ejector hole, and the nozzle opening 31 is conical and has a gradually decreasing diameter, thereby increasing the velocity of the ejected water flow. The gradually decreasing diameter in the present application refers to a gradually decreasing diameter along the water flow direction.

[0032] The inlet of the nozzle 3 is equipped with a first one-way valve 2 that opens in the direction of the nozzle 3 to prevent water from flowing back. The inlet of the first one-way valve 2 is connected to an inlet straight connector 1 to achieve connection with a high-pressure water source. The outlet of the ejector hole is connected to an outlet straight connector 8 to achieve connection with a water discharge pipe.

[0033] The injector hole includes an inlet cylindrical section 42, a first cone section 43, a second cone section 44, a small diameter cylindrical section 45, a diffusion cone section 46 and an outlet cylindrical section 47 which are sequentially connected from the inlet to the outlet. The inlet cylindrical section 42 is a cylindrical hole and is provided with an internal thread connected to the nozzle 3.

[0034] A conical protrusion 32 protrudes forward from the front end of the nozzle 3 . The conical protrusion 32 extends into the inlet cylindrical section 42 . The conical protrusion 32 is coaxially arranged with the nozzle 31 .

[0035] The inlet cylindrical section 42 is radially provided with an air inlet 41. The air inlet 41 is located just below the front end of the nozzle 31, and the air inlet 41 is provided with a second one-way valve 6 opened toward the air inlet 41. The inlet of the second one-way valve 6 is provided with a connecting elbow 7. The second one-way valve 6 is connected to the second one-way valve 6 through a connecting thread 5.

[0036] The first conical section 43 and the second conical section 44 are both conical with gradually decreasing apertures, and the taper of the first conical section 43 is greater than the taper of the second conical section 44. The cone vertex of the nozzle 31 is located at the first conical section 43.

[0037] The small diameter cylindrical section 45 is cylindrical and is the part with the smallest diameter in the entire injector hole. The diffusion cone section 46 is a cone with a gradually increasing aperture. The outlet cylindrical section 47 is cylindrical and is connected to the outlet straight head 8 through threads.

[0038] The use method of the utility model is as follows: when the pressure steam sterilizer starts to run the evacuation process, water with a certain pressure enters from the inlet straight head 1, passes through the first one-way valve 2, the nozzle 3, the ejector body 4 and the outlet straight head 8 in sequence, and then flows out. The nozzle 31 of the nozzle 3 is a cone with a certain slope, and the inside of the ejector body also has a certain slope, which converges at a focus. Since the speed of the ejected water flow is relatively high, negative pressure is formed around it.

[0039] The sterilizer cavity is a closed container. The condenser, air and steam inside the cavity enter from the connecting elbow 7, pass through the second one-way valve 6 and the connecting thread 5, and are sucked away by the negative pressure formed, so that negative pressure is gradually formed inside the cavity. The function of the second one-way valve 6 is to prevent the gas inside the cavity from flowing back and to maintain the pressure.

[0040] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A jet-type ceramic vacuum generator, characterized in that: The invention comprises a nozzle (3) and an injector body (4), wherein the injector body (4) is provided with an injector hole which runs through transversely, the nozzle (3) is connected to the inlet end of the injector hole, the nozzle (3) is provided with a nozzle (31) which is coaxial with the injector hole, the injector hole comprises an inlet cylindrical section (42), a first conical section (43), a second conical section (44), a small diameter cylindrical section (45), a diffuser conical section (46) and an outlet cylindrical section (47) which are connected in sequence from the inlet to the outlet, the first conical section (43) and the second conical section (44) are both in the shape of cones with gradually decreasing apertures, the diffuser conical section (46) is in the shape of cones with gradually increasing apertures, and the inlet cylindrical section (42) is provided with an air inlet (41) in a radial direction.

2. A jet-type ceramic vacuum generator according to claim 1, characterized in that: The nozzle (31) is conical and its diameter gradually decreases.

3. A jet-type ceramic vacuum generator according to claim 2, characterized in that: The cone apex of the nozzle (31) is located in the first cone section (43).

4. The jet-type ceramic vacuum generator according to claim 1, characterized in that: The inlet of the nozzle (3) is provided with a first one-way valve (2) which opens in the direction of the nozzle (3).

5. The jet-type ceramic vacuum generator according to claim 4, characterized in that: The inlet of the first one-way valve (2) is connected to an inlet straight head (1), and the outlet of the injector hole is connected to an outlet straight head (8).

6. The jet-type ceramic vacuum generator according to claim 1, characterized in that: The air inlet (41) is provided with a second one-way valve (6) which opens in the direction of the air inlet (41).

7. The jet-type ceramic vacuum generator according to claim 6, characterized in that: The inlet of the second one-way valve (6) is provided with a connecting elbow (7).

8. The jet-type ceramic vacuum generator according to claim 1, characterized in that: The inlet cylindrical section (42) is provided with an internal thread connected to the nozzle (3).

9. The jet-type ceramic vacuum generator according to claim 1, characterized in that: The taper of the first conical section (43) is greater than the taper of the second conical section (44).

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