JPH0545450Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to the improvement of batch-type heating devices, and more specifically to the improvement of vulcanization cans for rubber products such as V-belts and waterproof sheets. This invention relates to an improvement in the drain discharge mechanism of a batch heating device that intermittently injects and discharges steam into a heating can.

(Prior art) As shown in FIG. 2, the batch type heating device basically includes a heating can 1, a steam supply pipe 2 that supplies steam to the heating can 1, and a product removal from the heating section 1. It is composed of a steam exhaust pipe 3 for exhausting steam when setting objects to be heated and for exhausting drain.

Steam is supplied to and discharged from the heating can by automatic valves 4 and 5 provided in the steam supply pipe 2 and steam exhaust pipe 3, respectively, and the drain generated in the heating can is removed by the automatic valve 5. This is done by steam traps 6 installed in parallel.

(Problem that the invention aims to solve) By the way, the original function of the steam trap used in conventional heating equipment is to separate steam and condensate using floats, etc., and to discharge only the condensate. However, as a practical matter, it is difficult to completely prevent steam leakage, and because the on-off valve is operated with steam pressure, it is theoretically possible for steam to leak by 2 to 3%. is also inevitable.

Furthermore, since the steam trap is constantly exposed to high temperature and pressure, its moving parts, which have precise mechanisms, are susceptible to deformation, making it difficult to maintain their initial performance.

In particular, with batch-type heating devices, the temperature inside the heating can changes each time the heated material is put in and taken out, and the drain discharge valve of the steam trap opens and closes violently each time, so its performance tends to deteriorate early. Leakage often occurs, and from the perspective of reducing energy consumption, it has been desired to improve the drain discharge mechanism of batch-type heating devices.

The present invention focuses on the drawbacks of the conventional technology, and uses a batch-type heating device with less steam leakage.
Another object of the present invention is to provide a heating device having a drain discharge mechanism that is easy to maintain against steam leakage and has little change over time.

(Means for Solving the Problems) Therefore, the feature of the present invention for achieving the above-mentioned object is that in a batch type heating device equipped with a steam supply pipe and a steam exhaust pipe, a shutoff valve is installed at the lowest part of the heating can. The heating device includes a drain tank provided through the drain tank, and a drain discharge valve connected to the end of the drain tank.

(Example) Specific examples of the present invention will be further described below.

FIG. 1 is a piping system diagram of a heating device according to a specific embodiment of the present invention.

7 in Figure 1 is one of the components of the batch type heating device.
It is a heating can, after putting an object to be heated such as unvulcanized rubber inside, sealing the inside, injecting steam to heat the object, and then opening the lid after expelling the steam inside. It is used for taking out objects to be heated.

The heating device according to the embodiment of the present invention includes a heating can 7, a steam supply pipe 10 connecting the steam source 8 and the heating can 7 via a supply valve 9 consisting of an automatic valve such as a solenoid valve or an actuator valve, and a bottom of the heating can 7. An exhaust pipe 12 having an exhaust valve 11 consisting of an automatic valve, and an exhaust pipe 12 which is branched from the exhaust valve 11 of the exhaust pipe 12 and the piping of the heating device 7 and installed at a lower position than the lowest part of the heating can 7. It consists of a drain tank 13.

The above-mentioned drain tank 13 has a shutoff valve 14 made of an automatic valve at the connection part (downstream part from the branch part), and has a drain discharge valve 15 also made of an automatic valve at the lowest part, and is supplied with air from an air supply source 16. A pressurizing pipe 18 is connected via a pressure valve 17 .

The operation of each part of the heating device of this embodiment will be explained in order. During heating work, the supply valve 9 and the cutoff valve 14 are opened, and the exhaust valve 17 and the drain discharge valve 15 are closed. By doing so, the drain generated during the heating operation flows to the bottom by gravity and is stored in the drain tank 13, so that only steam can be maintained in the heating can 7 at all times. When the heating is completed, the supply valve 9 shutoff valve 14 is closed, the exhaust valve 11 is opened, and the steam in the heating device 7 is discharged from the steam exhaust pipe 12, and at the same time, the drain discharge valve 15 at the lowest part of the drain tank 13 is opened. , the pressurizing valve 17 is opened to supply pressurized air from the pressurizing pipe 18, pressurizing the inside of the drain tank 13, and draining the drain inside the drain tank 13 from the discharge valve 15.

Further, by disposing the cutoff valve 14 between the heating can 7 and the drain tank 13, the drain accumulated in the drain tank can be discharged even during the heating operation. During heating work, the supply valve 11 and the cutoff valve 14 are normally open, but when a certain amount of drain has accumulated in the drain tank 13, the cutoff valve 14 is closed and the drain valve 15 of the drain tank 13 is closed.
can be opened to drain the drain. In this way, when the shutoff valve 14 is closed, the heating can 7 and the drain tank 13 are completely shut off, and the heating can 7
Condensate can be discharged even while steam is being supplied to the heating can 7, and steam in the heating can 7 will not leak due to discharge of the condensate.

In the above-mentioned embodiment, a structure in which the drain tank has a shutoff valve and pressurizing piping is used, and the drain is discharged by pressurizing air. It is also possible to discharge the drain by utilizing the steam pressure at the time of discharge, and in that case, the exhaust valve 11 and the steam exhaust pipe 12 of the previous embodiment can be replaced with the shutoff valve 14 and the drain discharge valve 15. It can be shared.

Further, drain can also be discharged simply by gravity.

(Effects) The heating device of the present invention has a structure that has a drain tank in the lowest part of the heating can to temporarily store the drain generated during heating work, so that the heating device can be kept completely sealed during heating. It is possible to separate steam from water while doing so, and prevent steam leakage during heating operations.
This can be done while the steam from the heating device is being exhausted or while the product is being taken out.

In addition, in the heating device of the present invention, a shutoff valve is placed between the heating can and the drain tank, and by closing the shutoff valve, the heating can and the drain tank can be shut off. Even while steam is being supplied, the discharge valve can be opened to discharge the condensate without escaping the steam in the heating pipe.

In addition, the heating device of the present invention has a drain discharge mechanism.
Since there are no moving parts like the float or on-off valve inside a conventional steam trap, it is mechanically strong and can maintain its initial capacity for a long time.

In addition, in the conventional piping structure, it is necessary to perform frequent maintenance of the steam traps, so two steam traps are connected in parallel.
Previously, it was necessary to use one by one by switching with a valve, or to install bypass piping, but the steam piping structure of this invention requires less maintenance than conventional steam traps, so it is especially easy to maintain. Additional piping for this purpose is unnecessary.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram of a heating device according to a specific embodiment of the present invention, and FIG. 2 is a piping system diagram of a conventional heating device. 7...Heating can, 10...Steam supply pipe, 12...
Steam exhaust pipe, 13...drain tank, 15...drain discharge valve.

Claims (1)

[Scope of utility model registration request] A heating device equipped with a steam supply pipe and a steam exhaust pipe, characterized in that a drain tank is provided at the lowest part of the heating can via a shutoff valve, and a drain discharge valve is connected to the tip of the drain tank. Device.