JPH10300280A - Inflation valve with pipe connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs and to improve a working efficiency even in a limited space without requiring any exclusive tool when making connection to a pipe. SOLUTION: An inflation valve with a pipe connection device has a block 1 where a first refrigerant channel 5 and a second refrigerant channel 6 are formed and a connection device that is provided at the first block 1 and connects a connection pipe 3 to the channels 5 and 6 of the block 1 while two connection pipes 3 are fixed. In this case, the connecting device is constituted of a pipe connection member 2 in a rectangular parallelepiped shape with two through holes 18 in forward and backward directions and two cylindrical engagement members 21 that are engaged into each through hole 18 in forward projecting shape, two backward projecting cylindrical parts 17 that are connected to each through hole 18 are provided, the front edge part of each cylindrical engagement member 21 is engaged into the rear part of the refrigerant channels 5 and 6 of the block 1 and the connection member 2 is sealed to the block 1, and each connection pipe 3 is inserted into the engagement member 21 from the rear edge opening of each cylindrical part 17 and is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion valve for controlling the flow rate of refrigerant flowing into an evaporator main body according to the temperature of the refrigerant flowing out of the evaporator main body.

[0002]

2. Description of the Related Art Conventionally, in an expansion valve of an air conditioner such as an automobile, the expansion valve and a pipe are connected by a union and a nut.

[0003]

There is a problem that a special tool is required to connect the expansion valve and the pipe using the union and the nut. Further, when there is a restriction on a work space such as an engine room in an automobile, there is a problem that workability is poor and work time is required.

[0004] In order to solve this problem, for example, it is conceivable to provide a pipe connecting device described in Japanese Patent Application No. 8-116035 integrally with a block of an expansion valve. It is necessary to perform cutting, and in the process of manufacturing the block of the expansion valve, it is necessary to provide a cutting margin for cutting out the connection device,
There is a problem that the expansion valve becomes expensive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an inexpensive pipe connection which does not require a special tool when connecting to a pipe and has good workability even in a limited space and does not require a long working time. It is to provide an expansion valve with a device.

[0006]

According to the expansion valve with the pipe connection device of the present invention, the first refrigerant flow path through which the refrigerant flowing into the evaporator flows and the second refrigerant flow path through which the refrigerant flowing out of the evaporator flows. An expansion valve with a pipe connection device, comprising: a formed block; and a connection device provided in the block and fixed to two connection pipes, the connection device communicating each connection pipe with each flow path of the block. Has a rectangular parallelepiped pipe connection member having two front-rear direction through holes, and two cylindrical fitting members fitted into each through hole in a forwardly projecting shape. Are provided, and the connecting member is fixed to the block in a state where the front end of each cylindrical fitting member is fitted into the rear end of each refrigerant flow path of the block. Connection pipe is at the rear end of each tubular part It is what is adapted to be fixedly inserted into the insert member from the mouth.

Further, the connecting device is composed of two cylindrical connecting members fixed to the block by the fixing means and communicated with the respective refrigerant passages, and each connecting pipe is connected to a rear end opening of each connecting member. In some cases, they are inserted and fixed in the connection members.

[0008] A pipe connection provided in a block and a block in which a refrigerant flow path through which the refrigerant flowing into the evaporator flows is formed, and a connection device fixed to the connection pipe and communicating the connection pipe with the refrigerant flow path of the block. In the case of the expansion valve with the device, the refrigerant flow passage communicates the low-pressure refrigerant outflow path in the front-rear direction, the high-pressure refrigerant inflow path in the vertical direction located below the low-pressure refrigerant outflow path, and the inflow path and the outflow path. The connecting device is formed integrally with the block around the lower portion of the high-pressure refrigerant inflow passage, and a female screw is formed above the connection device of the high-pressure refrigerant inflow passage to form a female screw. A valve body that changes the opening of the communication passage and an adjustment spring that urges the valve body are arranged above the female screw.The adjustment screw that holds the adjustment spring is screwed to the female screw, and the coolant passes through the adjustment screw. A hole may be formed.

[0009]

1 and 2 show an expansion valve with a pipe connection device according to the present invention. In the following description, the front and rear refer to FIG. 2 as a reference, the front refers to the left of FIG. 2, and the rear refers to the right.

The expansion valve adjusts the flow rate of the refrigerant flowing into the evaporator main body according to the temperature of the refrigerant flowing out of the evaporator main body, connects the connection pipe to the refrigerant flow path, and has a rectangular parallelepiped block ( 1) and two connecting pipes fixed to the block (1), and
(3) and a rectangular parallelepiped pipe connecting member (2).

The block (1) has a first refrigerant flow path (5) through which the refrigerant flowing into the evaporator flows, and a second refrigerant flow path (6) through which the refrigerant flowing out of the evaporator flows. Note that the first refrigerant flow path (5) and the second refrigerant flow path (6) are formed to be vertically displaced from each other, and in the present embodiment, the second refrigerant flow path (6) is located at an upper position. I have. Further, the block (1) has a thermosensitive cylinder insertion hole (7) extending downward from the upper surface and communicating with the second refrigerant flow path (6), and a bottomed screw hole (forward) extending forward from the rear surface. 8) is provided.

The first refrigerant flow path (5) has a low-pressure refrigerant outflow path (5a).
The high-pressure refrigerant inflow path (5b) located below the low-pressure refrigerant outflow path (5a), the low-pressure refrigerant outflow path (5a) and the high-pressure refrigerant inflow path (5b) communicate with each other, and the temperature-sensitive cylinder insertion hole ( 7) and a vertical communication path (5c) located on the coaxial line. High-pressure refrigerant inflow path (5
The front part of b) extends downward and has a circular cross section, and a female screw (5d) is formed in this part. First
Both flow paths (5) and (6) between the refrigerant flow path (5) and the second refrigerant flow path (6)
And a valve stem insertion hole (9) located coaxially with the thermosensitive cylinder insertion hole (7). Temperature sensing tube insertion hole (7)
The upper part has a large diameter part. The upper part of the valve stem insertion hole (9) has a large diameter portion.

Then, the thermosensitive cylinder (10) is inserted through the thermosensitive cylinder insertion hole (7).
The valve stem (12) attached to the tip of the temperature-sensitive cylinder (10) is inserted, and the valve stem (12) is inserted into the valve stem insertion hole (9).
a) and the communication path (5c), the tip of which is located in the high-pressure refrigerant inflow path (5b), and the diaphragm (13) provided at the rear end of the temperature-sensitive cylinder (10) is a block (1). Located outside. A ball valve (14) is attached to the tip of the valve stem (12), and the ball valve (14)
The valve opening is adjusted by an adjusting spring (15) and an adjusting screw (16) positioned below the valve.

The rectangular pipe connecting member (2) is made of an elastic synthetic resin and has two rearwardly projecting cylindrical portions (17) having different diameters provided on the rear surface. Department (17)
A through hole (18) having a different diameter in the front and rear direction is formed, and a bolt insertion hole in the front and rear direction is provided between the two through holes (18).
(19) is formed. The bolt insertion hole (19) has a large diameter at the rear part, and this rear part is a bolt head insertion part.

Two holes (17a) extending in the circumferential direction are formed in the peripheral wall of each cylindrical portion (17). In addition, the cylindrical part (1
The inner diameter of 7) is larger than the inner diameter of the through hole (18), and a step portion (20) is formed at the front end of the cylindrical portion (17), and the cylindrical portion (17) receives the pipe. It has been done.

Each of the through holes (1) of the rectangular parallelepiped pipe connecting member (2)
8) has the same cylindrical fitting member (2
1) is fitted so that its front end protrudes.
Each of the cylindrical fitting members (21) is made of aluminum, and has a large-diameter portion (21a) having the same outer diameter as the inner diameter of the fitted through-hole (18), and a front portion of the large-diameter portion (21a). And a small diameter portion (21b) provided through a step portion. This large diameter part (21
On the outer periphery of a), an annular projection (21c) having a triangular cross section is formed at the center in the front-rear direction, and this annular projection (21c) is formed.
Are fitted in annular grooves (18a) formed in the peripheral wall of each fitting through hole (18), and each cylindrical fitting member (21) is fixed to the rectangular parallelepiped pipe connection member (2).

Since the rectangular parallelepiped pipe connecting member (2) is made of an elastic synthetic resin, the fitting of each tubular fitting member (21) into each fitting through hole (18) is performed by fitting each fitting. Through hole
(18) expands, and in this state, the tubular fitting member (21) is fitted into each fitting through hole (18), and the annular projection (21c) is fitted into the annular groove.
(18a). Thereafter, the rectangular pipe connection member (2) returns to its original state.

The rectangular parallelepiped pipe connecting member (2) is provided with bolts when the front end of each tubular fitting member (21) is fitted into the rear end of each refrigerant flow path (5) (6) of the expansion valve. The block (1) is fixed to the block (1) by bolts (24) passed through the insertion hole (19) and screwed into the screw holes (8) of the block (1).

Connection pipe (3) connected to this expansion valve
Has an annular projection (3a) formed on the peripheral wall. Connecting pipe
An annular groove is formed in a portion of (3) in front of the annular protrusion (3a), and an O-ring (26) is fitted in the annular groove.

The connecting pipe (3) is connected by a stopper (27) when inserted into the tubular portion (17), and the stopper (27) is fixed by a stopper holder (28).
The two stoppers (27) have the same shape but differ in the vertical direction and the diameter. Hereinafter, the upper stopper (27) will be described.

The stopper (27) is formed so as to be wider in the axial direction than the hole (17a) of the cylindrical portion (17). The holding portion (27a) has a C-shaped cross section and the inner periphery of the holding portion (27a). Two holes
(17a) Two arc-shaped fitting portions (27b) formed to project inward corresponding to (17a) and two formed grooves extending in the circumferential direction on the outer periphery of the portion where the fitting portions (27b) are formed It has a recess (29). The stopper holder (28) is made of an elastic material, and has a cylindrical shape that can cover the entire stopper (27).

The inside diameter of the fitting member (21) is equal to the outside diameter of the portion of the connecting pipe (3) in front of the annular projection (3a), and the annular projection (3a) is received by the step (20). , Step
Connect pipe (3) to fitting member (21) located in front of (20).
The part in front of the annular projection (3a) is inserted.

The end of the arc-shaped portion fitting portion (27b) of the stopper (27) extends slightly above or below both ends of the holding portion (27a). The width of the arc-shaped fitting portion (27b) is substantially equal to that of the hole (17a). On the inner surface of the stopper holder (28), four inner concave portions (31) to be fitted into the respective groove-shaped concave portions (29) are formed symmetrically. The front surface of the groove-shaped concave portion (29) is formed as a front inclined surface, and the rear surface is formed as a vertical surface.

The inner concave portion (31) has a claw shape and is formed by cutting and raising the peripheral wall of the stopper holder (28) obliquely forward. The inclination angle of the forward inclined surface is set to the groove-shaped concave portion (29). Equal to that of the forward slope. The rear surface of the inner concave portion (31) is vertical.

The inner diameter of the stopper holder (28) is
It is almost equal to the outer diameter of the holding portion (27a) of 7). Four sets of front and rear thin portions extending in the axial direction from both edges of the stopper holder (28) to the middle between the two are formed at equal intervals at positions separated from the inner concave portion (31) in the circumferential direction. The front thin portion is longer than the rear thin portion and is arranged alternately with the inner concave portion (31). When the stopper holder (28) is fixed so as to cover the stopper (27) and the connecting pipe (3) is inserted into the cylindrical portion (17),
Four projections (32) extending inward from the outer edge of the annular projection (3a) of the connection pipe (3) from the rear end of the stopper holder (28) are formed at equal intervals on the stopper holder (28).

The block (1) and the connection pipe (3) are connected as follows. The stopper holder (28) is incorporated in the connecting pipe (3) in advance, and is located behind the annular projection (3a) before being attached.

First, the stopper (27) is mounted on the cylindrical portion (17). In this embodiment, a stopper (27) is fitted to the upper tubular portion (17) from above and to a lower tubular portion (17) from below. At this time, the holding portion (27a) of the stopper (27) extends along the outer peripheral surface of the cylindrical portion (17), and the arc-shaped fitting portion (27
b) is fitted into the hole (17a) in a radially inwardly projecting manner.

Next, the connecting pipe (3) is inserted into the cylindrical portion (17). At this time, the annular projection (3a) of the connection pipe (3) hits the arc-shaped fitting portion (27b) of the stopper (27). When the annular projection (3a) advances while contacting the arc-shaped insertion portion (27b), the two arc-shaped insertion portions (27b) gradually separate from each other against the elasticity of the stopper (27). Passes through the two arc-shaped fitting portions (27b) and is received by the step portion (20). At this time, the two arc-shaped fitting portions (27b) return to the original shape due to the elasticity of the stopper (27), and the annular projection (3a) is fixed between the step portion (20) and the two arc-shaped fitting portions (27b). Will be located.

Finally, the stopper holder (28) is
(27) Fit so that it covers the whole. In this expansion valve, a cylindrical fitting member fitted into each of the refrigerant flow paths (5) and (6)
(21) is made of aluminum and has a rectangular parallelepiped pipe connection member.
Since (2) is made of synthetic resin, the fitting member (21) and the refrigerant flow path
(5) Good sealing performance at the contact portion with (6) and low cost.

FIG. 3 shows an expansion valve with a pipe connection device according to a second embodiment of the present invention. In the following description, the same components and portions as those described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this expansion valve, the block (1) includes:
Two cylindrical connecting members (35) communicating with the refrigerant flow paths (5) and (6) are fixed, and the connecting pipe (3) is connected to the cylindrical connecting members (35).

In the block (1), a female screw (34) (fixing means) is formed at the rear end of the peripheral wall forming each of the refrigerant flow paths (5) and (6). The cylindrical connecting member (35) has a hole (3
5a) is formed so that the rear end is a pipe receiving portion (35c), and a step (35b) is formed at the front end in the receiving portion (35c).
Are formed. Further, a screw (fixing means) (35d) is formed at the front of the connecting member (35). In addition, male screw
(35d) An annular groove is formed in a portion further forward,
An O-ring (37) is fitted in this annular groove. Then, a cylindrical connecting member (35) is attached to each female thread (34) of the block (1).
Screw (35d) is screwed into each cylindrical connecting member.
(35) is fixed to block (1).

In the above expansion valve, the connecting pipe
The connection procedure between (3) and the connection member (35) is the same as that of the expansion valve of the first embodiment.

In the first and second embodiments, the stopper (27) is fitted from above and below. However, the direction in which the stopper (27) is fitted is not limited to above and below. Instead, they may be fitted from the right and left.

FIG. 4 shows an expansion valve with a pipe connection device according to a third embodiment of the present invention.

In this expansion valve, a connection pipe (3) is connected to a first refrigerant flow path (41) formed in a block (40). The first refrigerant flow path (41) includes a low-pressure refrigerant outflow path (41a) in the front-rear direction, a high-pressure refrigerant inflow path (41b) located below the low-pressure refrigerant outflow path (41a), and a low-pressure refrigerant outflow path. (41a) communicates with the high-pressure refrigerant inflow passage (41b), and comprises a vertical communication passage (41c) located coaxially with the temperature-sensitive cylinder insertion hole (42) and the valve stem insertion hole (49). .

A screw (45) is formed at the center of the high-pressure refrigerant inflow passage (41b) so as to be screwed to the adjusting screw (44). A vertical through hole (44a) is located at the center of the adjustment screw (44).
Are formed. The cross section of this through hole (44a) has a hexagonal shape and can be rotated by a hexagonal cross section bar spanner. A ball valve (48) that changes the opening of the communication passage (41c) above the female screw (45) in the high-pressure refrigerant inflow passage (41b),
An adjustment spring (49) for urging the ball valve (48) is provided, and the adjustment spring (4
9) is held by the adjusting screw (44).

In this expansion valve, a connection device is provided below the female screw (45). Hereinafter, this connection device will be described. Female thread (45) in high pressure refrigerant inflow passage (41b)
Below the step (47), the diameter is different from the step (47).
7) The upper part has a diameter substantially equal to the outer diameter of the connecting pipe (3) above the annular projection (3a). The step (4) in the lower part of the block (40), that is, in the high-pressure refrigerant inflow passage (41b)
The lower part around 7) is formed into a cylindrical shape, and this part is used as a pipe receiving portion (43). A circumferential hole in the receiving part (43)
(43a) are formed.

Also in this expansion valve, the procedure for connecting the connection pipe (3) is the same as that of the two expansion valves.
In the expansion valve block (40), a female screw (45) for screwing the adjustment screw (44) is formed in the high-pressure refrigerant inflow passage (41b). In addition, there is no need to separately provide a screw (5d) for communicating with the high-pressure refrigerant inflow passage (41b).

[0040]

According to the expansion valve of the present invention, a connecting device in which two connecting pipes are fixed and each connecting pipe communicates with each flow path of the block has two through holes in the front-rear direction. It comprises a rectangular parallelepiped pipe connecting member and two cylindrical fitting members fitted into the respective through holes in a forward protruding manner, and the pipe connecting member has two rear projecting cylindrical portions communicating with the respective through holes. The connecting member is screwed to the block in a state where the front end of each tubular fitting member is fitted in the rear end of each refrigerant flow path of the block, and each connecting pipe is connected to the rear end of each tubular portion. Internal threads are respectively formed at the rear ends of the peripheral walls that form the respective refrigerant flow paths in the block so that the connection devices are connected to the two cylindrical connection members so that the connection devices are inserted into the fitting members from the openings and fixed to the respective insertion members. And each connection member has a male thread Then, each male screw of each connection member is screwed to each female screw of the block, each connection member is fixed to the block, and each connection pipe is inserted into the connection member from the rear end opening of each connection member. The connecting pipe can be easily connected to the expansion valve, and the block and the connecting device can be manufactured separately, which makes the expansion valve with the pipe connecting device expensive. There is no.

Further, there is provided a block provided with a refrigerant flow passage through which the refrigerant flowing into the evaporator flows, and a connection device for fixing the connection pipe and connecting the connection pipe to the refrigerant flow passage of the block. In the expansion valve with a pipe connection device, the refrigerant flow path, the high-pressure refrigerant inflow path in the vertical direction, the low-pressure refrigerant outflow path in the front-rear direction located above the high-pressure refrigerant inflow path, the inflow path and the outflow path The connecting device is formed integrally with the block around the lower part of the high-pressure refrigerant inflow passage, and a female screw is formed above the connection device of the high-pressure refrigerant inflow passage to form a high-pressure refrigerant inflow. A valve body for changing the opening of the communication passage and an adjusting spring for urging the valve body are arranged above the female screw in the path, and the adjusting screw for holding the adjusting spring is screwed to the female screw, and the refrigerant is attached to the adjusting screw. Form a through hole for passage Therefore, it is necessary to provide a connecting device at a portion of the block below the female thread, which is usually used as a cutting margin, to easily connect a connecting pipe to the expansion valve, and to provide a new cutting margin for the connecting device. Therefore, the expansion valve with the pipe connection device does not become expensive.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an expansion valve according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the expansion valve.

FIG. 3 is a sectional view of an expansion valve according to a second embodiment of the present invention.

FIG. 4 is a sectional view of an expansion valve according to a third embodiment of the present invention.

[Explanation of symbols]

 (1) Block (2) Rectangular pipe connection member (3) Connection pipe (5) First refrigerant flow path (6) Second refrigerant flow path (17) Rearward projecting cylindrical part (18) Through hole (21) Tube Shape fitting member (34) Fixing means (female thread) (35) Cylindrical connecting member (35d) Fixing means (male thread) (40) Block (41) Refrigerant flow path (41b) High-pressure refrigerant inflow path (41a) Low-pressure refrigerant Outflow path (41c) Communication path (44) Adjustment screw (44a) Refrigerant passage through hole (45) Female thread (48) Valve (ball valve) (49) Adjustment spring

Claims (3)

[Claims] 1. A block in which a first refrigerant flow path through which refrigerant flowing into an evaporator flows and a second refrigerant flow path through which refrigerant flowing out of the evaporator flows are formed, and two blocks are provided. An expansion valve with a pipe connection device having a connection device that fixes a pipe and connects each connection pipe to each flow path of a block, wherein the connection device has two rectangular through-holes in a front-rear direction. A connecting member, comprising two tubular fitting members fitted into the respective through holes in a forward protruding manner, and the pipe connecting member is provided with two rear projecting tubular portions communicating with the respective through holes, In a state where the front end of each tubular fitting member is fitted into the rear end of each refrigerant flow path of the block, the connecting member is fixed to the block, and each connecting pipe is fitted from the rear end opening of each tubular portion to the fitting member. To be inserted and fixed respectively Pipe connection device with expansion valve have been made. 2. A block in which a first refrigerant flow path through which the refrigerant flowing into the evaporator flows and a second refrigerant flow path through which the refrigerant flowing out from the evaporator flows are formed, and two blocks are provided. An expansion valve with a pipe connection device having a connection device for connecting each connection pipe to each flow path of the block by fixing the pipe, wherein each connection device is fixed to the block by a fixing means and each refrigerant flow path is provided. Expansion valve with a pipe connecting device, comprising two cylindrical connecting members connected to the connecting member, wherein each connecting pipe is inserted and fixed into the connecting member from a rear end opening of each connecting member. . 3. A block provided with a coolant flow path through which a coolant flowing into the evaporator flows, and a connection device fixed to the connection pipe and connecting the connection pipe to the coolant flow path of the block. An expansion valve with a pipe connection device, wherein a refrigerant flow path communicates a low-pressure refrigerant outflow path in a front-rear direction, a high-pressure refrigerant inflow path in a vertical direction located below a low-pressure refrigerant outflow path, and an inflow path and an outflow path. The connecting device is formed integrally with the block around the lower part of the high-pressure refrigerant inflow passage, and an internal thread is formed above the connection device of the high-pressure refrigerant inflow passage, and the connection device is formed in the high-pressure refrigerant inflow passage. Above the female screw, a valve element for changing the opening of the communication passage, an adjusting spring for urging the valve element are arranged, an adjusting screw for holding the adjusting spring is screwed to the female screw, and a refrigerant passing through the adjusting screw. A through hole is formed Pipe connecting device with an expansion valve that.