JP2002168545A - Refrigerating cycle unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerating cycle unit capable of realizing the reduction of costs, a high reliability, a light weight, space-saving and a high serviceability by simplifying the piping structure of a refrigerant circuit and greatly reducing piping materials and brazed parts. SOLUTION: The refrigerating cycle unit comprises a block 30 provided with control instruments, refrigerant passages 9d, 9e, 9f and 9g around the control instruments and connection ports 61, 62 and 63. A valve 15 for opening and closing the passage 9d and a hole 38b having one end communicating with an installation space 38a of the valve 15, and the other end opened to the outside is provided in the block 30. A valve stem 33 connected with the valve 15 is housed in the hole 38b, and plugs 35 and 36 for hermetically sealing the hole 38b are removably attached in the hole 38b. The valve 15 is driven by manipulating the valve stem 33 from outside through the hole 38b from which the plug 36 is removed so as to open and close the passage 9d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle device such as an air conditioner and a refrigerator, and more particularly to a means for simplifying a refrigerant piping structure in a refrigerant circuit.

[0002]

2. Description of the Related Art A conventional technique will be described below using a refrigerator as a representative of a refrigeration cycle apparatus. As shown in FIG. 15, a refrigerant circuit of this type of refrigerator has a compressor 1, an outdoor unit-side heat exchanger 2, an indoor unit-side heat exchanger 3 attached to a showcase or the like, which are main components of the circuit, and A reservoir receiver 4, a pressure reducing mechanism 6, which is a control device of the circuit, a check valve 7,
And a capillary tube 8 and the like connected by a refrigerant pipe 9 to cool a showcase and the like.

In general, a refrigerator has a structure in which an outdoor unit-side unit A and an indoor unit-side (cooler-side) unit B are separated from each other as shown in FIG. The refrigerant pipe 9b of the indoor unit-side unit B is connected via a connector such as a suction operation valve 10a and a liquid operation valve 10b. In the drawing, solid arrows indicate the flow of the refrigerant.

In the outdoor unit A of the refrigerator described above, as shown in FIG. 15, a compressor 1, an outdoor unit heat exchanger 2, a check valve 7, and a capillary which are main components of a refrigerant circuit are provided. A large number of refrigerant pipes 9 connecting the tubes 8 and the like are bent and disposed in various directions. These main devices and the refrigerant pipe 9 are connected to each other by brazing or the like.

[0005] In particular, the refrigerator is operated at a temperature near or below the freezing point, because the refrigerator is cooled by heat transfer from the refrigerant on the low pressure side and is frozen. Therefore, the low pressure side operating pressure is reduced, and the operation becomes a high compression ratio operation. Therefore, depending on the operating conditions, the refrigerant temperature on the high pressure side may increase due to the refrigerant characteristics and become higher than the allowable discharge temperature of the compressor 1. Therefore, in order to prevent the discharge temperature from rising, a part of the liquid refrigerant is taken out from the refrigerant pipe (liquid line on the high pressure side) 9c from the outdoor unit heat exchanger 2 to the pressure reducing mechanism 6 and the liquid sump receiver 4 and compressed. The compressor 1 has an injection circuit 12 for bypassing to a low-temperature low-pressure gas circuit on the suction side or the like or to an intermediate pressure section in the compressor 1. The injection circuit 12 includes a solenoid valve 1 for adjusting an injection amount.
4, a capillary 8, a ball valve 15a and the like.

[0006] In such a refrigerator, the oil in the compressor 1 is changed during service or maintenance. In that case, by pumping down the refrigerator, most of the refrigerant in the refrigerant circuit is stored in the reservoir 4 or the like, and the suction operation valve 10a, the discharge operation valve 10c, and the ball valve 15a of the injection circuit 12 are closed. The service and maintenance work can be performed only by shutting off the refrigerant circuit in the vicinity of the compressor 1 and discharging only the small refrigerant in the circuit in the vicinity of the compressor 1. Therefore, there is almost no change in the amount of refrigerant in the refrigerant circuit before and after the operation, and a long-term evacuation of the entire refrigerant circuit and a large amount of additional refrigerant charge are prevented. The same applies when replacing the compressor.

[0007]

As described above, in the conventional refrigerator, the main equipment, the control equipment, and the main equipment and the control equipment are all connected by refrigerant pipes, so that they are necessary for assembly. There are many types and usage of refrigerant piping parts,
This was causing an increase in cost. Further, since the number of brazing points is very large and the shape of the refrigerant pipe is complicated, the brazing operation is troublesome, and the assembling operation is complicated and difficult. Furthermore, since the components are connected to each other by a refrigerant pipe having a complicated arrangement, the space required for the connection of the pipes is increased, and there is a problem in that the entire outdoor unit is increased in size.

Further, from the viewpoint of service and the like, a mechanism for shutting off a circuit near the compressor from the refrigerant circuit by a valve or the like is required. In particular, when an injection function is required for a refrigerator or the like, it is necessary to add a ball valve or the like for shutting off the circuit in the injection circuit, which leads to an increase in cost and a more complicated piping structure, resulting in deterioration of assemblability and an increase in size. Was invited.

In order to improve the complexity of the piping shape and assembly,
FIG. 16 shows a conventional example disclosed in Japanese Patent Publication No. 7-37866 as a method of saving space. In this case, a structure using a piping unit in which a refrigerant passage for flowing a high-temperature refrigerant in a discharge line and a refrigerant passage for flowing a low-temperature refrigerant in a suction line is formed is shown. In FIG. 16, a piping unit 11 has connection ports 19a, 19b, 19c, 19d, and 2 for connecting the four-way valve 13 and the two-way valve 18 as control devices of the refrigerant circuit to other devices.
0, 21, 22a, 22b, 23a, and 23b are formed as a block body. This piping unit 1
1 to form a refrigerant circuit, the piping unit 1
1 discharge connection port 19a, suction connection port 19b
Then, a discharge pipe and a suction pipe (both not shown) of the compressor are connected respectively. The outdoor unit-side heat exchanger (not shown) is connected to the outdoor connection ports 19 c and 2 of the piping unit 11.
0 through a connection pipe (not shown). Further, an indoor unit side unit (not shown) having an indoor unit side heat exchanger and the like is connected to the connection port 19 of the piping unit 11.
d, 21 via connection pipes (not shown). Further, the connection port 22 of the piping unit 11
A pressure reducing mechanism (both not shown) such as a capillary tube and an expansion valve is connected to a, 22b, 23a and 23b. As described above, a complicated pipe shape is formed in one block body, and each section pipe is connected thereto, thereby improving the complexity of the pipe shape and assembly and saving space.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to simplify a piping structure in a refrigerant circuit and greatly reduce piping materials and brazing points. Cost reduction, high reliability,
It is an object of the present invention to provide a refrigeration cycle device that can realize light weight, small space, and high serviceability.

[0011]

In order to achieve the above-mentioned object, a refrigeration cycle apparatus according to the present invention has a control circuit for a refrigerant circuit such as an electromagnetic valve incorporated in a block-like block, and a control block around the control apparatus. A refrigerant passage is formed in the block body, and a refrigerant passage, a compressor, an indoor unit side heat exchanger,
Alternatively, in a refrigeration cycle apparatus in which a connection port for connecting to a main device of a refrigerant circuit such as an outdoor unit-side heat exchanger is provided in a block body, a valve section that opens and closes a refrigerant passage, and one end is provided with a valve section inside the block body. A hole communicating with the space and having the other end open to the outside is provided, a valve rod connected to the valve is housed in the hole, and a plug for sealing the hole is detachably provided in the hole,
The refrigerant passage is opened and closed by operating the valve rod from outside through the hole from which the plug is removed.

Further, in the above construction, a circumferential groove is provided on the inner peripheral surface of the hole of the block body, a stopper for regulating the position of the valve rod is inserted and supported in the circumferential groove, and the position of the circumferential groove in the hole is provided. Is set at a position where a minute gap is provided between the lower end surface position of the stopper inserted into the orbital groove and the upper end surface position of the valve rod housed in the hole.

[0013] In the configuration of claim 2, the stopper is formed of a wire.

Further, in the configuration of claim 2, the stopper is formed of a plate material.

In each of the second to fourth aspects, the stopper is formed in a bent shape, and the outer diameter of the stopper in the bending direction is set smaller than the inner diameter of the hole of the block body.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 of the Invention FIG. 1 is a schematic configuration diagram showing a refrigerator as a refrigeration cycle device according to Embodiment 1 of the present invention. In FIG. 1, as the main components of the refrigerant circuit, 1 is a compressor, 2 is an outdoor unit side heat exchanger, 3 is an indoor unit side heat exchanger attached to a showcase or the like, and 4 is a reservoir receiver. Further, as control devices for the refrigerant circuit, 6 is a pressure reducing mechanism, and 7 is a check valve. These are connected by a refrigerant pipe 9 to form a refrigerant circuit and cool a showcase or the like. Further, the refrigerator is separated into an outdoor unit side unit A and an indoor unit side (cooler side) unit B, and a refrigerant pipe 9a of the outdoor unit side unit A and a refrigerant pipe 9b of the indoor unit side unit B perform a suction operation. Valve 10a,
It is connected via a connector such as the liquid operation valve 10b. In the drawing, solid arrows indicate the flow of the refrigerant. Reference numeral 20 denotes an injection circuit configured in the refrigerant circuit, which introduces a part of the liquid refrigerant from the liquid line 9c or the liquid reservoir receiver 4 into the suction pipe of the compressor 1 or into the compressor 1. . In the injection circuit 20, a part of the liquid refrigerant is introduced into the suction pipe of the compressor 1 or the inside of the compressor 1 through the capillaries 8a and 8b set so that an arbitrary flow rate flows after passing through the valve portion 15. Reference numerals 14a and 14b denote solenoid valves for switching the required injection flow rate by opening and closing the refrigerant passages 9f and 9g to the respective capillaries 8a and 8b.

FIG. 2 is a schematic configuration diagram showing a part of the injection circuit 20 shown in FIG. In FIG. 2, 3
Reference numeral 0 denotes a block-like block forming a part of the injection circuit 20, reference numeral 31 denotes a ball for shielding or opening the refrigerant passage 9d, and a flow passage hole 31b is provided at the center. Reference numeral 32 denotes a valve seat for slidably sealing the block body 30 and the ball 31. The ball portion 15 and the valve seats 32 constitute the valve portion 15. 3
Reference numeral 3 denotes a valve rod which is inserted and supported in the block body 30, and is connected so as to be in the same phase as the ball 31 by inserting a flat portion at the tip into a notch groove 31 a provided in the ball 31. ing. In other words, when the valve rod 33 is turned, the ball 31 rotates in the same phase in the same manner.
The passage hole 31b of the ball 31 communicates or closes with the passage hole 32a of the valve seat 32 depending on the rotation position of the ball 31 (that is, the rotation position of the valve rod 33), and the refrigerant passage 9d is opened and closed. 34 is an O inserted in the valve rod 33.
The ring 35 is a stopper having a through hole 35a in the center,
It is fixed to the block body 30 with a minute gap between it and the upper end surface of the valve rod 33, and prevents refrigerant leakage by shutting off the air space and the refrigerant passage 9d in the block body 30 with a metal seal or the like. It is configured as follows. Reference numeral 36 denotes a service stopper for sealing the through hole 35a of the stopper 35 together with the packing 36a. Reference numeral 37 denotes a lid for sealing the ball 31 and the valve seats 32, 32 with an arbitrary pressing force after inserting the ball 31 and the valve seats 32, 32 into the block body 30. 38a is the block 3
0 and a valve portion 1 pierced from the side surface to communicate with the refrigerant passage 9d.
5, a ball 31, a valve seat 32,
32, the distal end of the valve rod 33 is accommodated and sealed by a lid 37. Reference numeral 38b denotes a hole portion having one end communicating with the installation space 38a of the valve portion 15 and the other end opening to the outside on the upper surface of the block body 30.
5. The packing 36a and the service plug 36 are adapted to be openably and closably sealed. As described above, the valve section 15 and the solenoid valves 14a and 14b, each of which forms part of the injection circuit 20, are provided in one block body 30.

Next, each connection port 6 of the block 30
The correlation to 1, 62, and 63 and the flow of the refrigerant during normal operation will be described. The refrigerant pipe branched from the sump receiver 4 or the liquid line 9 c is connected to the connection port 61 of the lid 37 incorporated in the block 30, so that the refrigerant from the sump receiver 4 is supplied to the valve seat 3.
The electromagnetic valve 14a enters the solenoid valve 14a through the second flow path hole 32a and the flow path hole 31b of the ball 31. When injection is not required due to the operating conditions of the unit (for example, when the discharge temperature of the compressor 1 is low), the solenoid valve 14a is not opened and the refrigerant passage 9d is shut off, so that the refrigerant flows downstream of the solenoid valve 14a. Does not flow and is therefore not injected. If injection is required due to operating conditions, the solenoid valve 14
By opening a and closing the solenoid valve 14b, the refrigerant flows to the capillary 8a through the refrigerant passage 9f. If a larger injection flow rate is required, a solenoid valve 1
Since the refrigerant flows into the refrigerant passage 9g by opening both 4a and 14b, the injection flow rate can be adjusted as needed. The refrigerant that has passed through the capillaries 8a and 8b merges and then flows into the suction pipe of the compressor 1 or into the compressor 1.

Next, the function when the valve portion 15 is opened and closed (during service) and the ease of assembly will be described. By inserting the valve seat 32, the ball 31, and the valve seat 32 from the side opening into the installation space 38a of the block body 30 and tightening the lid 37 having an arbitrary dimension, the valve seat 32,
The ball 31 is pressed against the inner surface of the block 30 with a set load. Thereby, the block body 30 to the valve seat 32,
When the sealing property between the valve seat 32 to the ball 31 and the valve seat 32 to the lid 37 is ensured, and when the passage hole 31b provided in the ball 31 is not opened in the passage hole 32a of the valve seat 32, the refrigerant passage 9d The installation space 38a is made airtight. The installation space 38 a and the outside are hermetically sealed by a metal seal of the lid 37 and the block body 30. The installation space 38a and the hole 38b are separated from each other by an O-ring 34 attached to the outer periphery of the valve rod 33 to be airtight.
Further, the hole 38b is made airtight with the outside air by the metal seal of the block body 30 and the plug 35, the plug 35, the packing 36a, and the service plug 36.

During service of the compressor 1 or the like, usually, most of the refrigerant is stored in the reservoir 4 or the like by pump-down operation, and then the suction operation valve 10a, the discharge operation valve 10c, and the valve section of the block body 30 are operated. By closing 15, the circuit near the compressor 1 is cut off from the remaining refrigerant circuit. In this case, first, the service tap 36 is removed from the tap 35, and the valve rod 33 is operated through the through hole 35a of the tap 35. An operation groove 33a is provided at the upper end of the valve rod 33, and a ball screwdriver or the like is inserted into the operation groove 33a from outside through a through hole 35a and a hole 38b to operate and rotate the ball 31, so that the flow of the ball 31 flows. The road hole 31b can be closed. The conventional ball valve 1 is previously installed in the valve rod 33.
Similarly to 5a (see FIG. 15), a stopper (not shown) for regulating the rotation of 90 ° is provided. Therefore, for example, the valve is set to be open when rotated to the stopper position to the right, and to be closed when rotated to the stopper position to the left. Assuming that the refrigerant passage 9 is provided in the installation space 38a.
If the refrigerant has leaked from d and the pressure has risen, the hole 38b drops to atmospheric pressure to remove the service plug 36 during service. Therefore, the pressure is “hole 38b <installation space 3
8a ", and a differential pressure is applied to the valve rod 33 to push it outward. Even in this case, the valve rod 33 is
Since the position is regulated by contacting the bottom surface of the plug 35 fixed and supported on the inner surface of the hole b, it does not jump out of the hole 38b to the outside.

FIG. 3 shows a case in which a stopper 43 for preventing the valve rod from popping out is formed integrally with the block body 30 instead of the plug 35 having the function of preventing the valve rod from popping out. Reference numeral 38c denotes a hole formed by communicating from the upper surface of the block body 30 to the installation space 38a. The hole 38c accommodates the valve rod 39 and is sealed by the service plug 40. However, there is a problem in this configuration.
For example, the valve rod 39 must be inserted from the installation space 38a side at the time of assembling, so that the workability is poor. Since it is necessary to perform taper processing (substantially impossible), and since a stopper 43 for preventing the valve rod from projecting is provided in the middle of the hole 38c, the processing of the valve rod insertion hole 44 is performed by centering. There are issues such as inevitable. However, these problems are improved in the first embodiment shown in FIG. 2, and the productivity (workability, assemblability) and reliability are also improved.

Therefore, according to this refrigeration cycle apparatus,
In the block body 30 itself, refrigerant passages 9d, 9e, 9f, 9g around control devices of the refrigerant circuit and connection ports 61, 62, 63 for connection with main devices of the refrigerant circuit are formed, and the valve portion 15 is built in. Therefore, the number of brazing points is greatly reduced, and the refrigerant piping structure is simplified. Therefore, the size of the outdoor unit A can be reduced. In addition, the valve section 15
Can be opened and closed externally, greatly improving serviceability. In the above embodiment, the block 3
0, solenoid valves 14a, 14 which are control devices of the refrigerant circuit.
b, the valve section 15 and the like are built in, and the refrigerant passages 9d, 9e, 9f, 9g around these control devices and the connection ports 61, 62, 63 for the main devices of the refrigerant circuit are shown. Other than these, the refrigerant passage around the above mechanism may be incorporated in the block body 30.

Embodiment 2 of the Invention In FIG.
Is a circumferential groove provided on the inner peripheral surface of the hole 38b of the block body 30, 51 is a stopper substituted by a C-shaped retaining ring inserted and supported in the circumferential groove 50, and 52 is fixed to the block body 30 by screws or the like. This is a service plug that is metal-sealed and shuts off the outside air and the hole 38b. As described above, the valve unit 15, the solenoid valve 14a, and the
14 b is provided in one block body 30. The position of the orbital groove 50 in the hole 38b is determined by the lower end surface 51 of the stopper 51 inserted into the orbital groove 50.
It is set at a position where a minute gap d is provided between the position d and the position of the upper end surface 33u of the valve rod 33 housed in the hole 38b. The installation space 38a and the hole 38b are air-tightly separated by the O-ring 34. The hole 38b is made airtight with the outside air by a metal seal between the block body 30 and the service plug 52.

Therefore, when the compressor 1 is serviced, the service plug 52 is removed from the block 30 and the valve rod 3
3 is operated from outside. Since the operation groove 33a is provided on the upper end face 33u of the valve rod 33, the ball passage hole 31b can be closed by inserting a minus screwdriver or the like into the operation groove 33a and rotating the valve rod 33. The valve rod 33 has 9 holes in advance in the same manner as a conventional ball valve.
A 0 ° rotation restricting stopper (not shown) is provided. For example, it is set so that the valve is opened when rotated to the stopper position to the right and closed when rotated to the stopper position to the left. I have. Temporarily, the installation space 38a
If the pressure rises due to leakage of the refrigerant from the refrigerant passage 9d, the service plug 52 is removed at the time of service, so that the hole 38b drops to atmospheric pressure. Therefore, the pressure becomes “hole 38b <installation space 38a”, and a differential pressure is generated to push valve rod 33 out. Even in this case, the valve rod 33 contacts the stopper 51 inserted into the orbital groove 50 of the hole 38b and is regulated in position, so that the valve rod 33 does not protrude from the hole 38b. Further, by using a standard C-type retaining ring as the stopper 51, cost can be reduced.

Embodiment 3 of the Invention In FIG. 5, 50
Is a peripheral groove provided on the inner peripheral surface of the hole 38b of the block body 30, and 54 is a stopper inserted into the peripheral groove 50 with a small gap between itself and the upper end surface of the valve rod 33. And the like are bent into a four-leaf shape. The stopper 54 is also formed with an open center so that the valve rod 33 can be opened and closed by a flathead screwdriver or the like. A service plug 52 is fixed to the hole 38b of the block body 30 with a screw or the like and hermetically shuts off the outside air and the hole 38b with a metal seal or the like. FIG. 6 is a plan view of a stopper formed of a spring material (wire), and FIG. 7 is an explanatory diagram showing a load distribution applied to the stopper 54 when a differential pressure is applied.

The stopper 54 has an outer diameter which is equal to the outer diameter of the orbital groove 50 of the hole 38b in the free state. Therefore, when inserting the stopper 54 into the orbital groove 50, as shown in FIG.
4a is elastically deformed by being sandwiched between jigs such as tapered pliers,
It is inserted into the circumferential groove 50 with the outer diameter reduced. After that, when it is set free, the stopper 54 expands and fits in the circumferential groove 50. If there is a refrigerant leak from the refrigerant passage 9d in the installation space 38a and a differential pressure is applied to the valve rod 33 so as to push it out, as shown in FIG. , A shear force acts on the stopper 54.

Therefore, if the wire diameter of the stopper 54, the material, and the number of curved portions that enter the orbital groove 50 are properly selected so as to have a sufficient shear strength against the applied pressure, the stopper 54 can be broken. It is possible to reliably prevent the valve rod 33 from jumping out. In addition, simple assembling provides good assembling properties, and a structure that saves cost, space, and high serviceability can be obtained. In addition, since the central portion of the stopper 54 is open, it goes without saying that there is no problem in opening and closing the valve rod 33.

Embodiment 4 of the Invention Embodiment 4 of the present invention will be described with reference to FIGS. In FIG. 8, 5
Reference numeral 5 denotes a stopper inserted into the orbital groove 50 at a position having a minute gap with the upper end surface of the valve rod 33, and is formed of a plate material such as a spring plate. A stopper 5 is provided so that the valve rod 33 can be opened and closed by a flathead screwdriver or the like.
5 is provided with a through hole 55a in the center. Also,
FIG. 9 is a structural diagram of a stopper formed of a plate material.

In the free state, the stopper 55 is set to have the same outer diameter as the outer diameter of the orbital groove 50 of the hole 38b. Therefore, when the stopper 55 is inserted into the orbital groove 50, both ends on the long side of the stopper 55 are sandwiched by jigs such as tapered pliers and elastically deformed into a bow shape or the like to reduce the outer diameter. The outer diameter is reduced and inserted into the circumferential groove 50 in this manner.
Thereafter, when the stopper 55 is set free, the stopper 55 expands and fits in the circumferential groove 50. If there is a refrigerant leak from the refrigerant passage 9d in the installation space 38a and a differential pressure is applied to the valve rod 33 to push it out, pressure acts on the entire bottom surface of the valve rod 33 as in FIG. Therefore, a shearing force acts on the stopper 55. Therefore, if the thickness of the stopper 55, the material, and the circumferential length of the stopper groove 50 are appropriately selected so that the stopper 55 has sufficient shear strength against the applied pressure, the stopper 55 can be surely prevented from being broken. The valve rod 33 can be prevented from jumping out. By providing such a stopper 55, a structure that is simple, has good assemblability, and saves cost, space, and high service can be obtained.
Further, since the stopper 55 has a through hole 55a at the center thereof, it goes without saying that there is no problem in opening and closing the valve rod 33.

Embodiment 5 of the Invention Embodiment 5 of the present invention will be described with reference to FIGS. In FIG. 10, 5
Reference numeral 6 denotes a stopper which is inserted into the orbital groove 50 at a position having a minute gap with the upper end surface of the valve rod 33, and is formed of a plate material. Further, a through hole 56a is provided at the center of the stopper 56 so that the valve rod 33 can be opened and closed by a minus driver or the like. FIG.
As shown in FIGS. 13 to 13, the stopper 56 is formed in a bent shape in the shape of a letter when viewed from the side, and the outer diameter ΦD1 in the bending direction is slightly smaller than the inner diameter ΦD of the hole 38b (ΦD ≧ ΦD1). Is set to That is, the stopper 56 is formed so as to pass through the hole 38b. Further, in order to easily insert the stopper 56 into the orbiting groove 50, the lower surface position of the orbiting groove 50 is set to be equal to or lower than the height of the upper end surface of the valve rod 33.

At the time of assembly, the bent stopper 56 is inserted into the hole 38b and placed on the upper end face of the valve rod 33. In this state, the stopper 56 is pressurized from the outside and plastically deformed, whereby the stopper 56 is developed, and both ends are inserted into the orbital groove 50 and supported. Assume that the installation space 38
When a differential pressure is applied to the valve rod 33 to push it out due to the leakage of the refrigerant from the refrigerant passage 9d into the valve rod 33a, pressure acts on the entire bottom surface of the valve rod 33 as in FIG. Shear force acts on Therefore, if the thickness of the stopper 56, the material thereof, and the length in the circumferential direction of the stopper groove 50 are properly selected so as to have sufficient shear strength against the applied pressure, the stopper 56 can be surely prevented from being broken. The valve rod 33 can be prevented from jumping out.
Moreover, at the time of assembly, the stopper 56 placed on the valve rod 33 need only be lightly hit with a plastic hammer or the like to be deployed, so that a simple, good workability, cost-saving and space-saving structure can be obtained. Stopper 5
6 has a through hole 55a at the center thereof, so that there is no problem in opening and closing the valve rod 33.

Further, as shown in FIG. 14, a stopper 56 shown in FIG. 14 is formed by bending both ends 56b in the longitudinal direction in a direction opposite to the bending direction of the center of the stopper 56, that is, forming a reverse tapered shape in a side view. can do. According to the stopper 56, the stopper 56 is
Since the taper is reversely tapered as it is deployed, the ease of insertion into the circumferential groove 50 is improved. Therefore, it goes without saying that it leads to improvement in reliability due to improvement in assemblability and reduction in variation.

[0034]

As described above in detail, the refrigeration cycle apparatus according to the present invention accommodates the valve rod connected to the valve portion in the hole communicating with the installation space of the valve portion in the block body. Since the plug for sealing the portion is detachably provided in the hole, the piping structure in the refrigerant circuit can be simplified, and the piping material and brazing portions can be greatly reduced. In addition, since operability during service can be improved, it is possible to provide a refrigeration cycle apparatus that has effects such as low cost, high reliability, light weight, small space, high serviceability, and high work efficiency. In addition, the valve can be operated by operating the valve rod from the outside through the hole from which the plug has been removed, thereby opening and closing the refrigerant passage in the block body, thereby further improving serviceability.

Since the stopper is formed in a bent shape and the outer diameter of the stopper in the bending direction is set smaller than the inner diameter of the hole of the block body, the stopper in the bent state is moved to the position of the orbital groove in the hole. It can be easily inserted. Subsequently, by pressing or hitting the bent portion of the stopper to expand the stopper, the stopper can be easily inserted and supported in the circumferential groove.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram showing a refrigerator according to Embodiment 1 of the present invention.

FIG. 2 is a schematic configuration diagram showing structural components of the refrigerator according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing structural components of the refrigerator according to Embodiment 1 of the present invention.

FIG. 4 is a schematic configuration diagram showing structural components of a refrigerator according to a second embodiment of the present invention.

5A and 5B show structural components of a refrigerator according to a third embodiment of the present invention, wherein FIG. 5A is a schematic configuration diagram, and FIG.
FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 6 is a schematic component diagram showing structural components of a refrigerator according to Embodiment 3 of the present invention.

FIG. 7 is a view for explaining structural parts of a refrigerator according to a third embodiment of the present invention, in which (a) is an explanatory view showing a cross section near a circumferential groove, a valve rod, and a stopper, and (b) is a stopper. It is explanatory drawing which shows the load etc. which apply to.

8A and 8B show structural components of a refrigerator according to a fourth embodiment of the present invention, wherein FIG. 8A is a schematic configuration diagram, and FIG.
FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 9 shows a stopper of a refrigerator according to a fourth embodiment of the present invention, where (a) is a side view and (b) is a plan view.

FIG. 10 shows a stopper of a refrigerator according to a fifth embodiment of the present invention, wherein (a) is a side view and (b)
Is a plan view, and (c) is a sectional view.

FIG. 11 is a schematic configuration diagram showing structural components of a refrigerator according to Embodiment 5 of the present invention.

FIG. 12 is a schematic configuration diagram showing structural components of a refrigerator according to a fifth embodiment of the present invention.

FIG. 13 is a schematic configuration diagram showing structural components of a refrigerator according to Embodiment 5 of the present invention.

FIG. 14 is a sectional view showing a stopper of a refrigerator according to a fifth embodiment of the present invention.

FIG. 15 is a refrigerant circuit diagram showing a conventional refrigerator.

FIG. 16 is a perspective view showing a piping unit used in a conventional refrigerator.

[Explanation of symbols]

1 compressor, 2 outdoor unit side heat exchanger, 3 indoor unit side heat exchanger, 9d refrigerant passage, 9e refrigerant passage, 9f refrigerant passage, 9g refrigerant passage, 14a solenoid valve, 14b solenoid valve,
15 Valve part, 30 block body, 31 ball, 33
Valve rod, 33u Upper end position, 35 stopper (plug), 3
6 Service taps (plugs), 38a Installation space, 38b
Hole, 38c Hole, 39 valve rod, 40 service tap (plug), 50 orbital groove, 51 stopper, 51d
Lower end face position, 52 service plug (plug), 54 stopper, 55 stopper, 56 stopper, 61 connection port, 62 connection port, 63 connection port, d
Small gap, ΦD inner diameter, ΦD1 outer diameter.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kawa ▲ Saki ▼ Masao 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Yuji Sata 2-2-2 Marunouchi, Chiyoda-ku, Tokyo No. 3 Inside Mitsubishi Electric Co., Ltd. (72) Munehisa Korishima 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Takahiro Yamaya 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Mitsubishi Electric Corporation (reference) 3H054 AA03 BB16 BB17 BB30 EE04 GG04 GG14

Claims (5)

[Claims] 1. A control device for a refrigerant circuit such as an electromagnetic valve is built in a block-shaped block, a refrigerant passage around the control device is formed in the block, and the refrigerant passage, a compressor and an indoor unit are further formed. In the refrigeration cycle apparatus provided with a connection port for connecting a main heat exchanger or a main device of a refrigerant circuit such as an outdoor unit heat exchanger to the block body,
A valve portion for opening and closing the refrigerant passage in the block body;
One end is provided with a hole that communicates with the installation space of the valve part and the other end is opened to the outside, a valve rod connected to the valve part is accommodated in the hole, and a plug that seals the hole is provided. A refrigeration cycle apparatus wherein the refrigerant passage is opened and closed by being detachably provided in the hole and operating the valve rod from outside through the hole with the plug removed. 2. A circumferential groove is provided on an inner peripheral surface of a hole of a block body, a stopper for regulating the position of a valve rod is inserted and supported in the circumferential groove, and an arrangement position of the circumferential groove in the hole is determined. 2. The valve according to claim 1, wherein a small gap is provided between a lower end surface of the stopper inserted into the orbital groove and an upper end surface of the valve rod housed in the hole. A refrigeration cycle apparatus according to the paragraph. 3. The refrigeration cycle apparatus according to claim 2, wherein the stopper is formed of a wire. 4. The refrigeration cycle apparatus according to claim 2, wherein the stopper is formed of a plate. 5. The plastically deformable stopper is formed in a bent shape, and the outer diameter of the stopper in the bending direction is set smaller than the inner diameter of the hole of the block body. Item 5. A refrigeration cycle apparatus according to any one of items 4.