CN214683313U

CN214683313U - Low-noise and quick-cleaning dry ice nozzle and dry ice spraying cleaning machine

Info

Publication number: CN214683313U
Application number: CN202120712977.1U
Authority: CN
Inventors: 陈昌中; 吴继青; 柴国丰; 王星瑞; 吴扬军; 张斌
Original assignee: Gree Electric Appliances Inc of Zhuhai; Gree Nanjing Electric Appliances Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Gree Nanjing Electric Appliances Co Ltd
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-11-12
Anticipated expiration: 2031-04-08

Abstract

The utility model discloses a low noise, quick clear dry ice nozzle and dry ice spray cleaning machine. The dry ice nozzle comprises a nozzle cylinder, one end of the nozzle cylinder is a connecting hole, the other end of the nozzle cylinder is a rectangular flat conical hole, the large end of the rectangular flat conical hole faces outwards, the small end of the rectangular flat conical hole is communicated with the connecting hole through an air passage, and the sectional area of the air passage is smaller than that of the connecting hole and that of the small end of the rectangular flat conical hole. Because the nozzle spout is the flat taper hole of rectangle, longer air flue is with the flat taper hole of rectangle and connecting hole intercommunication for the spray angle of the dry ice particle that sprays out is wider, and coverage is bigger, is difficult for haring the work piece surface. The qualified rate of one-time cleaning of the dry ice cleaning equipment using the dry ice nozzle is improved to 100 percent from 76 percent before improvement. The wall body of the nozzle is provided with a plurality of silencing micropores, so that low-frequency noise is reduced and converted into high-frequency noise, and the harm of large low-frequency and medium-frequency noise to people is avoided, and the aim of reducing the noise in the injection process of the nozzle is fulfilled.

Description

Low-noise and quick-cleaning dry ice nozzle and dry ice spraying cleaning machine

Technical Field

The utility model relates to a spray and wash technical field, especially relate to a low noise, quick clear dry ice nozzle and have dry ice spray cleaning machine of this dry ice nozzle.

Background

In the preparation of the water tank of the air energy water heater, polyurethane is preferably used as a heat insulation filling layer. The polyurethane is prepared by the reaction of isocyanate ions and active hydrogen ions, and is a low-temperature-conductivity high-molecular material with excellent performance. Because the volume of the material is expanded continuously in the foaming process, the polyurethane foam is easy to overflow from the gaps of the water tank shell of the water heater and the upper cover plate and the lower cover plate. And the isocyanato ions contain polar groups, the reactivity is particularly high, the isocyanato ions are usually excessive in the preparation process, overflowing foams are easily adhered to the surface of a shell, the appearance is influenced, and the cleaning is difficult. The existing cleaning mode for cleaning stains and residual polyurethane foam on the surface of a water heater in the industry mainly achieves the aim by soaking in alcohol, scraping with a blade, wiping with rag and cleaning with toothpaste. The manual cleaning method has high labor intensity, incomplete cleaning and easy scratching of the surface of the water tank of the water heater. Therefore, a cleaning technology is urgently needed to quickly clean the residual polyurethane foam on the surface of the water tank of the water heater.

At present, the industry usually selects dry ice cleaning technology to clean residual polyurethane foam on the surface of the water tank of the water heater. The dry ice cleaning is also called cold spraying, compressed air is used as a carrier, dry ice particles are used as accelerating particles, and the dry ice particles are sprayed to the surface of an object to be cleaned by using a special dry ice spraying cleaning machine, so that dirt, oil dirt, residual impurities and the like on the surface of the object to be cleaned are rapidly frozen, and are condensed, embrittled and peeled off, and simultaneously, the dirt, the oil dirt, the residual impurities and the like are removed along with air flow. The dry ice nozzle is the most central part of the dry ice jet cleaning machine and directly influences the jet cleaning effect. However, as shown in fig. 6, in the dry ice nozzle 01 currently used in the industry, the nozzle outlet is mainly cylindrical 03, and the dry ice particles ejected from the dry ice nozzle with such a structure are distributed in a belt shape 08 with parallel sides, so that the dry ice particles have high flow rate, small coverage area, low cleaning efficiency, poor cleaning effect, and are likely to damage the workpiece. In addition, the existing dry ice nozzle generates large noise in the cleaning process, and the psychological health of people is seriously harmed.

Therefore, how to overcome the defects that the existing dry ice nozzle is low in cleaning efficiency, poor in cleaning effect and easy to damage; the defect that the noise is high during cleaning and the psychological health of people is harmed is a problem to be solved urgently in the industry.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems of low cleaning efficiency, poor cleaning effect and easy damage of the existing dry ice nozzle; secondly the noise is big when the dry ice nozzle is clean, endangers people's mental health's technical problem, provides one kind and can guarantee part surface quality, can clear up the low noise dry ice nozzle of this part surface dirt, grease and residual impurity again fast, still provides a dry ice jet cleaning machine who has this dry ice nozzle.

The utility model provides a pair of dry ice nozzle, including the nozzle cylinder, the one end of this nozzle cylinder is equipped with the connecting hole, a serial communication port, the other end of nozzle cylinder is equipped with the flat taper hole of rectangle, the main aspects of the flat taper hole of this rectangle outwards and the tip through an air flue with the connecting hole intercommunication, the sectional area of air flue is less than the sectional area of connecting hole and the flat taper hole tip of rectangle.

Preferably, the rectangular flat taper hole is a regular rectangular flat taper hole, two opposite side surfaces of the regular rectangular flat taper hole are inclined surfaces, and the other two opposite side surfaces are parallel surfaces.

Preferably, the axial length of the air passage is greater than the sum of the axial length of the rectangular flat conical hole and the axial length of the connecting hole.

Preferably, the nozzle cylinder is provided with a silencing micropore communicated with the air passage.

Preferably, the diameter of the silencing micropores is 0.2mm, and the hole center distance between adjacent silencing micropores is 2 mm.

Preferably, the connecting hole is a hexagon socket.

Preferably, the excircle wall body of interior hexagonal hole is gone up the symmetry and is equipped with two screw holes that communicate this interior hexagonal hole.

Preferably, the hexagonal socket is in transitional communication with the air passage through a conical hole.

Preferably, the axial total length of the nozzle cylinder is 219mm, the axial length of the rectangular flat conical hole is 40mm, the axial length of the air passage is 134mm, the axial length of the conical hole is 13mm, and the axial length of the connecting hole is 32 mm.

Preferably, the air flue is a circular air flue with the diameter of 12mm, axial projections of four side surfaces of the rectangular flat conical hole are just tangent to the excircle of the circular air flue, and the long edge of the rectangular flat conical hole rectangular outlet is 18.7 mm.

The utility model also provides a dry ice sprays cleaning machine, including the spray gun, the export of this spray gun with the connecting hole fixed connection of dry ice nozzle.

The utility model provides a dry ice nozzle of new-type structure mainly can be used to the cleanness of water heater water tank surface adhesion polyurethane foam. This dry ice nozzle adopts stainless steel, and the nozzle spout shape design is the flat taper hole of rectangle to through longer circular air flue and input hole intercommunication, make the spray angle of the dry ice grain that the nozzle sprays and goes out wider, spray coverage is bigger, is difficult for damaging the workpiece surface. Meanwhile, the Fluent fluid simulation software is used for simulating the movement of the dry ice particles in the nozzle flow field, and the best nozzle structure is simulated by combining the actual air pressure used by the dry ice jet cleaning machine and the production of the water heater. By using the dry ice cleaning equipment with the dry ice nozzle, the one-time cleaning qualification rate of the flash of the water tank is improved to 100 percent from 76 percent before improvement. In order to reduce the noise generated during the spraying process, a plurality of small holes with the hole diameter of 0.2mm are arranged on the wall body of the nozzle, wherein the distance between the centers of the holes is 2 mm. The noise frequency radiated from the micropore is transferred from the low frequency band to the high frequency band, so that the low frequency noise is reduced, the high frequency noise is increased, and people can only hear the sound of the middle and low frequency bands, thereby achieving the purpose of reducing the noise in the injection process of the nozzle.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of a dry ice nozzle of the present invention;

figure 2 is a front view of an embodiment of the dry ice nozzle of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a left side view of FIG. 2;

FIG. 5 is a right side view of FIG. 2;

FIG. 6 is a schematic diagram of a distribution of the prior art dry ice nozzle formed by the blasting of dry ice pellets;

fig. 7 is a schematic diagram of the distribution state of the dry ice pellets sprayed from the dry ice nozzle of the present invention.

Wherein: 01-existing dry ice nozzle, 03-nozzle outlet of existing dry ice nozzle, 08-distribution state formed by spraying existing dry ice particles; 1-nozzle column body, 2-connecting hole, 3-rectangular flat conical hole, 4-silencing micropore, 5-threaded hole, 6-conical hole, 7-circular air channel and 8-dry ice particle spraying.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

As shown in fig. 1-5, the utility model provides a pair of dry ice nozzle's embodiment, it includes circular nozzle cylinder 1 of stainless steel, and the left end of this nozzle cylinder 1 is equipped with hexagon socket's connecting hole 2, and the right-hand member of nozzle cylinder 1 is equipped with the flat taper hole of rectangle 3, and the main aspects of this flat taper hole of rectangle 3 outwards and the tip of the flat taper hole of rectangle 3 communicates with connecting hole 2 through a circular air flue 7. As shown in fig. 3 and fig. 5, the left and right side surfaces of the rectangular flat conical hole 3 are inclined surfaces inclined toward the center of the hole, and the upper and lower side surfaces are parallel surfaces, that is, the cross section of the vertical axis of the rectangular flat conical hole 3 is a regular rectangle, and the cross sections at different positions are different in size. The axial projections of the left side, the right side, the upper side and the lower side of the rectangular flat conical hole 3 are just tangent to the excircle of the circular air passage 7. And the cross-sectional area of the circular air passage 7 perpendicular to the axis is smaller than the cross-sectional area of the connecting hole 2 and smaller than the cross-sectional area of the small end of the rectangular flat conical hole 3. The utility model discloses preferred embodiment, circular air flue 7's axial length is greater than 3 axial length in the flat taper hole of rectangle with the axial length sum of connecting hole 2. The axial length of the circular air duct 7 can also be set as desired. In addition, the nozzle column body 1 is provided with a silencing micropore 4 communicated with the circular air passage 7. The diameter of the silencing micropores 4 is 0.2mm, and the hole center distance between adjacent micropores is 2 mm. Two threaded holes 5 communicated with the hexagon socket holes 2 are symmetrically arranged on the outer circle wall body of the hexagon socket connecting hole 2. In the embodiment, the hexagon socket 2 is in transitional communication with the circular air passage 7 through a conical hole 6.

The utility model also provides a dry ice sprays cleaning machine, including the spray gun, air compressor and dry ice grain preparation machine, the export of this spray gun is inserted the utility model discloses a connecting hole 2 of dry ice nozzle to carry out screw thread fixed connection by a pair of screw hole 5.

The utility model provides a dry ice nozzle structure can use the dry ice granule about 0.5 mm. After the machine is started, the mixture of the dry ice particles and the compressed air firstly enters the cavity of the inner hexagonal connecting hole 2 at the front end of the spray gun from the outlet of the spray gun. The dry ice particles are high in moving speed, more dry ice particles can be contained in the connecting hole 2 of the hexahedral structure, then the dry ice particles moving at high speed enter the strip-shaped circular air passage 7, and the sectional area of the circular air passage is completely smaller than that of the connecting hole 2, so that the moving channel of the dry ice particles moving at high speed is compressed after the dry ice particles enter the circular air passage 7, the moving speed of the dry ice particles is accelerated again, and the flow rate of the dry ice particles can be further improved along with the proper extension of the circular air passage 7.

Thereby when guaranteeing to get into rectangle flat cone hole 3, the dry ice grain has higher injection speed, because rectangle flat cone hole 3 is the oblate cone structure, its sectional area also is greater than the sectional area of circular air flue 7, then can lead to the speed of the dry ice grain that gets into rectangle flat cone hole 3 to reduce to prevent that dry ice grain outlet velocity is too high and to the work piece that needs the clearance, for example, the water tank surface causes the damage. As shown in fig. 7, since the dry ice nozzle provided by the present invention is a rectangular flat conical hole 3 structure, and the axial cross-sectional shape thereof is rectangular, compared with the conventional cylindrical nozzle (as shown in fig. 6), the dry ice nozzle has a larger spraying angle and a wider range, and the distribution state 8 formed by spraying the dry ice particles in fig. 7 is a radial shape, and the speed of spraying the dry ice particles is moderate. Because the type, the length and the diameter of the nozzle outlet can directly influence the spray cleaning efficiency, the optimal nozzle length and the nozzle outlet diameter are designed by simulating the velocity distribution of a gas-phase flow field of the nozzle and the track distribution of dry ice particles in the nozzle by using Fluent fluid simulation software and combining the commonly used actual air pressure of-0.5-0.8 Mpa and the production of a water heater. The preferable structure can be as follows: the axial total length of the nozzle cylinder 1 is 219mm, the axial length of the rectangular flat conical hole 3 is 40mm, the axial length of the circular air passage 7 is 134mm, the axial length of the conical hole 6 is 13mm, and the axial length of the connecting hole 2 is 32 mm. The diameter of the circular air passage 7 is 12mm, and the long sides of the rectangular outlets of the rectangular flat conical holes 3 are respectively 18.7 mm. That is, the inclination angles of the left and right inclined planes of the rectangular flat conical hole 3 are actually limited according to the side lengths of the two ends of the rectangular flat conical hole 3 and the axial length of the rectangular flat conical hole 3. In order to reduce the noise generated during the cleaning of the dry ice nozzle, sound-attenuating micro-holes 4 with a size of 0.2mm were drilled in the stainless steel surface, wherein the hole center distance between each hole was 2 mm. Because the noise frequency radiated from the outlet of the silencing micropore 4 is transferred from the low-frequency band to the high-frequency band, namely the low-frequency noise is reduced, the high-frequency noise is increased, and people can only hear the sound of the middle and low frequency bands, the purpose of reducing the noise is achieved.

The above description is only an embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a low noise, quick clear dry ice nozzle, includes the nozzle cylinder, and the one end of this nozzle cylinder is equipped with the connecting hole, its characterized in that, the other end of nozzle cylinder is equipped with the flat taper hole of rectangle, the main aspects of this flat taper hole of rectangle outwards and the tip through an air flue with the connecting hole intercommunication, the sectional area of air flue is less than the sectional area of connecting hole and the sectional area of the flat taper hole tip of rectangle.

2. A dry ice nozzle as claimed in claim 1, wherein the rectangular shaped bore is a right rectangular shaped bore having two opposing sides that are beveled and two opposing sides that are parallel.

3. A dry ice nozzle as defined in claim 1, wherein an axial length of the air passageway is greater than a sum of an axial length of the rectangular flat tapered bore and an axial length of the connection bore.

4. A dry ice nozzle as defined in claim 1, wherein the nozzle post is provided with sound attenuating micro-holes communicating with the air passageway.

5. A dry ice nozzle as claimed in claim 4, wherein the diameter of the sound attenuating micro holes is 0.2mm and the hole center distance between adjacent sound attenuating micro holes is 2 mm.

6. A dry ice nozzle as defined in claim 1, wherein the connecting hole is a hexagonal socket.

7. A dry ice nozzle as claimed in claim 6, wherein the outer cylindrical wall of the socket has two threaded holes symmetrically disposed therein that communicate with the socket.

8. A dry ice nozzle as defined in claim 6, wherein the hexagonal socket is in transitional communication with the air passageway through a conical bore.

9. A dry ice nozzle as claimed in claim 1, wherein the nozzle barrel has a total axial length of 219mm, the rectangular flat conical bore has an axial length of 40mm, the air passage has an axial length of 134mm, the conical bore has an axial length of 13mm, and the connecting bore has an axial length of 32 mm.

10. A dry ice nozzle as claimed in claim 9, wherein the air passage is a circular air passage with a diameter of 12mm, the axial projections of the four sides of the rectangular flat-tapered hole are exactly tangential to the outer circle of the circular air passage, and the long side of the rectangular flat-tapered hole rectangular outlet is 18.7 mm.

11. A dry ice blast cleaning machine comprising a lance, wherein an outlet of the lance is fixedly connected to a connection hole of a dry ice blast nozzle according to any one of claims 1 to 10.