JP2013137219A - Exhaust gas analyzer and drain separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it hard for water collected in a gas-liquid separation chamber to enter a gas guide-out path for leading gas-liquid separated exhaust gas out to an analytical instrument, and to prevent drops of water dripping from an upper surface of the gas-liquid separation chamber from entering the gas lead-out path.SOLUTION: An exhaust gas analyzer includes a gas-liquid separation chamber 41, an exhaust gas lead-in path 42 having an exhaust gas lead-in port 42x provided on the side of one side wall 401 forming the gas-liquid separation chamber 41, an exhausts gas lead-out path 43 having an exhaust gas lead-out port 43x provided on the side of the other side wall 402 forming the gas-liquid separation chamber 41, and a drain path 44 having a drain port 44x provided to the side wall 402 forming the gas-liquid separation chamber 41 below the exhaust gas lead-out port 43x, the side of the exhaust gas lead-out port 43x of the exhaust lead-out path 43 being bent upward in the gas-liquid separation chamber 41 so that the exhaust gas lead-out port 43x is open sideward.

Description

  The present invention relates to an exhaust gas analyzer that analyzes components contained in exhaust gas such as engine exhaust gas, and more particularly to a drain separator used in the exhaust gas analyzer.

  Conventionally, in an exhaust gas analyzer that analyzes components in engine exhaust gas, as shown in Patent Document 1, before the exhaust gas is introduced into the analysis equipment constituting the exhaust gas analyzer, water vapor, water, etc. contained in the exhaust gas A drain separator for removing moisture is provided.

  Since this exhaust gas analyzer is required to have good responsiveness, the drain separator needs to improve gas replacement efficiency. For this reason, the drain separator is required to have a small capacity and high gas-liquid separation ability.

  For example, as a drain separator incorporated in a conventional exhaust gas analyzer, as shown in FIG. 5, a gas-liquid separation chamber, an exhaust gas introduction path for introducing exhaust gas into the gas-liquid separation chamber, and an exhaust gas separated from the gas and liquid There are some which are provided with an exhaust gas lead-out path for leading the gas to an analytical instrument and a drainage path for discharging the gas-liquid separated water to the outside. An exhaust gas introduction path is formed on one of the opposing side walls of the gas-liquid separation chamber, and an exhaust gas outlet path and a drainage path are formed on the other of the opposing side walls. In addition, a suction pump is provided on the downstream side of the drainage channel, and is configured to discharge water accumulated in the gas-liquid separation chamber from the drainage channel.

  And from the request | requirement of size reduction of an exhaust gas analyzer, the suction pump incorporated in the said exhaust gas analyzer is also reduced in size. When the suction pump is downsized in this way, the suction capacity of the suction pump is reduced, and the flow rate that can be drained by the drainage channel is reduced.

  Since the suction capacity of the suction pump is small in this way, if the speed at which water accumulates in the gas-liquid separation chamber is faster than the suction speed at which water is sucked from the gas-liquid separation chamber, the exhaust gas outlet passage in the gas-liquid separation chamber As a result, there is a problem that water accumulates up to the position where the gas is provided, and as a result, water enters the exhaust gas outlet passage. This problem has become particularly prominent because moisture in the exhaust gas has increased with recent improvements in engine combustion efficiency. Also, when used in a place where the ambient temperature is low, water vapor contained in the exhaust gas is condensed, and the amount of water collected in the gas-liquid separation chamber is increased compared to the case where the ambient temperature is high. However, the above problem becomes remarkable.

JP 2006-10555 A

  Therefore, the present invention has been made to solve the above-mentioned problems all at once, and makes it difficult for water accumulated in the gas-liquid separation chamber to enter the exhaust gas deriving path for deriving the gas-liquid separated exhaust gas to the analytical instrument. At the same time, it is a main intended problem to prevent water drops falling from the upper surface of the gas-liquid separation chamber from entering.

  That is, the exhaust gas analyzer according to the present invention includes a gas-liquid separation chamber that separates moisture contained in the exhaust gas, and an exhaust gas inlet provided on one side wall that forms the gas-liquid separation chamber. An exhaust gas introduction path to be introduced into the gas-liquid separation chamber, and an exhaust gas outlet provided on the other side wall forming the gas-liquid separation chamber, and analyzing the exhaust gas separated from the gas-liquid separation chamber An exhaust gas lead-out path that leads to the device, and a drain port provided below the exhaust gas lead-out port in the side wall forming the gas-liquid separation chamber, and the water separated from the gas-liquid separation chamber by the gas-liquid separation chamber The exhaust gas outlet port side of the exhaust gas outlet channel is bent upward in the gas-liquid separation chamber, and the exhaust gas outlet port is open sideways or downward. And

  In such a case, since the exhaust gas outlet port side of the exhaust gas outlet channel is bent upward in the gas-liquid separation chamber, the exhaust gas outlet port is provided above the position of the conventional exhaust gas outlet. It is possible to make it difficult for water accumulated in the gas-liquid separation chamber to enter the exhaust gas outlet passage. Further, the flow path other than the exhaust gas deriving path side of the exhaust gas deriving path, that is, the downstream side of the exhaust gas deriving path side can be configured similarly to the conventional one, and there is no need to change the piping configuration to the analytical instrument from the conventional one. Here, as a configuration that makes it difficult for water to enter the exhaust gas outlet passage, it is conceivable that the exhaust gas outlet port side of the exhaust gas outlet passage is bent upward and the exhaust gas outlet port is opened upward. There is a risk that water droplets which have condensed or adhered to the upper surface will fall and enter the exhaust gas outlet passage. In this regard, in the present invention, since the exhaust gas outlet is open sideways or downward, water droplets that are condensed or attached to the upper surface of the gas-liquid separation chamber are prevented from entering the exhaust gas outlet. Can do.

  The exhaust gas inlet is open toward the other side wall of the gas-liquid separation chamber, and the exhaust gas outlet is open in a direction along the opening direction of the exhaust gas inlet. desirable. In this case, the exhaust gas introduced into the gas-liquid separation chamber from the exhaust gas introduction path can be prevented from directly entering the exhaust gas discharge path, and the gas-liquid separation performance can be further improved. Dust contained in the exhaust gas introduced into the liquid separation chamber is likely to accumulate in the gas-liquid separation chamber, and can be less likely to enter the analytical instrument side from the exhaust gas outlet path.

  In order to realize the configuration of the present invention without changing the configuration of the drain separator built in the conventional exhaust gas analyzer, the exhaust gas outlet passage is formed on the other side wall forming the gas-liquid separation chamber. A side wall flow path, and a folded internal flow path formed by a flow path forming member attached to the gas-liquid separation chamber side opening of the side wall flow path, and one of the internal flow paths It is desirable that the opening communicates with the side wall flow path, and the other opening of the internal flow path serves as the exhaust gas outlet. If this is the case, simply attaching the flow path forming member to the side wall flow path (corresponding to a conventional exhaust gas exhaust path), the exhaust gas exhaust path side of the exhaust gas exhaust path is bent upward and the exhaust gas exhaust port faces sideward or downward. It can be constituted as follows.

  In order to improve the gas-liquid separation performance by preventing the water scattered by the exhaust gas flowing into the gas-liquid separation chamber from entering the exhaust gas outlet passage, in front of the exhaust gas inlet in the gas-liquid separation chamber It is desirable that an intrusion prevention plate is provided for preventing water scattered by the exhaust gas flowing in from the exhaust gas introduction path from entering the exhaust gas outlet path. In addition, it becomes easy to separate the moisture contained in the exhaust gas from the exhaust gas when the exhaust gas hits the intrusion prevention plate.

  A block forming the gas-liquid separation chamber is divided into a first block element including the one side wall and a second block element including the other side wall, and the exhaust gas introduction path is formed in the first block element. The side wall channel and the discharge channel are formed in the second block element, and the channel is formed in the gas-liquid separation chamber side opening of the side wall channel formed in the second block element. It is desirable that the member be attached. In this case, the number of parts of the drain separator of the exhaust gas analyzer can be reduced as much as possible, and the flow path forming member is attached to the second block element in a state where the first block element and the second block element are separated. Thereafter, the first block element and the second block element may be overlapped, so that assembly is easy.

  According to the present invention configured as described above, the exhaust gas outlet port side of the exhaust gas outlet passage is bent upward, and the exhaust gas outlet port opens sideways or downward, so that the gas-liquid separation chamber can It is possible to make it difficult for water collected in the gas-liquid separation chamber to enter the exhaust gas outlet passage for leading the separated exhaust gas to the analytical instrument, and to prevent water droplets falling from the upper surface of the gas-liquid separation chamber from entering. The response speed of measurement can be secured at the same time.

The schematic diagram which shows the structure of the exhaust gas analyzer of this embodiment. The longitudinal cross-sectional view which shows the structure of the drain separator of the same embodiment. The figure which looked at the drain separator of the embodiment from the exhaust gas introduction path side. The longitudinal cross-sectional view which shows the structure of the flow-path formation member which concerns on deformation | transformation embodiment. The longitudinal cross-sectional view which shows the structure of the conventional drain separator.

  Hereinafter, an exhaust gas analyzer 100 according to the present invention will be described with reference to the drawings.

  The exhaust gas analyzer 100 of the present embodiment directly introduces engine exhaust gas discharged from an engine and analyzes a component to be measured contained in the exhaust gas. The exhaust gas analyzer 100 is a small-sized integrated drain separator and analysis instrument. This is an exhaust gas analyzer.

  Specifically, as shown in FIG. 1, this is provided in an exhaust pipe of an automobile, and a sampling probe 2 for sampling engine exhaust gas (hereinafter referred to as exhaust gas) discharged from the exhaust pipe, and the sampling probe 2, an oil catcher 3 that removes oil and the like from the exhaust gas, and a gas-liquid separator (hereinafter referred to as a drain separator) 4 that removes moisture contained in the exhaust gas that has passed through the oil catcher 3. I have. The oil catcher 3 and the drain separator 4 are connected by an introduction line L0.

  And it branches to the drain line L2 which discharges the water removed by the measurement line L1 and the drain separator 4 which guide exhaust gas from the drain separator 4 to the analytical instrument 6.

  The measurement line L1 analyzes a dust collection filter 5 that removes dust contained in the exhaust gas separated into gas and liquid by the drain separator 4 and a predetermined measurement target component contained in the exhaust gas that has passed through the dust collection filter 5. An analytical instrument 6 is provided. Further, a suction pump 7 is provided between the dust collection filter 5 and the analytical instrument 6 in the measurement line L1 to flow exhaust gas through the measurement line L1, and between the dust collection filter 5 and the suction pump 7, An air supply line L <b> 3 for introducing air to purge and zero calibrate the analytical instrument 6 is connected via a three-way solenoid valve 8. A pressure sensor 9 is provided between the three-way solenoid valve 8 and the suction pump 7. The air supply line L3 is provided with a dust collection filter 10 that removes dust contained in the air. Further, a calibration gas line L4 for introducing a calibration gas and performing span calibration of the analytical instrument 6 is connected between the suction pump 7 and the analytical instrument 6 in the measurement line L1. The calibration gas line L4 is provided with a decompressor 11 made of ceramic hollow particles or the like. The drain line L <b> 2 is provided with a filter 12 for filtering the water separated by the drain separator 4 and a suction pump 13 for discharging the water separated by the drain separator 4.

  As shown in FIG. 2, the drain separator 4 includes a gas-liquid separation chamber 41 that separates moisture such as water vapor and / or water contained in the exhaust gas, and one side wall 401 (described later) that forms the gas-liquid separation chamber 41. The exhaust gas inlet 42x provided on the first block element 4A) side has an exhaust gas introduction path 42 for introducing exhaust gas into the gas-liquid separation chamber 41, and the other side wall 402 (described later) forming the gas-liquid separation chamber 41. An exhaust gas outlet 43x provided on the second block element 4B) side of the exhaust gas, and an exhaust gas outlet passage 43 for guiding the exhaust gas separated by the gas-liquid separation chamber 41 to the analytical device 6; and the gas-liquid separation chamber 41 The other side wall 402 that forms a gas outlet has a drain port (drain port) 44x provided below the exhaust gas outlet port 43x, and discharges water separated by the gas-liquid separation chamber 41 to the outside. Drainage And a (drainage path) 44. In this embodiment, one side wall 401 and the other side wall 402 are side walls facing each other. Further, the drain port 44x is provided near the bottom surface of the other side wall 402.

  Specifically, the drain separator 4 is composed of a metal block having high thermal conductivity, such as aluminum or copper, and the first block element 401 and the second block divided into two to form the gas-liquid separation chamber 41. It has element 4B. The first block element 4 </ b> A is provided to extend outward from the front surface of the casing C of the exhaust gas analyzer 100. On the other hand, the second block element 4 </ b> B is arranged inside the casing C of the exhaust gas analyzer 100.

  The first block element 4 </ b> A has a recess 4 </ b> A <b> 1 that forms a gas-liquid separation chamber 41, and an exhaust gas introduction path 42 is formed inside, and a plurality of radiation fins radially around the exhaust gas introduction path 42. F1 is formed (see FIG. 3). The bottom wall of the recess 4A1 serves as one side wall 401 that forms the gas-liquid separation chamber 41 described above. The exhaust gas introduction passage 42 is a straight passage, and an upstream end 42u thereof is connected to an introduction pipe H1 constituting an introduction line L0 for introducing the exhaust gas sampled by the sampling unit 2. Is done. Further, the plurality of radiating fins F <b> 1 are formed along the flow path direction of the exhaust gas introduction path 42. By providing a plurality of heat dissipating fins F1, heat from the exhaust gas transmitted to the first block element 4A is dissipated to the outside and cooled, and water vapor in more exhaust gas is changed from gas to liquid. Yes.

  The second block element 4 </ b> B has a recess 4 </ b> B <b> 1 that forms a gas-liquid separation chamber 41, and a side wall channel 431 that constitutes the exhaust gas outlet channel 43 is formed inside, and below the side wall channel 431. A drainage channel 44 is formed in parallel with the side. The bottom wall of the recess 4B1 becomes the other side wall 402 that forms the gas-liquid separation chamber 41 described above. The side wall channel 431 is a straight channel, and a downstream end 431d thereof is connected to a lead-out pipe H2 that constitutes a measurement line L1 for leading the exhaust gas to the analytical instrument 6. . The drainage channel 44 is a linear channel, and a downstream end 44d thereof is connected to a discharge pipe H3 constituting a drain line L2 for discharging drain water to the outside. In addition, in the side wall (the other side wall 402) in the second block element 4B, a recess 4B2 for increasing the internal volume of the gas-liquid separation chamber 41 as much as possible between the side wall channel 431 and the drainage channel 44. Is formed. Further, in the second block element 4B, a plurality of radiating fins F2 are formed radially around the side wall channel 431, similarly to the first block element 4A. The plurality of radiating fins F <b> 2 are formed along the channel direction of the side wall channel 431. By providing a plurality of radiating fins F2, heat from the exhaust gas transmitted to the second block element 4B is radiated to the outside and cooled, and the water vapor in more exhaust gas is changed from gas to liquid. Yes.

  Further, an upstream end (gas-liquid separation chamber side opening) 431u of the side wall channel 431 protrudes from the side wall (the other side wall 402) of the second block element 4B. The upstream end 431u of the side wall channel 431 is provided to face the exhaust gas inlet 42x formed on the side wall (one side wall 401) in the first block element 4A. The flow path forming member 4C is attached to the upstream end 431u.

  This flow path forming member 4C is made of, for example, a resin, and forms an internal flow path 432 that constitutes an exhaust gas outlet path 43 that is bent so as to be curved in a substantially U shape, as shown in FIG. Yes. The exhaust gas outlet passage 43 is constituted by the internal passage 432 and the side wall passage 431. In addition, one end side of the internal flow path 432 functions as a mounting portion that is mounted in close contact with the outer peripheral surface of the upstream end portion 431u of the side wall flow path 431.

  Then, with one end of the internal channel 432 attached to the upstream end 431 u of the side wall channel 431, the one end opening of the internal channel 431 communicates with the side liquid channel 431, and the other of the internal channel 432 An end side (upper end side) opening is an exhaust gas outlet 43x. That is, the exhaust gas outlet 43 x side of the exhaust gas outlet passage 43 is bent upward in the gas-liquid separation chamber 41 by mounting the flow path forming member 4 </ b> C on the upstream end 431 u of the side wall passage 431. In addition, the upper end side opening (exhaust gas outlet 43x) of the internal flow path 432 is positioned above the upstream end 431u of the side wall flow path 431. Furthermore, the upper end side opening (exhaust gas outlet 43x) of the internal flow path 432 opens toward a side or a direction slightly inclined downward from the side. In the present embodiment, the exhaust gas outlet 43x is formed so as to face substantially the same direction as the opening direction of the exhaust gas inlet 42x, that is, the other side wall 402 (second block element 4B) side. This makes it difficult for dust contained in the exhaust gas introduced from the exhaust gas inlet 42x to enter the exhaust gas outlet 43x. The opening direction of the exhaust gas inlet 42x is the direction facing the other side wall 402 of the gas-liquid separation chamber 41.

  Further, in the present embodiment, an infiltration preventing plate that prevents water scattered by the exhaust gas exhaust flowing in from the exhaust gas introduction path 42 from entering the exhaust gas outlet path in front of the exhaust gas inlet 42x in the gas-liquid separation chamber 41. 45 is provided. The intrusion prevention plate 45 is provided so as to cover the exhaust gas inlet 42x, and in this embodiment, is fixed to the side wall (one side wall 401) of the first block element 4A by screws. The intrusion prevention plate 45 can prevent the exhaust gas flowing from the gas introduction path 42 and the moisture contained in the exhaust gas from entering the gas outlet path 42 as they are, thereby improving the gas-liquid separation performance. Further, when the exhaust gas flowing in from the gas introduction path 42 hits the intrusion prevention plate 45, water contained in the exhaust gas is easily separated from the exhaust gas. Furthermore, since the intrusion prevention plate 45 exhibits a function of blocking water accumulated in the gas-liquid separation chamber 41, it is possible to make it difficult for water accumulated in the gas-liquid separation chamber 41 to enter the gas outlet passage 42.

  The first block element 4A and the second block element 4B configured as described above are configured so that the outer peripheral wall of the recess 4A1 in the first block element 4A after the flow path forming member 4C is attached to the second block element 4B. And after fixing sealing member 4D, such as an O-ring, between the outer peripheral walls of recessed part 4B1 in 2nd block element 4B, it fixes with a screw. In this way, the drain separator 4 is assembled. The drain separator 4 assembled in this way connects the outlet pipe H2 to the downstream end 431d of the exhaust gas outlet passage 43 of the second block element 4B, and connects the drain pipe H3 to the downstream end 44d of the drain passage 44. Connected and accommodated in casing C.

  According to the exhaust gas analyzer 100 according to the present embodiment configured as described above, the exhaust gas outlet 43x side of the exhaust gas outlet passage 43 is bent upward in the gas-liquid separation chamber 41. The position can be provided above the position of the conventional exhaust gas outlet, and the water accumulated in the gas-liquid separation chamber 41 can be made difficult to enter the exhaust gas outlet passage 43. In addition, since the exhaust gas outlet 43x opens sideways, it is possible to prevent water droplets that have condensed or adhered to the upper surface of the gas-liquid separation chamber 41 from entering the exhaust gas outlet passage 43. Furthermore, since the exhaust gas lead-out path 43 is bent upward using the flow path forming member 4C, the configuration other than the flow path forming member 4C does not need to be changed from the configuration of the conventional exhaust gas analyzer.

  The present invention is not limited to the above embodiment.

  For example, in the above embodiment, the exhaust gas outlet 43x opens substantially sideways, but may be configured to open obliquely downward such as 45 degrees or vertically downward. .

  Further, the flow path forming member 4C of the above embodiment has the internal flow path 432 that is bent in a substantially U shape, but as shown in FIG. 4, it is bent in a generally U shape. It may have an internal flow path 432 having a formed shape.

  Furthermore, it is possible to further prevent intrusion into the water droplets by providing a collar on the upper side of the gas outlet port 43x that opens to the side. In the said embodiment, it is possible to provide a collar part integrally in the upper part of upper end side opening in 4 C of flow-path formation members.

  Furthermore, the opening direction of the gas outlet port 43x of the above embodiment is not limited to the direction of opening along the opening direction of the gas inlet port 42x, but the opening of the gas outlet port 43x is as viewed from the gas inlet port 42x. You may comprise so that it may not be visible. That is, you may comprise so that the opening direction of the exhaust gas outlet 43x may face the other side wall 402 side in the direction orthogonal to the opening direction of the gas inlet 42x. If this is the case, the exhaust gas introduced into the gas-liquid separation chamber 41 from the exhaust gas introduction passage 42 can be prevented from directly entering the exhaust gas outlet passage 43 to further improve the gas-liquid separation performance, and the exhaust gas introduction passage. It is possible to make it difficult for dust contained in the exhaust gas introduced from 42 to the gas-liquid separation chamber 41 to enter the analytical instrument 6 side from the exhaust gas outlet passage 43. In addition, the above effect can be achieved by simply disposing the gas inlet 42x and the gas outlet 43x so as not to face each other.

  In addition, in the above embodiment, the drain separator 4 is constituted by the first block element 4A, the second block element 4B, and the flow path forming member 4C, but in addition, the gas-liquid separation chamber 41, the exhaust gas introduction path 42, the exhaust gas Each of the lead-out channel 43 and the drainage channel 44 may be constituted by separate members.

  In addition, in the above-described embodiment, the one side wall 401 and the other side wall 402 are the side walls facing each other. However, the side walls may be different from each other such as the side walls adjacent to each other.

  In addition, in the above-described embodiment, an example in which the exhaust gas outlet 43x and the drain port 44x are provided on the same side wall (the other side wall 402) side is shown, but the drain port 44x has the exhaust gas outlet port 43x and the exhaust gas inlet port. As long as the position is lower than 42x, it may be provided on any side wall.

  Further, as an aspect in which the exhaust gas outlet port side of the exhaust gas outlet path is bent upward, it may be bent vertically upward as in the above-described embodiment, or may be bent obliquely upward inclined from the vertical upper side.

  Further, in FIG. 1, the suction pumps 7 and 13 are provided in the measurement line L1 and the drain line L2, respectively. However, by providing one suction pump on the downstream side of the confluence of the exhaust of the measurement line L1 and the drain line L2, measurement is performed. The line L1 and the drain line L2 may be sucked by the same suction pump. In this case, since the suction force of the drain line L2 by the suction pump is reduced and the flow rate that can be drained is reduced, and water is easily collected in the gas-liquid separation chamber 41, the effect of the present invention becomes more remarkable.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Exhaust gas analyzer 4 ... Drain separator 41 ... Gas-liquid separation chamber 401 ... One side wall 42 ... Exhaust gas introduction path 42x ... Exhaust gas inlet 402 ... Other side wall 43 ... exhaust gas outlet passage 43x ... exhaust gas outlet port 431 ... side wall channel 432 ... internal channel 44 ... drain channel 44x ... drain port 4A ... first block element 4B Second block element 4C: flow path forming member 6: analytical instrument

Claims (5)

A gas-liquid separation chamber for separating moisture contained in the exhaust gas;
An exhaust gas introduction passage provided on one side wall side forming the gas-liquid separation chamber, and introducing the exhaust gas into the gas-liquid separation chamber;
An exhaust gas outlet having an exhaust gas outlet provided on the side of the other side wall forming the gas-liquid separation chamber, and leading the exhaust gas gas-liquid separated by the gas-liquid separation chamber to an analytical instrument;
A drainage passage provided on a side wall forming the gas-liquid separation chamber below the exhaust gas outlet, and a drainage channel for discharging water separated by the gas-liquid separation chamber to the outside. ,
An exhaust gas analyzer in which an exhaust gas outlet port side of the exhaust gas outlet channel is bent upward in the gas-liquid separation chamber, and the exhaust gas outlet port opens sideways or downward. The exhaust gas inlet is open toward the other side wall of the gas-liquid separation chamber;
The exhaust gas analyzer according to claim 1, wherein the exhaust gas outlet port opens in a direction along an opening direction of the exhaust gas inlet port. The exhaust gas outlet passage is bent by a side wall channel formed on the other side wall forming the gas-liquid separation chamber and a channel forming member attached to the gas-liquid separation chamber side opening of the side wall channel. An internal flow path having a defined shape,
The exhaust gas analyzer according to claim 1 or 2, wherein one opening of the internal flow path communicates with the side wall flow path, and the other opening of the internal flow path serves as the exhaust gas outlet. A block forming the gas-liquid separation chamber is divided into a first block element including the one side wall and a second block element including the other side wall;
The exhaust gas introduction path is formed in the first block element, the side wall flow path and the discharge path are formed in the second block element, and the air flow of the side wall flow path formed in the second block is further increased. The exhaust gas analyzer according to claim 3, wherein the flow path forming member is attached to the liquid separation chamber side opening. A drain separator used in an exhaust gas analyzer,
A gas-liquid separation chamber for separating moisture contained in the exhaust gas;
An exhaust gas introduction passage provided on one side wall side forming the gas-liquid separation chamber, and introducing the exhaust gas into the gas-liquid separation chamber;
An exhaust gas outlet having an exhaust gas outlet provided on the side of the other side wall forming the gas-liquid separation chamber, and leading the exhaust gas gas-liquid separated by the gas-liquid separation chamber to an analytical instrument;
A drainage passage provided on a side wall forming the gas-liquid separation chamber below the exhaust gas outlet, and a drainage channel for discharging water separated by the gas-liquid separation chamber to the outside. ,
A drain separator in which the exhaust gas outlet port side of the exhaust gas outlet channel is bent upward in the gas-liquid separation chamber, and the exhaust gas outlet port opens sideways or downward.