CN207622268U - Heat exchanger and heat pump water heater - Google Patents

Abstract

The utility model discloses a heat exchanger and a heat pump water heater. The heat exchanger includes a plate shell, the plate shell has an arc-shaped concave surface, the inside of the plate shell has an inner cavity, and the end of the plate shell The part has a liquid inlet and a liquid outlet respectively communicating with the inner cavity. The heat exchanger of the utility model can be used as the bottom support of the water tank and welded tightly with the body of the water tank by setting the arc-shaped concave surface, so as to increase the heat exchange area, improve the heat exchange capacity, and effectively solve the problem of low water temperature at the bottom of the water tank.

Description

Heat exchanger and heat pump water heater

technical field

The utility model belongs to the technical field of heat exchangers.

Background technique

At present, some air source heat pump water heaters adopt static heating type, and the condenser is divided into inner disk and outer disk type, of which the outer disk type is wound with copper tube or micro-channel flat tube outside the inner tank body, and copper tube spiral coil is used at the bottom of the water tank However, the water temperature at the bottom of the water tank is still relatively low after the heating is completed. The reason is that on the one hand, the contact surface between the copper tube and the bottom liner is small, and the heat transfer surface is small; on the other hand, the temperature of the refrigerant in the copper tube is low. , the heat transfer temperature difference is small, which causes the bottom water temperature to keep rising. When calculating the energy efficiency of the whole machine, the bottom water temperature lowers the overall temperature of the water tank and reduces the energy efficiency of the system.

Contents of the invention

In order to solve the technical problem that the existing heat exchanger cannot satisfy the poor heat exchange performance of the outer disc heat exchanger used at the bottom of the water tank of the heat pump water heater, the utility model proposes a heat exchanger, which can solve the above problems.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions to realize:

A heat exchanger, comprising a plate shell, the plate shell has an arc-shaped concave surface, the inside of the plate shell has an inner cavity, and the ends of the plate shell have liquid inlets respectively communicated with the inner cavity and outlet.

Further, the inner cavity is formed by interposing the concave surface and the opposite surface of the concave surface.

Further, several groups of baffles are formed on the inner wall of the inner cavity, and the baffles surround the inner cavity to form several flow channels.

Further, the baffle is in the form of herringbone corrugation, oblique line, parallel or corrugated plate.

Further, reinforcing ribs are provided in the inner cavity and/or on the outer surface of the plate shell.

Further, the inner cavity is an arc-shaped cavity, and the height of the inner cavity is 1-3 mm.

Further, a refrigerant heat exchange tube is arranged in the inner cavity, the refrigerant heat exchange tube is spirally arranged in the inner cavity, the inlet of the refrigerant heat exchange tube protrudes from the liquid inlet, the The outlet of the refrigerant heat exchange tube protrudes from the liquid outlet.

Further, the liquid inlet and the liquid outlet are arranged symmetrically on both sides of the plate shell.

The utility model also proposes a heat pump water heater, which includes a water tank and the heat exchanger according to any one of claims 1-8, the heat exchanger is arranged below the water tank, and the water tank has a bottom opening The outer shell and the inner tank arranged in the outer shell, the heat exchanger is sealed and fixedly connected with the bottom of the outer shell.

Further, the heat exchanger is welded and fixed to the shell.

Compared with the prior art, the advantages and positive effects of the utility model are: the heat exchanger of the utility model can be closely attached to the bottom of the water tank liner with a convex arc shape by setting an arc-shaped concave surface, thereby increasing the exchange rate. The thermal area improves the heat transfer capacity and effectively solves the problem of low water temperature at the bottom of the water tank.

After reading the detailed description of the embodiments of the utility model in conjunction with the accompanying drawings, other features and advantages of the utility model will become clearer.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a kind of embodiment structural representation of the heat exchanger proposed by the utility model;

Fig. 2 is the structural representation of another form of the heat exchanger proposed by the utility model;

Fig. 3 is a schematic diagram of an inner cavity structure of the heat exchanger proposed by the utility model;

Fig. 4 is a schematic diagram of another inner cavity structure of the heat exchanger proposed by the utility model;

Fig. 5 is a schematic diagram of another inner cavity structure of the heat exchanger proposed by the utility model;

Fig. 6 is a schematic diagram of another inner chamber structure of the heat exchanger proposed by the utility model;

Fig. 7 is a structural schematic diagram of an embodiment of the heat pump water heater proposed by the utility model.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Based on the current static heating type air source heat pump water heater, the heat exchanger is generally an inner plate and an outer plate type. The inner plate type is set inside the water tank, and the heat exchange efficiency is higher than that of the outer plate type, but it is easy to scale when it is in direct contact with water. The outer plate type is inside The outside of the barrel body is wound with copper tubes or micro-channel flat tubes, and the copper tube spiral is used at the bottom of the water tank. Due to the small contact area with the water tank, the water temperature at the bottom of the water tank is still relatively low after heating. In order to solve For the problem of low heat exchange efficiency of the outer plate heat exchanger, the utility model designs the heat exchanger into a plate-shell shape, and the plate shell has an arc-shaped concave surface, which is compatible with the convex-arc-shaped bottom of the water tank liner It can fit closely with the bottom of the water tank, increases the heat exchange area, and can improve the heat exchange efficiency. A specific embodiment will be described in detail below.

Embodiment one

This embodiment proposes a heat exchanger, as shown in Figure 1 and Figure 2, including a plate shell 11, the plate shell 11 has an arc-shaped concave surface 11a, the plate shell 11 has an inner cavity 12 inside, and the plate shell 11 The end portion has a liquid inlet 13 and a liquid outlet 14 respectively communicating with the inner cavity 12 . The heat exchanger of this embodiment, by setting the arc-shaped concave surface, can be closely attached to the bottom of the convex-arc-shaped water tank liner, increasing the heat exchange area, improving the heat exchange capacity, and effectively solving the problem of low water temperature at the bottom of the water tank. question. Among them, the refrigerant can be injected into the inner cavity through the liquid inlet, and the refrigerant after heat exchange flows out from the liquid outlet, and then enters the evaporator to absorb heat, and thus circulates.

The inner cavity 12 is formed by interposing the concave surface 11a and the opposite surface 11b of the concave surface 11a. The side of the plate shell 11 opposite to the concave surface 11a can be an arc surface structure consistent with the curvature of the concave surface 11a, or a structure with a base, which has an upper surface consistent with the curvature of the concave surface 11a, and is surrounded by the concave surface 11a. A sealed cambered inner cavity 12 is formed.

In order to improve the uniformity of refrigerant flow, several groups of baffles 15 are formed on the inner wall of the inner chamber 12, and the baffles 15 surround the inner chamber 12 to form several flow channels. The refrigerant flows evenly in the inner cavity 12 under the distribution of the baffle plate 15, so as not to flow in a certain place, which further increases the heat exchange area and improves the heat exchange efficiency.

Baffle plate 15 can be herringbone corrugated type as shown in Figure 3, Figure 4, oblique line type as shown in Figure 5, parallel type or corrugated plate type, certainly, baffle plate 15 is not limited to above-mentioned several structures, can also be The baffle plate 15 of other structural styles can be used as long as the effect of evenly distributing the refrigerant can be achieved.

In order to improve the load-bearing capacity of the heat exchanger and prevent it from being deformed by the water tank when it is arranged at the bottom of the water tank, reinforcing ribs are preferably provided in the inner cavity 12. Of course, the reinforcing ribs can also be provided on the outer surface of the plate shell 11, or at the same time. The cavity 12 and the outer surface of the plate shell 11 play a role in strengthening the supporting capacity of the heat exchanger, and the reinforcing rib can also play the role of fixing the distance. The ribs can be fixed in the inner cavity 12 or on the outer surface of the plate shell 11 by means of spot welding.

The inner cavity 12 is formed by sandwiching the concave surface 11a and the opposite surface 11b of the concave surface 11a. It is an arc-shaped cavity. In order to increase the flow rate of the refrigerant, the flow section of the refrigerant in the inner cavity 12 is limited. It is preferable that the height of the inner cavity 12 is 1 ~3mm, in order to achieve the purpose of controlling the internal volume, reducing the amount of refrigerant charge and the deposition of press oil.

The inner cavity 12 in this embodiment is not limited to direct injection of refrigerant for heat exchange, but can also be filled with antifreeze. The disc is arranged in the inner cavity 12 , the inlet of the refrigerant heat exchange tube 16 protrudes from the liquid inlet 13 , and the outlet of the refrigerant heat exchange tube 16 protrudes from the liquid outlet 14 . By placing the refrigerant heat exchange tube in the form of a spiral disk and placing it in the inner cavity, the pressure of the inner cavity can be reduced, and at the same time, it can prevent the refrigerant from contacting the inner cavity and produce impurities, which will not cause adverse effects on the operation of the system.

In order to improve the flow path of the refrigerant in the inner cavity 12 and further improve the heat exchange efficiency, the liquid inlet 13 and the liquid outlet 14 are preferably arranged symmetrically on both sides of the plate shell 11. At this time, from the liquid inlet 13 to the liquid outlet 14 takes the longest path.

Embodiment two

This embodiment proposes a heat pump water heater, as shown in Figure 7, including a water tank 20, and also includes the heat exchanger described in Embodiment 1, the heat exchanger is arranged below the water tank 20, and the water tank 20 includes a The outer casing 201 and the inner tank (not shown in the figure due to angle reasons) arranged in the outer casing 201 , and the heat exchanger is sealed and fixedly connected with the bottom of the outer casing 201 . The structure of the heat exchanger is shown in Figures 1-6, including a plate shell 11, the plate shell 11 has an arc-shaped concave surface 11a, the inside of the plate shell 11 has an inner cavity 12, and the ends of the plate shell 11 have respectively The liquid inlet 13 and the liquid outlet 14 connected to the inner cavity 12, and the bottom of the water tank 20 are closely attached to the concave surface 11a of the plate shell 11. Since the refrigerant flows in the inner cavity 12, the entire surface of the concave surface 11a can be in contact with the inner cavity. The water in the tank exchanges heat, and the bottom of the inner tank is closely attached to the concave surface 11a of the plate shell 11, so the heat transfer area can be increased, the heat transfer capacity can be improved, and the problem of low water temperature at the bottom of the water tank can be effectively solved.

For other structures of the heat exchanger, reference may be made to the description in Embodiment 1, which will not be repeated here.

In order to improve the stability of the connection between the water tank 20 and the heat exchanger, the water tank 20 and the plate shell 11 are preferably welded and fixed, and of course other fixing methods can also be used, not limited to welding and fixing.

Of course, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above-mentioned examples. Those of ordinary skill in the art may make changes, modifications, additions or replacements within the essential scope of the present utility model. It should also belong to the protection scope of the present utility model.

Claims (10)

1. A heat exchanger, characterized in that: it includes a plate shell, the plate shell has an arc-shaped concave surface, the inside of the plate shell has an inner cavity, and the end of the plate shell has a The liquid inlet and liquid outlet connected by the cavity. 2. The heat exchanger according to claim 1, wherein the inner chamber is formed by interposing the concave surface and the opposite surface of the concave surface. 3. The heat exchanger according to claim 1, characterized in that: several groups of baffles are formed on the inner wall of the inner cavity, and the baffles surround the inner cavity to form several flow channels. 4. The heat exchanger according to claim 3, characterized in that: the baffle is in the form of a herringbone corrugation, oblique line, parallel or spot wave plate. 5. The heat exchanger according to any one of claims 1-4, characterized in that: reinforcing ribs are provided in the inner cavity and/or the outer surface of the plate shell. 6. The heat exchanger according to any one of claims 1-4, characterized in that: the inner cavity is an arc-shaped cavity, and the height of the inner cavity is 1-3 mm. 7. The heat exchanger according to any one of claims 1-4, characterized in that: the inner cavity is provided with a refrigerant heat exchange tube, and the refrigerant heat exchange tube is spirally arranged in the inner cavity, The inlet of the refrigerant heat exchange tube protrudes from the liquid inlet, and the outlet of the refrigerant heat exchange tube protrudes from the liquid outlet. 8. The heat exchanger according to any one of claims 1-4, characterized in that: the liquid inlet and the liquid outlet are arranged symmetrically on both sides of the plate and shell. 9. A heat pump water heater, comprising a water tank, and further comprising the heat exchanger according to any one of claims 1-8, the heat exchanger being disposed below the water tank, the water tank comprising a shell with an open bottom and setting In the inner tank in the outer shell, the heat exchanger is sealed and fixedly connected with the bottom of the outer shell. 10. The heat pump water heater according to claim 9, wherein the heat exchanger is welded and fixed to the shell.