JPH06213590A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To provide a plate type heat exchanger in which a stopper is not welded to a fixed frame and a co-turning of a fastening bolt during a fastening of a fastening nut can be positively prevented. CONSTITUTION:A moving frame 5 is movably and axially suspended at guide bars 3, 4 bridged between an opposed fixed frame 1 and a supporting leg 2. Both end edges in a width direction of the fixed frame and the moving frame are oppositely formed with recesses 16 at a constant pitch in which a plurality of laminated heat transfer plates 8 are cooperatively fastened with fastening nuts 11 through a gasket 9 and some fastening bolts 10 can be fitted under its horizontal attitude. An outer circumferential edge of the recess of one frame of both frames is forked with a recess part 32 to which a head part 18 of each of the fastening bolts can be fitted and engaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate type heat exchanger, and more specifically, a tightening bolt generated when a plurality of heat transfer plates laminated between a fixed frame and a moving frame are fixed by tightening. The present invention relates to a plate heat exchanger capable of preventing the co-rotation phenomenon of the above.

[0002]

2. Description of the Related Art Generally, as shown in FIGS. 3 and 4, a plate heat exchanger has upper and lower guide bars (3) (4) bridged between a fixed frame (1) and supporting legs (2). )
The moving frame (5) is suspended and supported so as to be movable in the axial direction, and medium passage holes (7) are provided at four corners of the heat transfer surface (6) between the fixed frame (1) and the moving frame (5). A plurality of rectangular heat transfer plates (8) provided are alternately turned upside down via a gasket (9) to be laminated, and tightened with a tightening bolt (10) and a tightening nut (11), A first flow path (12) and a second flow path (1
3) and 3 are alternately formed.

By the way, conventionally, each tightening bolt (10)
Are formed in the end faces (1a) (5a) on both side edges in the width direction of the fixed frame (1) and the movable frame (5) at a constant pitch axially facing each other and with a downward slope inward. The cutouts (16) and (17) are fitted in a parallel posture. Then, the tightening nut (11) is screwed and tightened on the tip of each tightening bolt (10), and the head (18) and the tightening nut (11) of each tightening bolt (10) are The outer peripheral surfaces of the notches (16) and (17) of the frames (1) and (2) are brought into contact with each other.

However, when the tightening nut (11) is tightened, the rotating force of the tightening nut (11) is larger than the frictional force between the head (18) of the tightening bolt (10) and the fixed frame (1). Then, the tightening bolt (10) becomes the tightening nut (1
1) and the tightening nut (11) cannot be securely tightened, which causes a problem that the head (18) of the tightening bolt (10) is fixed with a spanner. If it is necessary to tighten (11) and the tightening bolt (10) is long, the tightening bolt (10)
Two workers are required, one for fixing the head (18) of the head with a wrench and the other for tightening the tightening nut (11).

Therefore, conventionally, a stopper as shown in FIGS. 5 and 6 has been welded and fixed to the outer peripheral surface of the cutout portion (16) of the fixed frame (1). The stopper (21) shown in FIG. 5 has a head (1) of the tightening bolt (10) on the inner peripheral edge.
The outer peripheral edge of 8) can be fitted, and the outer peripheral end faces (18a) (18b) (18c) (18d) (18) of the head (18) can be fitted.
e) Locking surfaces (22a) (22) with which (18f) can abut
b) (22c) (22d) (22e) (22f) is formed in a substantially U shape, and the fixed frame (1)
It is welded and fixed to the outer peripheral surface of the notch (16). Further, the stoppers (23) (23) shown in FIG. 6 are plate-shaped, and are located at point symmetrical positions on the periphery of the notch (16) of the fixed frame (1) at the heads of the tightening bolts (10). The outer peripheral surfaces (18b) and (18e) of (18) are welded and fixed so as to come into contact with each other. Then, the head portion (18) of the tightening bolt (10) is engaged with the stopper (21) or (23) (23) to tighten the tightening bolt (1) when tightening the tightening nut (11).
0) was prevented from rotating together with the tightening nut (11).

[0006]

According to the conventional plate heat exchanger, in order to prevent the tightening bolt (10) from rotating together when the tightening nut (11) is tightened, the fixed frame (1) is prevented. The stopper (2
Since 1) or (23) and (23) must be fixed by welding, a separate stopper component is required, the number of components is increased, and a processing machine for producing the stopper component is required, resulting in a production cost. Get higher Further, a welding process for welding and fixing the stopper (21) or (23) (23) to the fixed frame (1) is required, and further, the stopper (21) or (23) (23) is fixed to the fixed frame (1). In order to accurately position and weld the fixed frame (1), the fixed frame (1) is conveyed and moved to the welding process and held in a horizontal posture, and then the stopper (21) or (2
3) Since it is necessary to accurately position (23) using a positioning jig or the like, a great deal of labor and labor is required by the operator, and there is a problem that workability is extremely poor.

The present invention has been proposed in view of the above problems, and when the tightening nut is tightened, the tightening bolt rotates together with the tightening nut without welding the stopper to the fixed frame. It is an object of the present invention to provide a plate heat exchanger capable of reliably preventing the above.

[0008]

In order to achieve the above-mentioned object, the present invention suspends and supports a movable frame in an axially movable manner on a guide bar bridged between a fixed frame and a support leg that face each other. In addition, parallel to the widthwise end edges of the fixed frame and the moving frame, tightening bolts that fix the heat transfer plates stacked with gaskets between the frames in cooperation with the tightening nuts are fixed. In a plate heat exchanger in which notches that can be fitted in various postures are formed facing each other at a constant pitch, the head of a tightening bolt is fitted to the outer peripheral surface of the notch of one of the two frames. This is a recess that can be stopped.

[0009]

When the heat transfer plate laminated between the fixed frame and the moving frame is tightened and fixed, after the tightening bolts are fitted into the notches of both frames, the heads of the tightening bolts are fixed, for example. The frame is fitted into a recess formed on the outer peripheral surface of the peripheral edge of the notch, and then a tightening nut is screwed and tightened on the tip of the tightening bolt. Then, since the head of the tightening bolt is fitted and locked in the co-rotation preventing recess of the fixed frame, it is possible to prevent the co-rotating of the tightening bolt when tightening the tightening bolt.

[0010]

Embodiments of the plate heat exchanger according to the present invention will be described below with reference to FIGS. 1 and 2. The same parts as those shown in FIGS. 3 to 6 are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 1 and 2, the feature of this embodiment is that the outer surface (31) of the peripheral edge of the notch (16) formed on both lateral edges of the fixed frame (1) is tightened. A recess (32) for preventing co-rotation having a predetermined shape into which the head (18) of the bolt (10) can be fitted is cut out, and the recess (3) is formed.
The outer peripheral end surface (18a) (1) of the head (18) (1
8c) (18e) can be locked by the locking surface (33a) (33
c) (33e) is formed. The locking surfaces (33a) (33c) (3) of the recess (32) for preventing the co-rotation.
3d) is formed on three sides forming an equilateral triangle, and the tightening bolt (10) is formed in the co-rotation preventing recess (32).
When the outer peripheral edge (34) of the head (18) is fitted, the outer peripheral end surfaces (18a) (18c) (18e) of the head (18)
Engage with the locking surfaces (33a) (33c) (33e) located outside the co-rotation preventing recess (32), and the tightening bolt (10) engages the notch (16) of the fixed frame (1). ) Is prevented. The co-rotation preventing recess (32) formed in the fixed frame (1) is formed by an appropriate processing machine at the same time when the medium passage hole formed in the fixed frame (1) is processed, and the depth thereof is increased. L may be determined by the size of the tightening bolt (10) and is usually 3
If it is set to mm or more, the rotation preventing effect can be sufficiently exerted.

When tightening a plurality of heat transfer plates (8) which are laminated and interposed between the fixed frame (1) and the movable frame (5), the cutouts of the two frames (1) and (5) facing each other are tightened. Tightening bolts (1) on the parts (16) and (17) respectively
0) is fitted horizontally and the outer peripheral edge (3
4) is fitted into a recess (32) for preventing co-rotation formed on the outer peripheral surface (31) of the cutout portion (16) of the fixed frame (1), and the outer peripheral end surface (18a) of the head (18) ( 18c)
(18e) is engaged with each locking surface (33a) (33c) (33e) of the recess (32) for co-rotation prevention. Therefore, in this state, when the tightening nut (11) is screwed onto the tip of the tightening bolt (10) and tightened, the outer peripheral end surface (18a) (18a) of the head (18) of the tightening bolt (10) ( 18
c) (18e) is engaged with the locking surfaces (33a) (33c) (33e) of the recess (32) for preventing co-rotation,
The tightening bolt (10) is prevented from rotating together with the tightening nut (11), and the head portion (18) of the tightening bolt (10) can be positioned and held at a constant position at all times. The tightening bolt (10) is prevented from protruding from the notches (16) and (17) of the fixed frame (1).

[0013]

According to the present invention, since a co-rotation-preventing concave portion with which the head portion of the tightening bolt is fitted and locked is formed on the outer peripheral surface of the notch portion of the frame, the concave portion can be utilized. When tightening the heat transfer plate, it is possible to reliably prevent the tightening bolt from rotating together with the tightening nut. In addition, the conventional stopper parts are not required, the production cost is reduced, the welding process can be eliminated, the welding device and the stopper processing device are unnecessary, and the fixed frame is transported for welding work. There is no need to move it, the labor and labor of the operator is greatly reduced, and the workability is greatly improved.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a fixed frame according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of FIG.

FIG. 3 is an overall perspective view showing an example of a conventional plate heat exchanger.

FIG. 4 is an exploded schematic perspective view of a main part of FIG.

FIG. 5 is a front view of a main part of a fixed frame provided with a first co-rotation preventing structure for a tightening bolt in a conventional plate heat exchanger.

FIG. 6 is a front view of a main portion of a fixed frame provided with a second co-rotation preventing structure for a tightening bolt in a conventional plate heat exchanger.

[Explanation of symbols]

 1 Fixed Frame 2 Support Legs 3, 4 Guide Bar 5 Moving Frame 8 Heat Transfer Plate 9 Gasket 10 Tightening Bolt 11 Tightening Nut 16, 17 Notch 18 Head 31 Outer Side 32 Recess

Claims (1)

[Claims] 1. A guide bar bridged between a fixed frame and a support leg facing each other suspends and supports a movable frame in an axially movable manner, and at both end edges in the width direction of the fixed frame and the movable frame. , Notches that can be fitted in parallel with the tightening bolts that fix the multiple heat transfer plates stacked with gaskets between the frames with the tightening nut in cooperation with the tightening nuts are formed facing each other at a constant pitch. In the plate heat exchanger, a plate heat exchanger is characterized in that a concave portion into which the head of the tightening bolt can be fitted and locked is formed on the outer peripheral surface of the cutout portion of one of the two frames. Exchanger.