CN1408936A

CN1408936A - Drying loop of dry washing machine using n-propyl bromide solvent

Info

Publication number: CN1408936A
Application number: CN02144001.8A
Authority: CN
Inventors: S·卡诺韦尔
Original assignee: SUDIPO SpA
Current assignee: SUDIPO SpA
Priority date: 2001-10-03
Filing date: 2002-09-29
Publication date: 2003-04-09
Also published as: JP2003144796A; US20030061844A1; ITBO20010605A1; EP1300501A1

Abstract

A drying circuit for dry-cleaning machines using n-propyl bromide solvent, consisting of the fact that the coil of a refrigeration unit is immersed in the primary solvent tank. At top ends thereof the tank is connected to the drum with pipes for the passage of the drying air, the free surface of the solvent in the tank constituting a cooling agent for the air.

Description

Adopt the oven dry loop of the dry cleaner of n-pro-pyl bromination thing solvent

Technical field

The present invention relates to adopt the oven dry loop of the dry cleaner of n-pro-pyl bromination thing solvent.

Background technology

In the dry-cleaning industry, be devoted to the most widely used solvent for a long time, i.e. the research of perchloroethylene alternative aspect.

This solvent is introduced into the dry-cleaning industry from mid-term nineteen sixties, and effective characteristic has hereafter monopolized the whole market because it is tall and erect.Yet, to the toxicology aspect of perchloroethylene studies have shown that this solvent has high toxicity, particularly can pollute underground water.

Though do not ban use of this solvent, owing to will buy expensive machine and will satisfy the requirement of very fine and loaded down with trivial details safety standard, thereby in fact do not use this solvent.

The dry-cleaning industry has been advised substituted type machine and solvent, for example varsol again.

These solvents can satisfy the requirement of environment aspect fully, in some cases or even can be biodegradable.Yet they still have following defective:

--they are flammable, thereby make machine must satisfy very special safety standard;

--their ability of cleaning greasy dirt is very limited, thereby must adopt the washing hardening agent (washing reinforcer) of quite a lot of quantity;

--the evaporation rate of these solvents is higher relatively, therefore, compares with perchloroethylene type dry cleaner, and required drying time is much longer;

--in order to limit drying time, advantageously adopt at a high speed and rotate dehumidification, so just have to introduce vibration tube technology, thereby raise the cost;

--distillation needs vacuum technique, thereby further raises the cost.

Therefore, in practice,, can introduce other various less important problems, for example cost of Ben Zhi security and dry cleaner in order to solve a problem.

Here it is adopts the cause and effect of n-pro-pyl bromination thing solvent (for example 2 that introduce to the market by Comeco, registration mark is Comexol One).This kind solvent has the following advantages:

--although can't realize complete biodegradable as varsol, its toxicity is lower than perchloroethylene;

--danger: can not damage the ozone layer at least;

--combustibility: do not have;

--have very high ability of cleaning greasy dirt, even exceed perchloroethylene; Thereby only need limited hardening agent, can shorten wash time usually;

--evaporation rate: be lower than perchloroethylene; Because this characteristic can significantly shorten drying time.

Boiling point relatively low (69 ℃, as a comparison, perchloroethylene is 121 ℃, hydro carbons is 190-200 ℃).So,, thereby can simplify the design of heat exchanger because it is lower to add the operating pressure of hot fluid.

The unique defective of this solvent is its steam pressure, a little more than perchloroethylene (110 millimetress of mercury are to 14 millimetress of mercury).

Under general case, the dry cleaner of working with this solvent is under a kind of medium operating pressure.

Summary of the invention

Target of the present invention is, a kind of oven dry loop of adopting the dry cleaner of n-pro-pyl bromination thing solvent is provided, and wherein the steam pressure of solvent is insignificant numerical value.Consider that steam pressure is the very low order of magnitude, when the steam in the Drying tunnel thinned out thereby makes lowering of concentration, particularly when baking step finished, solvent may be difficult to condense.

In this target zone, one object of the present invention is, provide be convenient to relatively in a kind of simple, practice that provide, safe in utilization, operation is efficient and have the structure of relatively low cost.

Target of these and other and purpose will become clear by following description, the invention provides a kind of oven dry loop of adopting the dry cleaner of n-pro-pyl bromination thing solvent, it is characterized in that, the coil pipe of one refrigerating plant is immersed in the main solvent case, described main solvent case is connected in tube at its top by pipe, pass through for the oven dry air, the Free Surface of the solvent in the described solvent tank has constituted the cooling agent of using for air.

Brief Description Of Drawings

Further characteristic of the present invention and advantage will become clearer by following description.Following description is but that the embodiment at the oven dry loop of a preferable not exclusive dry cleaner according to employing n-pro-pyl bromination thing solvent of the present invention carries out, and only is that limiting examples in is in conjunction with the accompanying drawings carried out.In the accompanying drawing:

Fig. 1 is the schematic diagram according to the oven dry loop of the dry cleaner of employing n-pro-pyl bromination thing solvent of the present invention;

Fig. 2 is the schematic diagram of a kind of version in loop shown in Figure 1.

The specific embodiment

Referring to each accompanying drawing, label 1a, 1b always represent the oven dry loop according to the dry cleaner of employing n-pro-pyl bromination thing solvent of the present invention.

In the accompanying drawings, each member of representing dry cleaner with following label: cylindric washer 2, lint filter 3, fan 4, heater 5, condenser 6, tube inlet duct 7, tube outlet conduit 8, middle or main solvent case 9, available secondary solvent case 10a and 10b.

The coil pipe 11 of refrigerating plant (for example can be the coil pipe that is used for the dry cleaner of baking step) is immersed in solvent tank 9, and solvent tank 9 is connected in cylindric washer at its top by pipe, passes through for the oven dry air.

Loop 1a according to the present invention as shown in Figure 1 is used for forming the pipe 12 that connects particularly including one between the suction inlet of solvent tank 9 and fan 4, and the pipe 13 that is used to return solvent tank, the latter is arranged to direct downstream from heater 5 and is connected to main solvent case 9.

Loop 1b according to the present invention as shown in Figure 2 has one and is used between fan Transmission Part and solvent tank 9 forming the pipe 14 that connects, and a pipe 15 of a downstream area that is used for being back to from solvent tank the heater 5 of Drying tunnel.

Can

valve

16,17,18,19 be installed respectively along

pipe

12,13,14 and 15, for optimizing the purpose of operation, these valves have different period of activation.

Solvent in the solvent tank 9 solvent pressure of (0-20 ℃) under low temperature condition can cause steam pressure to remain on low-down numerical value, for example the evaporation of solvent is restricted to actual low-down level.

Because the solvent tank 10a and the 10b of side contact with the solvent tank 9 that is cooled by metallic walls, thereby they also can be cooled, and see it obviously is favourable from the angle that limits steam pressure.

Secondly, in fact the two-tube air flow (having saturated condensing solvent) of discharging from cylindric washer that can make that oven dry tunnel, loop is connected in solvent tank is divided into two parts, major part enters the dry cleaner condenser, sub section is drawn towards chilled or cold solvent case 9, therefore, the cold solvent case can serve as additional condenser.

Therefore, the present invention who is disclosed can realize its target and purpose.

Conceive the present invention who forms like this and be easy to various modification, all these modification all should fall into the scope of appended claims.

All details can replace with other technical equivalent.

In the practice, used material and shape and size can change as required, the protection domain of appended each claim of this unlikely influence.

Claims

1. oven dry loop of adopting the dry cleaner of n-pro-pyl bromination thing solvent, it is characterized in that, the coil pipe of one refrigerating plant (11) is immersed in the main solvent case (9), described main solvent case (9) is connected in tube (2) at its top by pipe (12,13,14,15), pass through for the oven dry air, the Free Surface of the solvent in the described solvent tank (9) has constituted the cooling agent of using for air.

2. loop as claimed in claim 1, it is characterized in that, it comprises that one is arranged in the tube connector (12) between the suction inlet of described solvent tank (9) and fan (4), and a pipe (13) that is used to return solvent tank (9), the latter directly is connected to described main solvent case (9) from the downstream of heater (5).

3. loop as claimed in claim 1, it is characterized in that, it comprises that one is arranged in the Transmission Part of fan (4) and the tube connector (14) between the solvent tank (9), and a pipe (15) that is used to return connection, the latter is arranged in solvent tank (9) and is positioned between the zone in heater (5) downstream in oven dry loop.

4. one or the described loop of omnibus claims as described above, it is characterized in that, one or more valves (16,17,18,19) of having equipped in the described pipe (12,13,14,15), these valves have the different period of activation that is suitable for making optimized operation.