JPS6210624Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a seal structure for a plate heat exchanger.

Conventionally, in a plate heat exchanger, as shown in FIG.
A method is adopted in which force (compression) is applied to the plates 1 and 2 from direction b to compress the gasket 3, thereby sealing the hydraulic pressure. However, with this, the compression ratio has to be increased as the hydraulic pressure increases, which requires a great deal of force for compression and requires time for maintenance. Also, since there is no fixed support means for the gasket 3, the gasket 3 may be damaged due to pressure.
It has been difficult to increase the pressure because the gasket 3 may shift outward, and in some cases, the gasket 3 may be cut.

In view of the above-mentioned drawbacks of the conventional plate heat exchanger, the present invention makes the gasket groove a sealed structure, provides fixed support means for the gasket, and uses the pressure to press the gasket against the side wall surface of the gasket groove when the pressure is high. This provides a stronger seal structure that does not require a large tightening force.

The configuration of the present invention will be described below with reference to embodiments shown in the drawings.

2 and 3 show an embodiment in which the present invention is applied to a condenser. As shown in the drawings, in this embodiment, two heat transfer plates 4 and 5 are combined to constitute a heat transfer element 6, and a required number of heat transfer elements 6 are arranged within a frame body 7. Each heat transfer plate 4, 5 has a joining flange part 4a, 5a on the outer periphery, and is provided with a heat transfer surface 4b, 5b recessed from the joining surface inside the joining flange part 4a, 5a. A hollow heat transfer element 6 whose interior is sealed is constructed by joining the joining flange parts 4a and 5a on the outer periphery with the heating surfaces 4b and 5b facing each other. Each heat transfer element 6 is provided with an opening 8 for passage of refrigerant liquid A, and a gasket 9 is arranged around the opening 8 between adjacent heat transfer elements. This gasket 9 is made of an elastically deformable material such as rubber, which is generally used as a sealing material for this type of plate heat exchanger.
Thereby, the openings 8 of each heat transfer element 6 communicate with each other, and a communication path 10 for the refrigerant liquid A is formed. 11
is an inlet for refrigerant liquid A, and 12 is an outlet.
Steam B is introduced from the inlet 13 opened at the top of the frame 7, and passes through the steam passages 14 between the heat transfer elements 6, thereby exchanging heat with the adjacent refrigerant liquid A. It condenses on the heat transfer surface 15 and flows down. It is then collected together with the untreated vapor at the bottom of the frame and taken out from the outlet 16.

By the way, the supply pressure of refrigerant liquid A and the supply pressure of vapor B have a relationship of A>B, and gasket 9
is pushed outward and tries to deviate. Therefore, in the present invention, as shown in FIG. 3, the groove side surface 18 of the gasket groove 17 is raised to form a U-shaped groove, and a sealed structure is formed with the adjacent heat transfer element. The high pressure of the refrigerant liquid A acting on the gasket 9 from the liquid passage 10 brings the gasket 9 into pressure contact with the wall of the groove side surface 18 on the low pressure side, bringing it into closer contact and improving its sealing degree (sealing effect). This becomes more noticeable as the pressure of refrigerant liquid A increases or as the pressure difference between refrigerant liquid A and vapor B increases. Therefore, there is no need to increase the tightening force for the heat transfer plate as the pressure of the fluid used increases as in the past, and it can be assembled with a small tightening force, making it suitable as a seal at high pressures. .

In short, the present invention has the joining flange parts 4a, 5a on the outer peripheral edge, and the joining flange parts 4a, 5a are provided on the outer peripheral edge.
Heat transfer surface 4 recessed from the joint surface to the inside of a and 5b
Two heat transfer plates 4 and 5 having heat transfer surfaces 4b and 5b are used, and the outer periphery joining flanges 4a and 5a are joined with the heat transfer surfaces 4b and 5b facing each other to form a sealed hollow interior. A heat transfer element 6 that forms a heat transfer channel for a refrigerant liquid and has openings 8, 8 communicating with the heat transfer channel formed above and below the heat transfer surfaces 4b, 5b.
A large number of upper and lower communication passages are connected to the heat transfer passages of the refrigerant liquid in each heat transfer element 6 by sequentially superimposing and tightening a large number of them through annular gaskets 9, 9 that independently surround the upper and lower openings 8, 8. 10, 10, and a steam passage is formed around each heat transfer element 6 and between each heat transfer element 6 by the annular gasket 9, 9,
It is installed in a hollow box-shaped frame 7 having vapor inlets 13 and 16 on the upper and lower sides, and the communicating passages 10 and 10 are connected to refrigerant liquid inlets 11 and 12 provided in the frame 7, and the frame is In a plate heat exchanger configured to exchange heat between the steam in the chamber 7 and the refrigerant liquid in the element 6 which is at a higher pressure than the vapor, an annular gasket is provided around the upper and lower openings 8, 8 of each heat transfer element. The annular mounting grooves 17, 17 for mounting the heat transfer elements are integrally formed in the plate heat transfer surface of each heat transfer element by being recessed into the hollow inside by press working, and the annular grooves 17, 17 for mounting the heat transfer elements The mounting grooves 17 and 17 are faced to each other, and an annular mounting groove 1 is formed in this part.
Since the annular gaskets 9, 9 having a thickness greater than the depth of the gaskets 7, 17 are installed, even if the refrigerant liquid pressure in each heat transfer element 6 is higher than the vapor pressure in the frame 7, the pressure of the refrigerant in each heat transfer element 6 is There is no need to increase the polymerization clamping force. That is, the annular gaskets 9, 9 that independently surround the upper and lower openings 8, 8 between the heat transfer elements 6, 6 increase the refrigerant liquid pressure as the differential pressure between the vapor pressure and the refrigerant liquid pressure increases. As a result, it is subjected to a strong diameter expansion action, and is strongly pressed against the groove side surfaces 18, 18 on the outer diameter side of the annular mounting grooves 17, 17, so that a self-sealing action can be exerted. In addition, the annular mounting groove 1
Since the gaskets 7 and 17 are recessed so as to face each other in the overlapping direction of the heat transfer elements 6 and 6, it is possible to reliably prevent the gaskets 9 and 9 from rolling out. are integrally formed at the same time when the heat transfer plates 4 and 5 are press-formed,
It can be implemented easily and inexpensively.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the seal structure of a conventional plate heat exchanger, Fig. 2 is a schematic diagram showing the case where the present invention is applied to a condenser, and Fig. 3 is an enlarged cross-sectional view of the main part of Fig. 2. It is a diagram. 4, 5... Heat transfer plate, 17... Gasket groove, 18... Groove side surface.

Claims (1)

[Scope of utility model registration request] It has joining flanges 4a and 5a on the outer peripheral edge,
Two heat transfer plates 4, 5 having heat transfer surfaces 4b, 5b recessed from the bonding surface inside the joining flanges 4a, 5a are used, and the heat transfer surfaces 4b, 5b are faced to each other and externally. Peripheral joining flange part 4
a, 5a are joined to form a hollow heat transfer channel for refrigerant liquid sealed inside, and openings 8, 8 communicating with the heat transfer channel are bored above and below the heat transfer surfaces 4b, 5b. The upper and lower openings 8 and 8 of the thermal element 6 are connected to the heat transfer channel of the refrigerant liquid in each heat transfer element 6 by sequentially overlapping and tightening a large number of annular gaskets 9, 9 that independently surround the upper and lower openings 8, 8. communication path 1
0 and 10, and a steam passage is formed around each heat transfer element 6 and between each heat transfer element 6 by the annular gaskets 9 and 9. Outlet inlet 1
The communicating passages 10, 10 are connected to the refrigerant liquid inlets 11, 12 provided in the frame 7, and vapor and In a plate heat exchanger configured to exchange heat with the refrigerant liquid in each heat transfer element 6 at a higher pressure than the vapor, an annular gasket 9 is provided around the upper and lower openings 8 of each heat transfer element. The annular mounting grooves 17, 17 for mounting of each heat transfer element are integrally formed on the plate heat transfer surface of each heat transfer element by being recessed into the hollow inside by press working, and the annular mounting grooves 17, 17 at the top and bottom of each heat transfer element are formed integrally. 17, 17 facing each other, and annular gaskets 9, 9 having a thickness greater than the depth of the annular mounting grooves 17, 17 are attached to these portions.