JPH01263469A - Coolant heating heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a deterioration of decomposition of coolant and a thermal deterioration of major material of a heat exchanger by a method wherein a gas range having a low rate of thermal transmission exchanges heat with a first combustion gas passage and further exchanges heat with combustion gas of which temperature is slightly decreased. CONSTITUTION:Combustion gas ignited at a burner 2 at first passes through several fins while passing through a first combustion gas passage 6 of a major material 1 of a heat exchanger and then transmitted to a coolant pipe 5 closely held at a pipe holding part 8 at an outer circumference of the first combustion gas passage 6. At this time, since the coolant exchanges heat with a coolant of liquid phase or two phases since the outer circumference of a second combustion gas passage 7 acts as an outlet, and the combustion gas passed through the first combustion gas passage 6 is guided to a second combustion gas passage by a metering plate 4. The coolant of gas phase flows in the outer circumference of the second combustion gas passage 7. The combustion gas of which heat is exchanged with the first combustion gas passage 6 and temperature is a little decreased flows, so that the coolant may not be thermally decomposed. The major material of the heat exchanger may not be exposed to a high temperature and its thermal deterioration can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger for heating a refrigerant that heats and evaporates a refrigerant using combustion gas.

2. Description of the Related Art A conventional refrigerant heating heat exchanger will be described with reference to the drawings. FIG. 3 is a sectional view of the heat exchanger main material 101, which has a combustion gas passage 102 equipped with a large number of fins inside, and 12 tube holding parts 103 are arranged on the outer periphery in the axial direction of the combustion gas passage 102. There are multiple levels. In FIG. 4, a burner 104 is connected to one end of a heat exchanger main material 101, and an exhaust cap 105 is connected to the other end. In addition, heat exchanger main material i
A refrigerant pipe 106 is inserted into the pipe holding portion 103 of the oi. FIG. 5 is a diagram showing a refrigerant distribution path. The refrigerant entering from the refrigerant input rl 106a passes through the adjacent refrigerant pipe 106b as shown by the arrow, jumps over two refrigerant pipes 106cmd, enters the refrigerant pipe 106e, and then enters the refrigerant pipe 106f-1.
After passing through the refrigerant pipes 106a-b, the refrigerant enters the refrigerant pipe 106C, and the refrigerant pipe 106d is the outlet.

This is because when the refrigerant changes from liquid phase to two-phase to gas phase, it tends to overheat in the gas phase region where the heat transfer coefficient is low. area refrigerant pipe 1
06b and 106e in order to suppress the temperature rise.

Problems to be Solved by the Invention However, in this heat exchanger, the combustion gas flows through the refrigerant pipe 10.
Since heat exchange with the refrigerant in the gas phase region is unavoidable at 5 cmd, suppression of temperature rise cannot be said to be sufficient. moreover,
Piping to jump over the refrigerant pipe 105cmd and piping to jump over the refrigerant pipes 105a-b are required, which increases costs and requires space for routing the piping to jump over the refrigerant pipes, making the refrigerant heater smaller. (For example, Japanese Patent Application Laid-open No. 107167/1983).

The present invention has been made in view of the above-mentioned drawbacks, and in a refrigerant heat exchanger that evaporates refrigerant using high-temperature combustion heat, it ensures stable refrigerant heating and improves the durability of the heat exchanger, and also provides an inexpensive and compact refrigerant. It provides a heater.

Step 1 to Solve the Problems To solve the above problems, refrigerant heating J1 of the present invention]
The heat exchanger has two combustion gas passages inside, a plurality of fins along the 1111 direction on the inner surface of the combustion gas passage, and a plurality of tube holding parts integrally molded on the outer peripheral surface along the axial direction. This heat exchanger is connected to the first combustion gas passage side at one open end of the heat exchanger body, and the second combustion gas passageway is connected to the first combustion gas passage side at one open end of the heat exchanger body. an exhaust gear knob connected to the side, a throttle plate that communicates the first combustion gas passage and the second combustion gas passage at the other end, and a refrigerant inserted into the tube holding part of the heat exchange main material. A refrigerant pipe is formed by connecting adjacent refrigerant pipes, and one refrigerant pipe on the outer periphery of the second combustion gas passage is used for refrigerant.

Effect of the present invention With the above-described configuration, the combustion gas combusted in the burner first passes through the first combustion gas passage of the heat exchanger upper member, passes through a large number of fins, and then passes through the outer periphery of the first combustion gas passage. It is transmitted to the refrigerant tube held by the tube holding part. Here, since the refrigerant is disposed so that the outlet is on the outer periphery side of the second combustion gas passage, it exchanges heat with the refrigerant in the liquid phase or two-phase region at the outer periphery of the first combustion gas passage.

The combustion gas passing through the first combustion gas passage is guided to the second combustion gas passage by the throttle plate. Although the refrigerant in the gas region flows around the outer periphery of the second combustion gas passage, the refrigerant does not overheat because the combustion gas whose temperature has been slightly lowered through heat exchange in the first combustion gas passage flows.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a refrigerant heater in one embodiment of the present invention.

In the figure, 1 is the main material of the heat exchanger, and a burner 2 and an exhaust cap 3 are connected to one end, and a throttle plate 4 is connected to the other end. Furthermore, a refrigerant pipe 5 is held tightly on the outer periphery of the heat exchanger main material 1.

FIG. 2 is a sectional view of the heat exchanger main material 1 in the same embodiment. 6 is a first combustion gas passage, and 7 is a second combustion gas passage, both of which have a large number of fins on their inner surfaces. Further, there are twelve tube holding portions 8 on the outer periphery, which hold the refrigerant tubes 5 in close contact with each other. Adjacent refrigerant pipes 5 are connected to each other, enter from refrigerant pipe 5a, surround the outer periphery of heat exchanger main material 1 in an annular shape, and exit from refrigerant pipe 51 on the second combustion gas passage. has been done.

In the refrigerant heater configured as described above, the combustion gas combusted in the burner 2 first passes through the first combustion gas passage 6 of the heat exchanger main material 1, passes through a large number of fins, and then passes through the first combustion gas passage 6 of the heat exchanger main material 1. It is transmitted to the refrigerant pipe 5 which is closely held by the pipe holding part 8 on the outer periphery of the combustion gas passage 6. Here, since the refrigerant is disposed so that the outer peripheral side of the second combustion gas passage 7 is exposed, heat exchanges with the refrigerant in the liquid phase or two-phase region at the outer periphery of the first combustion gas passage 6. become. The combustion gas passing through the first combustion gas passage 6 is guided by the throttle plate 4 to the second combustion gas passage. Although the refrigerant in the gas region flows around the outer periphery of the second combustion gas passage 7, the combustion gas whose temperature has been slightly lowered through heat exchange in the first combustion gas passage 6 flows, so that the refrigerant is prevented from being overheated and decomposed. stomach. The main material of the heat exchanger is not exposed to high temperatures, preventing thermal deterioration. Moreover, since it is sufficient to connect adjacent refrigerant pipes, there is no need for piping to jump over the refrigerant pipes, and an inexpensive and compact refrigerant heater can be provided.

Effects of the Invention As is clear from the above explanation, the refrigerant heating heat exchanger of the present invention exchanges heat between the gas region with a low heat transfer coefficient and the first combustion gas passage, and exchanges heat with the combustion gas whose temperature has become slightly lower. Because the refrigerant exchanges heat with the refrigerant, it does not overheat and decompose and deteriorate. Heat exchanger material can also be prevented from thermal deterioration without being exposed to high temperatures. Further, since adjacent refrigerant pipes can be connected to each other, there is no need for piping that requires extra refrigerant, and an inexpensive and compact refrigerant heater can be provided.

[Brief explanation of the drawing]

FIG. 1 is a front view of a refrigerant heater according to an embodiment of the present invention, FIG. 2 is a sectional view of the main material of a heat exchanger in the same embodiment, and FIG. 3 is a main material of a heat exchanger in a conventional refrigerant heater. FIG. 4 is a perspective view of the refrigerant heater, and FIG. 5 is a diagram illustrating a refrigerant flow path of the refrigerant heater. 1 - heat exchanger main material, 2 - burner, 3 extraction cap, 4 throttle plate, 6 first combustion gas passage, 7
Second combustion gas passage. Name of agent: Patent attorney Toshio Nakao et al.

Claims (1)

[Claims] The main heat exchange material has two combustion gas passages inside, a plurality of fins along the axial direction on the inner surface of the combustion gas passage, and a plurality of tube holding parts on the outer peripheral surface along the axial direction. , a burner connected to the first combustion gas passage side of one open end of the heat exchange main material, an exhaust cap connected to the second combustion gas passage side of the one open end of the heat exchange main material, and the other opening. A constriction plate communicating the first combustion gas passage and the second combustion gas passage at the end, and a refrigerant pipe inserted into the pipe holding part of the heat exchange main material, and connecting adjacent refrigerant pipes. A heat exchanger for heating a refrigerant, in which a refrigerant pipe is formed by a refrigerant pipe, and a refrigerant pipe on the outer periphery of the second combustion gas passage is used as a refrigerant outlet.