JPH0226157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger, and relates to a heat exchanger used, for example, in an air-conditioning, heating, and water-heating system.

[Prior Art] For example, a heat exchanger used in a water heat exchanger such as a heat pump usually has an outer shell made up of a container through which a fluid to be cooled, such as underground water or tap water, flows, and an inner shell that is covered with water. A refrigerant pipe is provided for exchanging heat with the cold fluid.

[Problem to be solved by the invention]

In this type of heat exchanger, it is desirable to use synthetic resin for the outer shell in order to improve the corrosion resistance of the heat exchanger.

By the way, when the container of the heat exchanger is made of synthetic resin, the strength of the material itself is relatively weak, so the axial direction of the container must be supported by a highly rigid reinforcing member such as steel. However, if the heat exchanger container is made of synthetic resin and the reinforcing member is made of steel, etc., the heat exchanger will be deformed due to the difference in linear expansion coefficient between these materials, and in the worst case, the container will become deformed. There was a risk that the airtightness would be impaired or destruction would occur.

In addition, when this type of heat exchanger uses ground water as the heat fluid to be cooled, scale builds up on various parts inside the container over time, and this scale build-up causes a decrease in heat transfer coefficient. It is necessary to periodically disassemble and clean the water heat exchanger, and there is a demand for ease of disassembly and cleaning.

The present invention has been made in view of the above points, and its purpose is that even when a synthetic resin is used for the container of the heat exchanger and a highly rigid member such as steel is used for the member reinforcing it, To provide a highly corrosion-resistant heat exchanger having sufficient strength and preventing the occurrence of defects due to linear expansion differences between members as described above, and also to simplify disassembly and cleaning in terms of structure. An object of the present invention is to provide a heat exchanger that can improve maintenance management of the device.

[Means to solve the problem]

The present invention is configured as follows to achieve the above object. Hereinafter, the present invention will be described with reference to the reference numerals of the embodiment shown in FIG. 2 in order to facilitate understanding of its contents.

That is, the present invention provides a container 27 through which a fluid to be cooled flows, and a refrigerant pipe 29 provided in the container.
In the heat exchanger, the container 27 is an axially long synthetic resin cylinder, and a water seal lid 33 is fitted to at least one end of the inside of the cylinder so as to be slidable in the axial direction of the cylinder, and an inlet of the refrigerant pipe 29 is provided. Both the side and outlet side pipe parts 31 and 32 are inserted and fixed into the same water seal lid 33, and the refrigerant pipe 29 is attached to the water seal lid 33 so that it can move together with the water seal lid 33. A packing 30 is provided on the outer periphery of the container 33, and the packing 30 is interposed between the inner and outer peripheries of the container 27 and the water seal lid 33, and the container 27 is attached to a highly rigid metal reinforcing member 37 made of steel or the like via the water seal lid 33. is held in the axial direction of the cylinder.

[Effect]

According to the present invention having such a configuration, the highly rigid metal reinforcing member 37 holds the container 27 in the axial direction via the water seal lid 33. The reinforcing member 37 sufficiently absorbs the fluid pressure in the cylindrical axis direction (water pressure inside the container) applied to the end portion of the container 27 such as the water seal lid 33. Further, the water temperature of the fluid to be cooled in the container is transmitted to the high-rigidity metal reinforcing member 37 via the container 27 .

The container 27 is a cylinder made of synthetic resin that is long in the axial direction, and the high-rigidity reinforcing member 37 is made of a metal member. Therefore, when a temperature change occurs, a linear expansion difference ( However, in the present invention, the water seal lid 33 held by the reinforcing member 37 is slidably fitted inside the cylinder (container) relative to the container 27. Therefore, the difference in linear expansion is absorbed by the sliding movement of the water seal lid 33.

The mechanism of linear expansion difference absorption will now be explained based on FIG. 4.

FIG. 4 shows, among the components of the present invention, a container 27,
This is a diagram showing the relationship between the water sealing lid 33 and the high-rigidity metal reinforcing member 37, in which A is a diagram schematically showing a case where the fluid temperature in the heat exchanger container decreases, and B is a diagram showing a case where the temperature rises. It is.

Here, as an example, the distance between the water seal lid 33 of the heat exchanger and the end wall 26 of the container 27 is 2000 mm based on 0°C.
The reinforcing member 37 is made of steel and has a coefficient of linear expansion of 11×
10 ^-6 , when the container 27 is made of vinyl chloride resin and has a coefficient of linear expansion of 12 x 10 ^-5 , and the water temperature in the heat exchanger is 0 to 60.
Reinforcement member 37 and container 2 when changing in the range of °C
Calculating the relative length change δ with respect to 7, δ=2000×(12× ^10-5 −11× ^10-6 )×(60-0)=13.1(mm), where δ=13.1mm is the linear expansion dimension. Amount of change (linear expansion difference)
becomes.

In this case, the pressure inside the heat exchanger container 27 is P,
If the atmospheric pressure is P ₀ , the water sealing lid 33 has a reinforcing member 37
is pressed with a pressure of P-P ₀ , and on the other hand,
As is clear from the above calculation formula, the container 27
The elongation rate due to temperature rise between the reinforcing member 37 and the container 27 is greater than that of the container. A relative movement occurs.

Specific movement in this case (movement when temperature rises)
In the drawings, the container 27 is indicated by arrow Y in FIG. 4B.
It can be understood that the water seal lid 33 slides downward relative to the elongation.

Furthermore, when the water temperature inside the container 27 decreases, the contraction rate of the container 27 is greater than that of the high-rigidity metal reinforcing member 37. It can be understood that the water seal lid 33 is relatively slid upward.

As described above, even if a linear expansion dimensional change δ occurs between the high-rigidity metal reinforcing member 37 and the container 27 due to temperature change, this can be absorbed by the relative movement of the water seal lid 33 with respect to the container 27. Therefore, deformation of the container 27 etc. can be prevented.

In addition, since the pipe portions 31 and 32 on both the inlet and outlet sides of the refrigerant pipe 29 are inserted through and fixed to the same water seal lid 33, the refrigerant pipe 29 has a structure in which it only engages with the water seal lid 33, and its As a result, even if a relative positional displacement occurs between the container 27 and the water seal lid 33 due to the thermal expansion difference (linear expansion dimensional change amount δ) as described above, the relative positional displacement between the water seal lid 33 and the refrigerant pipe 29 The positional relationship is maintained constant, and the refrigerant pipes 29 can be prevented from expanding and contracting deformation and fatigue damage caused by this over time.
Furthermore, since the gasket 30 that follows the movement of the water seal lid 33 is interposed between the water seal lid 33 and the container 27, the airtightness of the container 27 is maintained. By performing such actions, the integrity of the heat exchanger is maintained, and as a result, a heat exchanger having high corrosion resistance and sufficient strength can be realized.

Moreover, according to the present invention, both the inlet side and outlet side tube parts 31 and 32 of the refrigerant pipe 29 are inserted and fixed into the same water seal lid 33, and the refrigerant pipe 29 is inserted into the water seal lid 33.
Since it can be moved together with 3, the water seal lid 33
If it is removed, the refrigerant pipe 29 can also be removed as a whole.
Therefore, the water seal lid 33 and the refrigerant pipes 29 can be easily removed and reassembled, and therefore the disassembly and cleaning of the heat exchanger can be simplified.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

First, Fig. 1 is a system diagram of an air-conditioning and hot water supply system using a heat exchanger according to an embodiment of the present invention and uses groundwater as a heat source, and Fig. 2 is a system diagram of a water heat exchanger on the heat source side according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the vessel.

First, to explain the system diagram in Figure 1, 1
is a compressor, 2 is a four-way valve, 3 is a water heat exchanger on the heat source side,
4 and 4a are check valves, 5 is a liquid receiver, 6 and 6a are expansion valves, and 7 is a load side water heat exchanger.

In addition, 8 is a circulation pump, 9, 9a are water piping lines,
10 is a fan coil unit, and 16 and 17 are solenoid valves.

11 is a water suction well, 12 is a suction pipe, 13
14 is a water pump, 14 is a discharge pipe, and 15 is a return well.

Also, 18 is a hot water tank, 19 is a ball tap, 2
0 is a pressure tank, 21 is a pressure switch, 22 is a hot water pump, and 23 is a faucet.

That is, during cooling, the compressor 1 evaporates the refrigerant through the expansion valve 6 through the heat source side water heat exchanger 3, the check valve 4, and the liquid receiver 5 under the control of the four-way valve 2, and converts the refrigerant into the load side water. After exchanging heat in the heat exchanger 7, a cycle is formed in which the compressor 1 is returned to the compressor 1 via the four-way valve 2.

At that time, the load side water heat exchanger 7 is operated by the circulation pump 8
This removes indoor heat from the fan coil unit 10 through the water pipes 9 and 9a, and the heat is transferred to the groundwater suction well 11, suction pipe 12, pump pump, The water is then discharged into the reduction well 15 via the discharge pipe 14.

Furthermore, during heating, the refrigerant from the compressor 1 is directed in the opposite direction to that during cooling by the operation of the four-way valve 2.
The heat source side water heat exchanger 3 removes heat from the groundwater through the load side water heat exchanger 7, check valve 4a, liquid receiver 5, and expansion valve 6a, and the load side water heat exchanger 7 transfers heat. It is constructed as if it were thrown away.

That is, during heating, heating is possible by guiding hot water to the fan coil unit 10 by the circulation pump 8, and the solenoid valves 16, 17
By switching, the water in the hot water tank 18 can be heated by circulating hot water in the hot water tank 18.

The details of the heat source side water heat exchanger 3 according to an embodiment of the present invention will be described later, but in the above water heat source type heat pump, first, the heat exchanger 3 transfers heat. By using underground water from the water absorption well 11 that has a constant temperature throughout the year, energy conversion efficiency is increased, and the load side water heat exchanger 7 is equipped with a ball tap 1
By guiding the tap water through 9, the water pipe line 9,
This is to prevent corrosion and scaling of the fan coil unit 10, hot water storage tank 18, etc.

Additionally, in the heat pump described above, a program timer (not shown) is used to set the heating of the water in the hot water tank 18 at an arbitrary time period when cooling or heating is not performed, and the solenoid valve is turned on. This is done by circulating hot water heated by the load-side water heat exchanger 7 into the hot water tank 18 by the circulation pump 8 through interlocking of the components 16 and 17.

In addition, the hot water stored in the hot water storage tank 18 is separated from the tap water by the ball tap 19, so the hot water is separated from the water by the pressure tank 20 and pressure switch 2.
The hot water is pressurized by a hot water supply pump 22 controlled by the water supply pump 1 and then introduced to a faucet 23.

Next, the structure of the heat source side water heat exchanger 3 according to an embodiment of the present invention will be described in detail with reference to FIG.

In the figure, 24 and 25 are groundwater inlets and 26
is an end wall, 27 is an outer cylinder (container), 28 is an inner cylinder, 29
3 is a refrigerant pipe, 30 is a gasket, 31 and 32 are pipe portions on the inlet and outlet sides of the refrigerant pipe 29 (hereinafter referred to as inlets and outlets), 33 is a water sealing lid, and 34 is a heat exchange chamber.

Further, 35 is an O-ring, 36 is a seal box, 37 is a frame, 38 is a bolt, 39 is a through hole, and 40 is a water passage.

Among these elements, groundwater inlet/outlet 24, 25
The end wall 26 having this shape forms a closed end wall of the outer cylinder 27 and inner cylinder 28 of the container. Outer cylinder 27 and inner cylinder 2
8 are provided so as to form concentric cylinders between which the refrigerant pipe 29 is wound into a cylindrical coil shape and inserted. Inside the other end of the outer cylinder 27 is a water seal lid 33.
is fitted so as to be slidable in the axial direction of the cylinder. A packing 30 is provided on the outer periphery of the water sealing lid 33, and the packing 30 is interposed between the outer cylinder 27 and the water sealing lid 33 to seal the inside of the outer cylinder 27, and the space between the outer cylinder 27 and the inner cylinder 28. A heat exchange chamber 34 is formed.

The refrigerant pipe 29 is installed with both its inlets and outlets 31 and 32 inserted into and fixed to the water seal lid 33,
It has a structure that allows it to move together with the water seal lid 33.
The refrigerant ports 31 and 32 are watertightly fixed by an O-ring 35 and a seal box 36.

The end wall 26 and the lid 33 are held by a frame (reinforcing member) 37 and bolts 38 in a position adjustable manner against the water pressure inside the heat exchange chamber 34.

Here, the outer tube 27 and the inner tube 28 are made of synthetic resin, and the frame 37 is made of a highly rigid member such as steel. The frame 37 in the embodiment is formed by bending a steel material into a U-shape, and a bolt 38 is provided at one end of the frame 37. The tip of the bolt 38 is connected to the lid 33, and the other end of the frame 37 is connected to the outer surface of the end wall 26. It is applied.
In addition, the groundwater inlets and outlets 24 and 25 are connected to the heat exchange room 3.
4. They communicate through the through hole 39 and the water passage 40.

According to the embodiment, the water pressure in the axial direction of the heat exchanger can be maintained and the outer cylinder 27 and the lid 33 can be slid relative to each other by simply increasing the strength of the frame 37. Therefore, the difference in linear expansion caused by temperature changes in the outer cylinder 27, frame 37, etc. can be sufficiently absorbed, and the life and strength of the heat exchanger can be significantly improved. Note that the details of this linear expansion difference absorption are detailed in the "effect" section of the invention, so please refer to them. Further, the inlet/outlet port 31 of the refrigerant pipe 29,
32 are both fixed to the same water seal lid 33. Therefore, the refrigerant pipe 29 is connected only to the water seal lid 33, so that the frame 37, the lid 33
The refrigerant pipe 29 follows the sliding movement of the lid 33 due to the linear expansion difference, and as a result, the relative positional relationship between the lid 33 and the refrigerant pipe 29 is always kept constant, causing expansion/contraction deformation and fatigue in the refrigerant pipe 29. can be prevented.

In addition, the frame 37 can be easily removed from the outside by loosening the bolts 38, and by removing the frame 37, the water seal lid 33 and refrigerant pipe 29 can be easily removed from the outer cylinder 27 as one unit. Thus, the inside of the container 27 and the refrigerant pipe 29 can be cleaned. This makes it possible to remove scale from, for example, the water piping system, including the refrigerant pipes 29, thereby improving the maintenance management of the heat exchanger.

In the above description, the refrigerant inlet and outlet may be either reference numerals 31 or 32, and regarding water, there is no particular need to distinguish between the groundwater inlets and outlets 24 and 25.

Further, the frame 37 may be provided inside the heat exchanger 3, and in this case as well, it can withstand a wide range of temperature changes, can sufficiently absorb the amount of linear expansion dimensional change, and no problem arises in strength.

Next, FIG. 3 is a longitudinal sectional view of a heat source side water heat exchanger according to another embodiment of the present invention.

In the figure, parts with the same symbols as in FIG. 2 indicate equivalent parts, 3A is a heat source side water heat exchanger, 27A is an outer cylinder, 41 is a bottom cover related to a water seal, and 42 is a packing.

The difference between this embodiment and the previous embodiment is that the end wall 26 of the outer cylinder 27 is not integrated, so that the bottom cover 41 with the inner cylinder 28
is slidably fitted into one end of the outer cylinder 27.

That is, in this embodiment, the water seal lids 33 and 41 are slidably arranged at both ends of the inside of the container (outer cylinder) 27A, and this configuration increases the convenience of cleaning by disassembling the container. At the same time, the ability to adjust to temperature changes is increased, and in manufacturing, the outer cylinder 27A can be a simple cylindrical body that does not require any special molding process, making it possible to improve productivity. It is possible.

Note that the optional use of the refrigerant inlet and outlet, the groundwater inlet and outlet, and the arrangement of the frame are the same as those described in the previous embodiment.

However, although each of the above embodiments has been explained as relating to a heat source side water heat exchanger, this does not preclude its use in a load side water heat exchanger, and in particular, it can be used for a load side water heat exchanger. Equivalent functions can be expected.

In addition, although each embodiment has been exemplified to be used in an air-conditioning/heating/hot-water supply device that uses groundwater as a heat source, the device according to the present invention is a general-purpose device that can meet similar demands.

〔Effect of the invention〕

As described above, according to the present invention, even when a synthetic resin is used for the heat exchanger container and a highly rigid member such as steel is used for the member reinforcing it, the difference in linear expansion between these members can be effectively compensated for. Absorption prevents deformation of containers, refrigerant pipes, etc., and maintains a sound seal, making it possible to create a heat exchanger with sufficient strength and high corrosion resistance. , the refrigerant pipes can be easily removed, the container, the refrigerant pipes, etc. can be easily disassembled and cleaned, and the maintenance management of the entire apparatus can be improved.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an air-conditioning/heating hot water supply system using groundwater as a heat source using an embodiment of the present invention, and FIG. 2 is a vertical cross-section of a water heat exchanger on the heat source side according to an embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a heat source side water heat exchanger according to another embodiment, and FIG. 4 is an explanatory diagram showing the operating principle of the present invention. 3,3A...Heat source side water heat exchanger, 27,27A
... Container (outer cylinder), 28 ... Inner cylinder, 29 ... Refrigerant pipe, 30, 42 ... Packing, 31, 32 ... Inlet/exit part, 33 ... Water seal lid, 37 ... High rigidity reinforcing member ( frame), 41...bottom cover.

Claims (1)

[Scope of Claims] 1. A heat exchanger comprising a container through which a heated fluid to be cooled flows and a refrigerant pipe provided in the container, wherein the container is an axially long cylinder made of synthetic resin, and at least the inside of the cylinder is A water seal lid is fitted to one end so as to be slidable in the axial direction of the cylinder, and both the inlet side and outlet side pipe parts of the refrigerant pipe are inserted and fixed into the same water seal lid. The refrigerant pipe is attached so as to be movable together with the water seal lid, a packing is provided on the outer periphery of the water seal lid, and the packing is interposed between the inner and outer peripheries of the container and the water seal lid, and A heat exchanger characterized in that the container is held in the cylindrical axial direction by a highly rigid metal reinforcing member such as steel material through a water sealing lid. 2. The heat exchanger according to claim 1, wherein the water seal is slidably disposed at both ends inside a cylinder of the container.