JPH11107950A - Injection device of compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify structure to miniaturize a device and reduce a dead vol ume by nipping a valve seat having a reed valve for opening and closing an inlet port to a check valve chamber from its inner side between the outer sur face of a fixing member and a block, and providing a valve stopper for the reed valve in a part of the check valve chamber. SOLUTION: This injection device has a simple structure in which a valve seat 54b between a fixed scroll 11 forming a compression chamber 13 and a block 82 touched thereto, and a valve stopper 88 as the contact of the reed valve 54a. The dead volume formed by an injection passage from a check valve 54 to the compression chamber 13 is minimized. Since the quantity of a coolant present therein or a lubricating oil penetrated thereto is minimized, the influence can be minimized even if the coolant or lubricating oil within the dead volume is re-swollen, and the efficiency and performance of a compression in a low-load operation can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for a compressor in which a fluid to be compressed is injected into various compressors so as to supercharge the fluid to be compressed, and is mainly used for refrigeration and air conditioning for business and home use. The present invention relates to an injection device for a compressor to be used.

[0002]

2. Description of the Related Art Electric compressors for refrigeration and air conditioning include those having a reciprocating compressor, a rotary compressor and a scroll compressor. Currently, it is growing by making use of its features in terms of cost and performance. Among them, scroll type compressors have been put to practical use taking advantage of the features of high efficiency, low noise, and low vibration.

[0003] Japanese Patent Application Laid-Open No. 08-144971 discloses a non-return valve for supplying intermediate-pressure refrigerant gas separated by a gas-liquid separator to a compression chamber formed between a fixed scroll and an orbiting scroll in a scroll compressor. Injecting through, utilizing the gradual compression characteristic of scroll compressors,
A device that realizes stable and efficient gas injection is disclosed.

[0004]

However, in the conventional scroll compressor, the check valve for gas injection is provided so as to cover the outer peripheral surface of the end plate of the fixed scroll and the space for discharging refrigerant from the end plate. Since the structure is provided in the middle of the injection pipe connected to the rear housing, the path from the check valve to the compression chamber is complicated and long, and the injection device is complicated and large, and it is difficult to manufacture and the cost is high. In addition, a dead volume formed by a complicated and long injection path increases the amount of lubricating oil that penetrates and becomes difficult to remove even by gas injection, so that lubrication becomes unstable and performance becomes unstable.

Further, since the compression in the compression chamber extends to the dead volume up to the check valve position in the injection path, if the dead volume is long and large, the compression efficiency is affected, and high speed operation such as heating is required. When gas injection is stopped for diversification of operation such as switching from low-load operation to low-load operation such as cooling operation to low-speed operation, refrigerant or lubricating oil in this dead volume is transferred to the compression chamber in the compression process. After the pressure is increased through the compressor, the refrigerant expands again when the compressor communicates with the next compression chamber which starts closing, so that the larger the dead volume, the more likely the performance and efficiency of the compressor are reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compressor injection which has a simple structure, has a small apparatus and a small dead volume, is inexpensive, and can prevent problems due to re-expansion of a fluid to be compressed and lubricating oil and a large amount of lubricating oil entering. It is to provide a device.

[0007]

The closed space is reduced by the displacement of the compression chamber from the suction position to the discharge position, and the fluid sucked at the suction position is compressed and discharged to the outside at the discharge position. In order to achieve the above object, in the injection device of a compressor for injecting a fluid to be compressed through a check valve, the present invention provides a fixing member forming a compression chamber with a substantially wall thickness from the outer surface side to the compression chamber. An injection port penetrating in the direction is provided, and a block to which an injection pipe is connected is applied to an outer surface corresponding to the injection port of the fixed member to form a check valve chamber between the fixed member and the injection port. A valve seat having a reed valve for opening and closing the inlet from the pipe to the check valve chamber from the inside thereof is formed between the outer surface of the fixing member and the block. The reed valve valve stopper is a single, characterized in that provided in a part sandwiched, said check valve chamber between.

In such a configuration, when the injection is performed, the reed valve is pushed open by the injection pressure so that the injection is achieved, and when the injection is not performed, the reed valve is closed by its own restoring force or when the injection valve is closed. The fluid pressure due to the compression in the compression chamber is applied to increase the closing force, and the compressed fluid in the compression chamber is prevented from escaping beyond the check valve to the side of the injection pipe, exhibiting a check valve function, and the compression is performed. Can be achieved.

The present invention separately provides an inlet from an injection pipe connected to the outer surface of a fixing member forming a compression chamber, and an injection for guiding an injection fluid from the inlet to the compression chamber in a substantially wall thickness direction. A non-return valve chamber is formed between the non-return valve and the port, and a free valve is provided in the non-return valve chamber to slide between an inlet surface where the inlet port opens and an outlet surface where the injection port opens. Injection of the outlet face from the inlet face side of the check valve chamber between the sliding contact surface between the outer circumference of the valve and the inner circumference of the check valve chamber and between the opposing faces where the reed valve and the outlet face abut each other. It is also characterized in that a fluid passage which partially communicates with the opening of the port and which does not communicate with the opening of the inlet is formed between the opposing surfaces where the free valve and the inlet surface abut.

In such a configuration, the inlet face side and the outlet face side of the check valve chamber are formed by a fluid passage provided between a free valve and a sliding contact face between the check valve chamber and a partition therebetween. It is only partially connected, and the dynamic pressure when the injection fluid flows into the check valve chamber through the inlet at the time of injection acts on the free valve and presses the free valve against the outlet surface. Since the fluid passage provided between the surfaces communicates with the fluid passage and the injection port opened on the outlet surface, the injection fluid can be guided to the compression chamber through the injection port to the compression chamber with a predetermined passage resistance. Achieved as set. When the injection is not performed, the fluid sucked into the compression chamber and compressed also reaches the check valve chamber through the injection port, and the dynamic pressure presses the free valve against the inlet surface, so that the two opposing surfaces are in contact with each other. The fluid passage and the inlet from the injection pipe that opens at the inlet face are not in contact with each other, and the fluid to be compressed is prevented from escaping to the injection pipe side beyond the check valve to achieve the compression. You can do so.

In this case, when the check valve chamber and the free valve have a circular cross section and the ratio L / D of the diameter D to the thickness L of the free valve is 0.3 or more, the injection of the free valve is performed. The response of opening and closing when performing and not performing is easily improved.

In particular, these injection devices are different in opening and closing form from each other, but all of them are simple and small with a small number of parts, and are easy to manufacture and inexpensive.

In addition, the dead volume formed by the injection path from the check valve to the compression chamber becomes small,
Since the amount of refrigerant and lubricating oil that has entered here decreases, diversification of the operation of the refrigeration compressor performs gas injection during high-load operation such as during heating, and performs gas injection during low-load operation such as during cooling. In such a case, even if the refrigerant or the lubricating oil in the dead volume re-expands, the effect can be reduced and the efficiency and performance of the compressor at low load operation can be improved. . Further, since the amount of lubricating oil entering the dead volume is small even if it enters the dead volume, it is possible to reduce a decrease in lubricity of the sliding portion of the compression mechanism and prevent a decrease in performance.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) Embodiment 1 is an example in which a horizontally mounted scroll compressor for refrigeration and air conditioning is used, and FIG. 1 shows the configuration of a main part.

To explain this, a scroll-type compression mechanism 2 is provided at one end, an electric motor 3 for driving the compression mechanism 2 at an intermediate portion, and a closed vessel 1 is provided at the other end.
And an oil pump 6 for sending out the oil 4 in the oil reservoir 5 at the lower part of the oil reservoir to the lubrication target part.

The compression mechanism 2 includes the end plate 1 of the fixed scroll 11.
The blade 11a rising from 1d and the orbiting scroll 1
The pair of compression chambers 13 formed between the two end plates 12d rising from the second end plate 12d are engaged with each other in the same manner as in the related art, and the orbiting scroll 12 is driven to rotate in a circular orbit without rotating. 1. A suction port 14 provided in the end plate 11d of the fixed scroll 11 shown in FIG.
The end plate 11d of the fixed scroll 11 from the outer peripheral side leading to
While moving to the center side which communicates with the discharge port 15 provided in the container, the closed volume is reduced and compression is performed to discharge.

The support and drive and the structure for guiding the fluid to be sucked, compressed and discharged in the closed vessel 1 may be configured in any manner. Further, the oil pump 6 may be of any type. In the first embodiment, the compression mechanism 2 is integrated with the main bearing member 9 fixed to one end side by bolting the fixed scroll 11 to the main bearing member 9.
The orbiting scroll 12 meshed with the fixed scroll 11 is sandwiched between the fixed scroll 11 and the fixed scroll 11. The electric motor 3 includes an annular stator 3a fixed to the closed container 1 by welding or the like, and a rotor 3b disposed inside the stator 3a.
A crankshaft 16 for orbiting the orbiting scroll 12 of the compression mechanism 2 is fixed to the rotor 3b.

The crankshaft 16 is supported at the other end of the sealed container 1 by an auxiliary bearing member (not shown) fixed to the sealed container 1 by welding or the like, and the main shaft 18 on the opposite side is supported by the main bearing member 9. I have. The auxiliary bearing member and the main bearing member 9 have a slide bearing 21 and the like for the bearing. The main shaft 18 is fitted with a revolving shaft 12b protruding to an eccentric position on the back surface of the end plate 12d of the revolving scroll 12 via an eccentric bearing 23 held so as to be able to reciprocate on the diameter line of the main shaft 18, and when the main shaft 18 is rotated, The cooperation of the Oldham ring 28 provided between the bearing member 9 and the orbiting scroll 12 causes the orbiting scroll 12 to orbit so as to make a circular orbital motion without rotating with respect to the fixed scroll. However, the bearing structure as described above can be variously modified.

Since the first embodiment is a scroll compressor for refrigeration and air conditioning, suction by a compression mechanism 2 is performed.
The fluid to be compressed and discharged is a refrigerant, and especially when using a refrigerant containing no chlorine, for example, a hydrogen fluoride-carbon-based refrigerant, an oil 4 compatible with the refrigerant is used. Even if this is not the case, the oil 4 is compatible with the oil 4 and is carried by the refrigerant to the mechanically slidable parts of each part in the closed container 1, thereby improving lubricity.

A gas suction pipe 32 is connected to the suction port 14, and a gas discharge pipe (not shown) on the side opposite to the gas suction pipe 32 is connected to the discharge port 15.
It is connected through the upper refrigerant passage 33.

The oil pump 6 is driven by the crankshaft 16 together with the compression mechanism 2, sends out the oil 4 in the oil reservoir 5 to an oil passage 35 formed vertically through the crankshaft 16, and first supplies the oil to the eccentric bearing 23. Eccentric bearing 2
A part of the oil 4 after being supplied to the oil passage 3 is supplied to the sliding bearing 22 and the compression mechanism 2 through gaps and predetermined passages of the respective parts, and the rest is returned to the oil reservoir 5 below.

Further, the discharge port 15 is provided with a check valve 42 for preventing the orbiting scroll 12 from rotating backward when the compression mechanism 2 is stopped, and a check valve stopper 43 for restricting the movement of the orbiting scroll 12. .

Between the gas discharge pipe 34 and the gas suction pipe, equipment for a refrigerating mechanism such as a condenser (not shown), an expansion valve, a gas-liquid separator 46 (not shown), a capillary tube (not shown), and an evaporator. Are sequentially connected, and constitute a heat pump type refrigeration cycle in which the whole including the compression mechanism 2 in the closed vessel 1 is connected in a ring shape, so that low-load cooling and high-load heating can be performed. It is assumed that a switching structure (not shown) is provided.

The end plate 11d of the fixed scroll 11 is provided with an injection port 51 for performing gas injection into the pair of compression chambers 13 as shown in FIGS. An injection pipe 52 is connected to the injection port 51 via a check valve 54, and a gas refrigerant supply pipe 53 from the gas-liquid separator 46 is connected to the injection pipe 52. As a result, the gas refrigerant in the gas phase separated by the gas-liquid separator 46 in the compression chamber 13 is supplied with the refrigerant supply pipe 53, the injection pipe 52, and the injection port 51.
The check valve 54 prevents the backflow of the refrigerant once injected. Since such gas injection increases the efficiency of the compressor in the compression mechanism 2, the heating capacity is improved accordingly.

In accordance with the diversification of the operation of the refrigeration system, the gas injection may be performed in a timely manner according to the operation state of the refrigeration system. Is provided with a two-way solenoid valve 56, which is controlled to be opened and closed as needed along with the operation of the refrigeration system. This control can be performed by a microcomputer together with the operation control of the refrigerating apparatus, for example, but is not limited to this. Also, for diversification of driving,
In the present embodiment, in addition to the heat pump type which can also be used for cooling and heating, the orbiting scroll 12 can be driven to rotate at a variable speed by controlling the electric motor 3 by, for example, an inverter.

In particular, in the first embodiment, the outer surface of the fixed scroll 11, which is a fixed member forming the compression chamber 13, is preferably a wall substantially extending from the rear side of the end plate 11d to the compression chamber 13. An injection port 51 penetrating in the thickness direction is provided, and a block 82 to which an injection pipe 52 is connected is applied to a back surface as an outer surface corresponding to the injection port 51 of the fixed scroll 11 as a fixed member. In the meantime, as one embodiment shown in FIGS. 1 and 2A, a check valve chamber 57 is formed by cutting a part of the end plate 11d.
Depending on the case, the side of the block 82 may be formed, or both sides may be formed. However, drilling on only one side makes processing easier, and one side is fixed to the fixed scroll 11.
If it is provided on the side of the fixing member, it is provided without bulk using the normal volume.

FIG. 2B shows a reed valve 54a for opening and closing an inlet 85 from the injection pipe 52 of the block 82 to the check valve chamber 57 from the inside. A valve seat 54b is provided between the rear surface, which is the outer surface of the fixed scroll 11, and the block 82.
As shown in FIG. 1 and FIG. 2 (a), it is sandwiched and fixed by fastening with bolts 81 as shown in FIG. 2 (a) and seals the check valve chamber 57. Closed to state. If necessary for this seal,
1d and the valve seat 54b, and the block 82
A sealing material may be interposed between the valve member and the valve seat 54a. The injection pipe 52 is connected to the injection nozzle 87 for the block 82 and indirectly connected to the block 82. However, the invention is not limited to this. For example, a resin bush for increasing the thermal resistance may be directly connected to the block 82. The connection can also be made by press-fitting.

Further, a portion of the check valve chamber 57, a portion on the side of the end plate 11d opposite to the end portion 54a1 for closing the introduction port 85 of the reed valve 54a, is used as a contact for regulating the maximum opening position of the reed valve 54a. Is integrally formed, for example. When the end plate 11d is made of aluminum or the like having low wear resistance,
It is formed of a separate member made of an iron-based material having high wear resistance, provided by an appropriate method such as adhesion, brazing, screwing, etc., and is maintenance-free as in the case where the compression mechanism 2 is housed in the closed container 1. May be adapted.

In such an injection device, when the injection is performed, the reed valve 54a is pushed and opened by the injection pressure so that the injection is achieved, and when the injection is not performed, the reed valve 54a is closed by its own restoring force, or The fluid pressure due to the compression in the compression chamber 13 is applied thereto, and the closing force is increased, and the compressed fluid in the compression chamber 13 is prevented from escaping beyond the check valve to the side of the injection pipe 52, and the check valve function is performed. And the compression can be achieved.

Moreover, the injection device according to the first embodiment only needs to provide the valve seat 54b between the fixed scroll 11 which is an example of the fixed member forming the compression chamber 13 and the block 82 applied to the fixed scroll 11. Alternatively, in the fixed scroll 11, the reed valve 54a of the valve seat 54b opens and closes an inlet 85 from the injection pipe 52 which is open to the check valve chamber 57, and the inlet 85
When the fluid is opened, the fluid flowing from the inlet 85 is compressed.
A space for the injection port 51 communicating with the opening 3 to flow from the opening is provided, and a valve stopper 88 serving as a contact with the reed valve 54a only needs to be partially provided. Therefore, the number of parts is simple, small, and easy to manufacture. It will be cheap.

Further, since the dead volume formed by the injection path from the check valve 54 to the compression chamber 13 is also reduced, the amount of the refrigerant and the lubricating oil entering there is reduced. Due to diversification, when gas injection performed at high load operation such as heating is not performed at low load operation such as cooling, the refrigerant and lubricating oil in the dead volume may re-expand. However, the effect can be reduced, and the efficiency and performance of the compressor at low load operation can be improved. Further, since the amount of lubricating oil entering the dead volume is small even if it enters the dead volume, it is possible to reduce a decrease in lubricity of the sliding portion of the compression mechanism 2 and prevent a decrease in performance.

The valve seat 54b is made of a spring steel plate, and the reed valve 54a formed by punching is simple in structure and manufacture, and can satisfy durability. However, without being limited to this,
It can be replaced with another member having elastic restoring force.

(Embodiment 2) This embodiment 2 is similar to FIG.
As shown in FIG. 1, the basic structure is the same as that of the first embodiment shown in FIG.
In this case, the same members are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 3, an inlet 85 from the injection pipe 52 connected to the back of the fixed scroll forming the compression chamber 13, and an injection gas from the inlet 85 is substantially supplied to the compression chamber 13. The check valve chamber 5 is located between the injection port 51 leading in the wall thickness direction and the injection port 51.
7, a free valve 54 that slides between an inlet face 57a where the inlet 85 opens and an outlet face 57b where the injection port 51 opens inside the check valve chamber 57.
c is provided. The degree of fitting between the free valve 54c and the check valve chamber 56 depends on the dynamic pressure of the gas refrigerant due to the injection from the injection pipe 52 by the free valve 54c and the dynamic pressure of the refrigerant due to the compression in the compression chamber 13 and the rattling or twisting occurs. It is good to have a smooth fit without any gap.

As shown in FIGS. 3 and 4, (a) and (b), the sliding contact surface between the outer periphery of the free valve 54c and the inner periphery of the check valve chamber 57, the reed valve 54c and the outlet Face 57
b between the opposing surfaces of the check valve chamber 57 and the opening of the injection port 51 of the outlet surface 57b, and the free valve 54c and the inlet surface 57a abut each other. A fluid passage 92 that does not communicate with the opening of the introduction port 85 is formed between the opposed surfaces.

In one embodiment shown in FIGS. 3 and 4 (a) and (b), the check valve chamber 57 and the free valve 54c are circular in cross section, and the outer periphery of the free valve 54c and the check valve chamber are connected. The fluid passage 92 between the sliding contact surface with the inner periphery of the notch 57 is formed by cutout surfaces 54c1 provided on both sides of the side peripheral surface of the free valve 54c.
And the fluid passage 92 between the opposing surfaces where the free valve 54c and the inlet surface 57a are in contact with each other is formed by a groove 54c2 formed on the end surface of the free valve 54c. However, the present invention is not limited to this.
4c1, the groove 54c2 is only one place in the circumferential direction, that is,
There may be only half of the case shown, or there may be more than two. In addition, partial recesses such as the cutout surface 54c1 and the groove 54c2 for forming the fluid passage 92 may be provided on the check valve chamber 57 side, or may be provided on both the free valve 54c and the check valve chamber 57. You may share and provide. It is sufficient that the check valve function and the predetermined injection flow rate are guaranteed.

In this way, the inlet face 57a and the outlet face 57b of the check valve chamber 57 are provided between the sliding contact surface of the free valve 54c and the check valve chamber 57 that partition them. Only when the injection refrigerant flows into the check valve chamber 57 through the inlet 85 at the time of injection, the dynamic pressure acts on the free valve 54c to move the free valve 54c to the outlet surface 57b. The fluid passage 92 provided between the surface facing the outlet surface 57b and the fluid passage 92.
And the injection port 51 opened to the outlet surface 57b, so that the injection pipe 5
The injection refrigerant from 2 can be guided to the compression chamber 13 through the injection port 51 with a predetermined passage resistance, and the injection is achieved as set.

When the injection is not performed, the refrigerant sucked and compressed into the compression chamber 13 also flows into the check valve chamber 57 through the injection port 51, and its dynamic pressure moves through the free valve 54c to the inlet face 57a. So that the fluid passage 92 and the introduction port 85 from the injection pipe 52 that opens to the inlet surface 57a do not communicate with each other,
It is possible to prevent the refrigerant to be compressed from escaping to the injection pipe 52 side beyond the check valve 54, so that the compression is achieved.

Another embodiment shown in FIGS. 5A and 5B is as follows.
Instead of the cutout surface 54c1 of the embodiment, the groove 54
The groove 54c3 communicates with the groove c2, and exhibits the same check valve function as the above-described embodiment.

The injection device according to the second embodiment is also similar to the first embodiment in that the injection device is simple and small with a small number of parts, easy to manufacture, and inexpensive, as in the first embodiment. It has the same effect.

In the experiment of the present inventors, as shown in FIG. 5 (c), when the ratio L / D of the diameter D to the thickness L of the free valve 54c is 0.3 or more, the free valve 54c is free from the free valve 54c. It is easy to improve the responsiveness of the opening / closing operation when the injection of the valve 54c is performed and when the injection is not performed. Specifically, the degree of freedom in setting the cross-sectional area of the fluid passage 92 and the clearance between the free valve 54c and the check valve chamber 57 is increased, and the design and manufacture are facilitated.

In one embodiment, the diameter of the check valve chamber 57 is 6 mm, and the diameter D of the free valve 54c is 5.8 m.
m, thickness L of the free valve is 3 mm, groove 54c2, groove 5
The maximum depth and the cross-sectional radius from the outer diameter line of the free valve 54c of 4c3 were suitable as 2 mm. Further, when the free valve 54c is formed of a material such as polyimide, polyimide containing graphite, and PEEK, the required opening / closing performance and the life corresponding to maintenance-free can be satisfied.

[0044]

According to the present invention, the injection device has a simple and small size with a small number of parts, and is inexpensive to manufacture, while ensuring the necessary check valve function when injection is performed and when injection is not performed. It becomes something.

Further, the dead volume formed by the injection path from the check valve to the compression chamber is also reduced.
Since the amount of refrigerant and lubricating oil that has entered here decreases, diversification of the operation of the refrigeration compressor performs gas injection during high-load operation such as during heating, and performs gas injection during low-load operation such as during cooling. In such a case, even if the refrigerant or the lubricating oil in the dead volume re-expands, the effect can be reduced and the efficiency and performance of the compressor at low load operation can be improved. . Further, since the amount of lubricating oil entering the dead volume is small even if it enters the dead volume, it is possible to reduce a decrease in lubricity of the sliding portion of the compression mechanism and prevent a decrease in performance.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a scroll compressor according to a first embodiment of the present invention.

FIGS. 2A and 2B show an injection device of the compressor shown in FIG. 1, in which FIG. 2A is a sectional view and FIG. 2B shows a valve seat having a reed valve.

FIG. 3 is a longitudinal sectional view of a main part of a scroll compressor according to a second embodiment of the present invention.

4A and 4B show a reed valve employed by a check valve as one embodiment provided in an injection device portion of the compressor shown in FIG. 3, wherein FIG. 4A is a plan view and FIG. FIG.

5A and 5B show a reed valve adopted by a check valve as another embodiment provided in the injection device section of FIG. 3, wherein FIG. 5A is a plan view, FIG. 5B is a perspective view, and FIG. It is sectional drawing of a use state.

[Explanation of symbols]

 2 Compression mechanism 3 Electric motor 11 Fixed scroll 11d End plate 13 Compression chamber 14 Suction port 15 Discharge port 51 Injection port 52 Injection pipe 53 Refrigerant supply pipe 54 Check valve 54a Reed valve 54b Valve seat 54c Free valve 54c1 Notched surface 54c2, 3 groove 57 check valve chamber 57a inlet face 57b outlet face 82 block 85 introduction port 88 valve stopper 92 fluid passage

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiro Tsubagawa 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] A closed space is reduced by the displacement of the compression chamber from the suction position to the discharge position, and the fluid sucked at the suction position is compressed and discharged to the outside at the discharge position. In an injection device of a compressor for performing injection via a check valve, an injection port is provided in a fixed member forming a compression chamber, the injection port penetrating from an outer surface side to a compression chamber substantially in a wall thickness direction, and corresponds to an injection port of the fixed member. A block to which an injection pipe is connected is applied to the outer surface to form a check valve chamber between the block and the fixing member, and an introduction port of the block from the injection pipe to the check valve chamber is opened and closed from the inside. A valve seat having a reed valve is sandwiched between the outer surface of the fixing member and the block, and a reed valve is provided in a part of the check valve chamber. Injection device of a compressor of the valve stopper is characterized in that provided. 2. The closed space is reduced by the displacement of the compression chamber from the suction position to the discharge position, and the fluid sucked at the suction position is compressed and discharged to the outside at the discharge position. In an injection device of a compressor that performs injection through a check valve, an inlet from an injection pipe connected to an outer surface of a fixed member forming a compression chamber, and an injection fluid from the inlet is substantially walled into the compression chamber. A non-return valve chamber is formed between the injection port that guides in the thickness direction, and a free valve that slides between an inlet surface where the introduction port opens and an outlet surface where the injection port opens in the check valve chamber. The check valve chamber is inserted between the sliding contact surface between the outer periphery of the free valve and the inner periphery of the check valve chamber and the opposing surface where the reed valve contacts the outlet surface. A compressor that partially communicates from the surface side to the opening of the injection port on the outlet surface and forms a fluid passage that does not communicate with the opening of the inlet between the opposing surfaces where the free valve and the inlet surface abut. Injection device. 3. The compressor according to claim 2, wherein the check valve chamber and the free valve have a circular cross section, and a ratio L / D of a diameter D to a thickness L of the free valve is 0.3 or more. Injection device.