CN108916498B - Connecting structure of R744 air conditioner pipe and conversion connecting assembly - Google Patents

Abstract

The invention discloses a connection structure of an R744 air-conditioning pipe and a conversion connection assembly, comprising an R744 air-conditioning pipe and a conversion and connection assembly. The R744 air-conditioning pipe is sequentially composed of a barrier layer, a first rubber layer, a reinforcing layer and a second rubber layer from inside to outside. The conversion connection assembly includes a connection head, a conversion connection pipe, and an outer sleeve, one end of the connection head is fixedly connected with one end of the barrier layer, and the conversion connection pipe is composed of a socket part and a pipe connection part, and the socket part is arranged in the On the connecting head, after the outer sleeve is arranged on the second rubber layer and the sleeve part, the outer sleeve is fixed with the second rubber layer and the sleeve part; The inner peripheral surface of the socket part is provided with a boss corresponding to the assembling groove. After the boss on the socket part is fitted into the assembling groove under the withholding force, the socket part and the connector are fixed. into one. The present invention can prevent the occurrence of bulging on the air-conditioning pipe.

Description

Connection structure of R744 air-conditioning pipe and conversion connection assembly

technical field

The invention relates to an R744 air-conditioning pipe, in particular to a connection structure of the R744 air-conditioning pipe and a conversion connection assembly.

Background technique

At present, with the rapid development of new energy vehicles, the refrigerant working medium in automobile air conditioners is also rapidly updated. As a natural working medium, R744 does not destroy the ozone layer, and the global warming potential GWP is 1. However, with the change of the working medium, the components in the air conditioning system have changed, and the performance requirements of the air conditioning pipes and connecting structures have also changed. The existing R744 air-conditioning pipe is composed of a barrier layer, a first rubber layer, a reinforcing layer and a second rubber layer from the inside to the outside, but the R744 air-conditioning pipe needs to be connected with the compressor. Therefore, a conversion connection needs to be installed on the R744 air-conditioning pipe components.

Publication No. CN108317343A discloses an R744 air-conditioning pipe connection structure, including a conversion joint, a steel sleeve and a core pipe arranged inside the air-conditioning pipe, the outer diameter of the core pipe is consistent with the inner diameter of the barrier layer, and the One end of the conversion joint is provided with a connecting part for matching with the air-conditioning pipe, and the connecting part is embedded between the barrier layer of the air-conditioning pipe and the first rubber layer; the steel sleeve is sleeved on the air-conditioning pipe and the air-conditioning pipe. At the connection of the outer wall of the conversion joint, the conversion joint is connected with the steel sleeve through a clamping structure.

For the air-conditioning pipe of the above structure, one end of the connecting head is fixedly connected with the internal barrier layer of the air-conditioning pipe, and the outer circle of the other end of the connecting head is matched with the inner hole of the conversion joint, and the conversion joint is connected with the compressor. When the gas in the tube expands, the expanding gas will push the connector to move to the right along the axial direction in the air conditioner. When the connector is displaced, the connector will exert a pressing force on the barrier layer, which will cause the barrier layer to compress and deform, and the barrier layer The inner diameter of the air conditioner pipe becomes larger, and the restriction of the core tube on the barrier layer causes the barrier layer to deform only along the outside of the air conditioning pipe, and a bulge occurs on the air conditioning pipe.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a connection structure between the R744 air-conditioning pipe and the conversion connecting assembly, and the present invention can prevent the occurrence of bulging on the air-conditioning pipe.

The technical solutions to solve the above technical problems are as follows:

A connection structure of an R744 air-conditioning pipe and a conversion connection assembly, comprising an R744 air-conditioning pipe and a conversion and connection assembly, and the R744 air-conditioning pipe is sequentially composed of a barrier layer, a first rubber layer, a reinforcing layer and a second rubber layer from the inside to the outside;

The conversion connection assembly includes a connection head, a conversion connection pipe, and an outer sleeve. One end of the connection head is fixedly connected to one end of the barrier layer. The conversion connection pipe is composed of a socket part and a pipe connection part, and the socket part is arranged in the On the connecting head, after the outer sleeve is arranged on the second rubber layer and the sleeve part, the outer sleeve is fixed with the second rubber layer and the sleeve part; The inner peripheral surface of the connecting portion is provided with a boss corresponding to the assembling groove, and after the boss on the socket portion is fitted into the assembling groove under the withholding force, the socket portion and the connecting head are fixed in a solid state. one.

An air flow blocking member is arranged on the inner peripheral surface of the conversion connecting pipe. After the other end of the connecting head is matched with the air flow blocking member, the other end of the connecting head is blocked by the air flow along the direction parallel to the axial direction of the conversion connecting pipe. Parts occluded.

The other end of the connecting head abuts one end of the blocking member.

An installation groove is provided on the outer peripheral surface of the sleeve, and one end of the outer sleeve is provided with a protrusion extending along the inner side of the outer sleeve. The protrusion fits into the installation groove under the withholding force, so that the outer sleeve and the sleeve are tightly connected Solid as one.

Teeth are arranged on the inner wall surface of the outer sleeve, and the teeth on the inner wall surface of the outer sleeve are buckled into the second rubber layer under the withholding force.

The advantage of the present invention is that: the inner peripheral surface of the socket part is provided with a boss corresponding to the assembling groove, and after the boss on the socket part is fitted into the assembling groove under the withholding force, The socket part and the connecting head are fixed into one body. Since the connecting head and the conversion connecting pipe are fastened into one body, the sleeve is fixed to the second rubber layer through the outer sleeve. When the expansion force generated by the airflow acts on the connecting head, the connecting head drives the conversion connecting pipe, the outer sleeve and the air conditioner. The pipe moves as a whole, so there is no relative movement between any two parts in the connection head, the conversion connection pipe, the outer sleeve and the whole of the air conditioning pipe. Therefore, it is avoided that the connection head compresses and deforms the barrier layer, and bulges appear on the air-conditioning pipe.

Description of drawings

Fig. 1 is the schematic diagram of the connection structure of the R744 air-conditioning pipe and the conversion connection assembly of the present invention;

Fig. 2 is the schematic diagram of the connector in the present invention;

Fig. 3 is the schematic diagram of the conversion connecting pipe in the present invention;

Fig. 4 is the schematic diagram that the connection head and the barrier layer are installed;

Fig. 5 is the schematic diagram of connecting the connecting pipe and the conversion connecting pipe;

Fig. 6 is the schematic diagram when the conversion connecting pipe and the outer sleeve are crimped with the first rubber layer;

1 is the barrier layer, 2 is the first rubber layer, 3 is the reinforcement layer, 4 is the second rubber layer, 4a is the extension, 5 is the connector, 5a is the assembly groove, 5b is the thin-walled extension, and 5c is the annular groove , 6 is the conversion connecting pipe, 6a is the socket part, 6b is the pipe connection part, 6c is the boss, 6d is the airflow blocking part, 6e is the installation groove, 7 is the outer sleeve, 7a is the protrusion, 7b is the tooth, 8 In order to accommodate the gap, 9 is a connecting pipe, and 10 is a sealing ring.

Detailed ways

As shown in FIG. 1, the connection structure of the R744 air-conditioning pipe and the conversion connection assembly of the present invention includes the R744 air-conditioning pipe and the conversion connection assembly, and each part is described in detail below:

As shown in Figure 1, the R744 air-conditioning pipe is sequentially composed of a barrier layer 1, a first rubber layer 2, a reinforcing layer 3 and a second rubber layer 4 from the inside to the outside; the barrier layer 1 is a corrugated pipe, and the reinforcing layer 3 is woven by , and the reinforcing layer 3 is preferably woven with aromatic thread.

As shown in FIGS. 1 to 3 , the conversion connection assembly includes a connection head 5 , a conversion connection pipe 6 , and an outer sleeve 7 . One end of the connection head 5 is fixedly connected to one end of the barrier layer 1 , and one end of the connection head 5 is provided along the connection The thin-walled extension part 5b extending axially of the head, the outer diameter of the thin-walled extension part 5b is smaller than the outer diameter of the connecting head 5 , the thin-walled extension part 5b is inserted into the barrier layer 1 and cooperates with the barrier layer 1 .

The conversion connecting pipe 6 is composed of a socket part 6a and a pipe connection part 6b (as shown in FIG. 2 ). After the connecting portion 6a is attached, the outer sleeve 7 is fixed to the second rubber layer 4 and the sleeve connecting portion 6a. The connection portion 6b is used for attaching the connection pipe 9 .

As shown in FIG. 1 to FIG. 3 , the connecting head 5 is fixed with the socket part 6a, and the preferred way of fixing the connecting head 5 and the socket part 6a is as follows: the peripheral surface of the connecting head 5 is provided with an assembly groove 5a, and the The inner peripheral surface of the socket part 6a is provided with a boss 6c corresponding to the assembling groove. After the boss 6c on the socket part 6a is fitted into the assembling groove 5a under the withholding force, the socket is assembled. The portion 6a is fixed integrally with the connector 5 . An annular groove is also provided on the peripheral surface of the connecting head 5, and a sealing ring 10 is installed in the annular groove.

As shown in FIGS. 1 to 3 , the assembling groove 5a is composed of a first tapered surface and a second tapered surface. The first tapered surface and the second tapered surface are preferentially arranged to be non-parallel to the radial direction of the connector 5 , and the first tapered surface One end of the first conical surface and one end of the second conical surface intersect, and the other end of the first conical surface and the other end of the second conical surface extend to the peripheral surface of the connecting head 5 . The original shape of the boss 6c is a rectangle, but after the withholding force makes the boss 6c fit into the fitting groove 5a, the boss 6c is deformed into a shape that matches the fitting groove 5a, preferably, the boss After the deformation of 6c, the cross-section of the boss 6c is preferentially formed into a sawtooth shape. The fitting groove 5a is preferably provided as an annular groove.

As shown in FIG. 1 to FIG. 3 , an airflow blocking member 6d is provided on the inner peripheral surface of the conversion connecting pipe 6 . In the direction parallel to the axial direction, the other end of the connector 5 is blocked by the airflow blocking member 6d. The other end of the connecting head abuts one end of the blocking member. Since the other end of the connector 5 is blocked by the airflow blocking member 6d, when the airflow in the pipe expands, the expansion force generated by the airflow is blocked by the airflow blocking member 6d and cannot directly act on the axial end face of the connector 5. When the airflow expands, no axial force is applied to the connecting head, so that the axial displacement of the connecting head 5 is avoided.

In addition, due to the existence of the airflow blocking member 6d, when the connecting head 5 and the connecting pipe 9 are installed, when the connecting head 5 is abutted against the airflow blocking member 6d, and the connecting pipe 9 is abutted against the airflow blocking member 6d, the connection is directly determined. The installation size between the head 5 and the connection pipe 9 and the conversion connection pipe 6, regardless of the specific length that the connection pipe 9 needs to protrude into the conversion connection pipe 6, is a suitable installation size, or the connection head 5 extends into the conversion connection. The specific length within the tube 6 is the appropriate installation size.

As shown in FIG. 1 to FIG. 3 , a mounting groove 6e is provided on the outer peripheral surface of the socket part 6a, and one end of the outer sleeve 7 is provided with a protrusion 7a extending along the inner side of the outer sleeve 7, and the protrusion is raised under the withholding force 7a is fitted into the mounting groove, so that the outer sleeve 7 is fastened integrally with the socket portion 6a.

As shown in FIGS. 1 to 3 , teeth 7 b are provided on the inner wall surface of the outer sleeve 7 , and the teeth 7 b on the inner wall surface of the outer sleeve 7 are buckled into the second rubber layer 4 under the withholding force. Before the outer sleeve 7 and the second rubber layer 4 are crimped, a receiving gap 8 is left between the outer sleeve 7 and the socket part 6a, and an extension part 4a is formed at one end of the second rubber layer 4, and the extension part 4a is filled into the outer sleeve In the storage gap 8 between the tube 7 and the socket part 6a.

As shown in FIG. 1 to FIG. 3 , the preferred method for forming the extended portion 4 a is: when the teeth 7 b of the outer sleeve 7 are buckled into the second rubber layer 4 , the outer sleeve 7 is not affected by the second rubber layer 4 . The extrusion force is formed to deform the second rubber layer 4, and then the second rubber layer 4 forms an extension portion 4a, and the extension portion 4a is filled into the storage gap 8. In this way, the extension portion 4a is in the outer sleeve 7 and the first. A sealing effect is formed between the second rubber layer 4 and the socket part 6a, therefore, in this way, there is no need to provide an additional sealing ring between the socket part 6a and the outer sleeve 7. In addition, the extension portion 4a is pressed between the socket portion 6a and the outer sleeve 7 , and the extension portion 4a has better sealing performance than installing a sealing ring between the socket portion 6a and the outer sleeve 7 .

As shown in FIG. 4 , insert the thin-walled extension 5b on the connector 5 into the barrier layer 1 and cooperate with the barrier layer 1 in an interference fit. The sealing ring 10 is fitted into the annular groove 5c.

As shown in FIG. 5 , the connecting pipe 9 is inserted into the pipe connecting portion 6b of the conversion connecting pipe, and the connecting pipe 9 is limited by the airflow blocking member. Therefore, the insertion of the connecting pipe 9 into the connecting portion 6b can be restricted by the airflow blocking member. size, and the connecting pipe 9 and the pipe connecting part 6b are welded and fixed.

As shown in FIG. 6 , put the fixed connecting pipe 9 shown in FIG. 5 and the socket part 6a of the conversion connecting pipe 6 on the connecting head 5; put the outer sleeve 7 on the socket part 6a and the second rubber layer 4. , the conversion connecting pipe 6 and the outer casing 7 are crimped by a crimping tool, so that the boss 6c on the conversion connecting pipe 6 is fitted into the 5a assembly groove, the protrusion 7a on the outer casing 7 is fitted into the installation groove 6e, and the outer casing is fitted into the installation groove 6e. The tube 7 exerts a pressing force on the second rubber layer 4 to deform the second rubber layer 4, thereby causing the second rubber layer 4 to form an extension portion 4a, and the extension portion 4a is filled into the storage gap 8 (as shown in FIG. 1 ). shown).

Claims (5)

1. A connecting structure of an R744 air-conditioning pipe and a conversion connecting assembly comprises the R744 air-conditioning pipe and the conversion connecting assembly, wherein the R744 air-conditioning pipe is sequentially provided with a barrier layer, a first rubber layer, a reinforcing layer and a second rubber layer from inside to outside;

the conversion connecting component comprises a connector, a conversion connecting pipe and an outer sleeve, one end of the connector is fixedly connected with one end of the barrier layer, the conversion connecting pipe consists of a sleeve joint part and a pipeline connecting part, the sleeve joint part is arranged on the connector, the outer sleeve is arranged on the second rubber layer and the sleeve joint part, and then the outer sleeve is fixed with the second rubber layer and the sleeve joint part,

the circumferential surface of the connector is provided with an assembly groove, the inner circumferential surface of the sleeve joint part is provided with a boss corresponding to the assembly groove, and the sleeve joint part and the connector are fixed into a whole after the boss on the sleeve joint part is matched into the assembly groove under the buckling action force;

the inner circumferential surface of the conversion connecting pipe is provided with an airflow blocking part, and the other end of the connector is blocked by the airflow blocking part along the direction parallel to the axial direction of the conversion connecting pipe after being matched with the airflow blocking part.

2. A connection structure of an R744 air conditioning duct and the conversion connection assembly as claimed in claim 1, wherein the other end of the connection head abuts against one end of the blocking member.

3. A connection structure of an R744 air-conditioning duct and a conversion connection assembly as claimed in claim 1, wherein the outer circumference of the socket portion is provided with a mounting groove, one end of the outer sleeve is provided with a protrusion extending along the inner side of the outer sleeve, and the protrusion is fitted into the mounting groove under the fastening force, so that the outer sleeve and the socket portion are fastened into a whole.

4. A connection structure of an R744 air-conditioning duct and a conversion connection assembly as claimed in claim 1, wherein the inner wall surface of the outer sleeve is provided with teeth, and the teeth on the inner wall surface of the outer sleeve are buckled into the second rubber layer under a buckling force.

5. A connection structure of an R744 air-conditioning duct and a conversion connection component as claimed in claim 4, wherein a receiving gap is left between the outer sleeve and the socket part before the outer sleeve and the second rubber layer are buckled;

one end of the second rubber layer is provided with an extension part which is filled in the receiving gap between the outer sleeve and the sleeve joint part.

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