JPH04129888U - reciprocating compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the performance of the intercooler in a reciprocating multi-stage compressor, reduce its size, eliminate dead space, and achieve size and weight reduction. [Structure] The intercooler is a heat pipe type cooler 16. The outer shape of the heat pipe type cooler 16 from one direction is made to be approximately the same size as the side outer diameter of the crankcase 11 where the oil sump portion 13 is located, and the total length in this direction is made to be the same size as that of the low pressure cylinder 1.
4 or the high pressure cylinder 15. A heat pipe type cooler 16 is arranged in a space surrounded by an oil reservoir 13 of a crankcase 11, a low pressure cylinder 14, and a high pressure cylinder 15. A pipe 17 extends into the space from the side surfaces of the low-pressure cylinder 14 and high-pressure cylinder 15 and is connected to the cooling section 21 of the heat pipe type cooler 16.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a reciprocating compressor, especially a reciprocating compressor with a horizontal cylinder arrangement. .

0002

[Conventional technology]

The reciprocating air compressor described in Utility Model Application Publication No. 2-64767 is as shown in Figure 4. The side surface of the crank case 1 in which the crank part 2 and the oil reservoir part 3 are arranged vertically The cylinder body 4 extends horizontally from a position facing the crank part 2. this In such reciprocating compressors, in the multi-stage type, the cylinder body 4 is a low pressure cylinder. It is divided into high pressure cylinders in multiple stages, which are arranged horizontally, An intercooler is installed between the cylinders of each stage via piping. That is, As shown in Fig. 3, the intercooler 5 used in the multistage air compressor has a cylinder case 1. The intercooler 5 and the cylinder lid 6 are sandwiched between each other and are provided on the opposite side of the cylinder body 4. are connected by a long pipe 7. Therefore, there is a wide range of space for installing the intercooler 5 and piping 7. This required space, which hindered efforts to make reciprocating compressors smaller and lighter. this In addition, as shown in Figure 4, the air space surrounded by the oil reservoir 3 and cylinder 4 of the crankcase 1 is The dead space between S makes it possible to make reciprocating compressors smaller and lighter. This was a major hindrance.

0003 In order to solve this problem, an intercooler 5 is arranged in the space S, and the intercooler Although it is conceivable to connect 5 and cylinder lid 6 with piping 7, This causes a problem that the cooling performance of the intercooler 5 is insufficient. this is, The intercooler 5 installed in the conventional reciprocating compressor is a natural air cooling type Erofinch. This is due to the tube shape.

0004 In other words, the cooling performance of the Erofin tube type intercooler depends on the fin tube length. Determined by On the other hand, in order to accommodate the intercooler 5 in the space S, It is effective to reduce the fin tube length in small increments, but in order to do so Therefore, it is necessary to make the fin tube into a reciprocating shape through a U-turn. However, due to manufacturing issues, fins cannot be provided at the U-turn section. The cooling effect is reduced, and even if the length of the tube is halved, this is explained in Figure 3. It is not possible to maintain cooling performance equivalent to that of the intercooler 5. Then, intermediate cooling Since the piping 7 connecting the evaporator 5 and the cylinder lid 6 is essential, this piping is 7 in the space S, the installation space for the intercooler 5 becomes that much. As the fin tube becomes narrower, it becomes necessary to further shorten the length of the outward and return paths of the fin tube. A situation occurs in which the cooling performance further deteriorates.

[0005] In addition, the cooling performance of the intercooler 5 is made the same as that in Fig. 3, and it is If the intercooler 5 and piping 7 are installed using the space S in the cylinder 4, Because it protrudes in front of the tip of the cylinder head or under the cylinder case 1, An increase in the overall external dimensions is unavoidable.

[0006]

[Problem that the idea aims to solve]

This idea aims to improve the performance of the intercooler, reduce its size, and thereby The intercooler and piping can be easily accommodated in the space S to eliminate dead space. The problem to be solved is to solve this problem and to make the reciprocating compressor smaller and lighter.

[0007]

[Means to solve the problem]

The technical measures taken to achieve the above task are the basic ones as explained in Figure 4. In a reciprocating compressor with a cooling section; and a plurality of heat pipes, one end of which is inserted and supported in the cooling section. A heat pipe type cooler is used, and the outer shape of the cooler from one direction is such that the oil sump is located The size should be approximately the same as the side profile of the crankcase where it will be placed, and the entire length in this direction should be cylinder or high pressure cylinder, and connect it to the oil sump part of the crankcase and the low pressure cylinder. The cylinder is placed in a space surrounded by the high pressure cylinder, and the piping is connected to the low pressure cylinder. and by extending into this space from the side of the high pressure cylinder and connecting to the cooling section. be.

[0008]

[Effect]

The thermal transmittance of a heat pipe cooler is

[0009]

[Math 1] It is calculated by

0010 However, Ab is the heat transfer area RP is the ratio of the inner and outer areas of the heat transfer tube Rb is the heat transfer area ratio inside and outside the box-shaped container α1 is the heat transfer coefficient inside the box-shaped container α0 is the heat transfer coefficient on the atmospheric side αHP is the heat transfer coefficient in the heat pipe γ is the dirt coefficient φ1 is the fin efficiency on the box-shaped container side φ0 is the atmosphere side fin efficiency It is.

[0011] In the calculation formula,

0012

[Math 2] This term is due to the movement of the liquid in the heat pipe and depends on the heat transfer coefficient of the tube material. Here, the heat transfer coefficient of the copper heat pipe is 4.3 kcal/mH°C, and the heat transfer coefficient of the copper tube Erofin tube is 0.09 kcal/mH°C. Further, the value of the heat transfer area ratio Rb between the inside and outside of the box-shaped container greatly influences the heat transmittance, and in the case of a heat pipe, this Rb can be increased. Therefore, from the above two points, the heat pipe type cooler has a higher heat transmittance than the Erofin tube type cooler.

[0013] Due to the above, this heat pipe type cooler can also be connected to the low pressure and high pressure cylinders. Including, located in the space surrounded by the oil reservoir part of the crankcase and the low pressure and high pressure cylinders. However, it is possible to obtain the same cooling effect as before, making the reciprocating compressor smaller and lighter. can be achieved.

[0014]

【Example】

FIG. 1 is a side view of a reciprocating compressor according to an embodiment of this invention, and FIG. 2 is a plan view of the same. . In this embodiment, the crank case 11 includes a crank part 12 and an oil reservoir part 13. are arranged vertically. Also, the crank part 1 is located on the side of the crank case 11. The low pressure cylinder 14 and the high pressure cylinder 15 extend horizontally from the position facing the cylinder 2. has been done.

[0015] The intercooler 16 is connected to the low pressure cylinder 14 and the high pressure cylinder 15 through piping 17... At the same time, a bracket 18 and bolts 19 are connected to the crankcase 11. Mounted and supported through. A heat pipe type cooler is used for the intercooler 16. This heat pipe type cooler uses multiple pipes with working fluid sealed inside. One end of the heat pipe 20 is inserted and supported in the cooling part 21 made of a box-shaped container, and the other end is A plurality of fins 22 are attached to the side and exposed to the atmosphere. And piping 17 The heat pipe 20 is shortened to avoid interference with the pipe 17 where the heat pipe 20 passes through. The heat pipe 20 is lengthened to expand the heat transfer area at locations where the heat pipe 7 does not pass. In addition A total of four pipes 17, . . . are provided. In addition, heat pipe coolers The heating section 21 and the plurality of heat pipes 20 that are attached to one side thereof and penetrate therethrough. The cooling section 21 and each cylinder lid 14a, 15a are connected by pipes 17, 17. The cooling section 21, heat pipe 20, and piping 17, 17 are welded or brazed. It is formed as a single, sealed piece. The high temperature discharged from the low pressure cylinder 14 Compressed air enters the cooling section 21 through the pipe 17, and the heat transfer action of the heat pipe 20 After being cooled by the other cylinder lid 14a or 15, it passes through another pipe 17. Enter a.

[0016] In addition, as shown in Figure 2, the outline of the heat pipe type cooler from one direction is similar to that of the oil sump. 13 is located, and has approximately the same size as the external shape of the side surface of the crankcase 11 where the crank case 13 is located. 1, the total length in that direction is shorter than the low pressure cylinder 14 or the high pressure cylinder 15. It has been done. Furthermore, the piping 17... is connected to the side surface of the low pressure cylinder 14 and the high pressure cylinder 15. The oil in the crankcase 11 is It extends into a space surrounded by the reservoir 13, the low pressure cylinder 14, and the high pressure cylinder 15. and is connected to the cooling section 21.

[0017] In this example, a reciprocating compressor in which cylinders are arranged horizontally has been described. The idea behind this is, for example, a horizontal pair with cylinders extending from both sides of the crankcase. Applicable to reciprocating compressors.

[0018]

[Effect of the idea]

This idea uses a heat pipe cooler to downsize the intercooler and compresses it. Since this intercooler is housed within the dead space of the compressor, the overall compressor The dedicated space can be reduced, and the reciprocating compressor can be made smaller and lighter. It is also possible to shorten the piping to connect the intercooler and cylinder lid. This further facilitates weight reduction.

[Brief explanation of drawings]

FIG. 1 is a front view of a reciprocating compressor according to an embodiment of the invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view showing the positional relationship of a cylinder case, cylinders, etc. of the reciprocating compressor.

FIG. 4 is a front view of a conventional reciprocating compressor.

[Explanation of symbols]

11 Crank case 12 Crank part 13 Oil sump 14 Low pressure cylinder 15 High pressure cylinder 16 Intercooler (heat pipe cooler) 17 Piping 21 Cooling section 22 Heat pipe

Claims (1)

[Scope of utility model registration request] 1. A low-pressure cylinder and a high-pressure cylinder are horizontally extended from a position facing the crank part on a side surface of a crankcase in which a crank part and an oil reservoir are arranged vertically, and the low-pressure cylinder and high-pressure cylinder In a reciprocating compressor with an intercooler connected via piping between
The intercooler is a heat pipe type cooler having a cooling part into which compressed air is introduced, and a plurality of heat pipes having one end inserted and supported in the cooling part, and The oil sump portion of the crankcase, the low pressure cylinder, and the high pressure cylinder are made to have an outer shape that is approximately the same size as the outer shape of the side surface of the crankcase where the oil sump portion is located, and a total length in this direction that is shorter than that of the low pressure cylinder or the high pressure cylinder. 1. A reciprocating compressor, wherein the reciprocating compressor is disposed in a space surrounded by a cylinder, and the piping extends into the space from a side surface of a low-pressure cylinder and a high-pressure cylinder and is connected to the cooling section.